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Gao S. My 20 years together with Journal of Oral Pathology and Medicine. J Oral Pathol Med 2023; 52:324-327. [PMID: 36622757 DOI: 10.1111/jop.13403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 12/21/2022] [Indexed: 01/10/2023]
Abstract
Shan Gao has served at Journal of Oral Pathology and Medicine (JOPM) for 20 years, and currently as Associate Editor of JOMP, Beijing, China. After he finished his 8 year education in Stomatology for both bachelor and master degrees, he started 10 years of clinic practice in Endodontics and Oral Medicine in China, followed by 12 years basic research work in Molecular Biology, including 3 years for a PhD degree in Denmark and 10 years industry experience in a leading RNAi therapeutic company in China. During those years of experience, he built up a close relationship with Oral Pathology and Oral Medicine. It is great opportunity to introduce his story together with JOPM, accompanying with his personal research experience, at the moment of the 50th Anniversary of JOPM.
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Affiliation(s)
- Shan Gao
- JOPM, Beijing, People's Republic of China.,Suzhou Ribo Life Science Co. Ltd, Suzhou, Jiangsu, People's Republic of China
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2
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Moschny N, Jahn K, Bajbouj M, Maier HB, Ballmaier M, Khan AQ, Pollak C, Bleich S, Frieling H, Neyazi A. DNA Methylation of the t-PA Gene Differs Between Various Immune Cell Subtypes Isolated From Depressed Patients Receiving Electroconvulsive Therapy. Front Psychiatry 2020; 11:571. [PMID: 32636772 PMCID: PMC7319092 DOI: 10.3389/fpsyt.2020.00571] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 06/03/2020] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Major depressive disorder (MDD) represents a tremendous health threat to the world's population. Electroconvulsive therapy (ECT) is the most effective treatment option for refractory MDD patients. Ample evidence suggests brain-derived neurotrophic factor (BDNF) to play a crucial role in ECT's mode of action. Tissue-type plasminogen activator (t-PA) and plasminogen activator inhibitor-1 (PAI-1) are involved in BDNF production. HYPOTHESIS The DNA methylation of gene regions encoding for t-PA and PAI-1 might be a suitable biomarker for ECT response prediction. METHODS We withdrew blood from two cohorts of treatment-resistant MDD patients receiving ECT. In the first cohort (n = 59), blood was collected at baseline only. To evaluate DNA methylation changes throughout the treatment course, we acquired a second group (n = 28) and took blood samples at multiple time points. DNA isolated from whole blood and defined immune cell subtypes (B cells, monocytes, natural killer cells, and T cells) served for epigenetic analyses. RESULTS Mixed linear models (corrected for multiple testing by Sidak's post-hoc test) revealed (1) no detectable baseline blood DNA methylation differences between ECT remitters (n = 33) and non-remitters (n = 53) in the regions analyzed, but (2) a significant difference in t-PA's DNA methylation between the investigated immune cell subtypes instead (p < 0.00001). This difference remained stable throughout the treatment course, showed no acute changes after ECT, and was independent of clinical remission. CONCLUSION DNA methylation of both proteins seems to play a minor role in ECT's mechanisms. Generally, we recommend using defined immune cell subtypes (instead of whole blood only) for DNA methylation analyses.
