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Related Concept Videos

Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

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Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility,...
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Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy
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MicroRNAs in Hyperglycemia Induced Endothelial Cell Dysfunction.

Maskomani Silambarasan1, Jun Rong Tan2, Dwi Setyowati Karolina3

  • 1Department of Biochemistry, NUS Medicine, National University of Singapore, Singapore 117596, Singapore. m.s19@nus.edu.sg.

International Journal of Molecular Sciences
|April 13, 2016
PubMed
Summary
This summary is machine-generated.

High blood sugar (hyperglycemia) damages blood vessels by altering microRNA (miRNA) expression in endothelial cells. This study identifies specific miRNAs linked to hyperglycemia-induced endothelial dysfunction and apoptosis, crucial for diabetes complications.

Keywords:
apoptosisdiabetes mellitusendothelial dysfunctionhyperglycemiamicroRNA

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Area of Science:

  • Endocrinology and Metabolism
  • Molecular Biology
  • Vascular Biology

Background:

  • Hyperglycemia is a hallmark of prediabetes and Type 2 Diabetes Mellitus.
  • It significantly elevates the risk of severe vascular complications, including retinopathy, nephropathy, and cardiovascular diseases.
  • Endothelial cells are particularly vulnerable to hyperglycemic conditions, leading to dysfunction.

Purpose of the Study:

  • To investigate microRNA (miRNA) expression changes in human umbilical vein endothelial cells under varying glucose concentrations and time points.
  • To establish a correlation between hyperglycemia-induced endothelial dysfunction and specific miRNA expression profiles.
  • To identify miRNAs involved in endothelial cell dysfunction and apoptosis.

Main Methods:

  • Human umbilical vein endothelial cells were exposed to diverse glucose concentrations (5, 10, 25, 40 mM) over several time intervals (6, 12, 24, 48 h).
  • miRNA microarray analysis was employed to profile miRNA expression.
  • In silico pathway analysis was performed on altered miRNA expression data.

Main Results:

  • A clear correlation was observed between hyperglycemia, endothelial dysfunction, and altered miRNA expression.
  • Ten specific miRNAs (miR-26a-5p, -26b-5p, -29b-3p, -29c-3p, -125b-1-3p, -130b-3p, -140-5p, -192-5p, -221-3p, -320a) showed increased expression with rising glucose levels.
  • Seven of these miRNAs (-29b-3p, -29c-3p, -125b-1-3p, -130b-3p, -221-3p, -320a, -192-5p) were strongly associated with endothelial cell apoptosis.

Conclusions:

  • Hyperglycemia significantly impacts miRNA expression in endothelial cells, contributing to their dysfunction.
  • The identified miRNAs represent potential biomarkers and therapeutic targets for managing hyperglycemia-related vascular complications.
  • Targeting these specific miRNAs may offer a novel strategy to mitigate endothelial cell apoptosis and vascular damage in diabetes.