123 results on '"M. Keese"'
Search Results
2. Acute GI bleeding by multiple jejunal gastrointestinal autonomic nerve tumour associated with neurofibromatosis type I Urgencia quirúrgica por sangrado intestinal debido a tumor intestinal de nervios autónomos asociados a neurofibromatosis tipo I
- Author
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M. Keese, T. Riester, K. Schwenke, D. Dinter, W. Back, and P. Palma
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Tumor gastrointestinal de nervios autónomos ,Enfermedad de von Recklinghausen ,Tumores estromales ,Sangrado gastrointestinal ,Gastrointestinal autonomic nerve tumours ,von Recklinghausen's disease ,Stromal tumors ,Gastrointestinal bleeding ,Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
We describe a surgical emergency due to GI-bleeding caused by gastrointestinal autonomic nerve tumours (GANT's) in a patient with von Recklinghausen's disease. A 72 year old female patient with von Recklinghausen's disease was admitted with maelena. Endoscopy showed no active bleeding in the stomach and the colon. Therefore an angio-CT-scan was performed which revealed masses of the proximal jejunum as source of bleeding. Laparotomy was indicated and a 20 cm segment of jejunum which carried multiple extraluminal tumours was resected. The source of the bleeding was a 2 cm tumour which had eroded the mucosal surface. Immunohistologically, evidence of neuronal differentiation could be shown in the spindle-formed cells with positive staining for C-Kit (CD 117), CD 34, and a locally positive staining for synaptophysine and S100. This case report illustrates the association between neurofibromatosis and stromal tumours and should alert surgeons and gastroenterologist about gastrointestinal manifestations in patients with von Recklinghausen's disease.Se describe una urgencia quirúrgica por sangrado intestinal debido a tumor gastrointestinal de nervios autónomos (GANT) asociado a enfermedad de von Recklinghausen. Una mujer de 72 años con neurofibromatosis fue ingresada con signos de melena. La endoscopia digestiva alta y baja fue negativa. Se indicó TAC con contraste que advirtió tumores yeyunales como causa del sangrado. Se realizó laparotomía y resección de un segmento de 20 cm de yeyuno que incluía varios tumores. La causa del sangrado activo fue lesión en mucosa intestinal por erosión tumoral. El análisis por inmunohistoquímica de la pieza mostró diferenciación neuronal, con células fusiformes con tinción positiva para el C-Kit (CD 117), CD 34. Esta nota clínica pone de manifiesto la asociación entre la neurofibromatosis y los tumores estromales y debe alertar a gastroenterólogos y cirujanos sobre las posibles manifestaciones intestinales en pacientes con enfermedad de von Recklinghausen.
- Published
- 2007
3. L.0: A Language for Modeling and Prototyping Communications Software.
- Author
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E. Jane Cameron, David M. Cohen, Timothy M. Guinther, William M. Keese II, Linda A. Ness, Cynthia Norman, and Hassan N. Srinidhi
- Published
- 1990
4. Cervikales CUP-Adenokarzinom-Syndrom als interdisziplinäre Herausforderung mit zehn Fachdisziplinen
- Author
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E Seiz, C Faymonville, M Keese, Nicole Rotter, Ramon de Juan Rubio, Peter Hohenberger, S Weingärtner, Claudia Scherl, Jürgen Meinhardt, U Kneser, Stefan O. Schönberg, and Christoph Scharff
- Published
- 2021
5. Cervical CUP adenocarcinoma syndrome as an interdisciplinary challenge with ten specialist disciplines
- Author
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Peter Hohenberger, Stefan O. Schönberg, M Keese, Christoph Scharff, C Faymonville, E Seiz, Ramon de Juan Rubio, Jürgen Meinhardt, S Weingärtner, Nicole Rotter, Claudia Scherl, and U Kneser
- Subjects
medicine.medical_specialty ,business.industry ,General surgery ,Medicine ,Adenocarcinoma ,business ,medicine.disease - Published
- 2021
6. Poplitealarterienaneurysma
- Author
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G. Jung, Thomas Schmitz-Rixen, M. Keese, D. Gray, A. Gkremoutis, and Reinhart T. Grundmann
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medicine.medical_specialty ,business.industry ,Rare entity ,030204 cardiovascular system & hematology ,030230 surgery ,Dermatology ,Popliteal artery ,Pathogenesis ,03 medical and health sciences ,0302 clinical medicine ,medicine.artery ,Medicine ,Surgery ,Cardiology and Cardiovascular Medicine ,business - Published
- 2017
7. The Continuous Electron Beam Accelerator Facility at 12 GeV
- Author
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P. A. Adderley, S. Ahmed, T. Allison, R. Bachimanchi, K. Baggett, M. BastaniNejad, B. Bevins, M. Bevins, M. Bickley, R. M. Bodenstein, S. A. Bogacz, M. Bruker, A. Burrill, L. Cardman, J. Creel, Y.-C. Chao, G. Cheng, G. Ciovati, S. Chattopadhyay, J. Clark, W. A. Clemens, G. Croke, E. Daly, G. K. Davis, J. Delayen, S. U. De Silva, M. Diaz, R. Dickson, L. Doolittle, D. Douglas, M. Drury, E. Feldl, J. Fischer, A. Freyberger, V. Ganni, R. L. Geng, C. Ginsburg, J. Gomez, J. Grames, J. Gubeli, J. Guo, F. Hannon, J. Hansknecht, L. Harwood, J. Henry, C. Hernandez-Garcia, T. Hiatt, D. Higinbotham, S. Higgins, A. S. Hofler, J. Hogan, C. Hovater, A. Hutton, C. Jones, K. Jordan, M. Joyce, R. Kazimi, M. Keesee, M. J. Kelley, C. Keppel, A. Kimber, L. King, P. Kjeldsen, P. Kneisel, J. Kowal, G. A. Krafft, G. Lahti, T. Larrieu, R. Lauze, C. Leemann, R. Legg, R. Li, F. Lin, D. Machie, J. Mammosser, K. Macha, K. Mahoney, F. Marhauser, B. Mastracci, J. Matalevich, J. McCarter, M. McCaughan, L. Merminga, R. Michaud, V. Morozov, C. Mounts, J. Musson, R. Nelson, W. Oren, R. B. Overton, G. Palacios-Serrano, H.-K. Park, L. Phillips, S. Philip, F. Pilat, T. Plawski, M. Poelker, P. Powers, T. Powers, J. Preble, T. Reilly, R. Rimmer, C. Reece, H. Robertson, Y. Roblin, C. Rode, T. Satogata, D. J. Seidman, A. Seryi, A. Shabalina, I. Shin, C. Slominski, R. Slominski, M. Spata, D. Spell, J. Spradlin, M. Stirbet, M. L. Stutzman, S. Suhring, K. Surles-Law, R. Suleiman, C. Tennant, H. Tian, D. Turner, M. Tiefenback, O. Trofimova, A.-M. Valente, H. Wang, Y. Wang, K. White, C. Whitlatch, T. Whitlatch, M. Wiseman, M. J. Wissman, G. Wu, S. Yang, B. Yunn, S. Zhang, and Y. Zhang
- Subjects
Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
This review paper describes the energy-upgraded Continuous Electron Beam Accelerator Facility (CEBAF) accelerator. This superconducting linac has achieved 12 GeV beam energy by adding 11 new high-performance cryomodules containing 88 superconducting cavities that have operated cw at an average accelerating gradient of 20 MV/m. After reviewing the attributes and performance of the previous 6 GeV CEBAF accelerator, we discuss the upgraded CEBAF accelerator system in detail with particular attention paid to the new beam acceleration systems. In addition to doubling the acceleration in each linac, the upgrade included improving the beam recirculation magnets, adding more helium cooling capacity to allow the newly installed modules to run cold, adding a new experimental hall, and improving numerous other accelerator components. We review several of the techniques deployed to operate and analyze the accelerator performance and document system operating experience and performance. In the final portion of the document, we present much of the current planning regarding projects to improve accelerator performance and enhance operating margins, and our plans for ensuring CEBAF operates reliably into the future. For the benefit of potential users of CEBAF, the performance and quality measures for the beam delivered to each of the experimental halls are summarized in the Appendix.
- Published
- 2024
- Full Text
- View/download PDF
8. An Algorithm for the Translation of ALGOL Statements.
- Author
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W. M. Keese Jr. and Harry D. Huskey
- Published
- 1962
9. SurR regulates hydrogen production in Pyrococcus furiosus by a sulfur-dependent redox switch
- Author
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Bi-Cheng Wang, Gerrit J. Schut, Annette M. Keese, Michael Thomm, Robert A. Scott, Gina L. Lipscomb, Hua Yang, and Michael W. W. Adams
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Regulation of gene expression ,Hydrogenase ,biology ,Biochemistry ,Operon ,Transcription (biology) ,Pyrococcus furiosus ,Sulfur metabolism ,Transcriptional regulation ,biology.organism_classification ,Molecular Biology ,Microbiology ,Derepression - Abstract
We present structural and biochemical evidence for a redox switch in the archaeal transcriptional regulator SurR of Pyrococcus furiosus, a hyperthermophilic anaerobe. P. furiosus produces H(2) during fermentation, but undergoes a metabolic shift to produce H(2) S when elemental sulfur (S(0) ) becomes available. Changes in gene expression occur within minutes of S(0) addition, and the majority of these S(0) -responsive genes are regulatory targets of SurR, a key regulator involved in primary S(0) response. SurR was shown in vitro to have dual functionality, activating transcription of some of these genes, notably the hydrogenase operons, and repressing others, including a gene-encoding sulfur reductase. This work demonstrates via biochemical and structural evidence that the activity of SurR is modulated by cysteine residues in a CxxC motif that constitutes a redox switch. Oxidation of the switch with S(0) inhibits sequence-specific DNA binding by SurR, leading to deactivation of genes related to H(2) production and derepression of genes involved in S(0) metabolism.