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Affiliation(s)
- Nicole Moschny
- Laboratory for Molecular Neurosciences, Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience, Hannover Graduate School for Veterinary Pathobiology, Neuroinfectiology, and Translational Medicine (HGNI), Hannover, Germany
| | - Kirsten Jahn
- Laboratory for Molecular Neurosciences, Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Malek Bajbouj
- Department of Psychiatry and Psychotherapy, Charité, Berlin, Germany
| | - Hannah Benedictine Maier
- Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | | | - Abdul Qayyum Khan
- Laboratory for Molecular Neurosciences, Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Christoph Pollak
- Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Stefan Bleich
- Center for Systems Neuroscience, Hannover Graduate School for Veterinary Pathobiology, Neuroinfectiology, and Translational Medicine (HGNI), Hannover, Germany.,Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Helge Frieling
- Laboratory for Molecular Neurosciences, Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany.,Center for Systems Neuroscience, Hannover Graduate School for Veterinary Pathobiology, Neuroinfectiology, and Translational Medicine (HGNI), Hannover, Germany.,Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
| | - Alexandra Neyazi
- Center for Systems Neuroscience, Hannover Graduate School for Veterinary Pathobiology, Neuroinfectiology, and Translational Medicine (HGNI), Hannover, Germany.,Department of Psychiatry, Social Psychiatry and Psychotherapy, Hannover Medical School, Hannover, Germany
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Zou B, Wang D, Xu K, Yuan DY, Meng Z, Zhang B. Integrin α-5 as a potential biomarker of head and neck squamous cell carcinoma. Oncol Lett 2019; 18:4048-4055. [PMID: 31579416 PMCID: PMC6757314 DOI: 10.3892/ol.2019.10773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 06/26/2019] [Indexed: 01/06/2023] Open
Abstract
Head and neck squamous cell carcinoma (HNSCC) is one of the most common malignant tumors that endanger human health. In recent years, the incidence of HNSCC has been increasing, without any significant improvement in the prognosis. Therefore, increased knowledge on the molecular mechanism underlying HNSCC development will allow the development of new strategies for therapy. The present study attempted to identify key genes involved in HNSCC development. Expression profiles of HNSCC and normal samples were downloaded from The Cancer Genome Atlas database. Differentially expressed genes (DEGs) between the HNSCC and normal samples were identified and subjected to Gene Oncology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways analysis. A protein-protein interaction (PPI) network was constructed, and Cytoscape CentiScape and Gene Expression Profiling Interactive Analysis were used to identify key DEGs. Finally, expression profiles of HNSCCs, including 500 HNSCCs and 44 normal samples, were included in the analysis. A total of 1,181 DEGs were screened, among which 354 genes were upregulated and 827 genes were downregulated in HNSCC compared with normal tissues. The GO enrichment analysis showed that the DEGs were mainly involved in chloride transmembrane transporter, metalloendopeptidase and substrate-specific channel activities. The KEGG pathway analysis revealed that the DEGs were mainly associated with ‘protein digestion and absorption’, as well as ‘extracellular matrix-receptor interaction’. Integrin α-5 (ITGA5) was identified as a hub gene, based on the PPI network complex, and was confirmed to be significantly associated with the overall survival rate. Moreover, ITGA5 was overexpressed specifically in HNSCC. The genes found, notably ITGA5, are potential diagnostic biomarkers and therapeutic targets in HNSCC.
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Affiliation(s)
- Bo Zou
- Department of Oral and Maxillofacial Surgery, Liaocheng People's Hospital, Medical College of Liaocheng University, Liaocheng, Shandong 252000, P.R. China.,Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Dong Wang
- Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China.,Precision Biomedical Key Laboratory, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Kai Xu
- Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China.,Precision Biomedical Key Laboratory, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Dao-Ying Yuan
- Department of Oral and Maxillofacial Surgery, Liaocheng People's Hospital, Medical College of Liaocheng University, Liaocheng, Shandong 252000, P.R. China.,Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Zhen Meng
- Department of Oral and Maxillofacial Surgery, Liaocheng People's Hospital, Medical College of Liaocheng University, Liaocheng, Shandong 252000, P.R. China.,Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China.,Precision Biomedical Key Laboratory, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Bin Zhang
- Department of Oral and Maxillofacial Surgery, Liaocheng People's Hospital, Medical College of Liaocheng University, Liaocheng, Shandong 252000, P.R. China.,Key Laboratory of Oral Maxillofacial-Head and Neck Medical Biology of Shandong Province, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China.,Precision Biomedical Key Laboratory, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
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uPA/uPAR and SERPINE1 in head and neck cancer: role in tumor resistance, metastasis, prognosis and therapy. Oncotarget 2018; 7:57351-57366. [PMID: 27385000 PMCID: PMC5302994 DOI: 10.18632/oncotarget.10344] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 06/13/2016] [Indexed: 12/25/2022] Open
Abstract
There is strong evidence supporting the role of the plasminogen activator system in head and neck squamous cell carcinoma (HNSCC), particularly of its uPA (urokinase plasminogen activator) / uPAR (urokinase plasminogen activator receptor) and SERPINE1 components. Overexpression of uPA/uPAR and SERPINE1 enhances tumor cell migration and invasion and plays a key role in metastasis development, conferring poor prognosis. The apparent paradox of uPA/uPAR and its inhibitor SERPINE1 producing similar effects is solved by the identification of SERPINE1 activated signaling pathways independent of uPA inhibition. Both uPA/uPAR and SERPINE1 are directly linked to the induction of epithelial-to-mesenchymal transition, the acquisition of stem cell properties and resistance to antitumor agents. The aim of this review is to provide insight on the deregulation of these proteins in all these processes. We also summarize their potential value as prognostic biomarkers or potential drug targets in HNSCC patients. Concomitant overexpression of uPA/uPAR and SERPINE1 is associated with a higher risk of metastasis and could be used to identify patients that would benefit from an adjuvant treatment. In the future, the specific inhibitors of uPA/uPAR and SERPINE1, which are still under development, could be used to design new therapeutic strategies in HNSCCs.
