Robert Beauchamp
Principal Investigator
Last active: 10/31/2018

Transforming growth factor-beta inhibits rat intestinal cell growth by regulating cell cycle specific gene expression.

Ko TC, Beauchamp RD, Townsend CM, Thompson EA, Thompson JC
Am J Surg. 1994 167 (1): 14-9; discussion 19-20

PMID: 8311125 · DOI:10.1016/0002-9610(94)90048-5

Transforming growth factor-beta 1 (TGF-beta 1) inhibits the growth of intestinal cells, but the mechanisms involved are unknown. Using a rat intestinal crypt cell line (IEC-6), we determined the site of action in the cell cycle that TGF-beta 1 acts to suppress proliferation. We also examined the effect of TGF-beta 1 on the expression of proliferation-associated "immediate early" genes (zif268, jun-B, c-myc) during the early G1 phase and the cdc2 gene during the transition from the G1 phase to the S phase of the cell cycle. Cell cycle progression was determined by incorporation of 3H-thymidine, and gene expression was analyzed by Northern blot analysis. We found that TGF-beta 1 acts to inhibit proliferation of rat intestinal crypt cells by blocking cell cycle progression at the middle G1 phase. The genes activated during G1 can be divided into TGF-beta 1 insensitive (zif268, jun-B, and c-myc) and TGF-beta 1 sensitive (the cdc2 gene). TGF-beta 1 suppresses the induction of the cdc2 gene during the G1/S transition without inhibiting the activation of immediate early genes during the early G1 phase.

MeSH Terms (10)

Animals Blotting, Northern Cell Cycle Cell Line Gene Expression Regulation Genes, Immediate-Early Interphase Intestinal Mucosa Rats Transforming Growth Factor beta

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