10 results on '"Jackson, Isaac M"'
Search Results
2. Development of a CD19 PET tracer for detecting B cells in a mouse model of multiple sclerosis
- Author
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Stevens, Marc Y., Cropper, Haley C., Lucot, Katherine L., Chaney, Aisling M., Lechtenberg, Kendra J., Jackson, Isaac M., Buckwalter, Marion S., and James, Michelle L.
- Published
- 2020
- Full Text
- View/download PDF
3. PET Imaging of Innate Immune Activation Using 11C Radiotracers Targeting GPR84
- Author
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Kalita, Mausam, Park, Jun Hyung, Kuo, Renesmee Chenting, Hayee, Samira, Marsango, Sara, Straniero, Valentina, Alam, Israt S., Rivera-Rodriguez, Angelie, Pandrala, Mallesh, Carlson, Mackenzie L., Reyes, Samantha T., Jackson, Isaac M., Suigo, Lorenzo, Luo, Audrey, Nagy, Sydney C., Valoti, Ermanno, Milligan, Graeme, Habte, Frezghi, Shen, Bin, and James, Michelle L.
- Abstract
Chronic innate immune activation is a key hallmark of many neurological diseases and is known to result in the upregulation of GPR84 in myeloid cells (macrophages, microglia, and monocytes). As such, GPR84 can potentially serve as a sensor of proinflammatory innate immune responses. To assess the utility of GPR84 as an imaging biomarker, we synthesized 11C-MGX-10Sand 11C-MGX-11Sviacarbon-11 alkylation for use as positron emission tomography (PET) tracers targeting this receptor. In vitroexperiments demonstrated significantly higher binding of both radiotracers to hGPR84-HEK293 cells than that of parental control HEK293 cells. Co-incubation with the GPR84 antagonist GLPG1205 reduced the binding of both radiotracers by >90%, demonstrating their high specificity for GPR84 in vitro. In vivoassessment of each radiotracer viaPET imaging of healthy mice illustrated the superior brain uptake and pharmacokinetics of 11C-MGX-10Scompared to 11C-MGX-11S. Subsequent use of 11C-MGX-10Sto image a well-established mouse model of systemic and neuro-inflammation revealed a high PET signal in affected tissues, including the brain, liver, lung, and spleen. In vivospecificity of 11C-MGX-10Sfor GPR84 was confirmed by the administration of GLPG1205 followed by radiotracer injection. When compared with 11C-DPA-713─an existing radiotracer used to image innate immune activation in clinical research studies─11C-MGX-10Shas multiple advantages, including its higher binding signal in inflamed tissues in the CNS and periphery and low background signal in healthy saline-treated subjects. The pronounced uptake of 11C-MGX-10Sduring inflammation, its high specificity for GPR84, and suitable pharmacokinetics strongly support further investigation of 11C-MGX-10Sfor imaging GPR84-positive myeloid cells associated with innate immune activation in animal models of inflammatory diseases and human neuropathology.
- Published
- 2023
- Full Text
- View/download PDF
4. Futureproofing [18F]Fludeoxyglucose manufacture at an Academic Medical Center
- Author
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Sowa, Alexandra R, Jackson, Isaac M, Desmond, Timothy J, Alicea, Jeremiah, Mufarreh, Anthony J, Pham, Jonathan M, Stauff, Jenelle, Winton, Wade P, Fawaz, Maria V, Henderson, Bradford D, Hockley, Brian G, Rogers, Virginia E, Koeppe, Robert A, and Scott, Peter J H
- Published
- 2018
- Full Text
- View/download PDF
5. Tracking Innate Immune Activation in a Mouse Model of Parkinson’s Disease Using TREM1 and TSPO PET Tracers
- Author
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Lucot, Katherine L., primary, Stevens, Marc Y., additional, Bonham, T. Adam, additional, Azevedo, E. Carmen, additional, Chaney, Aisling M., additional, Webber, Ebony D., additional, Jain, Poorva, additional, Klockow, Jessica L., additional, Jackson, Isaac M., additional, Carlson, Mackenzie L., additional, Graves, Edward E., additional, Montine, Thomas J., additional, and James, Michelle L., additional
- Published
- 2022
- Full Text
- View/download PDF
6. Additional file 1 of Use of 55 PET radiotracers under approval of a Radioactive Drug Research Committee (RDRC)
- Author
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Jackson, Isaac M., Lee, So Jeong, Sowa, Alexandra R., Rodnick, Melissa E., Bruton, Laura, Clark, Mara, Preshlock, Sean, Rothley, Jill, Rogers, Virginia E., Botti, Leslie E., Henderson, Bradford D., Hockley, Brian G., Jovany Torres, Raffel, David M., Brooks, Allen F., Frey, Kirk A., Kilbourn, Michael R., Koeppe, Robert A., Shao, Xia, and Scott, Peter J. H.