- Published
- 2010
10. Genome-Wide Identification of Targets for the Archaeal Heat Shock Regulator Phr by Cell-Free Transcription of Genomic DNA
- Author
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Gerrit J. Schut, Michael Thomm, Annette M. Keese, Mohamed Ouhammouch, and Michael W. W. Adams
- Subjects
Hot Temperature ,Transcription, Genetic ,Archaeal Proteins ,DNA Mutational Analysis ,Molecular Sequence Data ,education ,Biology ,Regulon ,Microbiology ,Stress, Physiological ,Transcription (biology) ,Heat shock protein ,Consensus sequence ,Gene Regulation ,Heat shock ,Molecular Biology ,Gene ,Genetics ,Binding Sites ,Base Sequence ,Microarray Analysis ,biology.organism_classification ,Pyrococcus furiosus ,Repressor Proteins ,genomic DNA ,DNA, Archaeal ,Gene Expression Regulation, Archaeal ,Protein Binding - Abstract
The hyperthermophilic archaeon Pyrococcus furiosus grows optimally near 100°C and undergoes a heat shock response at 105°C, mediated at least in part by the heat shock regulator Phr. Genes encoding a small heat shock protein (HSP20) and a member of the AAA + ATPase are the only known targets of the regulator, but a genetic mutant of Phr has yet to be characterized. We describe here an alternative approach for the identification of the regulon of Phr based on cell-free transcription of fragmented chromosomal DNA in the presence or absence of the regulator and hybridization of in vitro RNA to P. furiosus whole-genome microarrays. Our results confirmed the phr , the hsp20 , and the aaa + ATPase genes as targets of Phr and also identified six additional open reading frames, PF0624, PF1042, PF1291, PF1292, PF1488, and PF1616, as Phr-responsive genes, which include that encoding di-myo-inositol phosphate synthase. Transcription of the identified novel genes was inhibited by Phr in standard transcription assays, and the novel consensus sequence 5′-TTTAnnnACnnnnnGTnAnnAAAA-3′ (uppercase letters denote a high conservation of the bases) was inferred from our data as the Phr recognition motif. Mutational evidence for the significance of this sequence as Phr recognition was provided in DNA-binding experiments.
- Published
- 2010
11. SurR: a transcriptional activator and repressor controlling hydrogen and elemental sulphur metabolism inPyrococcus furiosus
- Author
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Gerrit J. Schut, Michael Thomm, Michael W. W. Adams, Gina L. Lipscomb, Annette M. Keese, Robert A. Scott, and Darin M. Cowart
- Subjects
Transcriptional Activation ,Hydrogenase ,Transcription, Genetic ,Operon ,Archaeal Proteins ,DNA Footprinting ,Repressor ,DNA footprinting ,Electrophoretic Mobility Shift Assay ,Biology ,Microbiology ,Article ,Genes, Archaeal ,Open Reading Frames ,Genes, Regulator ,Cloning, Molecular ,Promoter Regions, Genetic ,Molecular Biology ,Activator (genetics) ,Promoter ,biology.organism_classification ,Molecular biology ,DNA-Binding Proteins ,Pyrococcus furiosus ,Response regulator ,DNA, Archaeal ,Gene Expression Regulation, Archaeal ,Sulfur ,Hydrogen ,Transcription Factors - Abstract
This work describes the identification and characterization of SurR, Pyrococcus furiosus sulphur (S(0)) response regulator. SurR was captured from cell extract using promoter DNA of a hydrogenase operon that is downregulated in the primary response of P. furiosus to S(0), as revealed by DNA microarray experiments. SurR was validated as a sequence-specific DNA binding protein, and characterization of the SurR DNA binding motif GTTn(3)AAC led to the identification of several target genes that contain an extended motif in their promoters. A number of these were validated to contain upstream SurR binding sites. These SurR targets strongly correspond with open reading frames and operons both up- and downregulated in the primary response to S(0). In vitro transcription revealed that SurR is an activator for its own gene as well as for two hydrogenase operons whose expression is downregulated during the primary S(0) response; it is also a repressor for two genes upregulated during the primary S(0) response, one of which encodes the primary S(0)-reducing enzyme NAD(P)H sulphur reductase. Herein we give evidence for the role of SurR in both mediating the primary response to S(0) and controlling hydrogen production in P. furiosus.
- Published
- 2009
12. Identification, quantification and comparison of major non-polar lipids in normal and dry eye tear lipidomes by electrospray tandem mass spectrometry
- Author
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Jean T. Jacob, Monica M. Keese, Bryan M. Ham, and Richard B. Cole
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Spectrometry, Mass, Electrospray Ionization ,Electrospray ,Glyceride ,Keratoconjunctivitis Sicca ,Lithium ,Tandem mass spectrometry ,Article ,Glycerides ,Diglycerides ,chemistry.chemical_compound ,Glycerol ,Animals ,Spectroscopy ,Chromatography ,Esters ,Monoglyceride ,Lipids ,eye diseases ,Terpenoid ,Wax ester ,Disease Models, Animal ,chemistry ,Tears ,Waxes ,Mass spectrum ,Female ,Rabbits - Abstract
Millions of individuals suffer from a health condition known as keratoconjunctivitis sicca (KCS, also known as 'dry eye'). Studies have indicated that the lipids in the tear film layer, which covers the outer portion of the eye, may be directly correlated with the existence of dry eye syndrome. By identifying and comparing the major, non-polar lipids in normal eye tears with a dry eye model, it may be possible to identify a symptom of, or a contributing factor to, dry eye. Electrospray tandem mass spectrometry (ES-MS/MS) was used to identify and compare the non-polar lipids, detected as lithium adducts, from normal and dry eye tear samples obtained from rabbits. A limited number of normal human tear samples were also examined for lipid content, and a close resemblance to rabbit was observed. Three distinct regions were delineated in the ES mass spectra of the non polar lipids, m/z 20-500, 500-800 and 800-1100. A common feature noted among identified lipid components was a glycerol backbone with fatty acyl substituents attached. Product ion spectra were obtained for lithiated monoacyl-, 1,2- and 1,3-diacyl- and triacylglyceride standards. Newly proposed structures and fragmentation pathways for the major product ions are presented for the 1,2- and 1,3-diglycerides, and also for the monoglyceride. New approaches to distinguishing asymmetric 1,2-diglycerides and 1,2- from 1,3-diglycerides are proposed. For the rabbit tear samples, the m/z 20-500 range contains monoester diols with empirical formulas C(n)H(2n)O(4), the m/z 500-800 range includes diesters with empirical formulas C(n)H(2n-2)O(5) and the m/z 800-1100 range contains triesters with empirical formulas C(n)H(2n-4)O(6). Also found in the extracts were three isoprene acetals (terpenoids).
- Published
- 2004
13. Platelets from flowing blood attach to the inflammatory chemokine CXCL16 expressed in the endothelium of the human vessel wall
- Author
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S. Meyer dos Santos, Nadejda Monsefi, K. Blankenbach, Bona Linke, Klaus Scholich, Sebastian Harder, Hans Deckmyn, M. Keese, Karen Nelson, A. Dörr, and Publica
- Subjects
Blood Platelets ,Carotid Artery Diseases ,Chemokine ,Endothelium ,Platelet Aggregation ,Abciximab ,chemistry.chemical_element ,030204 cardiovascular system & hematology ,Calcium ,In Vitro Techniques ,Ligands ,03 medical and health sciences ,Immunoglobulin Fab Fragments ,0302 clinical medicine ,Platelet Adhesiveness ,Von Willebrand factor ,von Willebrand Factor ,medicine ,Human Umbilical Vein Endothelial Cells ,Humans ,Platelet ,030212 general & internal medicine ,Platelet activation ,Calcium Signaling ,CXCL16 ,Receptors, CXCR6 ,Receptors, Scavenger ,Endarterectomy, Carotid ,biology ,Antibodies, Monoclonal ,Hematology ,Chemokine CXCL16 ,Plaque, Atherosclerotic ,Cell biology ,medicine.anatomical_structure ,Immobilized Proteins ,chemistry ,Platelet Glycoprotein GPIb-IX Complex ,Immunology ,Hemorheology ,biology.protein ,Receptors, Virus ,Receptors, Chemokine ,Endothelium, Vascular ,Chemokines, CXC ,Platelet factor 4 - Abstract
SummaryEndothelial chemokine CXC motif ligand 16 (CXCL16) expression is associated with atherosclerosis, while platelets, particularly those attaching to atherosclerotic plaque, contribute to all stages of athero-sclerotic disease. This investigation was designed to examine the role of CXCL16 in capturing platelets from flowing blood. CXCL16 was expressed in human atherosclerotic plaques, and lesion severity in human carotid endarterectomy specimens was positively correlated with CXCL16 levels. CXCL16 expression in plaques was co-localised with platelets deposited to the endothelium. Immobilised CXCL16 promoted CXCR6-dependent platelet adhesion to the human vessel wall, endothelial cells and von Willebrand factor during physiologic flow. At low shear, immobilised CXCL16 captured platelets from flowing blood. It also induced irreversible platelet aggregation and a rise in intra-platelet calcium levels. These results demonstrate that endothelial CXCL16’s action on platelets is not only limited to platelet activation, but that immobilised CXCL16 also acts as a potent novel platelet adhesion ligand, inducing platelet adhesion to the human vessel wall.
- Published
- 2014
14. Team-Time-Out – bevor es zu spät ist
- Author
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T. Schmitz-Rixen and M. Keese
- Abstract
Prozesse in Kliniken sind komplex und Fehler konnen zu fatalen Folgen fur den Patienten fuhren. Seit einigen Jahren wird die klinische Medizin transparenter; es wird offen diskutiert, dass in Krankenhausern und in Operationssalen auch unter Umstanden vermeidbare Fehler erfolgen. Der Eintritt von sogenannten „Adverse Events“, unerwunschten Ereignissen also, ist umso haufiger, je mehr Personen an den Behandlungsablaufen beteiligt sind. Je komplexer und interdisziplinarer die einzelnen Behandlungen strukturiert sind, desto groser wird die Verantwortung der Behandlungsfuhrer. Ihm obliegt es als Schnittstellenverantwortlichem, Fehler in diesen Ablaufen zu vermeiden. Zu den gravierendsten Fehlern gehoren hierbei Seiten-, Patienten- oder Prozedurenverwechslung.
