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. 1988 Mar 1;106(3):797–803. doi: 10.1083/jcb.106.3.797

Epidermal growth factor controls smooth muscle alpha-isoactin expression in BC3H1 cells

PMCID: PMC2115111  PMID: 3279054

Abstract

We have examined the effects of epidermal growth factor (EGF), platelet- derived growth factor, and insulin on the differentiation of a mouse vascular smooth muscle-like cell line, the BC3H1 cells. On the basis of cell morphology and smooth muscle alpha-isoactin synthesis, we demonstrate that EGF at physiological concentrations prevents the differentiation of these cells, whereas platelet-derived growth factor has no apparent effect. The induction of alpha-isoactin synthesis by serum deprivation is inhibited by EGF in a dose-dependent manner with a half-maximal effect at 3-5 ng/ml and a maximal inhibition at approximately 30 ng/ml. Northern analysis also shows that EGF blocks the accumulation of alpha-isoactin mRNA normally observed during cell differentiation. Addition of EGF to differentiated cells results in a repression of alpha-isoactin synthesis, a stimulation of beta- and gamma-isoactin synthesis, and the stabilization of the nonmuscle isoactins. The synthesis of creatine phosphokinase, a muscle-specific noncontractile protein, is also regulated by EGF in a similar fashion. Modulation by EGF of alpha-isoactin expression is not affected by aphidicolin and is therefore independent of its mitogenic effect on these cells. Insulin is not required for observation of the EGF- dependent effects but instead seems to promote differentiation. Our results show that EGF can replace serum in controlling the differentiation of BC3H1 cells.

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Selected References

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