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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1991 Mar 1;88(5):1726–1730. doi: 10.1073/pnas.88.5.1726

Cleavage of the membrane precursor for transforming growth factor alpha is a regulated process.

A Pandiella 1, J Massagué 1
PMCID: PMC51097  PMID: 2000380

Abstract

Transforming growth factor alpha (TGF-alpha) is generated by cleavage of a membrane-anchored precursor protein, proTGF-alpha. ProTGF-alpha is cleaved at a slow rate and accumulates on the cell surface, thereby mediating cell-cell adhesion and mitogenic stimulation. We show here that cleavage of membrane proTGF-alpha by an elastase-like enzyme constitutes an important regulatory step in the generation of soluble TGF-alpha. Cleavage is activated in response to serum factors and tumor-promoting phorbol esters, leading to depletion of cell surface proTGF-alpha, which disperses as soluble factor. Activation of proTGF-alpha cleavage is mediated by protein kinase C-dependent and -independent mechanisms. The results demonstrate the existence of mechanisms that control the switch of TGF-alpha from a juxtacrine to a paracrine growth factor.

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Selected References

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