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Aghbari SMH, Abushouk AI, Shakir OG, Zayed SO, Attia A. Correlation between tissue expression of microRNA-137 and CD8 in oral lichen planus. Clin Oral Investig 2017; 22:1463-1467. [PMID: 29034442 DOI: 10.1007/s00784-017-2252-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 10/10/2017] [Indexed: 01/06/2023]
Abstract
OBJECTIVES Oral lichen planus (OLP) is a chronic, inflammatory condition, classified by the World Health Organization as a premalignant lesion. We performed this study to evaluate the correlation between microRNA-137 (miR-137) and CD8 oral tissue expression in OLP patients. MATERIALS AND METHODS Twenty OLP patients [classified into three groups: (a) papular, reticular, or plaque; (b) atrophic; and (c) erosive] and 20 healthy controls were subjected to biopsy of the oral mucosa. To evaluate CD8 tissue expression, we performed immunohistochemical examination, followed by immunostaining and computerized quantification. The expression of miR-137 was evaluated using real-time quantitative PCR. We used SPSS software (version 15 for windows) to perform the statistical analysis. RESULTS Our analysis showed an increased tissue expression of CD8 (p < 0.01) and reduced expression of miR-137 (p < 0.001) in OLP patients, compared to the control group. Moreover, there was a statistically significant difference (p = 0.001) between OLP subgroups in terms of CD8 tissue expression [highest in erosive OLP and lowest in papular/reticular/plaque OLP]. However, these subgroups showed no significant difference (p = 0.168) in terms of miR-137 expression. A negative correlation (p < 0.05) between tissue expression of miR-137 and CD8 was noted with a varying correlation coefficient in different OLP subgroups (-0.250 in erosive OLP, -0.491 in atrophic OLP and -0.616 in papular/reticular/plaque OLP). CONCLUSIONS Our findings indicate reduced expression of miR-137 and a reverse correlation between tissue expression of miR-137 and CD8 in the oral mucosa of OLP patients. CLINICAL RELEVANCE Future studies should investigate the therapeutic potential of miR-137 overexpression in OLP patients.
