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Am. J. Respir. Cell Mol. Biol., Volume 18, Number 2, February, 1998 179-187

Induction of p21WAF/CIP1 during Hyperoxia

Sharon A. McGrath

Department of Pediatrics, Eudowood Division of Pediatric Respiratory Sciences, Johns Hopkins Medical Institutions, Baltimore, Maryland

p21WAF/CIP1 is an important regulator of cell cycle progression (). When induced, p21WAF/CIP1 protein inhibits cell cycle progression at the G1/S interface, resulting in growth arrest of the cell. To determine if p21WAF/CIP1 is involved in growth arrest and lung injury during hyperoxia, several cell lines were exposed to high levels of hyperoxia. p21WAF/CIP1 was found to be induced by 72 h in all three cell lines. Next, using an in vivo model, p21WAF/CIP1 was found to be induced at both the mRNA and protein level in neonatal murine lung born and maintained in hyperoxia. Localization of p21WAF/CIP1 was found in the peripheral airway cells. Hyperoxia-induced p21WAF/CIP1 expression was then shown to be mediated through the p53 pathway, using adult p53 mutant mice. These studies demonstrated that p21WAF/CIP1 is induced both in cells grown in culture and in neonatal and adult lung exposed to high levels of hyperoxia. Localization of p21WAF/CIP1 expression to the peripheral airway cells suggests that p21WAF/CIP1 may act to inhibit growth of alveoli in neonatal lung and delay repopulation of alveolar cells during hyperoxic administration.




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