Apolipoprotein A-I Inhibits Transendothelial Transport of Apolipoprotein B-Carrying Lipoproteins and Enhances Its Associated High-Density Lipoprotein Formation

Overview

Journal J Vasc Res

Specialty Cardiology & Vascular Diseases

Date 2022 Jun 27

PMID 35760057

Authors

Zhongmao Guo

Ningya Zhang

Hong Yang

Affiliations

Soon will be listed here.

Abstract

Caveola-located scavenger receptor type B class I (SR-BI) and activin receptor-like kinase-1 (ALK1) are involved in transendothelial transport of apolipoprotein B-carrying lipoproteins (apoB-LPs). Transport of apoB-LPs though mouse aortic endothelial cells (MAECs) is associated with apoE-carrying high-density lipoprotein (HDL)-like particle formation and apoAI induces raft-located proteins to shift to non-raft membranes by upregulation of ATP-binding cassette transporter A1 (ABCA1). To investigate apoAI's effect on transendothelial transport of apoB-LPs, MAECs and human coronary artery endothelial cells (HCAECs) were treated with apoB-LPs ± apoAI. Our data demonstrated that apoAI neither altered SR-BI and ALK1 expression nor affected apoB-LP binding to MAECs. ApoAI inhibited MAEC uptake, transcellular transport, and intracellular accumulation of apoB-LPs and accelerated their resecretion in MAECs. ApoAI enhanced transendothelial apoB-LP transport-associated HDL-like particle formation, upregulated ABCA1 expression, shifted SR-BI and ALK1 to the non-raft membrane in MAECs, inhibited transcellular transport of apoB-LPs, and enhanced associated HDL-like particle formation in HCAECs. ABCA1 knockdown attenuated apoAI-induced membrane SR-BI and ALK1 relocation and diminished apoAI's effect on transendothelial apoB-LP transport and HDL-like particle formation in MAECs. This suggests that upregulation of ABCA1 expression is a mechanism, whereby apoAI provokes caveola-located receptor relocation, inhibits transendothelial apoB-LP transport, and promotes associated HDL-like particle formation.

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