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• W2076689621 endingPage "1304" @default.
• W2076689621 startingPage "1295" @default.
• W2076689621 abstract "The effects of low density lipoprotein (LDL) and high density lipoprotein (HDL3) on second messenger systems were investigated in cultured human vascular smooth muscle cells (VSMC) and compared with those of angiotensin II (Ang II) and platelet-derived growth factor (PDGF-BB). Phosphoinositide metabolism was studied in myo-[2-3H]-inositol prelabelled VSMC using high performance liquid anionexchange chromatography. The spectra of inositol phosphate isomers increased after stimulation with either Ang II, LDL, HDL3, or PDGF-BB were qualitatively identical. Major increases occurred in 4-IP1, 1,4-IP2, 1,3,4-IP3 and 1,3,4,5-IP4. These are metabolic conversion products of 1,4,5-IP3 for which only a minor increase was found. Thus lipoproteins, like Ang II and PDGF-BB, activate polyphosphatidylinositol-specific phospholipase C. Intracellular Ca2+ concentrations ([Ca2+]ii) were studied in fura-2 loaded VSMC. In monolayer cultures LDL and HDL3 increased [Ca2+]i with kinetics comparable to those for Ang II. Relative to the effects of these agonists, the PDGF-BB-induced increase in [Ca2+]i was slower in onset and the decay from peak [Ca2+]i levels more gradual. Fluorescence recordings from single cells exposed to LDL and HDL3 revealed a prolonged series of transient oscillations of [Ca2+]i, a phenomenon typical for calcium-mobilizing hormones. Additionally, as found for Ang II, preincubation of VSMC with either phorbol 12-myristate, 13-acetate, forskolin or 8-bromo-cyclic GMP inhibited LDL, and HDL-induced accumulation of [3H]-inositol monophosphate. We propose that LDL and HDL3 stimulate signal transduction in VSMC via mechanisms analogous to those of C2+-mobilizing hormones." @default.
• W2076689621 created "2016-06-24" @default.
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• W2076689621 date "1992-11-01" @default.
• W2076689621 modified "2023-10-16" @default.
• W2076689621 title "Phosphoinositide and calcium signalling responses in smooth muscle cells: Comparison between lipoproteins, Ang II, and PDGF" @default.
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• W2076689621 doi "https://doi.org/10.1016/0006-291x(92)91372-w" @default.
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• W2076689621 hasPublicationYear "1992" @default.
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