A new contributor to atherosclerosis

blood pressure
Credit: CC0 Public Domain

Free radicals produced during oxidative stress react with membrane fatty acids to yield highly reactive lipid aldehydes, which can modify proteins and cause cellular or tissue damage.

The aldehyde HNE has been shown to modify (HDL, the so-called good cholesterol) and contribute to atherosclerosis. Another aldehyde, called ONE, is produced at the same time as HNE, but its role is unknown.

Linda May-Zhang, Ph.D., Sean Davies, Ph.D., and colleagues have now found that patients with familial hypercholesterolemia, a genetic disorder characterized by high blood cholesterol, have higher levels of ONE-modified HDL compared to healthy controls. They identified the amino acids that ONE targets and showed that ONE modification reduces HDL's ability to protect against inflammation. ONE modification did not alter HDL's ability to promote cholesterol efflux from macrophages.

The findings, reported in the Dec. 13 issue of the Journal of Biological Chemistry, demonstrate that ONE impairs HDL function and that ONE-HDL adducts are elevated in atherosclerosis.

Explore further

Scavengers "protect" HDL

More information: Linda S. May-Zhang et al. Modified sites and functional consequences of 4-oxo-2-nonenal adducts in HDL that are elevated in familial hypercholesterolemia, Journal of Biological Chemistry (2019). DOI: 10.1074/jbc.RA119.009424
Journal information: Journal of Biological Chemistry

Citation: A new contributor to atherosclerosis (2020, January 31) retrieved 31 July 2021 from https://medicalxpress.com/news/2020-01-contributor-atherosclerosis.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments