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. 1984 Feb 1;98(2):534–540. doi: 10.1083/jcb.98.2.534

Glucocorticoid inhibition of vascular smooth muscle cell proliferation: influence of homologous extracellular matrix and serum mitogens

PMCID: PMC2113119  PMID: 6693494

Abstract

We examined the influence of glucocorticoid hormones on the proliferation of cultured adult bovine aortic smooth muscle cells (BASM) using both primary mass cultures and a cloned strain. Cloned BASM cells maintained on plastic culture dishes were inhibited by approximately 40% by dexamethasone treatment but showed no inhibition when grown of homologous extracellular matrix (ECM) coated dishes. Dexamethasone inhibited growth of primary cultures by 73% on plastic and by 45% on ECM. The inhibitory effect was specific for the glucocorticoids, dexamethasone, corticosterone, and cortisol and was not observed with progesterone, aldosterone, estradiol or 17-alpha OH progesterone. In cloned cells, the abolition of glucocorticoid inhibition by ECM was independent of seeding density and serum concentration. The inhibition on plastic was dependent on serum concentrations greater than 1% and resulted in both a slow rate of proliferation and a lower saturation density. A specific subset of peptides detected on two-dimensional gels was induced by glucocorticoids under growth inhibitory conditions but was not induced when the cells were grown on ECM. Primary cultures grown on ECM and exposed to Dulbecco's modified Eagle's Medium (DME) containing high density lipoprotein and transferrin grew at 40% of the rate observed for cultures exposed to DME with 10% serum. Both conditions showed growth inhibition of 70% in the presence of dexamethasone. The addition of epidermal and platelet-derived growth factors in DME containing high density lipoprotein and transferrin to cells grown on ECM resulted in growth rates comparable to that observed with cultures exposed to 10% serum and were inhibited 45% by dexamethasone. These results suggest that glucocorticoids inhibit smooth muscle proliferation by decreasing the sensitivity of the cells to mitogenic stimulation by high density lipoprotein when the cells are maintained on a homologous substrate.

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Selected References

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