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Affiliation(s)
| | | | | | | | - Attia Attia
- Faculty of Medicine, Al-Azhar University, Cairo, Egypt
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Basu B, Chakraborty J, Chandra A, Katarkar A, Baldevbhai JRK, Dhar Chowdhury D, Ray JG, Chaudhuri K, Chatterjee R. Genome-wide DNA methylation profile identified a unique set of differentially methylated immune genes in oral squamous cell carcinoma patients in India. Clin Epigenetics 2017; 9:13. [PMID: 28174608 PMCID: PMC5292006 DOI: 10.1186/s13148-017-0314-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 01/19/2017] [Indexed: 01/06/2023] Open
Abstract
Background Oral squamous cell carcinoma (OSCC) is one of the common malignancies in Southeast Asia. Epigenetic changes, mainly the altered DNA methylation, have been implicated in many cancers. Considering the varied environmental and genotoxic exposures among the Indian population, we conducted a genome-wide DNA methylation study on paired tumor and adjacent normal tissues of ten well-differentiated OSCC patients and validated in an additional 53 well-differentiated OSCC and adjacent normal samples. Results Genome-wide DNA methylation analysis identified several novel differentially methylated regions associated with OSCC. Hypermethylation is primarily enriched in the CpG-rich regions, while hypomethylation is mainly in the open sea. Distinct epigenetic drifts for hypo- and hypermethylation across CpG islands suggested independent mechanisms of hypo- and hypermethylation in OSCC development. Aberrant DNA methylation in the promoter regions are concomitant with gene expression. Hypomethylation of immune genes reflect the lymphocyte infiltration into the tumor microenvironment. Comparison of methylome data with 312 TCGA HNSCC samples identified a unique set of hypomethylated promoters among the OSCC patients in India. Pathway analysis of unique hypomethylated promoters indicated that the OSCC patients in India induce an anti-tumor T cell response, with mobilization of T lymphocytes in the neoplastic environment. Survival analysis of these epigenetically regulated immune genes suggested their prominent role in OSCC progression. Conclusions Our study identified a unique set of hypomethylated regions, enriched in the promoters of immune response genes, and indicated the presence of a strong immune component in the tumor microenvironment. These methylation changes may serve as potential molecular markers to define risk and to monitor the prognosis of OSCC patients in India. Electronic supplementary material The online version of this article (doi:10.1186/s13148-017-0314-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Baidehi Basu
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata, 700108 India
| | - Joyeeta Chakraborty
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata, 700108 India
| | - Aditi Chandra
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata, 700108 India
| | - Atul Katarkar
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata, 700108 India.,Molecular Genetics Division, CSIR-Indian Institute of Chemical biology, 4 Raja S C Mullick Road, Kolkata, 700 032 India
| | | | | | - Jay Gopal Ray
- Dr. R Ahmed Dental College & Hospital, 114, A J C Bose Road, Kolkata, India
| | - Keya Chaudhuri
- Molecular Genetics Division, CSIR-Indian Institute of Chemical biology, 4 Raja S C Mullick Road, Kolkata, 700 032 India
| | - Raghunath Chatterjee
- Human Genetics Unit, Indian Statistical Institute, 203 B. T. Road, Kolkata, 700108 India
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Gao S, Hein S, Dagnæs-Hansen F, Weyer K, Yang C, Nielsen R, Christensen EI, Fenton RA, Kjems J. Megalin-mediated specific uptake of chitosan/siRNA nanoparticles in mouse kidney proximal tubule epithelial cells enables AQP1 gene silencing. Am J Cancer Res 2014; 4:1039-51. [PMID: 25157280 PMCID: PMC4142293 DOI: 10.7150/thno.7866] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 02/28/2014] [Indexed: 12/05/2022] Open
Abstract
RNAi-based strategies provide a great therapeutic potential for treatment of various human diseases including kidney disorders, but face the challenge of in vivo delivery and specific targeting. The chitosan delivery system has previously been shown to target siRNA specifically to the kidneys in mice when administered intravenously. Here we confirm by 2D and 3D bioimaging that chitosan formulated siRNA is retained in the kidney for more than 48 hours where it accumulates in proximal tubule epithelial cells (PTECs), a process that was strongly dependent on the molecular weight of chitosan. Chitosan/siRNA nanoparticles, administered to chimeric mice with conditional knockout of the megalin gene, distributed almost exclusively in cells that expressed megalin, implying that the chitosan/siRNA particle uptake was mediated by a megalin-dependent endocytotic pathway. Knockdown of the water channel aquaporin 1 (AQP1) by up to 50% in PTECs was achieved utilizing the systemic i.v. delivery of chitosan/AQP1 siRNA in mice. In conclusion, specific targeting PTECs with the chitosan nanoparticle system may prove to be a useful strategy for knockdown of specific genes in PTECs, and provides a potential therapeutic strategy for treating various kidney diseases.
