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Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
07:29

Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein

Published on: October 12, 2017

Diabetic HDL is dysfunctional in stimulating endothelial cell migration and proliferation due to down regulation of

Bing Pan1, Yijing Ma, Hui Ren

  • 1The Institute of Cardiovascular Sciences, Ministry of Education, Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health, Peking University Health Science Center, Beijing, China.

Plos One
|November 8, 2012
PubMed

Insights

Diabetic high-density lipoprotein (HDL) dysfunction impairs endothelial cell function due to reduced SR-BI receptor levels. This downregulation affects cell proliferation, migration, and chronic Akt activation.

Area of Science:

  • Cardiovascular Biology
  • Endocrinology
  • Lipid Metabolism

Background:

  • Diabetic high-density lipoprotein (HDL) exhibits reduced capacity to stimulate endothelial cell (EC) proliferation, migration, and adhesion.
  • The underlying mechanisms of diabetic HDL dysfunction remain incompletely understood.

Purpose of the Study:

  • To investigate the mechanistic features contributing to diabetic HDL dysfunction.
  • To elucidate the role of the HDL receptor scavenger receptor class B type 1 (SR-BI) in diabetic HDL's effects on ECs.

Main Methods:

  • Assessed the impact of normal and diabetic HDL on human umbilical vein endothelial cells (HUVECs) and mouse aortic endothelial cells (MAECs).
  • Investigated the expression and function of SR-BI in ECs treated with different HDL types.
  • Analyzed Akt phosphorylation in response to HDL treatment over time.

Main Results:

  • Diabetic HDL-induced endothelial dysfunction was associated with decreased SR-BI protein levels.
  • SR-BI downregulation significantly impaired the proliferative and migratory effects of normal HDL on MAECs.
  • While both normal and diabetic HDL induced acute Akt phosphorylation, diabetic HDL showed reduced chronic Akt activation, linked to SR-BI downregulation.

Conclusions:

  • Diabetic HDL dysfunction in promoting EC proliferation, migration, and adhesion is linked to SR-BI downregulation.
  • Reduced SR-BI expression diminishes diabetic HDL's capacity for chronic Akt activation, contributing to endothelial dysfunction.
Abstract

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