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The Journal of Immunology, Vol 159, Issue 8 3949-3960, Copyright © 1997 by American Association of Immunologists
ARTICLES |
A Mooney, T Jobson, R Bacon, M Kitamura and J Savill
Department of Medicine, University Hospital, Nottingham, United Kingdom. Andrew.Mooney@Nottingham.ac.uk
Resolution of glomerular inflammation requires the removal of proliferating resident glomerular mesangial cells, but excessive loss of glomerular cells is a feature of postinflammatory scarring. Because apoptosis regulates mesangial cell number in glomerular inflammation, we have studied the exogenous control of apoptosis triggered in cultured mesangial cells by stimuli likely to be important in vivo. Apoptosis could be induced by serum deprivation to model decreased availability of survival factors, by etoposide as an example of DNA- damaging agents, by ligation of mesangial cell Fas, and by protein synthesis inhibition by cycloheximide. Insulin-like growth factor I (IGF-I), IGF-II, and basic fibroblast growth factor were each able to suppress apoptosis induced by serum deprivation, whereas TGF-beta 1, epidermal growth factor, and platelet-derived growth factor had no effect. IGF-I and IGF-II (but not basic fibroblast growth factor) were also able to protect cells from apoptosis induced by etoposide or cycloheximide. However, Fas-mediated apoptosis was resistant to suppression by all three cytokines. None of the cytokines tested caused a change in the levels of expression of Bcl-2, Bax, Bcl-x, or Bak proteins. The survival-promoting properties of serum-free medium conditioned by mesangial cells was abrogated by neutralizing IGF-I Ab. These experiments are the first to define cytokines that inhibit apoptosis and thereby promote survival of mesangial cells, and the data indicate a paracrine survival signaling role for IGF-I. Finally, the data show that Fas ligation can override cytokine survival signaling, emphasizing a candidate role for this molecule in the undesirable apoptotic loss of mesangial cells during the progression of glomerular scarring.
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