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Lara PC, Lloret M, Valenciano A, Clavo B, Pinar B, Rey A, Henríquez-Hernández LA. Plasminogen activator inhibitor-1 (PAI-1) expression in relation to hypoxia and oncoproteins in clinical cervical tumors. Strahlenther Onkol 2012; 188:1139-45. [PMID: 23111469 DOI: 10.1007/s00066-012-0216-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 07/16/2012] [Indexed: 10/27/2022]
Abstract
PURPOSE Explore the role of plasminogen activator inhibitor-1 (PAI-1) in cervical cancer and its relationship to hypoxia and the expression of p53, Ku70/80, and cyclin D1. MATERIAL AND METHODS The expression of PAI-1, cyclin D1, and p53, together with tumor oxygenation, were determined in 43 consecutive patients suffering from localized cervical carcinoma. Oncoprotein expression was determined by immunohistochemistry. Tumor oxygenation was measured using a polarographic probe system, "pO2 histography." RESULTS PAI expression was considered negative in 32.6% and overexpressed in 18.6% of cases. Cyclin D1 showed a median expression of 5.0 (range 0-70). We observed a positive association between PAI expression and altered p53 (p = 0.049) and cyclin D1 (p = 0.020). An inverse association was detected between PAI and Ku70/80 expression (p = 0.042). Cyclin D1 staining increased according to tumor volume (r = 0.314, p = 0.009). We did not observe a significant association between PAI and hypoxia or other clinicopathological parameters. CONCLUSION The present results show that PAI-1 overexpression is associated with nonhomologous end-joining DNA repair down-regulation (low Ku70/80 expression) and with increased p53 and cyclin D1 expression, and they suggest that PAI-1 plays a role in the tumor behavior in cervical carcinoma.
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Affiliation(s)
- P C Lara
- Hospital Universitario de Gran Canaria Dr. Negrín, Las Palmas de Gran Canaria, Las Palmas, Spain
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Park D, Kim Y, Kim H, Kim K, Lee YS, Choe J, Hahn JH, Lee H, Jeon J, Choi C, Kim YM, Jeoung D. Hyaluronic acid promotes angiogenesis by inducing RHAMM-TGFβ receptor interaction via CD44-PKCδ. Mol Cells 2012; 33:563-74. [PMID: 22610405 PMCID: PMC3887750 DOI: 10.1007/s10059-012-2294-1] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Revised: 04/06/2012] [Accepted: 04/23/2012] [Indexed: 12/12/2022] Open
Abstract
Hyaluronic acid (HA) has been shown to promote angiogenesis. However, the mechanism behind this effect remains largely unknown. Therefore, in this study, the mechanism of HA-induced angiogenesis was examined. CD44 and PKCδ were shown to be necessary for induction of the receptor for HA-mediated cell motility (RHAMM), a HA-binding protein. RHAMM was necessary for HA-promoted cellular invasion and endothelial cell tube formation. Cytokine arrays showed that HA induced the expression of plasminogen activator-inhibitor-1 (PAI), a downstream target of TGFβ receptor signaling. The induction of PAI-1 was dependent on CD44 and PKCδ. HA also induced an interaction between RHAMM and TGFβ receptor I, and induction of PAI-1 was dependent on RHAMM and TGFβ receptor I. Histone deacetylase 3 (HDAC3), which is decreased by HA via rac1, reduced induction of plasminogen activator inhibitor-1 (PAI-1) by HA. ERK, which interacts with RHAMM, was necessary for induction of PAI-1 by HA. Snail, a downstream target of TGFβ signaling, was also necessary for induction of PAI-1. The down regulation of PAI-1 prevented HA from enhancing endothelial cell tube formation and from inducing expression of angiogenic factors, such as ICAM-1, VCAM-1 and MMP-2. HDAC3 also exerted reduced expression of MMP-2. In this study, we provide a novel mechanism of HA-promoted angiogenesis, which involved RHAMM-TGFβRI signaling necessary for induction of PAI-1.