- Published
- 2014
15. Imaging EGFR phosphorylation in intact human pancreatic carcinoma cells
- Author
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R, Magdeburg, M, Kessler, R, Boenninghoff, and M, Keese
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ErbB Receptors ,Pancreatic Neoplasms ,Base Sequence ,Cell Line, Tumor ,Fluorescence Resonance Energy Transfer ,Humans ,Enzyme-Linked Immunosorbent Assay ,Phosphorylation ,Real-Time Polymerase Chain Reaction ,DNA Primers - Abstract
Carcinoma of the pancreatic duct is a highly malignant tumor characterized by aggressive and early metastastatic growth. A high rate of tumor recurrence after surgical resection and the lack of effective chemotherapeutic approaches result in low 5-year survival rates. Overexpression of epidermal growth factor (EGF) and its receptor have been correlated to a higher tumor biological aggressiveness.We investigated EGFR RNA and protein expressions in different pancreatic carcinoma cell lines. EGFR phosphorylation was determined using acceptor photobleaching fluorescence resonance energy transfer (FRET).The imaging method allowed determination of receptor phorphorylation in intact cells without external calibration. Significant differences between the cell lines were found in EGFR expression but not in phosphorylation of EGFR without EGF stimulation. After stimulation with EGF, significant differences were found in receptor phorphorylation. EGFR expression did not correlate with EGFR phorphorylation.Since EGFR phosphorylation conveys signal transduction within cells, this molecular imaging method could be useful for the identification of patients with a high level of EGFR phosphorylation within tumor cells and, thus, to select patients for an EGFR-targeted therapy.
- Published
- 2012
16. Expression of selenium-containing proteins in human colon carcinoma tissue
- Author
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V, Yagublu, J R, Arthur, S N, Babayeva, F, Nicol, S, Post, and M, Keese
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Selenium ,Base Sequence ,Colonic Neoplasms ,Humans ,Enzyme-Linked Immunosorbent Assay ,Immunohistochemistry ,Polymerase Chain Reaction ,DNA Primers ,Neoplasm Proteins - Abstract
Selenium may be beneficial in reducing the risk of cancer incidence and mortality in many cancer types such as liver, prostate, colorectal and lung. However, despite the extensive recent research on selenium and selenium-containing proteins, there are still open questions concerning their expression in certain human cancer types, including colorectal carcinoma. Therefore, the expression level of the selenoproteins thioredoxin reductases 1 and 2 (TRXR-1 and TRXR-2) and glutathione peroxidases 1 and 4 (GPX1 and GPX4) in human colon carcinoma tissues was investigated. Up-regulation of TRXR-1 in the colon carcinoma specimens was found both in disease stage-dependent and independent analyses. No differences were found for TRXR-2 expression levels. GPX1 was up-regulated in carcinoma tissues at both the protein and mRNA levels. GPX4 was also up-regulated at the protein level, except for the samples derived from stage III patients. The expression of TRXR-1, GPX1 and GPX4, but not TRXR-2 is differently regulated in cancer as compared to healthy colonic tissue.
- Published
- 2011
17. [Complications of venous port systems : Radiological diagnostics and minimally invasive therapy]
- Author
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N, Rathmann, D, Hausmann, M, Kostrzewa, M, Keese, S, Diehl, S, Schönberg, and M, Sadick
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Male ,Catheterization, Central Venous ,Catheters, Indwelling ,Foreign-Body Migration ,Humans ,Minimally Invasive Surgical Procedures ,Female ,Middle Aged ,Radiography, Interventional - Abstract
Documentation of a correct port placement is a routine investigation in radiology. This article describes typical complications of port catheters and minimally invasive treatment options which can guarantee further use without complications.From January 2009 to May 2010 a surgical port placement was carried out on 174 patients at the University Clinic in Mannheim and of these, 52 patients were admitted to our institute for radiological imaging of the port. Minimally invasive treatment options are presented based on the observed port complications.Of the 52 patients 7 (13.5%) received a port catheter lysis. A successful port position correction was carried out in 3 (5.8%) patients with a malpositioned port catheter and port removal was recommended in 2 patients (3.8%) due to extensive arm venous thrombosis. A minimally invasive port catheter treatment allowed further use of the port system without operative revision in the corresponding patients. The measures were tolerated very well by the patients without postinterventional complications.
- Published
- 2011
18. 'Mastering Surgical Biology' – eine Retrospektive der 17. Forschungstage in Frankfurt
- Author
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D. Henrich and M. Keese
- Subjects
Surgical research ,medicine.medical_specialty ,business.industry ,General surgery ,Medicine ,Physiology ,Surgery ,Retrospective cohort study ,business ,Curriculum - Published
- 2014
19. Multimodal treatment of hepatocellular carcinoma (HCC)
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M. Keese and J. Sturm
- Subjects
Cancer Research ,medicine.medical_specialty ,Poor prognosis ,Cirrhosis ,Carcinoma, Hepatocellular ,Radiofrequency ablation ,Antineoplastic Agents ,Gastroenterology ,Risk Assessment ,law.invention ,law ,Internal medicine ,medicine ,Multimodal treatment ,Humans ,business.industry ,Liver Neoplasms ,Hematology ,medicine.disease ,Combined Modality Therapy ,Patient Care Management ,Transplantation ,Oncology ,Hepatocellular carcinoma ,Liver function ,business ,Median survival - Abstract
Screening of patients at risk for hepatocellular carcinomas (HCC) and preventive virustatic therapy are the first steps in a multimodal treatment concept, because delayed detection leads to a poor prognosis with median survival of
- Published
- 2004
20. Leberregeneration in der FGF2 defizienten Maus
- Author
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Jörg Sturm, Roderich Bönninghoff, H. Zhang, M. Keese, Till Hasenberg, R. Magdeburg, and S. Samel
- Abstract
Der basic Fibroblast Growth Factor (FGF2) spielt eine Schlusselrolle bei der Entwicklung der Leber. FGF2(- / -) Mause zeigten keine Verlangsamung der Regenerationsdynamik nach partieller Hepatektomie (PH). Hier untersuchen wir deshalb, ob andere Wachstumsfaktoren FGF2 funktionell substituieren und charakterisieren die Lebermorphologie der FGF2(- / -) Mause im Vergleich zu FGF2(+ / +) Tieren.
- Published
- 2003
21. Web distribution of diagnostic images requires new security efforts
- Author
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James M, Keese and Gary, Johnson
- Subjects
Health Insurance Portability and Accountability Act ,Systems Integration ,Computer Communication Networks ,Radiology Information Systems ,Humans ,Medical Record Linkage ,Computer Security ,Confidentiality ,United States - Published
- 2002
22. Building a secure home: protecting individually identifiable patient information
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J M, Keese
- Subjects
Health Insurance Portability and Accountability Act ,Inservice Training ,Medical Records Systems, Computerized ,Management Audit ,Guideline Adherence ,Computer Security ,Security Measures ,United States ,Information Systems - Published
- 2002
23. Leberregeneration nach Hemihepatektomie in der FGF2 defizienten Maus
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J. Sturm, S. Post, H. Zhang, N. Gretz, R. Bönninghoff, and M. Keese
- Subjects
Andrology ,chemistry.chemical_compound ,chemistry ,In vivo ,Apoptosis ,Regeneration (biology) ,Basic fibroblast growth factor ,Caspase 3 ,Northern blot ,Liver regeneration ,Liver mass - Abstract
Backround and Aims: To test the hypothesis that basic fibroblast growth factor (FGF2) is a key player in liver regeneration in vivo, we performed partial hepatectomy on FGF2-deficient ( - / - ) mice. As a control group we used the corresponding FGF2-competent mice. Method: Liver regeneration was studied at days 0, 1, 2, 4, 7 and 10 post partial hemihepatectomy. We measured different growth and apoptotic factors, wich are relevant for liver regeneration. The expression of HGF, VEGF, TGFα, Fas, Fas-L , Caspase 3, Bcl-2, Bcl-xL and Bax was compared by semiquantitative rt-PCR and non radioactive Northern Blot. Results: Postoperative liver mass was comparable in both groups. VEGF, Caspase-3 and Bcl-xL were shown to be differentially expressed in the two groups. No difference was found for HGF, TGFα, Fas, Fas-L, Bcl-2, and Bax. In conclusion, the role of FGF2 in regeneration, but not in apoptosis, might be substituted by VEGF.
