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. 1989 Aug;9(8):3411–3417. doi: 10.1128/mcb.9.8.3411

c-ras-Ha gene expression is regulated by insulin or insulinlike growth factor and by epidermal growth factor in murine fibroblasts.

K H Lu 1, R A Levine 1, J Campisi 1
PMCID: PMC362387  PMID: 2677672

Abstract

Although much is known about the structure of ras-encoded proteins, little is known about how expression is regulated. In serum-stimulated murine fibroblasts, c-ras-Ha mRNA levels fluctuated with the growth state but not with the position in the cell cycle. Two types of growth factors regulated c-ras-Ha expression: insulin (IN) or insulinlike growth factor I, each apparently acting through its cognate receptor, and epidermal growth factor (EGF). In quiescent cells, IN or insulinlike growth factor I induced c-ras-Ha mRNA three- to fivefold within 4 h, but thereafter the mRNA declined. By contrast, EGF had little effect in 4 h but induced the mRNA after 4 to 6 h. When quiescent cells were given serum or IN and EGF simultaneously, c-ras-Ha mRNA rose steadily, beginning 1 to 2 h after stimulation, and reached a stable five- to sevenfold elevation in 16 h. Thus, c-ras-Ha gene expression was sequentially regulated by two growth factors, one of which (IN) does not induce expression of other growth-regulated protooncogenes. A transformed derivative cell line that does not require IN for G1 progression has lost early IN-dependent but not late serum-dependent regulation. The results support the possibility that c-ras-Ha and IN action are functionally linked.

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