Preferential binding of oxidized LDL to rat glomeruli in vivo and cultured mesangial cells in vitro View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1991-05

AUTHORS

George Coritsidis, Vincent Rifici, Salil Gupta, Jonathan Rie, Zihe Shan, Joel Neugarten, Detlef Schlondorff

ABSTRACT

Hyperlipidemia may contribute to the pathogenesis of glomerular sclerosis. We therefore compared binding and uptake of native LDL and oxidized LDL (Ox-LDL) to cultured mesangial cells (MC) and the resulting effects on prostaglandin generation and cell proliferation. Ox-LDL, prepared from native LDL by incubation with copper, was bound to MC in a concentration dependent manner with a four- to fivefold increase in binding over LDL. In competition binding experiments Ox-LDL competed to 90% with LDL for binding sites, but LDL only displaced Ox-LDL to 15%. Furthermore polyinosinic acid, which blocks binding of Ox-LDL to macrophages, inhibited binding of Ox-LDL but not that of LDL to MC. Mesangial cells also preferentially took up Ox-LDL over LDL, and Ox-LDL resulted in higher [14C] oleate incorporation into cholesteryl esters than LDL, findings consistent with different handling of Ox-LDL and LDL by MC. LDL slightly stimulated mesangial cell proliferation at low concentration (10 to 50 micrograms/ml of LDL) returning to control levels at 100 and 250 micrograms/ml. In contrast Ox-LDL inhibited cell proliferation in a concentration-dependent manner, starting at concentrations as low as 10 to 25 micrograms/ml of Ox-LDL. Direct observations of mesangial cells by phase contrast microscopy confirmed the cytotoxic effects of Ox-LDL. Addition of Ox-LDL to mesangial cells resulted in a concentration-dependent increase in PGE2 synthesis within one hour, while at this time point LDL had no significant effect.(ABSTRACT TRUNCATED AT 250 WORDS) More... »

PAGES

858-866

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ki.1991.108

DOI

http://dx.doi.org/10.1038/ki.1991.108

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PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/2067202


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