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• W2026054080 abstract "When rat renal mesangial cells (RMC) or vascular smooth muscle cells are released from quiescence by serum stimulation they express c-fos mRNA transiently at 30 to 60 minutes and progress in synchrony to S phase. Heparin causes significant suppression of [3H]-thymidine incorporation into DNA in S phase and a decrease and delay of entry of cells into S/G2. Added at the time of serum stimulation, heparin (1 microgram/ml or less) causes a decrease in the subsequent expression of c-fos mRNA in RMC, and a similar effect is observed with heparan sulfate chains isolated from RMC-cultures themselves. Although these cells internalize and degrade heparin, the timing of the maximal effect indicates an extracellular action of heparin. In keeping with this idea, 125I-heparin binds specifically to a single class of high affinity sites on the cell surface. The effect of heparin on c-fos induction may be independent of interaction with cytokines or cytokine receptors; its magnitude is not diminished when heparin-binding substances are removed from serum by heparin-Sepharose. Furthermore, direct activation of protein kinase C (PKC) with a phorbol ester in the absence of serum likewise induces c-fos and 1 microgram/ml heparin inhibits this response by 65%. Phorbol ester caused an increase in the proportion of histone H1-active PKC associated with the cell membrane fraction, from approximately 25% to 70% of total activity. Heparin affected neither the total activity of the kinase nor the proportion associated with the membrane. When PKC was inhibited with staurosporine, only very low levels of c-fos were induced by serum. We conclude that low concentrations of heparin and heparan sulfate suppress the mitogenic response of mesangial cells to serum and inhibit c-fos mRNA induction through an effect of cell surface-bound glycosaminoglycan on a signalling pathway downstream of PKC." @default.
• W2026054080 created "2016-06-24" @default.
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• W2026054080 date "1996-02-01" @default.
• W2026054080 modified "2023-10-16" @default.
• W2026054080 title "Inhibition of mitogenesis and c-fos induction in mesangial cells by heparin and heparan sulfates" @default.
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• W2026054080 doi "https://doi.org/10.1038/ki.1996.63" @default.
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