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• W2076376481 abstract "Hyperlipidemia may contribute to the pathogenesis of glomerular sclerosis. We therefore studied binding and uptake of low density lipoprotein (LDL) by cultured rat mesangial cells. In addition effects of LDL on PGE2 synthesis and cell proliferation were determined. At 4 degrees C mesangial cells bound [125I] LDL in a time- and concentration-dependent manner with half-maximal binding observed at 5 micrograms/ml of LDL protein. Binding was blocked by excess unlabeled LDL and by heparin. Uptake (binding plus internalization) of LDL at 37 degrees C markedly exceeded binding at 4 degrees C, continued to increase even with longer periods of incubation, and showed no saturability, consistent with uptake of LDL by mesangial cells. Further evidence for LDL uptake by mesangial cells was obtained by use of the fluorescent probe 1,1'-dioactadecyl-3,3,3', 3'-tetramethylindocarbocyanine perchlorate-labeled LDL (Dil-LDL). Incubation of mesangial cells with Dil-LDL at 37 degrees C showed positive fluorescence for all mesangial cells, indicating uptake of the Dil-LDL. LDL had a biphasic effect on mesangial cell proliferation as determined by [3H] thymidine incorporation. LDL at 10 micrograms/ml enhanced [3H] thymidine uptake modestly, but significantly, whereas a progressive and marked inhibition occurred at LDL concentration from 100 to 500 micrograms/ml. While LDL at 10 and 100 micrograms/ml significantly stimulated PGE2 production, inhibition of PGE2 by meclofenamate did not influence the effects of LDL on [3H] thymidine incorporation. We conclude that mesangial cells show specific binding and uptake of LDL and that high concentrations of LDL markedly decrease mesangial cell proliferation. These findings may pertain to the pathogenesis of glomerular lesions in hyperlipidemia of renal disease." @default.
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• W2076376481 date "1989-05-01" @default.
• W2076376481 modified "2023-10-16" @default.
• W2076376481 title "Interactions of low density lipoprotein with rat mesangial cells" @default.
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• W2076376481 doi "https://doi.org/10.1038/ki.1989.106" @default.
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