Interaction of human endothelial cells with elevated glucose concentrations and native and glycosylated low density lipoproteins.

Abstract:

:We have investigated whether and how the elevated glucose concentrations characteristic of diabetes may alter the interaction of endothelial cells with low-density lipoproteins (LDL). Protracted exposure of cultured human endothelial cells to 20 mmol/l glucose failed to affect either the relationship between the degree of confluency of the monolayer and the extent of LDL degradation or the dose-responses for LDL uptake and degradation. In contrast, non-enzymatic glycosylation of LDL by pre-incubation of LDL with glucose markedly inhibited their uptake and degradation by endothelial cells. Thus, at protein concentration of 5 micrograms/ml, the amount of glycosylated 125I-LDL associated with cells was decreased fourfold compared with native 125I-LDL (47 +/- 3 versus 194 +/- 10 ng X mg cell protein-1 X 24 h-1, mean +/- SEM), and degradation was decreased twenty-fold (135 +/- 4 versus 2873 +/- 115 ng X mg cell protein-1 X 24 h-1). The degree of inhibition was proportional to the extent of glycosylation. At all concentrations studied, methylated LDL behaved similarly to glycosylated LDL. The decreased recognition of glycosylated LDL by the endothelial lining of small and large blood vessels may have an impact of tissue physiology and on the overall fate of the glycosylated molecules.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Lorenzi M,Cagliero E,Markey B,Henriksen T,Witztum JL,Sampietro T

doi

10.1007/BF00252411

subject

Has Abstract

pub_date

1984-03-01 00:00:00

pages

218-22

issue

3

eissn

0012-186X

issn

1432-0428

journal_volume

26

pub_type

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    pub_type: 临床试验,杂志文章,随机对照试验

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