- Published
- 2001
24. Videomikroskopie der bakteriellen Translokation in einem Ileus-Modell der Ratte
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S. Lanig, S. Samel, N. Gretz, J. Sturm, S. Post, M. Hafner, M. Keese, and M. Kleczka
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medicine.medical_specialty ,Chemistry ,Lumen (anatomy) ,Ileum ,Chromosomal translocation ,Gastroenterology ,Pathophysiology ,medicine.anatomical_structure ,In vivo ,Internal medicine ,Subserosa ,medicine ,Ligation ,Perfusion - Abstract
Background and Aims: In order to study the pathophysiology of bacterial translocation in vivo we developed a new animal model using videomicroscopy. Methods: Intestinal obstruction was simulated by ligation of a segment of ileum in Wistar rats. The ligated segment of bowel was either ischemic (group 1) or obtained the corresponding perfusion via mesenteric vessel (groups 2 and 3). Green fluorescent protein-transfected, vital E. coli in a watery suspension were injected into the obstructed lumen. The bowel segment was exposed beneath an optical window for videomicroscopy. Kinetics of BT and leukocyte-endothelial interaction are presented as median, mean and s.e.m. and were compared using Student’s t-Test (significant, p
- Published
- 2001
25. Systemmykosen bei Leukämiekranken: Caspofungin breit wirksam, gut verträglich und interaktionsarm
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A.A. Brandes, D. Lacombe, R. Felix, J. Bačovský, T. Büchler, R. Voltz, H.-J. Scholman, U. Keilholz, H. Amthauer, J. Ruf, W. Golder, R. Hájek, W. Küker, S. Diekamp, E. Thiel, M. Krejčí, A. Svobodník, J. Vorlíček, C.M. Zwaan, H. Jürgens, D. Reinhardt, W. Grisold, C. Corbacioglu, N. Guler, C. Granzow, R. Stupp, J.A. Werner, G. Kaspers, O. Ozkaya, M. Keese, P. Krebs, K. Altundag, G. Fleischhack, J.W. Sturm, U. Pelzer, H. Oettle, S. Yalcın, Z. Adam, M. Plotkin, G. Hütter, U. Creutzig, K. Indrák, A. Schmittel, W. Wick, F. Graus, J.L. Finlay, R. Dollner, P. Wust, A. Křivanová, V. Ščudla, M. Dworzak, J.E.A. Wolff, T. Steinmüller, A.S. Lübbe, M. J. van den Bent, K. Schulze, J. Mayer, and A. Dietz
- Subjects
Cancer Research ,Oncology ,Hematology - Published
- 2004
26. EGFR-Blockade mit Gefitinib. Erfolge beim NSCLC
- Author
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V. Ščudla, R. Hájek, M. Dworzak, U. Creutzig, J. Mayer, H.-J. Scholman, A.A. Brandes, D. Reinhardt, A. Svobodník, K. Altundag, K. Schulze, A.S. Lübbe, J.L. Finlay, P. Wust, E. Thiel, R. Dollner, M. Krejčí, G. Fleischhack, J.W. Sturm, U. Pelzer, W. Küker, C.M. Zwaan, Z. Adam, J.E.A. Wolff, S. Yalcın, A. Dietz, W. Grisold, M. Plotkin, C. Granzow, T. Büchler, J. Vorlíček, R. Stupp, J. Ruf, O. Ozkaya, A. Schmittel, M. J. van den Bent, A. Křivanová, U. Keilholz, G. Hütter, H. Jürgens, R. Felix, C. Corbacioglu, H. Oettle, J. Bačovský, N. Guler, G. Kaspers, P. Krebs, D. Lacombe, S. Diekamp, K. Indrák, W. Wick, F. Graus, W. Golder, T. Steinmüller, J.A. Werner, M. Keese, R. Voltz, and H. Amthauer
- Subjects
Cancer Research ,Oncology ,Hematology - Published
- 2004
27. The use of ES-MS/MASS Spectrometry to Identify and Compare the Major Non-Polar Lipids in Normal and Dry Eye Tears
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Richard B. Cole, Jean T. Jacob, Bryan M. Ham, and Monica M. Keese
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Ophthalmology ,Chromatography ,Chemistry ,Tears ,Non polar ,Mass spectrometry - Published
- 2005
28. Aktuelles rund um Imatinib
- Author
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J. Ruf, U. Keilholz, A. Svobodník, Z. Adam, D. Lacombe, A. Dietz, C.M. Zwaan, R. Felix, K. Altundag, K. Schulze, N. Guler, G. Kaspers, V. Ščudla, R. Hájek, M. Dworzak, H.-J. Scholman, P. Krebs, P. Wust, A.A. Brandes, S. Yalcın, J.L. Finlay, J. Bačovský, U. Creutzig, D. Reinhardt, M. Plotkin, G. Hütter, R. Dollner, W. Küker, M. J. van den Bent, S. Diekamp, C. Granzow, J. Mayer, W. Grisold, M. Krejčí, O. Ozkaya, R. Stupp, C. Corbacioglu, E. Thiel, W. Golder, J. Vorlíček, H. Jürgens, A.S. Lübbe, A. Schmittel, K. Indrák, R. Voltz, W. Wick, H. Amthauer, H. Oettle, F. Graus, T. Steinmüller, T. Büchler, J.A. Werner, M. Keese, A. Křivanová, G. Fleischhack, J.W. Sturm, U. Pelzer, and J.E.A. Wolff
- Subjects
Cancer Research ,Oncology ,Hematology - Published
- 2004
29. newscripts
- Author
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K. M. KEESE
- Subjects
General Medicine - Published
- 1998
30. Biosynthesis of four rat liver mitochondrial acyl-CoA dehydrogenases: In vitro synthesis, import into mitochondria, and processing of their precursors in a cell-free system and in cultured cells
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Susan M Keese, Wayne A. Fenton, Kay Tanaka, and Yasuyuki Ikeda
- Subjects
Enzyme Precursors ,Macromolecular Substances ,Biophysics ,Mitochondria, Liver ,Mitochondrion ,Biology ,Biochemistry ,Cell Line ,Substrate Specificity ,Cell-free system ,chemistry.chemical_compound ,Biosynthesis ,Reticulocyte ,medicine ,Animals ,Molecular Biology ,Acyl-CoA Dehydrogenase, Long-Chain ,Biological Transport ,Trypsin ,Cell Compartmentation ,Rats ,Molecular Weight ,Kinetics ,medicine.anatomical_structure ,chemistry ,Mitochondrial matrix ,Dinitrophenol ,Protein Processing, Post-Translational ,medicine.drug - Abstract
The synthesis, translocation, processing, and assembly of rat liver short chain acyl-CoA, medium chain acyl-CoA, long chain acyl-CoA, and isovaleryl-CoA dehydrogenases were studied. These four acyl-CoA dehydrogenases are homotetrameric flavoproteins which are located in the mitochondrial matrix. They were synthesized in a cell-free rabbit reticulocyte lysate system, programmed by rat liver polysomal RNA, as precursor polypeptides which are 2–4 kDa larger than their corresponding mature subunits (Mr 41,000–45,000). When the radiolabeled precursors were incubated with intact rat liver mitochondria, they appeared to bind tightly to the mitochondrial outer membrane. At this stage they were completely susceptible to the action of exogenous trypsin. The precursors bound to mitochondria at 0 °C were translocated into the mitochondria and processed when the temperature was raised to 30 °C. No reaction occurred when the temperature was kept at 0 °C, however, suggesting that the binding of the precursors is temperature independent while the subsequent steps of the pathway are energy dependent. Indeed, the translocation reaction was inhibited by compounds such as dinitrophenol and rhodamine 6G which inhibit mitochondrial energy metabolism. The newly imported (mature) enzymes were inaccessible to the proteolytic action of added trypsin. The processing of the precursors to mature subunits was proteolytically carried out in the mitochondrial matrix, and the processed mature subunits mostly assembled to their respective tetrameric forms. Newly synthesized larger precursors of each of the four acyl-CoA dehydrogenases were recovered from intact, cultured Buffalo rat liver cells in the presence of dinitrophenol. When dinitrophenol was removed in a pulse-chase protocol, the accumulated precursors were rapidly ( t 1 2 3–5 min ) converted to their corresponding mature subunits. On the other hand, when the chase was performed in the presence of the inhibitor, the labeled precursors disappeared with t 1 2 of >4 h for long chain acyl-CoA dehydrogenase and 1–2 h for the other three enzyme precursors.
- Published
- 1987
31. Molecular heterogeneity of variant isovaleryl-CoA dehydrogenase from cultured isovaleric acidemia fibroblasts
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Kay Tanaka, Susan M Keese, and Yasuyuki Ikeda
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Oxidoreductases Acting on CH-CH Group Donors ,Immunoprecipitation ,Nonsense mutation ,Mutant ,Biology ,chemistry.chemical_compound ,Hemiterpenes ,Methionine ,Valerates ,Humans ,Isovaleryl-CoA dehydrogenase ,Pentanoic Acids ,Amino Acid Metabolism, Inborn Errors ,Polyacrylamide gel electrophoresis ,Multidisciplinary ,Isovaleryl-CoA Dehydrogenase ,Genetic Carrier Screening ,Point mutation ,Genetic Variation ,Fibroblasts ,Isovaleric Acidemia ,Molecular biology ,Molecular Weight ,chemistry ,Biochemistry ,Electrophoresis, Polyacrylamide Gel ,Oxidoreductases ,Research Article - Abstract
Variants of isovaleryl-CoA dehydrogenase (IVDHase, EC 1.3.99.10) in 15 isovaleric acidemia fibroblast lines were analyzed using [35S]methionine labeling, immunoprecipitation with anti-rat IVDHase antiserum, and NaDodSo4/polyacrylamide gel electrophoresis. Five distinct variants of IVDHase were detected. The molecular size of variant 1 (43 kDa) was indistinguishable from that of normal IVDHase (43 kDa), although the activity of this enzyme was as deficient (0-2.2% of normal control) as that of any other variant. It was synthesized as a precursor (45 kDa), which is the case for normal IVDHase. Variant 2 was synthesized as a 42-kDa precursor, but only a small portion of it was processed to the mature variant form (40 kDa). Variant 3 (41 kDa) was synthesized as a 43-kDa precursor. Variant 4 (40 kDa) was synthesized as a 42-kDa precursor that was readily processed to the mature form. In cells with variant 5, no material that crossreacted with the anti-rat IVDHase antibody was detected. These results suggest that variant 1 may be due to a point mutation, while variants 2-4 may be encoded by a different mutant IVDHase allele that causes the premature termination of translation, although other complex mechanisms are possible. A deletion, a nonsense mutation close to the NH2 terminus or an extremely labile mRNA may give rise to variant 5.