- Subjects
Data_FILES - Abstract
Additional file 1.
- Published
- 2020
- Full Text
- View/download PDF
7. Additional file 1 of Development of a CD19 PET tracer for detecting B cells in a mouse model of multiple sclerosis
- Author
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Stevens, Marc Y., Cropper, Haley C., Lucot, Katherine L., Chaney, Aisling M., Lechtenberg, Kendra J., Jackson, Isaac M., Buckwalter, Marion S., and James, Michelle L.
- Abstract
Additional file 1: Suppl. Fig 1. Generation of the first reported PET tracer for CD19+ B cells via DOTA-conjugation of a CD19-specific mAb and subsequent radiolabeling with copper-64 ([64Cu]). Suppl. Fig. 2. In vitro autoradiography of [64Cu]CD19-mAb and anatomical staining of spleen and brain tissue sections. Frozen tissue sections were allowed to reach ambient temperature, after which they were washed in 50 mM Tris-HCl for 3x5 min at pH 7.4, before drying under airflow for 30 min. A perimeter was drawn around the tissue with a hydrophobic pen and blocking antibody (1000x based on specific activity calculated by spectrophotometry) was added to half of the slides, followed by incubation for 30 min at ambient temperature. After washing off the blocking slides (3x2 min Tris-HCl, 50 mM, pH 7.4), a solution containing [64Cu]CD19-mAb tracer (500 μL, 2.5 μCi/mL) was carefully applied using a pipette and slides were left to incubate for 30 min, before 3x2 min washes in Tris-HCl (50 mM, pH 7.4, ambient temperature). Finally, all slides were dipped twice into ice water and left to dry for 30 min under airflow. Slides were transferred to a phosphorimaging plate and stored at -20 °C for 24 h, before development using a Typhoon laser scanner. Gel images were analyzed using ImageJ software. Fig. 3A. In vivo PET detects increased signal in distinct brain regions. 3D brain atlas tool from Invicro (Boston, MA) allows automated analysis of individual brain regions. Skull CT was used to define total brain volume for determination of activity. n=5 naïve, n=6 EAE, **p=.0082, two-way ANOVA. Suppl. Fig. 3B. Uptake of [64Cu]CD19-mAb corresponds to spatial distribution observed in immunohistochemistry. A. Ex vivo autoradiography, 50 μm resolution. B. Quantitation of uptake in cerebellum, n=4 naïve and EAE, *p=.0286, unpaired t-test. Coloured outlines denote ROIs drawn in ImageJ. Suppl. Fig. 4A. Samples were analyzed by ESI-MS on an Agilent 1260 HPLC and Bruker MicroTOF-Q II, running a 12 min gradient of 5 to 95% 0.1% formic acid in MeCN, solvent A was 0.1% formic acid in water. Panels A and C depict the TIC of unconjugated and immunoconjugate (2.9 DOTA) running in positive mode, B and D depict the deconvoluted mass spectra of the same compounds. The column was a Waters MassPREP 5x2.1mm diphenyl desalting column, the temperature was 50 °C, and the flow rate was 0.3ml/min. Injection volume was 15 μL. Suppl. Fig. 4B. Antibody samples underwent buffer exchange/desalting using Zip-Tip C18 filters, at a final concentration of approx. 1 mg/mL in 0.1% TFA/60% MeCN/40% H2O. Each spot was loaded with approx. 1 μg, 0.5 pmol internal standard (BSA) was added and samples were analysed using an Applied Biosystems SCIEX 5800 TOF/TOF instrument with high mass detection. A. Unconjugated antibody. B. Immunoconjugate following addition of chelator. Suppl. Fig. 5. Antibody samples were analyzed by SEC-HPLC. A) UV (280 nm), unconjugated CD19 anti-mouse antibody, clone 6D5. B) UV (280 nm), immunoconjugate following DOTA chelation. C. Radiochromatogram of B. Suppl. Fig. 6. Femur PET/CT shows increased signal in naïve mice compared to EAE, likely due to CD19-positive B cells trafficking out of bone marrow in diseased mice. Bone was identified using Otsu thresholding and bone marrow ROIs were drawn in manually. A) Representative PET/CT image from femur of naïve and EAE mice. (B) In vivo PET quantitation of PET image, n=5 naïve, n=6 EAE, **p=.0071, unpaired t-test. Suppl. Fig. 7. Ex vivo gamma counting of [64Cu]CD19-mAb biodistribution showing no significant differences between EAE and naive heart, liver, and muscle 24 h after tracer injection. n=5 naïve, n=6 EAE,**p=.0021, ****p
- Published
- 2020
- Full Text
- View/download PDF
8. Neuroinflammation PET Imaging: Current Opinion and Future Directions
- Author
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Jain, Poorva, primary, Chaney, Aisling M., additional, Carlson, Mackenzie L., additional, Jackson, Isaac M., additional, Rao, Anoushka, additional, and James, Michelle L., additional