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Affiliation(s)
- Deokbum Park
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
| | - Youngmi Kim
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
| | - Hyunah Kim
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
| | - kyungjong Kim
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
| | - Yun-Sil Lee
- College of Pharmacy, Ewha Womans University, Seoul 120-750,
Korea
| | - Jongseon Choe
- School of Medicine, Kangwon National University, Chunchon 200-701,
Korea
| | - Jang-Hee Hahn
- School of Medicine, Kangwon National University, Chunchon 200-701,
Korea
| | - Hansoo Lee
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
| | - Jongwook Jeon
- Cell Signaling and BioImaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701,
Korea
| | - Chulhee Choi
- Cell Signaling and BioImaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701,
Korea
| | - Young-Myeong Kim
- School of Medicine, Kangwon National University, Chunchon 200-701,
Korea
| | - Dooil Jeoung
- School of Biological Sciences, College of Natural Sciences, Kangwon National University, Chuncheon 200-701,
Korea
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Surgical removal of the parametrial fat pads stimulates apoptosis and inhibits UVB-induced carcinogenesis in mice fed a high-fat diet. Proc Natl Acad Sci U S A 2012; 109:9065-70. [PMID: 22615388 DOI: 10.1073/pnas.1205810109] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Removal of the parametrial fat pads (partial lipectomy) from female SKH-1 mice fed a high-fat diet inhibited UVB-induced carcinogenesis, but this was not observed in mice fed a low-fat chow diet. Partial lipectomy in high-fat-fed mice decreased the number of keratoacanthomas and squamous cell carcinomas per mouse by 76 and 79%, respectively, compared with sham-operated control mice irradiated with UVB for 33 wk. Immunohistochemical analysis indicated that partial lipectomy increased caspase 3 (active form) positive cells by 48% in precancerous epidermis away from tumors, by 68% in keratoacanthomas, and by 224% in squamous cell carcinomas compared with sham-operated control mice. In addition, partial lipectomy decreased cell proliferation away from tumors and in tumors. RT-PCR analysis for adipokines revealed that mRNAs for TIMP1, MCP1, and SerpinE1 (proinflammatory/antiapoptotic cytokines) in the parametrial fat pads of sham-operated control mice were 54- to 83-fold higher than levels in compensatory fat that returned after surgery in partially lipectomized mice at the end of the tumor study. Feeding mice high-fat diets for 2 wk increased levels of TIMP1 and other adipokines in serum and epidermis, and these increases were inhibited by removal of the parametrial fat pads. Our results are a unique demonstration that surgical removal of a specific tissue fat results in inhibition of carcinogenesis in obese mice. This inhibition was associated with an increase in apoptosis and a decrease in proliferation in tumors and in precancerous areas away from tumors.
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Gao S, Andreasen PA. DNA Methylation Profiles of Protease Nexin 1 (SERPINE2) Gene in Human Cell Lines. Chin J Cancer Res 2011; 23:92-8. [PMID: 23482841 DOI: 10.1007/s11670-011-0092-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 03/11/2011] [Indexed: 11/30/2022] Open
Abstract
OBJECTIVE To investigated whether epigenetic mechanisms contribute to the variable expression of variable protease nexin1(PN-1) encoded by the SERPINE2 gene in different cell types. METHODS Working with 5 human cell lines, we determined the CpG methylation status within two CpG islands in the SERPINE2 gene by bisulphate sequencing and the PN-1 mRNA level by Q-RT PCR. RESULTS A CpG island spanning the transcription initiation site showed little methylation in 3 of the cell lines and substantial methylation in 2 of the cell lines. A CpG island covering the translation starting site showed full methylation in all investigated cell lines. Methylation within the CpG island was not randomly distributed, but showed accumulation at specific sites. However, we were not able to distinguish any patterns which related the methylation frequency to the gene expression level. Inhibition of CpG methylation with 5-aza-2'-deoxycytidine led to a several fold increase in PN-1 mRNA levels, but based on the results on CpG methylation in the CpG island spanning the transcript, the effect is most likely indirect. CONCLUSION We have carefully mapped the CpG methylation pattern in two CpG islands in the 5' part of the SERPINE2 gene without finding any obvious inverse correlation between methylation frequency and expression level.
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Affiliation(s)
- Shan Gao
- Danish-Chinese Centre for Proteases and Cancer, Department of Molecular Biology, University of Aarhus, 8000 Aarhus C, Denmark
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