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Am J Physiol Lung Cell Mol Physiol 282: L863-L871, 2002. First published December 7, 2001; doi:10.1152/ajplung.00368.2001
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Vol. 282, Issue 4, L863-L871, April 2002

Protective role of retinoic acid from antiproliferative action of TNF-alpha on lung epithelial cells

Valérie Besnard, Elodie Nabeyrat, Alexandra Henrion-Caude, Katarina Chadelat, Laurence Perin, Yves Le Bouc, and Annick Clement

Département de Pneumologie Pédiatrique, Institut National de la Santé et de la Recherche Médicale U515, Hôpital Trousseau Assistance Publique-Hôpitaux de Paris, Université Paris VI, 75012 Paris, France

Tumor necrosis factor (TNF)-alpha is a key molecule in lung inflammation. We have established the insulin-like growth factor binding protein 2 (IGFBP-2) as a marker associated with the growth arrest of lung alveolar epithelial cells (AEC). Here, we studied the effects of TNF-alpha on AEC proliferation and the putative protective role of retinoic acid (RA). We documented an antiproliferative action of TNF-alpha that was reversible only at 24 h and then became irreversible with induction of apoptosis. TNF-alpha treatment was associated with a dramatic induction of IGFBP-2. To discover the mechanism of action of IGFBP-2, we further tested the mitogenic potential of IGF-I to counteract TNF-alpha inhibition. Addition of IGF-I to the TNF-alpha containing medium did not stimulate proliferation, whereas des(1-3)IGF-I, an analog of IGF-I that bears low affinity for IGFBPs, was able to restore cell growth. Interestingly, we observed that RA abrogated TNF-alpha -induced growth arrest and that this effect was associated with a dramatic decrease in IGFBP-2 expression. These results suggest a protective role of RA from TNF-alpha antiproliferative action, through mechanisms involving modulation of IGFBP-2 production.

lung epithelial cells; inflammation; insulin-like growth factor; proliferation; retinoic acid


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