- Published
- 2020
- Full Text
- View/download PDF
9. Futureproofing [18F]Fludeoxyglucose manufacture at an Academic Medical Center.
- Author
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Sowa, Alexandra R, Jackson, Isaac M, Desmond, Timothy J, Alicea, Jeremiah, Mufarreh, Anthony J, Pham, Jonathan M, Stauff, Jenelle, Winton, Wade P, Fawaz, Maria V, Henderson, Bradford D, Hockley, Brian G, Rogers, Virginia E, Koeppe, Robert A, and Scott, Peter J H
- Subjects
NUCLEAR medicine ,FLUORODEOXYGLUCOSE F18 ,NIOBIUM ,RADIOCHEMISTRY ,MEDICAL centers - Abstract
Background: We recently upgraded our [
18 F]fludeoxyglucose (FDG) production capabilities with the goal of futureproofing our FDG clinical supply, expanding the number of batches of FDG we can manufacture each day, and improving patient throughput in our nuclear medicine clinic. In this paper we report upgrade of the synthesis modules to the GE FASTLab 2 platform (Phase 1) and cyclotron updates (Phase 2) from both practical and regulatory perspectives. We summarize our experience manufacturing FDG on the FASTLab 2 module with a high-yielding self-shielded niobium (Nb) fluorine-18 target.Results: Following installation of Nb targets for production of fluorine-18, a 55 μA beam for 22 min generated 1330 ± 153 mCi of [18 F]fluoride. Using these cyclotron beam parameters in combination with the FASTLab 2, activity yields (AY) of FDG were 957 ± 102 mCi at EOS, corresponding to 72% non-corrected AY (n = 235). Our workflow, inventory management and regulatory compliance have been greatly simplified following the synthesis module and cyclotron upgrades, and patient wait times for FDG PET have been cut in half at our nuclear medicine clinic.Conclusions: The combination of FASTlab 2 and self-shielded Nb fluorine-18 targets have improved our yield of FDG, and enabled reliable and repeatable manufacture of the radiotracer for clinical use. [ABSTRACT FROM AUTHOR]- Published
- 2018
- Full Text
- View/download PDF
10. PET Imaging of Innate Immune Activation Using 11 C Radiotracers Targeting GPR84.
- Author
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Kalita M, Park JH, Kuo RC, Hayee S, Marsango S, Straniero V, Alam IS, Rivera-Rodriguez A, Pandrala M, Carlson ML, Reyes ST, Jackson IM, Suigo L, Luo A, Nagy SC, Valoti E, Milligan G, Habte F, Shen B, and James ML
- Abstract
Chronic innate immune activation is a key hallmark of many neurological diseases and is known to result in the upregulation of GPR84 in myeloid cells (macrophages, microglia, and monocytes). As such, GPR84 can potentially serve as a sensor of proinflammatory innate immune responses. To assess the utility of GPR84 as an imaging biomarker, we synthesized
11 C-MGX-10S and11 C-MGX-11S via carbon-11 alkylation for use as positron emission tomography (PET) tracers targeting this receptor. In vitro experiments demonstrated significantly higher binding of both radiotracers to hGPR84-HEK293 cells than that of parental control HEK293 cells. Co-incubation with the GPR84 antagonist GLPG1205 reduced the binding of both radiotracers by >90%, demonstrating their high specificity for GPR84 in vitro . In vivo assessment of each radiotracer via PET imaging of healthy mice illustrated the superior brain uptake and pharmacokinetics of11 C-MGX-10S compared to11 C-MGX-11S . Subsequent use of11 C-MGX-10S to image a well-established mouse model of systemic and neuro-inflammation revealed a high PET signal in affected tissues, including the brain, liver, lung, and spleen. In vivo specificity of11 C-MGX-10S for GPR84 was confirmed by the administration of GLPG1205 followed by radiotracer injection. When compared with11 C-DPA-713-an existing radiotracer used to image innate immune activation in clinical research studies-11 C-MGX-10S has multiple advantages, including its higher binding signal in inflamed tissues in the CNS and periphery and low background signal in healthy saline-treated subjects. The pronounced uptake of11 C-MGX-10S during inflammation, its high specificity for GPR84, and suitable pharmacokinetics strongly support further investigation of11 C-MGX-10S for imaging GPR84-positive myeloid cells associated with innate immune activation in animal models of inflammatory diseases and human neuropathology., Competing Interests: The authors declare no competing financial interest., (© 2023 American Chemical Society.)- Published
- 2023
- Full Text
- View/download PDF
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