Interdependence of hypoxic and innate immune responses.
Hypoxia-inducible factor (HIF) is an important transcriptional regulator of cell metabolism and the adaptation to cellular stress caused by oxygen deficiency (hypoxia). Phagocytic cells have an essential role in innate immune defence against pathogens and this is a battle that takes place mainly in the hypoxic microenvironments of infected tissues. It has now become clear that HIF promotes the bactericidal activities of phagocytic cells and supports the innate immune functions of dendritic cells, mast cells and epithelial cells. In response to microbial pathogens, HIF expression is upregulated through pathways involving the key immune response regulator nuclear factor-kappaB, highlighting an interdependence of the innate immune and hypoxic responses to infection and tissue damage. In turn, HIF-driven innate immune responses have important consequences for both the pathogen and the host, such that the tissue microenvironment fundamentally influences susceptibility to infectious disease.
Nizet
Victor
V
Department of Pediatrics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA. vnizet@ucsd.edu
Johnson
Randall S
RS
D000818:Animals; D015687:Cell Hypoxia / Q000276:immunology; D006801:Humans; D051793:Hypoxia-Inducible Factor 1 / Q000276:immunology / Q000378:metabolism*; D007113:Immunity, Innate; D007239:Infections / Q000276:immunology / Q000378:metabolism; D007249:Inflammation / Q000276:immunology / Q000378:metabolism; D016023:Integrins / Q000276:immunology / Q000378:metabolism; D022423:Myeloid Cells / Q000276:immunology* / Q000378:metabolism; D016328:NF-kappa B / Q000276:immunology / Q000378:metabolism; D011393:Procollagen-Proline Dioxygenase / Q000276:immunology / Q000378:metabolism; D018805:Sepsis / Q000276:immunology / Q000378:metabolism
D051793:Hypoxia-Inducible Factor 1; D016023:Integrins; D016328:NF-kappa B; D011393:Procollagen-Proline Dioxygenase
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