Abstract
We have investigated the effect of interleukin-1 (IL-1) on the growth of vascular smooth muscle cells (VSMC) isolated from rat aortae. Murine recombinant IL-la increased tritiated leucine incorporation into VSMC. IL-1 also stimulated tritiated thymidine uptake by VSMC in a dose-dependent manner. On the other hand, Ca 2+-channel blocker, verapamil, inhibited the IL-1-induced thymidine uptake by VSMC with an IC 50 of 10 −8 M. Antibody specific for platelet-derived growth factor (PDGF) also totally inhibited the IL-1-induced thymidine uptake. IL-1 showed no effects on the intracellular CaZ+ level in VSMC. Above results support the premise that IL-1 promotes the growth of VSMC via induction of endogenous PDGF production and might thus participate in the abnormal proliferation of VSMC that occurs early in atherogenesis.
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