- Published
- 1985
32. Case report-delayed splenic rupture in combination with medial femoral neck fracture after low energy trauma. Development of hemorrhagic shock 5days after hip prosthesis due to a rare cause
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Ingo Marzi, Maximilian Leiblein, M. Keese, D. Ullrich, N. Habbe, and Mark Lehnert
- Subjects
medicine.medical_specialty ,medicine.medical_treatment ,lcsh:Surgery ,Spleen ,Physical examination ,Critical Care and Intensive Care Medicine ,Prosthesis ,Article ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Orthopedics and Sports Medicine ,ddc:610 ,030216 legal & forensic medicine ,Femoral neck ,Anamnesis ,030222 orthopedics ,medicine.diagnostic_test ,business.industry ,lcsh:RD1-811 ,Emergency department ,medicine.disease ,Surgery ,Pneumonia ,medicine.anatomical_structure ,Hemorrhagic shock ,Emergency Medicine ,Radiology ,business - Abstract
A 79year old female patient was admitted to our emergency department with a fracture of the right medial femoral neck six days after a fall on her right side and a cemented hemiprosthesis was implanted. Five days later, she developed a hemorrhagic shock and was diagnosed with a delayed splenic rupture and the spleen was resected. Histopathological examination showed a delayed rupture of an otherwise normal spleen without signs of an underlying pathology. The outcome was fatal: In the postoperative course she developed pneumonia, three weeks later she succumbed due to multiple organ failure.Even careful reevaluation of the case did not provide any clues to expect an injury of the spleen according to trauma mechanism.This case shows that delayed splenic rupture of a normal spleen may occur even after a low energy trauma. Injury of the spleen should therefore always be considered, even with an uncharacteristic anamnesis. Physical examination after trauma should therefore always include a careful clinical evaluation. The clinical threshold for a FAST examination should be low.The coincidence of a femoral neck fracture and a splenic rupture after a low energy trauma has not been reported before.
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33. Biosynthesis of variant medium chain acyl-CoA dehydrogenase in cultured fibroblasts from patients with medium chain acyl-CoA dehydrogenase deficiency
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Paul M. Coates, Susan M Keese, Y Ikeda, Kay Tanaka, and Daniel E. Hale
- Subjects
Dehydrogenase ,Biology ,Acyl-CoA Dehydrogenase ,Cell Line ,chemistry.chemical_compound ,Biosynthesis ,Acyl-CoA Dehydrogenases ,Reference Values ,Animals ,Humans ,Cells, Cultured ,Skin ,Antiserum ,Gel electrophoresis ,Methionine ,nutritional and metabolic diseases ,Genetic Variation ,Medium-Chain Acyl-CoA Dehydrogenase Deficiency ,Fibroblasts ,Molecular biology ,Rats ,Molecular Weight ,chemistry ,Biochemistry ,Liver ,Cell culture ,Pediatrics, Perinatology and Child Health ,biology.protein ,Antibody - Abstract
We prepared monospecific antiserum in rabbits against medium chain acyl-CoA dehydrogenase (MCAD) purified from rat liver and studied the biosynthesis of MCAD in cultured skin fibroblasts from patients with MCAD deficiency using the antibody. Cells were incubated with [35S]methionine. The labeled MCAD was immunoprecipitated using the anti-rat MCAD antiserum and Staphylococcus aureus cells and then analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. We first demonstrated that antirat MCAD antibody cross-reacted specifically with human MCAD. In 13 MCAD-deficient cell lines tested, the residual MCAD activity ranged from 5–12% of the mean of normal controls, but the variant MCAD in all of these cells was indistinguishable from the normal human MCAD on the basis of molecular size, indicating that MCAD deficiency in all of these patients is most likely due to point mutation(s) in the MCAD gene.
- Published
- 1986
34. Biosynthesis of electron transfer flavoprotein in a cell-free system and in cultured human fibroblasts. Defect in the alpha subunit synthesis is a primary lesion in glutaric aciduria type II
- Author
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S M Keese, Y Ikeda, and K Tanaka
- Subjects
Electron-Transferring Flavoproteins ,Adipates ,Cycloheximide ,Electron-transferring flavoprotein ,Cell-free system ,Glutarates ,chemistry.chemical_compound ,Biosynthesis ,Animals ,G alpha subunit ,Methionine ,biology ,Cell-Free System ,Flavoproteins ,Rhodamines ,Glutaric aciduria ,General Medicine ,Fibroblasts ,Malonates ,Molecular Weight ,Cytosol ,chemistry ,Biochemistry ,biology.protein ,Electrophoresis, Polyacrylamide Gel ,Rabbits ,Protein Processing, Post-Translational ,Research Article ,Carbohydrate Metabolism, Inborn Errors - Abstract
We investigated the biosynthesis of electron transfer flavoprotein (ETF) in a cell-free system. Both alpha-(alpha-ETF, 32,000 molecular weight [mol wt]) and beta-subunits (beta-ETF, 27,000 mol wt) were nuclear-coded, and synthesized in the cytosol. alpha-ETF was synthesized as a precursor (p alpha-ETF), 3,000 mol wt larger than its mature counterpart, and was translocated into the mitochondria and processed to the mature alpha-ETF. The newly synthesized beta-ETF was the same as the mature beta-ETF. Using [35S]methionine labeling, we also studied the biosynthesis in cultured normal human fibroblasts. p alpha-ETF was detected when the cells were labeled in the presence of dinitrophenol or rhodamine 6G. Among six glutaric aciduria type II (GAII) and two ethylmalonic-adipic aciduria cell lines, defective p alpha-ETF synthesis was observed in three GAII cell lines, and beta-ETF synthesis was normal. In one of them, no p alpha-ETF was synthesized at all, while in another, a faint p alpha-ETF band of normal size was detected, and was efficiently processed. In the third line, alpha-EFT was 1,000 mol wt smaller than the normal counterpart, both as the precursor and as the mature form.
- Published
- 1986
35. 831 MOLECULAR HETEROGENEITY OF ELECTRON TRANSFER FLAVOPROTEIN (ETF) IN GLUTARIC ACIDURIA TYPE II DUE TO AN ETF DEFICIENCY
- Author
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Yasuyuki Ikeda, Susan M Keese, K Tanaka, and Yale Univ
- Subjects
Antiserum ,Methionine ,ATP synthase ,biology ,Immunoprecipitation ,Glutaric aciduria ,Flavoprotein ,chemistry.chemical_compound ,chemistry ,Biosynthesis ,Biochemistry ,Cell culture ,Pediatrics, Perinatology and Child Health ,biology.protein - Abstract
Glutaric aciduria type II (GAII) is due to a deficiency of either ETF or ETF dehydrogenase. We studied the biosynthesis of ETF in 10 GAII lines as well as in normal controls. Cells were labeled with [35S]methionine in the presence and absence of rhodamine 6G. Rhodamine 6G inhibits mitochondrial ATP synthesis, thereby inhibiting post-translational processing of the nuclear coded mitochondrial enzymes. The labeled human ETF was immunoprecipitated from the solubilized cells using the anti-rat ETF antiserum and Staph A cells and analyzed by SDS-PAGE. In normal cells, α-subunit is synthesized as a precursor (35 kd), 3 kd larger than the mature counterpart (32 kd), while β-subunit is synthesized in a size indistinguishable from that of the mature β-subunit (27 kd). ETF abnormality was found in three GAII lines. In two of them, α-subunit was synthesized either not at all or in an extremely small amount. The size of the precursor and mature forms of ETF were of the normal sizes. In contrast, α-subunit synthesized in the third GAII line was 1 kd smaller than the normal size, both as precursor and mature form. In all other 7 GAII lines, the synthesis of α-subunit were normal. These 7 cell lines are due to an ETF dehydrogenase deficiency. Abnormality of β-subunit was found in none of the cell lines tested.
- Published
- 1985
36. 830 MOLECULAR STUDY OF MUTANT MEDIUM CHAIN ACYL-CoA DEHYDROGENASE IN CULTURED FIBROBLASTS FROM PATIENTS WITH MEDIUM CHAIN ACYL-CoA DEHYDROGENASE DEFICIENCY
- Author
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Kay Tanaka, Paul M. Coates, Yasuyuki Ikeda, and Susan M Keese
- Subjects
chemistry.chemical_classification ,Antiserum ,Methionine ,Mutant ,nutritional and metabolic diseases ,Dehydrogenase ,Medium-Chain Acyl-CoA Dehydrogenase Deficiency ,Biology ,chemistry.chemical_compound ,Enzyme ,medicine.anatomical_structure ,chemistry ,Biochemistry ,Biosynthesis ,Pediatrics, Perinatology and Child Health ,medicine ,Fibroblast - Abstract
We prepared monospecific antiserum in rabbits against medium chain acyl-CoA dehydrogenase (MCAD) purified from rat liver, and studied the biosynthesis of MCAD in 10 cultured skin fibroblast lines from patients with inborn MCAD deficiency. Cells were incubated with [35S]methionine. The labeled MCAD was immunoprecipitated using the anti-MCAD antiserum and Staph A cells and analyzed by SDS-PAGE. We first demonstrated that anti-rat MCAD antibody cross reacted specifically with human MCAD. MCAD is 1-6 kd larger than four other acyl-CoA dehydrogenases such as isovaleryl-CoA- short chain-, long chain-, and 2-methyl-branched chain acyl-CoA dehydrogenases, and can be readily distinguished from other enzymes by its molecular size on slab SDS-PAGE. It is interesting to note that human MCAD is 1 kd larger than rat MCAD, while there were no differences in molecular size between other human acyl-CoA dehydrogenases and the rat counterparts. In all 10 MCAD deficient lines tested, the MCAD activity ranged from 6-13% of the mean of normal control, but the mutant MCAD in all of these cells were indistinguishable from the normal human MCAD on the basis of molecular size, indicating that all the mutant MCAD's are due to point mutation. This is in contrast to the extensive heterogeneity observed in isovaleryl-CoA dehvdrogenase in isovaleric acidemia cells.
- Published
- 1985
37. Microarray-based detection and expression analysis of drug resistance in an animal model of peritoneal metastasis from colon cancer.
