Browsing by Author "Rothhaar, Katia"

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    Hypoxia-Inducible Factor-1α Regulates CD55 in Airway Epithelium
    (American Thoracic Society, 2016-12) Pandya, Pankita H.; Fisher, Amanda J.; Mickler, Elizabeth A.; Temm, Constance J.; Lipking, Kelsey P.; Gracon, Adam; Rothhaar, Katia; Sandusky, George E.; Murray, Mary; Pollok, Karen; Renbarger, Jamie; Blum, Janice S.; Lahm, Tim; Wilkes, David S.; Microbiology and Immunology, School of Medicine
    Airway epithelial CD55 down-regulation occurs in several hypoxia-associated pulmonary diseases, but the mechanism is unknown. Using in vivo and in vitro assays of pharmacologic inhibition and gene silencing, the current study investigated the role of hypoxia-inducible factor (HIF)-1α in regulating airway epithelial CD55 expression. Hypoxia down-regulated CD55 expression on small-airway epithelial cells in vitro, and in murine lungs in vivo; the latter was associated with local complement activation. Treatment with pharmacologic inhibition or silencing of HIF-1α during hypoxia-recovered CD55 expression in small-airway epithelial cells. HIF-1α overexpression or blockade, in vitro or in vivo, down-regulated CD55 expression. Collectively, these data show a key role for HIF-1α in regulating the expression of CD55 on airway epithelium.