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- W1845494818 abstract "Interleukin-1 (IL-1) is a proinflammatory monocyte- and macrophage-derived cytokine that has potent vasorelaxant effects on vascular smooth muscle cells (VSMC). VSMC themselves also express both IL-1 alpha- and beta-genes, suggesting that IL-1 may be an autocrine regulator of VSMC function. The present study demonstrates that human saphenous vein VSMC (HSVSMC) produce IL-1 receptor antagonist (IL-1Ra), a specific inhibitor of IL-1 action. IL-1Ra was produced constitutively in most experiments, and its production was upregulated by phorbol 12-myristate 13-acetate and by IL-1 beta. IL-1Ra produced by HSVSMC remained predominately cell associated and was not detectable extracellularly. Furthermore, reverse transcription-polymerase chain reaction analysis and cDNA sequencing indicated that HSVSMC express the alternatively spliced form of IL-1Ra which lacks the signal peptide present in secreted IL-1Ra. HSVSMC also produced IL-1 alpha and the precursor form but not the mature form of IL-1 beta. These results suggest that HSVSMC lack active IL-1 beta-converting enzyme. Like IL-1Ra, IL-1 beta precursor and IL-1 alpha remained cell associated, predominately in the cytosolic fraction. IL-1 beta induced production of both IL-1Ra and IL-1 alpha at each time point and concentration tested. In contrast, platelet-derived growth factor and transforming growth factor-beta augmented production of IL-1Ra, but not that of IL-1 alpha. These results are suggestive of an autocrine role for cell-associated IL-1Ra, as well as for IL-1 alpha and IL-1 beta, in the regulation of VSMC function." @default.
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- W1845494818 date "1995-10-01" @default.
- W1845494818 modified "2023-10-14" @default.
- W1845494818 title "Human vascular smooth muscle cells produce an intracellular form of interleukin-1 receptor antagonist" @default.
- W1845494818 doi "https://doi.org/10.1152/ajpcell.1995.269.4.c961" @default.
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