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1. Synthesis and in vitro experiments of carcinoma vascular endothelial targeting polymeric nano-micelles combining small particle size and supermagnetic sensitivity.

Author

Zhang Y, Pan J, Xu Q, Li H, Wang J, Zhang C, and Hong G

Subjects
Carcinoma pathology, Cell Line, Tumor, Contrast Media chemistry, Endothelial Cells drug effects, Endothelial Cells pathology, Ethylene Glycols chemistry, Ferric Compounds administration & dosage, Ferric Compounds chemistry, Humans, Liver Neoplasms physiopathology, Magnetic Resonance Imaging, Magnetite Nanoparticles administration & dosage, Magnetite Nanoparticles chemistry, Micelles, Particle Size, Polyesters chemistry, Carcinoma diagnostic imaging, Contrast Media administration & dosage, Ethylene Glycols administration & dosage, Liver Neoplasms diagnostic imaging, Polyesters administration & dosage
Abstract

Objective: To construct carcinoma vascular endothelial-targeted polymeric nanomicelles with high magnetic resonance imaging (MRI) sensitivity and to evaluate their biological safety and in vitro tumor-targeting effect, and to monitor their feasibility using clinical MRI scanner. Method: Amphiphilic block copolymer, poly(ethylene glycol)- b -poly(ε-caprolactone) (PEG-PCL) was synthesized via the ring-opening polymerization of ε-caprolactone (CL) initiated by poly(ethylene glycol) (PEG), in which cyclic pentapeptide Arg-Gly-Asp (cRGD) was conjugated with the terminal of hydrophilic PEG block. During the self-assembly of PEG-PCL micelles, superparamagnetic γ-Fe 2 O 3 nanoparticles (11 nm) was loaded into the hydrophobic core. The cRGD-terminated γ-Fe 2 O 3 -loaded polymeric micelles targeting to carcinoma vascular endothelial cells, were characterized in particle size, morphology, loading efficiency and so on, especially high MRI sensitivity in vitro. Normal hepatic vascular endothelial cells (ED25) were incubated with the resulting micelles for assessing their safety. Human hepatic carcinoma vascular endothelial cells (T3A) were cultured with the resulting micelles to assess the micelle uptake using Prussian blue staining and the cell signal intensity using MRI. Results: All the polymeric micelles exhibited ultra-small particle sizes with approximately 50 nm, high relaxation rate, and low toxicity even at high iron concentrations. More blue-stained iron particles were present in the targeting group than the non-targeting and competitive inhibition groups. In vitro MRI showed T 2 WI and T 2 relaxation times were significantly lower in the targeting group than in the other two groups. Conclusion: γ-Fe 2 O 3 -loaded PEG-PCL micelles not only possess ultra-small size and high superparamagnetic sensitivity, also can be actively targeted to carcinoma vascular endothelial cells by tumor-targeted cRGD. It appears to be a promising contrast agent for tumor-targeted imaging., Competing Interests: Competing Interests: The authors have declared that no competing interest exists.

Published
2018
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2. p53 regulates epithelial–mesenchymal transition through microRNAs targeting ZEB1 and ZEB2

