Hypoxia regulates macrophage functions in inflammation.
The presence of areas of hypoxia is a prominent feature of various inflamed, diseased tissues, including malignant tumors, atherosclerotic plaques, myocardial infarcts, the synovia of joints with rheumatoid arthritis, healing wounds, and sites of bacterial infection. These areas form when the blood supply is occluded and/or unable to keep pace with the growth and/or infiltration of inflammatory cells in a given area. Macrophages are present in all tissues of the body where they normally assist in guarding against invading pathogens and regulate normal cell turnover and tissue remodeling. However, they are also known to accumulate in large numbers in such ischemic/hypoxic sites. Recent studies show that macrophages then respond rapidly to the hypoxia present by altering their expression of a wide array of genes. In the present study, we outline and compare the phenotypic responses of macrophages to hypoxia in different diseased states and the implications of these for their progression and treatment.
Murdoch
Craig
C
Tumor Targeting Group, Academic Unit of Pathology, Division of Genomic Medicine, The Henry Wellcome Laboratories for Medical Research, University of Sheffield Medical School, Sheffield S10 2RX.
Muthana
Munitta
M
Lewis
Claire E
CE
D000818:Animals; D001172:Arthritis, Rheumatoid / Q000235:genetics / Q000276:immunology; D050197:Atherosclerosis / Q000235:genetics / Q000276:immunology; D001424:Bacterial Infections / Q000235:genetics / Q000276:immunology; D015687:Cell Hypoxia / Q000235:genetics / Q000276:immunology; D015870:Gene Expression; D006801:Humans; D000860:Hypoxia / Q000150:complications / Q000235:genetics / Q000276:immunology*; D066298:In Vitro Techniques; D007249:Inflammation / Q000150:complications / Q000235:genetics / Q000276:immunology*; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D018448:Models, Immunological; D009369:Neoplasms / Q000235:genetics / Q000276:immunology; D014947:Wounds and Injuries / Q000235:genetics / Q000276:immunology