- Author
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Yagublu V, Bayramov B, Reissfelder C, Hajibabazade J, Abdulrahimli S, and Keese M
- Subjects
- Animals, Mice, Apoptosis drug effects, Gene Expression Profiling, Fluorouracil pharmacology, Fluorouracil therapeutic use, Disease Models, Animal, Mice, Inbred BALB C, Humans, Cell Line, Tumor, Gene Expression Regulation, Neoplastic drug effects, Oligonucleotide Array Sequence Analysis, Peritoneal Neoplasms secondary, Peritoneal Neoplasms drug therapy, Peritoneal Neoplasms genetics, Drug Resistance, Neoplasm genetics, Colonic Neoplasms pathology, Colonic Neoplasms drug therapy, Colonic Neoplasms genetics
- Abstract
Chemotherapy drugs efficiently eradicate rapidly dividing differentiated cells by inducing cell death, but poorly target slowly dividing cells, including cancer stem cells and dormant cancer cells, in the later course of treatment. Prolonged exposure to chemotherapy results in a decrease in the proportion of apoptotic cells in the tumour mass. To investigate and characterize the molecular basis of this phenomenon, microarray-based expression analysis was performed to compare tHcred
2 -DEVD-EGFP-caspase 3-sensor transfected C-26 tumour cells that were harvested after engraftment into mice treated with or without 5-FU. Peritoneal metastasis was induced by intraperitoneal injection of C-26 cells, which were subsequently reisolated from omental metastatic tumours after the mice were sacrificed by the end of the 10th day after tumour injection. The purity of reisolated tHcred2-DEVD-EGFP-caspase 3-sensor-expressing C-26 cells was confirmed using FLIM, and total RNA was extracted for gene expression profiling. The validation of relative transcript levels was carried out via real-time semiquantitative RT‒PCR assays. Our results demonstrated that chemotherapy induced the differential expression of mediators of cancer cell dormancy and cell survival-related genes and downregulation of both intrinsic and extrinsic apoptotic signalling pathways. Despite the fact that some differentially expressed genes, such as BMP7 and Prss11, have not been thoroughly studied in the context of chemoresistance thus far, they might be potential candidates for future studies on overcoming drug resistance., (© 2024. The Author(s).)- Published
- 2024
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38. Prognostic value of extended cardiac risk assessment before elective open abdominal aortic surgery.
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Sigl M, Baumann S, Könemann AS, Keese M, Schwenke K, Gerken ALH, Dürschmied D, and Rosenkaimer S
- Subjects
- Humans, Male, Risk Assessment, Female, Aged, Prognosis, Germany epidemiology, Survival Rate, Postoperative Complications mortality, Preoperative Care methods, Reproducibility of Results, Treatment Outcome, Vascular Surgical Procedures adverse effects, Comorbidity, Sensitivity and Specificity, Risk Factors, Prevalence, Elective Surgical Procedures mortality, Aorta, Abdominal surgery, Aorta, Abdominal diagnostic imaging
- Abstract
Background: Major vascular surgery is associated with a high perioperative risk and significant mortality. Despite advances in risk stratification, monitoring, and management of perioperative complications, cardiac complications are still common. Stress echocardiography is well established in coronary artery disease diagnostics; however, its prognostic value before high-risk aortic surgery is unknown. This prospective, single-center study compared the outcome of patients undergoing extended cardiac risk assessment before open abdominal aortic surgery with the outcome of patients who had received standard preoperative assessment., Methods: The study included patients undergoing elective open abdominal aortic surgery. Patients who underwent standard preoperative assessment before the start of a dedicated protocol were compared with patients who had extended cardiac risk assessment, including dobutamine stress echocardiography, as part of a stepwise interdisciplinary cardiovascular team approach. The combined primary endpoint was cardiovascular death, myocardial infarction, emergency coronary revascularization, and life-threatening arrhythmia within 30 days. The secondary endpoint was acute renal failure and severe bleeding., Results: In total, 77 patients (mean age 68.1 ± 8.1 years, 70% male) were included: 39 underwent standard and 38 underwent cardiac risk assessment. The combined primary endpoint was reached significantly more often in patients before than after implementation of the extended cardiac stratification procedure (15% vs. 0%, p = 0.025). The combined secondary endpoint did not differ between the groups., Conclusions: Patients with extended cardiac risk assessment undergoing elective open abdominal aortic surgery had better 30-day outcomes than did those who had standard preoperative assessment., (© 2023. The Author(s), under exclusive licence to Springer Medizin Verlag GmbH, ein Teil von Springer Nature.)
- Published
- 2024
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39. MTHFR Gene C677T Polymorphism (rs1801133) and Susceptibility to Colorectal Polyps in an Azerbaijani Population.
- Author
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Aslanov H, Bayramov B, Reissfelder C, Abdullayeva S, Mammadova Z, Aliyev F, Keese M, Hajibabazade J, and Yagublu V
- Abstract
Background: Understanding the relationships between the methylenetetrahydrofolate reductase ( MTHFR ) gene polymorphism, colorectal polyps, and CRC risk can aid in advancing personalized medicine approaches in CRC prevention. The aim of the current study is to identify the association of C677T polymorphism of the MTHFR gene with the risk of colorectal polyps in the Azerbaijani population., Methods: This study included 125 patients with colon polyps and 155 healthy individuals as a control group. DNA was extracted from venous blood samples obtained from patients and healthy individuals, and the results were analyzed through polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and agarose gel electrophoresis., Results: Wild-type, heterozygote, and homozygous mutant were revealed within 69 (55.2%), 49 (39.2%), and 7 (5.6%) patients and within 100 (64.5%), 45 (29%), and 10 (6.5%) healthy controls, respectively. However, no significant statistical associations were observed between CT and TT genotypes, dominant (CC vs. CT + TT) and recessive (CC + CT vs. TT) models, and the mutant T allele and disease risk. There were also no significant differences between patients and controls regarding age, sex, smoking and alcohol use., Conclusion: Our research did not reveal any significant association between the MTHFR C677T polymorphism and susceptibility to colorectal polyps in the Azerbaijan population.
- Published
- 2023
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40. Adipose-Derived Mesenchymal Stem Cells Protect Endothelial Cells from Hypoxic Injury by Suppressing Terminal UPR In Vivo and In Vitro.
- Author
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Keese M, Zheng J, Yan K, Bieback K, Yard BA, Pallavi P, Reissfelder C, Kluth MA, Sigl M, and Yugublu V
- Subjects
- Humans, Animals, Mice, Neovascularization, Physiologic physiology, Adipose Tissue metabolism, Hypoxia metabolism, Unfolded Protein Response, Ischemia metabolism, Apolipoproteins E genetics, Apolipoproteins E metabolism, Endothelial Cells metabolism, Mesenchymal Stem Cells metabolism
- Abstract
Adipose-derived stem cells (ASCs) have been used as a therapeutic intervention for peripheral artery disease (PAD) in clinical trials. To further explore the therapeutic mechanism of these mesenchymal multipotent stromal/stem cells in PAD, this study was designed to test the effect of xenogeneic ASCs extracted from human adipose tissue on hypoxic endothelial cells (ECs) and terminal unfolded protein response (UPR) in vitro and in an atherosclerosis-prone apolipoprotein E-deficient mice (ApoE
-/- mice) hindlimb ischemia model in vivo. ASCs were added to Cobalt (II) chloride-treated ECs; then, metabolic activity, cell migration, and tube formation were evaluated. Fluorescence-based sensors were used to assess dynamic changes in Ca2+ levels in the cytosolic- and endoplasmic reticulum (ER) as well as changes in reactive oxygen species. Western blotting was used to observe the UPR pathway. To simulate an acute-on-chronic model of PAD, ApoE-/- mice were subjected to a double ligation of the femoral artery (DLFA). An assessment of functional recovery after DFLA was conducted, as well as histology of gastrocnemius. Hypoxia caused ER stress in ECs, but ASCs reduced it, thereby promoting cell survival. Treatment with ASCs ameliorated the effects of ischemia on muscle tissue in the ApoE-/- mice hindlimb ischemia model. Animals showed less muscle necrosis, less inflammation, and lower levels of muscle enzymes after ASC injection. In vitro and in vivo results revealed that all ER stress sensors (BIP, ATF6, CHOP, and XBP1) were activated. We also observed that the expression of these proteins was reduced in the ASCs treatment group. ASCs effectively alleviated endothelial dysfunction under hypoxic conditions by strengthening ATF6 and initiating a transcriptional program to restore ER homeostasis. In general, our data suggest that ASCs may be a meaningful treatment option for patients with PAD who do not have traditional revascularization options.- Published
- 2023
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41. The impact of class I compression stockings on the peripheral microperfusion of the lower limb: A prospective pilot study.
- Author
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Gerken ALH, Hattemer MA, Weiß C, Sigl M, Zach S, Keese M, Nowak K, Reißfelder C, Rahbari NN, and Schwenke K
- Subjects
- Humans, Pilot Projects, Prospective Studies, Cohort Studies, Lower Extremity, Edema therapy, Stockings, Compression, Peripheral Arterial Disease therapy
- Abstract
Objective: The use of medical compression stockings (MCS) in patients with peripheral arterial disease (PAD) and diabetes is the subject of an ongoing critical debate. While reducing leg edema of various origins by improving venous back flow, there is a concern about additional arterial flow obstruction when compression therapy is applied in pre-existing PAD. The aim of this study is to obtain further information on the use of class I MCS in patients with advanced PAD and to evaluate the framework conditions for a safe application., Methods: The total collective (n = 55) of this prospective, clinical cohort study consisted of 24 patients with PAD Fontaine stage IIb and higher studied before revascularization, of whom 16 patients were examined again after revascularization, and 15 healthy participants included for reference. The microperfusion of the lower extremity of all participants was examined in a supine, elevated, and sitting position using the oxygen to see (O2C) method., Results: The results indicate that leg positioning had the strongest influence on microcirculation (SO2 and flow: p = 0.0001), whereas MCS had no significant effect on the perfusion parameters (SO2: p = 0.9936; flow: p = 0.4967) and did not lead to a deterioration of values into critical ranges., Conclusion: Mild medical compression therapy appears to be feasible even in patients with advanced PAD. Larger studies are warranted to observe any long-term effects, in particular for the treatment of reperfusion edema after revascularization., Competing Interests: Declaration of Competing Interest None., (Copyright © 2023. Published by Elsevier Inc.)
