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1 (TGF-1) in Human Airway Epithelial Cells
1 Section of Pulmonary and Critical Care Medicine, University of Chicago, Chicago, IL, USA
2 McDonald Research Laboratories, University of British Columbia, Vancouver, BC, Canada
* To whom correspondence should be addressed. E-mail: swhite{at}medicine.bsd.uchicago.edu.
Transforming growth factor-
1 (TGF-1) belongs to a family of multifunctional cytokines which regulate a variety of biological processes including cell differentiation, proliferation, and apoptosis. The effects of TGF-1 are cell context and cell cycle specific and may be signaled through several pathways. We examined the effect of TGF-1 on apoptosis of primary human
central airway epithelial cells and cell lines. TGF-1 protected human airway epithelial cells from apoptosis induced by either activation of the Fas death receptor (CD95) or by corticosteroids. This protective effect was blocked by inhibition of the Smad pathway via over-expression of inhibitory Smad7. The protective effect is associated with an increase in the cyclin dependent
kinase inhibitor p21 and was blocked by the over expression of key gatekeeper cyclins for the G1/S interface, cyclins D1 and E. Blockade of the Smad pathway by overexpression of the inhibitory Smad7 permitted demonstration of a TGF--mediated pro-apoptotic pathway. This proapoptotic
effect was blocked by inhibition of the p38 MAPK kinase signaling using the inhibitor SB203580 and was associated with an increase in p38 activity as measured by a kinase assay. Here we demonstrate dual signaling pathways involving TGF-1, an anti-apoptotic pathway mediated
by the Smad pathway involving p21, and an apoptosis-permissive pathway mediated in part by p38 MAPK.
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