当前位置： SCI文献检索 > BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS期刊下所有文献 > Angiotensin II injection into mice increases the uptake of oxidized LDL by their macrophages via a proteoglycan-mediated pathway.

Angiotensin II injection into mice increases the uptake of oxidized LDL by their macrophages via a proteoglycan-mediated pathway.

Abstract：

:Angiotensin II (Ang-II) has been shown to possess several atherogenic properties including its ability to induce macrophage-mediated oxidation of LDL and to form Ang-II-modified LDL which is taken up by macrophages at enhanced rate. Oxidized-LDL (Ox-LDL) is also taken up by macrophages at enhanced rate via several scavenger receptors, leading to macrophage cholesterol accumulation. In the present study we examined the effect of Ang-II on the uptake of Ox-LDL by peritoneal macrophages derived from Balb/c mice (MPM). Intraperitoneal injection of Ang-II (10(-7) M, once daily for a period of 2 days) to the mice resulted in an increased Ox-LDL uptake up to 60%, in comparison to macrophages from placebo-treated mice. Similar results were obtained when Ang-II (10(-7) M) was injected to the mice twice a week for a period of three months. This Ox-LDL uptake was Ang-II dose-dependent. The cellular uptake of acetylated-LDL (Ac-LDL), another ligand for scavenger receptors, however, was not affected by Ang-II injection to the mice. Furthermore, preincubation of the MPM with the monoclonal antibody, anti CD36, reduced macrophage uptake of Ox-LDL in Ang-II-treated mice by only 11%. Ang-II administration to mice resulted in a 60% increase in the macrophage cellular proteoglycan content. Chondroitinase treatment of MPM decreased Ox-LDL cellular uptake by 20% and by 38% in placebo-treated and Ang-II-treated cells, respectively. We thus conclude that Ang-II administration to mice enhances their macrophage Ox-LDL uptake via its stimulating effect on cellular proteoglycan content and this process can lead to foam cell formation and atherosclerosis.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Keidar S,Attias J

doi

10.1006/bbrc.1997.7428

subject

Has Abstract

pub_date

1997-10-09 00:00:00

pages

63-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(97)97428-3

journal_volume

239

pub_type

杂志文章

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