Kol A. Zarember, Harry L. Malech
J Clin Invest.
2005;
115(7):1702–1704
doi:10.1172/JCI25740
This article Copyright © 2005, The American Society for Clinical Investigation
Abstract
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n the days following infection, when the human body develops and refines antibodies and prepares to mount an adaptive immune response, the bulwark of innate host defense against microbial infection is the polymorphonuclear leukocyte (PMN). PMNs seek out, identify, engulf, and sterilize invading microbes using both O2-dependent and O2-independent antimicrobial systems. A decrease in PMN numbers or function caused by immunosuppression or disease increases the risk of infection. In this issue of the JCI, Peyssonnaux et al. identify a novel and essential role for hypoxia-inducible factor–1α in regulating several important PMN functions relevant to host defense, including transcription of cationic antimicrobial polypeptides and induction of NO synthase.
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