Author

Young-Jun Jeon, Flavia Pichiorri, Angelo Veronese, Pascal Pineau, Anne Dejean, Tae Jin Lee, Hansjuerg Alder, Agnès Marchio, Stefano Volinia, Taewan Kim, Jeff Palatini, Chang Gong Liu, Sung Suk Suh, Carlo M. Croce, Comprehensive Cancer Center [Colombus], Ohio State University [Columbus] (OSU), Molecular, Cellular, and Developmental Biology Program [Columbus] (MCDB), Organisation Nucléaire et Oncogenèse, Institut Pasteur [Paris] (IP)-Institut National de la Santé et de la Recherche Médicale (INSERM), This work was funded by National Cancer Institute grant RC2 CA148302., We thank Dr. B. Vogelstein for p53+/+ and p53−/− RKO cells, Dr. Gustavo Leone for p53+/+ and p53−/− MEFs, Dr. Gregory J. Goodall for pCIneo-hRL-ZEB1/2 constructs, and Dr. Anders H. Lund for pcDNA3-Zeb2-HA constructs. We also thank Dr. Kay Huebner (The Ohio State University), Dr. Thomas D. Schmittgen (The Ohio State University), and Susan Lutz for careful editing of this paper, and Sharon Palko and Dorothee Wernicke-Jameson for the administrative support., Pineau, Pascal, and Institut Pasteur [Paris]-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
Male, MESH: Zinc Finger E-box-Binding Homeobox 1, genetics/metabolism, biosynthesis/genetics, Metastasis, genetics/metabolism/pathology, 0302 clinical medicine, MESH: Liver Neoplasms, Immunology and Allergy, genetics, RNA, Neoplasm, Neoplasm Metastasis, MESH: Carcinoma, Hepatocellular, MESH: Tumor Suppressor Protein p53, 0303 health sciences, digestive, oral, and skin physiology, Liver Neoplasms, Hep G2 Cells, MESH: Gene Expression Regulation, Neoplastic, MESH: Transcription Factors, Gene Expression Regulation, Neoplastic, MESH: Repressor Proteins, 030220 oncology & carcinogenesis, embryonic structures, Female, Transcriptional Activation, Carcinoma, Hepatocellular, Epithelial-Mesenchymal Transition, Immunology, Repressor, MESH: Hep G2 Cells, [SDV.CAN]Life Sciences [q-bio]/Cancer, Biology, 03 medical and health sciences, MESH: Gene Expression Profiling, [SDV.CAN] Life Sciences [q-bio]/Cancer, microRNA, MESH: Homeodomain Proteins, medicine, [SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, Humans, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Epithelial–mesenchymal transition, Transcription factor, Zinc Finger E-box Binding Homeobox 2, 030304 developmental biology, MESH: Zinc Finger E-box Binding Homeobox 2, Homeodomain Proteins, Neoplastic, MESH: Humans, Gene Expression Profiling, Carcinoma, Brief Definitive Report, Zinc Finger E-box-Binding Homeobox 1, Hepatocellular, Cell Biology, HCCS, medicine.disease, MESH: RNA, Neoplasm, MESH: Neoplasm Metastasis, MESH: Male, Repressor Proteins, Gene expression profiling, MicroRNAs, MESH: Epithelial-Mesenchymal Transition, Gene Expression Regulation, Tumor progression, Cancer research, RNA, Neoplasm, MESH: Transcriptional Activation, genetics/metabolism/pathology, Epithelial-Mesenchymal Transition, Female, Gene Expression Profiling, Gene Expression Regulation, Neoplastic, Hep G2 Cells, Homeodomain Proteins, biosynthesis/genetics, Humans, Liver Neoplasms, genetics/metabolism/pathology, Male, MicroRNAs, genetics/metabolism, Neoplasm Metastasis, RNA, genetics/metabolism, Repressor Proteins, biosynthesis/genetics, Transcription Factors, biosynthesis/genetics, Transcriptional Activation, genetics, Tumor Suppressor Protein p53, Tumor Suppressor Protein p53, MESH: Female, MESH: MicroRNAs, 030215 immunology, Transcription Factors
Abstract

By transactivating expression of miRNAs that repress expression of the ZEB1 and ZEB2 transcription factors, p53 inhibits the epithelial–mesenchymal transition., p53 suppresses tumor progression and metastasis. Epithelial–mesenchymal transition (EMT) is a key process in tumor progression and metastasis. The transcription factors ZEB1 and ZEB2 promote EMT. Here, we show that p53 suppresses EMT by repressing expression of ZEB1 and ZEB2. By profiling 92 primary hepatocellular carcinomas (HCCs) and 9 HCC cell lines, we found that p53 up-regulates microRNAs (miRNAs), including miR-200 and miR-192 family members. The miR-200 family members transactivated by p53 then repress ZEB1/2 expression. p53-regulated miR-192 family members also repress ZEB2 expression. Inhibition or overexpression of the miRNAs affects p53-regulated EMT by altering ZEB1 and ZEB2 expression. Our findings indicate that p53 can regulate EMT, and that p53-regulated miRNAs are critical mediators of p53-regulated EMT.

Published
2011
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