- Published
- 2023
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42. A Systematic Review and Bayesian Network Meta-Analysis on the Effect of Different Anticoagulants on the Prophylaxis of Post-Thrombotic Syndrome after Deep Venous Thrombosis.
- Author
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Shao J, Zhou Q, Jin F, Reissfelder C, Sigl M, Yagublu V, and Keese M
- Abstract
Background: Postthrombotic syndrome (PTS) has a major impact on the quality of life after deep venous thrombosis (DVT). From clinical practice and related trials, anticoagulants show potential for reducing the occurrence and alleviating the symptoms of PTS., Methods: A systematic review and Bayesian network meta-analysis (NMA) were conducted by combing the literature from the databases of MEDLINE, Embase, Web of Science, Cochrane Libraries, and ClinicalTrials, through a variety of medical subject headings (Mesh) and PTS keywords. With regard to PTS prophylaxis, all anticoagulant-related randomized controlled trials (RCTs) and observational studies were assessed. The network model was conducted through the R software, and further comparisons were conducted using the Bayesian hierarchical random effects model. The odds ratio (OR) and the corresponding 95% CI were calculated for analysis., Results: Data from two RCTs and nine non-randomized studies meeting the selection criteria were included in the Bayesian analysis model, which incorporated seven anticoagulants. Edoxaban (OR: 0.42, 95% CI: 0.18-1.0) and rivaroxaban (OR: 0.54, 95% CI: 0.38-0.76) were significantly more effective than warfarin in the prevention of PTS (Villalta score ≥ 5). A subgroup analysis based on the severity of PTS showed that rivaroxaban was more effective than warfarin, with OR: 0.59, 95% CI: 0.41-0.84 (Villalta score 5 to 14) and OR: 0.48, 95% CI: 0.22-0.9 (Villalta score ≥ 15, ulceration), respectively. Edoxaban had the highest probability (80.1%) of providing preventive benefits for PTS. For mild/moderate and severe PTS, rivaroxaban provided the highest benefits in preventing PTS (89.3% and 85.6%, respectively)., Conclusion: Edoxaban demonstrated a better prophylactic effect on PTS (Villalta score > 5), while rivaroxaban displayed a better effect against mild/moderate (Villalta score 5 to 14) and severe PTS (Villalta score ≥ 15, ulceration).
- Published
- 2023
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43. Comparison of Tumour-Specific Phenotypes in Human Primary and Expandable Pancreatic Cancer Cell Lines.
- Author
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Guo F, Kan K, Rückert F, Rückert W, Li L, Eberhard J, May T, Sticht C, Dirks WG, Reißfelder C, Pallavi P, and Keese M
- Subjects
- Humans, Pancreas, Cell Line, Phenotype, Tumor Microenvironment genetics, Pancreatic Neoplasms, Pancreatic Neoplasms drug therapy, Pancreatic Neoplasms genetics
- Abstract
There is an ongoing need for patient-specific chemotherapy for pancreatic cancer. Tumour cells isolated from human tissues can be used to predict patients' response to chemotherapy. However, the isolation and maintenance of pancreatic cancer cells is challenging because these cells become highly vulnerable after losing the tumour microenvironment. Therefore, we investigated whether the cells retained their original characteristics after lentiviral transfection and expansion. Three human primary pancreatic cancer cell lines were lentivirally transduced to create expandable (Ex) cells which were then compared with primary (Pri) cells. No obvious differences in the morphology or epithelial-mesenchymal transition (EMT) were observed between the primary and expandable cell lines. The two expandable cell lines showed higher proliferation rates in the 2D and 3D models. All three expandable cell lines showed attenuated migratory ability. Differences in gene expression between primary and expandable cell lines were then compared using RNA-Seq data. Potential target drugs were predicted by differentially expressed genes (DEGs), and differentially expressed pathways (DEPs) related to tumour-specific characteristics such as proliferation, migration, EMT, drug resistance, and reactive oxygen species (ROS) were investigated using the Kyoto Encyclopedia of Genes and Genomes (KEGG) database. We found that the two expandable cell lines expressed similar chemosensitivity and redox-regulatory capability to gemcitabine and oxaliplatin in the 2D model as compared to their counterparts. In conclusion, we successfully generated expandable primary pancreatic cancer cell lines using lentiviral transduction. These expandable cells not only retain some tumour-specific biological traits of primary cells but also show an ongoing proliferative capacity, thereby yielding sufficient material for drug response assays, which may provide a patient-specific platform for chemotherapy drug screening.
- Published
- 2023
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44. Analysis of Inflammation-Related Genes in Patients with Stanford Type A Aortic Dissection.
- Author
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Li L, Zeng Z, Yagublu V, Rahbari N, Reißfelder C, and Keese M
- Abstract
Background: Aortic dissection (AD) is a life-threatening cardiovascular disease. Pathophysiologically, it has been shown that aortic wall inflammation promotes the occurrence and development of aortic dissection. Thus, the aim of the current research was to determine the inflammation-related biomarkers in AD. Methods: In this study, we conducted differentially expressed genes (DEGs) analysis using the GSE153434 dataset containing 10 type A aortic dissection (TAAD) and 10 normal samples downloaded from the Gene Expression Omnibus (GEO) database. The intersection of DEGs and inflammation-related genes was identified as differential expressed inflammation-related genes (DEIRGs). Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed for DEIRGs. We then constructed the protein-protein interaction (PPI) network using the Search Tool for the Retrieval of Interacting Genes/Proteins (STRING) database and identified hub genes using the Cytoscape plugin MCODE. Finally, least absolute shrinkage and selection operator (LASSO) logistic regression was used to construct a diagnostic model. Results: A total of 1728 DEGs were identified between the TAAD and normal samples. Thereafter, 61 DEIRGs are obtained by taking the intersection of DEGs and inflammation-related genes. The GO indicated that DEIRGs were mainly enriched in response to lipopolysaccharide, in response to molecules of bacterial origin, secretory granule membrane, external side of plasma, receptor ligand activity, and signaling receptor activator activity. KEGG analysis indicated that DEIRGs were mainly enriched in cytokine-cytokine receptor interaction, TNF signaling pathway, and proteoglycans in cancer. We identified MYC , SELL , HIF1A , EDN1 , SERPINE1 , CCL20 , IL1R1 , NOD2 , TLR2 , CD69 , PLAUR , MMP14 , and HBEGF as hub genes using the MCODE plug-in. The ROC indicated these genes had a good diagnostic performance for TAAD. Conclusion: In conclusion, our study identified 13 hub genes in the TAAD. This study will be of significance for the future development of a preventive therapy of TAAD.
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- 2023
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45. ABCB5 + mesenchymal stromal cells therapy protects from hypoxia by restoring Ca 2+ homeostasis in vitro and in vivo.
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Yan K, Zheng J, Kluth MA, Li L, Ganss C, Yard B, Magdeburg R, Frank MH, Pallavi P, and Keese M
- Subjects
- Animals, Humans, Mice, ATP Binding Cassette Transporter, Subfamily B metabolism, Cells, Cultured, Homeostasis, Human Umbilical Vein Endothelial Cells metabolism, Hypoxia therapy, Hypoxia metabolism, Ischemia metabolism, Neovascularization, Physiologic physiology, Calcium metabolism, Mesenchymal Stem Cell Transplantation, Mesenchymal Stem Cells metabolism
- Abstract
Background: Hypoxia in ischemic disease impairs Ca
2+ homeostasis and may promote angiogenesis. The therapeutic efficacy of mesenchymal stromal cells (MSCs) in peripheral arterial occlusive disease is well established, yet its influence on cellular Ca2+ homeostasis remains to be elucidated. We addressed the influence of ATP-binding cassette subfamily B member 5 positive mesenchymal stromal cells (ABCB5+ MSCs) on Ca2+ homeostasis in hypoxic human umbilical vein endothelial cells (HUVECs) in vitro and in vivo., Methods: Hypoxia was induced in HUVECs by Cobalt (II) chloride (CoCl2 ) or Deferoxamine (DFO). Dynamic changes in the cytosolic- and endoplasmic reticulum (ER) Ca2+ and changes in reactive oxygen species were assessed by appropriate fluorescence-based sensors. Metabolic activity, cell migration, and tube formation were assessed by standard assays. Acute-on-chronic ischemia in Apolipoprotein E knock-out (ApoE-/- ) mice was performed by double ligation of the right femoral artery (DFLA). ABCB5+ MSC cells were injected into the ischemic limb. Functional recovery after DFLA and histology of gastrocnemius and aorta were assessed., Results: Hypoxia-induced impairment of cytosolic and ER Ca2+ were restored by ABCB5+ MSCs or their conditioned medium. Similar was found for changes in intracellular ROS production, metabolic activity, migratory ability and tube formation. The restoration was paralleled by an increased expression of the Ca2+ transporter Sarco-/endoplasmic reticulum ATPase 2a (SERCA2a) and the phosphorylation of Phospholamban (PLN). In acute-on-chronic ischemia, ABCB5+ MSCs treated mice showed a higher microvascular density, increased SERCA2a expression and PLN phosphorylation relative to untreated controls., Conclusions: ABCB5+ MSCs therapy can restore cellular Ca2+ homeostasis, which may beneficially affect the angiogenic function of endothelial cells under hypoxia in vitro and in vivo., (© 2023. The Author(s).)- Published
- 2023
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46. Investigation of Different Methods of Intraoperative Graft Perfusion Assessment during Kidney Transplantation for the Prediction of Delayed Graft Function: A Prospective Pilot Trial.
