High-density lipoprotein exerts vasculoprotection via endothelial progenitor cells.

Journal of Cellular and Molecular Medicine
Vasileios PetoumenosNikos Werner

Abstract

Endothelial progenitor cells (EPC) enhance endothelial cell repair, improve endothelial dysfunction and are a predictor for cardiovascular mortality. High-density lipoprotein (HDL) cholesterol levels inversely correlate with cardiovascular events and have vasculoprotective effects. Here we postulate that HDL influences EPC biology. HDL and EPC were isolated according to standard procedures. Differentiation of mononuclear cells into DiLDL/lectin positive cells was enhanced after HDL treatment compared to vehicle. HDL was able to inhibit apoptosis (TUNEL assay, annexin V staining) while proliferation (BrdU incorporation) of early outgrowth colonies after extended cell cultivation (14 days) was increased. Flow chamber experiments revealed an improved adhesion of HDL pre-incubated EPC on human coronary artery endothelial cells (HCAEC) compared to vehicle while HDL treatment of HCAEC prevented adhesion of inflammatory cells. Flow cytometry demonstrated an up-regulation of beta2- and alpha4-integrins on HDL pre-incubated EPC. Blocking experiments revealed a unique role of beta2-integrin in EPC adhesion. Treatment of wild-type mice with recombinant HDL after endothelial denudation resulted in enhanced re-endothelialization compared to...Continue Reading

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Methods Mentioned

BETA
PCR
FACS
flow cytometry
GTPase

Software Mentioned

Cellquest
CellQuestPro
AxioVision
Dimension

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