Cited by 186MicroRNA in disease regulationEpigenetics and DNA MethylationGenomics and Chromatin Dynamics

Enhanced Levels of microRNA-125b in Vascular Smooth Muscle Cells of Diabetic db/db Mice Lead to Increased Inflammatory Gene Expression by Targeting the Histone Methyltransferase Suv39h1

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Villeneuve, Louisa M., Kato, Mitsuo, Reddy, Marpadga A., Wang, Mei, Lanting, Linda, Natarajan, Rama·2010·Diabetes

Abstract

OBJECTIVE: Diabetes remains a major risk factor for vascular complications that seem to persist even after achieving glycemic control, possibly due to “metabolic memory.” Using cultured vascular smooth muscle cells (MVSMC) from type 2 diabetic db/db mice, we recently showed that decreased promoter occupancy of the chromatin histone H3 lysine-9 methyltransferase Suv39h1 and the associated repressive epigenetic mark histone H3 lysine-9 trimethylation (H3K9me3) play key roles in sustained inflammatory gene expression. Here we examined the role of microRNAs (miRs) in Suv39h1 regulation and function in MVSMC from diabetic mice. RESEARCH DESIGN AND METHODS: We used luciferase assays with Suv39h1 3′untranslated region (UTR) reporter constructs and Western blotting of endogenous protein to verify that miR-125b targets Suv39h1. We examined the effects of Suv39h1 targeting on inflammatory gene expression by quantitative real time polymerase chain reaction (RT-qPCR), and H3K9me3 levels at their promoters by chromatin immunoprecipitation assays. RESULTS: We observed significant upregulation of miR-125b with parallel downregulation of Suv39h1 protein (predicted miR-125b target) in MVSMC cultured from diabetic db/db mice relative to control db/+. miR-125b mimics inhibited both Suv39h1 3′UTR luciferase reporter activity and endogenous Suv39h1 protein levels. Conversely, miR-125b inhibitors showed opposite effects. Furthermore, miR-125b mimics increased expression of inflammatory genes, monocyte chemoattractant protein-1, and interleukin-6, and reduced H3K9me3 at their promoters in nondiabetic cells. Interestingly, miR-125b mimics increased monocyte binding to db/+ MVSMC toward that in db/db MVSMC, further imitating the proinflammatory diabetic phenotype. In addition, we found that the increase in miR-125b in db/db VSMC is caused by increased transcription of miR-125b-2. CONCLUSIONS: These results demonstrate a novel upstream role for miR-125b in the epigenetic regulation of inflammatory genes in MVSMC of db/db mice through downregulation of Suv39h1.

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  • Hyperglycemia increases the expression of several microRNAs found in the endothelium, including miR-320, miR-221, miR-503, and miR-125b.

    “Hyperglycemia increases the expression of several microRNAs found in the endothelium, including miR-320, miR-221, miR-503, and miR-125b.”

    From The Vasculature in Prediabetes (2018) · cites this paper as [147]

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Authors
Villeneuve, L. M., Kato, M., Reddy, M. A., Wang, M., Lanting, L., & Natarajan, R.
Affiliations
City Of Hope National Medical Center (US)
Corresponding author
Natarajan, Rama
Venue
Diabetes
Published
2010-08-10
Volume
59
Issue
11
Pages
2904-2915
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2130330362
Cited by
186
References
55
Citations by year
2026: 4 · 2025: 3 · 2024: 5 · 2023: 3 · 2022: 11 · 2021: 11 · 2020: 6 · 2019: 13 · 2018: 11 · 2017: 16 · 2016: 15 · 2015: 18 · 2014: 18 · 2013: 21 · 2012: 15
FWCI
5.24
Type
journal article
Language
en
Open access
Locations
  • Diabetes (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • American Diabetes Association
  • Beckman Research Institute, City of Hope
  • National Institutes of Health
  • Directorate for Biological Sciences
  • National Heart, Lung, and Blood Institute (R01HL087864)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK065073)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
SUV39H1, histone H3 lysine 9 trimethylation, vascular smooth muscle cells, diabetic vascular complications, metabolic memory, type 2 diabetes, db/db mice, inflammatory gene expression, monocyte chemotaxis, interleukin-6, MCP-1
MeSH terms
Histone Methyltransferases, Animals, Diabetes Mellitus, Type 2, Gene Expression Regulation, Humans, Inflammation, Methyltransferases, Muscle, Smooth, Vascular, Promoter Regions, Genetic, Histone-Lysine N-Methyltransferase, Repressor Proteins, Blotting, Western, Down-Regulation, Up-Regulation, Gene Expression Regulation, Enzymologic, Genes, Reporter, 3' Untranslated Regions, MicroRNAs, Mice

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