- Author
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Gerken ALH, Keese M, Weiss C, Krücken HS, Pecher KAP, Ministro A, Rahbari NN, Reissfelder C, Rother U, Yazdani B, Kälsch AI, Krämer BK, and Schwenke K
- Abstract
Delayed graft function (DGF) after renal transplantation is a relevant clinical problem affecting long-term organ function. The early detection of patients at risk is crucial for postoperative monitoring and treatment algorithms. In this prospective cohort study, allograft perfusion was evaluated intraoperatively in 26 kidney recipients by visual and formal perfusion assessment, duplex sonography, and quantitative microperfusion assessment using O2C spectrometry and ICG fluorescence angiography. The O2C tissue spectrometry device provides a quantitative method of microperfusion assessment that can be employed during kidney transplantation as an easy-to-use and highly sensitive alternative to ICG fluorescence angiography. Intraoperative microvascular flow and velocity in the allograft cortex after reperfusion predicted DGF with a sensitivity of 100% and a specificity of 82%. Threshold values of 57 A.U. for microvascular flow and 13 A.U. for microvascular velocity were identified by an ROC analysis. This study, therefore, confirmed that impairment of microperfusion of the allograft cortex directly after reperfusion was a key indicator for the occurrence of DGF after kidney transplantation. Our results support the combined use of intraoperative duplex sonography, for macrovascular quality control, and quantitative microperfusion assessment, such as O2C spectrometry, for individual risk stratification to guide subsequent postoperative management.
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- 2022
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47. Concurrent stimulation of monocytes with CSF1 and polarizing cytokines reveals phenotypic and functional differences with classical polarized macrophages.
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An L, Michaeli J, Pallavi P, Breedijk A, Xu X, Dietrich N, Sigl M, Keese M, Nitschke K, Jarczyk J, Nuhn P, Krämer BK, Yard BA, and Leipe J
- Subjects
- Cell Differentiation, Cells, Cultured, Cyclooxygenase 2 metabolism, Lipopolysaccharides metabolism, Lipopolysaccharides pharmacology, Macrophages metabolism, Cytokines metabolism, Monocytes metabolism
- Abstract
In atherosclerotic lesions, macrophages are exposed to CSFs and various microenvironmental cues, which ultimately drive their polarization state. We studied the expression of different CSFs in artery specimen and cultured vascular cells and assessed whether concurrent stimulation (CS) of monocytes with CSF1 and polarizing cytokines generated macrophages (CSM1 and CSM2) that were phenotypically and functionally different from classically polarized M1 and M2 macrophages. We also assessed the influence of acetylsalicylic acid (ASA) on the capacity of polarized macrophages to stimulate T-cell proliferation. CSF1 was the most prominent CSF expressed in arteries and cultured vascular cells. M1 and CSM1 macrophages differed in CD86 and CD14 expression, which was up-regulated respectively down-regulated by LPS. M2 and CSM2 macrophages were phenotypically similar. Cyclooxygenase expression was different in CSM1 (COX-1
- and COX-2+ after LPS stimulation) and CSM2 (COX-1+ and COX-2- ) macrophages. TNFα production was more pronounced in CSM1 macrophages, whereas IL-10 was produced at higher levels by CSM2 macrophages. Proliferation of allogeneic T cells was strongly supported by CSM2, but not by CSM1 polarized macrophages. Although ASA did not affect anti-CD3/CD28-mediated proliferation, it significantly reduced CSM2 and CSM1-mediated T-cell proliferation. Supernatants of LPS-stimulated CSM2 but not of CSM1 macrophages could overcome the inhibition by ASA. Hence, we demonstrate that CSM1 and CSM2 macrophages are phenotypically and to some extent functionally distinct from classically polarized M1 and M2 macrophages. CSM2 macrophages produce a COX-1-dependent soluble factor that supports T-cell proliferation, the identity hereof is still elusive and warrants further studies., (© 2022 The Authors. Journal of Leukocyte Biology published by Wiley Periodicals LLC on behalf of Society for Leukocyte Biology.)- Published
- 2022
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48. Quantitative Assessment of Intraoperative Laser Fluorescence Angiography With Indocyanine Green Predicts Early Graft Function After Kidney Transplantation.
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Gerken ALH, Nowak K, Meyer A, Weiss C, Krüger B, Nawroth N, Karampinis I, Heller K, Apel H, Reissfelder C, Schwenke K, Keese M, Lang W, and Rother U
- Subjects
- Delayed Graft Function, Fluorescein Angiography, Graft Survival, Humans, Indocyanine Green, Lasers, Prospective Studies, Risk Factors, Tissue Donors, Kidney Transplantation methods
- Abstract
Objective: This study was designed to demonstrate the predictive ability of quantitative indocyanine green (ICG) fluorescence angiography for the short-term postoperative outcome, the occurrence of delayed graft function (DGF), and long-term graft survival., Summary Background Data: DGF is a relevant problem after kidney transplantation; sufficient microperfusion of the allograft is crucial for postoperative organ function. Fluorescence angiography with ICG can serve as an intraoperative quality control of microperfusion., Methods: This prospective diagnostic study, conducted in 2 German transplantation centers from November 2015 to October 2018, included 128 consecutive kidney transplantations. Intraoperative assessment of the allograft microperfusion was performed by near-infrared fluorescence angiography with ICG; a software was used for quantitative analysis. The associations between perfusion parameters (eg, ICG Ingress) and donor, recipient, peri-procedural, and postoperative characteristics were evaluated., Results: DGF occurred in 23 (24%) kidney recipients from deceased donors. ICG Ingress ( P = 0.0027), donor age ( P = 0.0452), recipient age ( P = 0.0139), and recipient body mass index ( P = 0.0017) were associated with DGF. ICG Ingress correlated significantly with recipient age (r = -0.27662, P = 0.0016), cold and warm ischemia time (r = -0.25204, P = 0.0082; r = -0.19778, P = 0.0283), operating time (r = -0.32208, P = 0.0002), eGFR on postoperative days 1 (r =+0.22674, P = 0.0104) and 7 (r = +0.33189, P = 0.0001). The cutoff value for ICG Ingress was 106.23 AU with sensitivity of 78.3% and specificity of 80.8% ( P < 0.0001) for the prediction of DGF., Conclusion: Fluorescence angiography with ICG allows intraoperative quantitative assessment of microperfusion during kidney transplantation. The parameter ICG Ingress reflects recipient and procedure characteristics and is able to predict the incidence of DGF., Trial Registration: Clinicaltrials.gov: NCT-02775838., Competing Interests: The authors report no conflicts of interest. K.N. works as a consultant for Stryker and Novadaq in the field of intraoperative fluorescence imaging, all others declare no conflict of interests., (Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc.)
- Published
- 2022
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49. Potential Therapeutic Effects of Long-Term Stem Cell Administration: Impact on the Gene Profile and Kidney Function of PKD/Mhm (Cy/+) Rats.
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Nardozi D, Palumbo S, Khan AUM, Sticht C, Bieback K, Sadeghi S, Kluth MA, Keese M, and Gretz N
- Abstract
Cystic kidney disease (CKD) is a heterogeneous group of genetic disorders and one of the most common causes of end-stage renal disease. Here, we investigate the potential effects of long-term human stem cell treatment on kidney function and the gene expression profile of PKD/Mhm (Cy/+) rats. Human adipose-derived stromal cells (ASC) and human skin-derived ABCB5
+ stromal cells (2 × 106 ) were infused intravenously or intraperitoneally monthly, over 6 months. Additionally, ASC and ABCB5+ -derived conditioned media were administrated intraperitoneally. The gene expression profile results showed a significant reprogramming of metabolism-related pathways along with downregulation of the cAMP, NF-kB and apoptosis pathways. During the experimental period, we measured the principal renal parameters as well as renal function using an innovative non-invasive transcutaneous device. All together, these analyses show a moderate amelioration of renal function in the ABCB5+ and ASC-treated groups. Additionally, ABCB5+ and ASC-derived conditioned media treatments lead to milder but still promising improvements. Even though further analyses have to be performed, the preliminary results obtained in this study can lay the foundations for a novel therapeutic approach with the application of cell-based therapy in CKD.- Published
- 2022
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50. Identification of the Key Genes and Potential Therapeutic Compounds for Abdominal Aortic Aneurysm Based on a Weighted Correlation Network Analysis.
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Li L, Kan K, Pallavi P, and Keese M
- Abstract
Background: There is still an unmet need for therapeutic drugs for patients with an abdominal aortic aneurysm (AAA), especially for candidates unsuitable for surgical or interventional repair. Therefore, the purpose of this in silico study is to identify significant genes and regulatory mechanisms in AAA patients to predicate the potential therapeutic compounds for significant genes., Methods: The GSE57691 dataset was obtained from Gene Expression Omnibus (GEO) and used to identify the differentially expressed genes (DEGs) and weighted correlation network analysis (WGCNA). The biological function of DEGs was determined using gene ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG). AAA-related genes were obtained from the Comparative Toxicogenomics Database (CTD) using the keywords: aortic aneurysm and abdominal. The hub genes in AAA were obtained by overlapping DEGs, WGCNA-based hub genes, and CTD-based genes. The diagnostic values of hub genes were determined using ROC curve analysis. Hereby, a TF-miRNA-hub gene network was constructed based on the miRnet database. Using these data, potential therapeutic compounds for the therapy of AAA were predicted based on the Drug Gene Interaction Database (DGIdb)., Results: A total of 218 DEGs (17 upregulated and 201 downregulated) and their biological function were explored; 4093 AAA-related genes were derived by text mining. Three hub modules and 144 hub genes were identified by WGCNA. asparagine synthetase (ASNS), axin-related protein 2 (AXIN2), melanoma cell adhesion molecule (MCAM), and the testis-specific Y-encoded-like protein 1 (TSPYL1) were obtained as intersecting hub genes and the diagnostic values were confirmed with ROC curves. As potential compounds targeting the hub genes, asparaginase was identified as the target compound for ASNS. Prednisolone and abiraterone were identified as compounds targeting TSPYL1. For MCAM and TSPYL1, no potential therapeutic compound could be predicted., Conclusion: Using WGCNA analysis and text mining, pre-existing gene expression data were used to provide novel insight into potential AAA-related protein targets. For two of these targets, compounds could be predicted.
- Published
- 2022
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