Cell. 1990 Nov 2;63(3):515-24.

TGF-beta induces bimodal proliferation of connective tissue cells via complex control of an autocrine PDGF loop.

Battegay EJ, Raines EW, Seifert RA, Bowen-Pope DF, Ross R.

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Department of Pathology, University of Washington, Seattle 98195.

Abstract

Transforming growth factor-beta (TGF-beta) acts as a growth inhibitor, yet it can stimulate proliferation; 1-2 fg/cell of TGF-beta 1 elicits maximal proliferation of dense and sparse cultured smooth muscle cells (SMCs), whereas higher amounts are less stimulatory. This bimodal response is not limited to SMCs, as TGF-beta induces a similar response in human fibroblasts and chondrocytes. The amount of TGF-beta 1 per cell that induces maximal proliferation is identical for dense and sparse SMCs. At low concentrations of TGF-beta, there is a 10-12 hr delay in DNA synthesis compared with that elicited by PDGF. PDGF-AA is detected in the culture medium at 24 hr, and anti-PDGF IgG blocks DNA synthesis. At higher concentrations, TGF-beta 1 decreases transcripts and expression of PDGF receptor alpha subunits. Hence, TGF-beta induces proliferation of connective tissue cells at low concentrations by stimulating autocrine PDGF-AA secretion, which at higher concentrations of TGF-beta, is decreased by down-regulation of PDGF receptor alpha subunits and perhaps by direct growth inhibition.

PMID:: 2171777; [PubMed - indexed for MEDLINE]

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