In fibrobiasts in culture, the levels of cyclin D1 mRNA are growth regulated. In mouse and in human fibroblasts, both serum and platelet-derived growth factor increase cyclin D1 mRNA levels with similar kinetics of induction. Insulin-like growth factor 1 by itself does not induce cyclin D1 expression, and an antisense oligodeoxynucleotide to the insulin-like growth factor 1 receptor RNA does not affect the growth-regulated levels of cyclin D1 mRNA.


This work was supported by Grants GM 33694 and CA53484 from the NIH.

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