期刊
CELLULAR IMMUNOLOGY
卷 274, 期 1-2, 页码 61-71出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.cellimm.2012.02.002
关键词
Alcohol; Phagosome; Small GTPase; Rac; Rho; VavGEF; Alveolar macrophage; RAW264.7
资金
- National Institutes of Health [R01 AA012034, F31 AA017027, F31 AA017032, T32 AA013527]
- Illinois Excellence in Academic Medicine Grant
- Ralph and Marian C. Falk Research Trust
Clinical and laboratory investigations have provided evidence that ethanol suppresses normal lung immunity. Our initial studies revealed that acute ethanol exposure results in transient suppression of phagocytosis of Pseudomonas aeruginosa by macrophages as early as 3 h after initial exposure. Focusing on mechanisms by which ethanol decreases macrophage Fc gamma-receptor (Fc gamma R) phagocytosis we targeted the study on the focal adhesion and cytoskeletal elements that are necessary for phagosome progression. Ethanol inhibited macrophage phagocytosis of IgG-coated bead recruitment of actin to the site of the phagosome, dampened the phosphorylation of vinculin, but had no effect on paxillin phosphorylation suggesting a loss in phagosomal adhesion maturation. Moreover, our observations revealed that Fc gamma R-phagocytosis induced Rac activation, which was increased by only 50% in ethanol exposed cells, compared to 175% in the absence of ethanol. This work is the first to show evidence of the cellular mechanisms involved in the ethanol-induced suppression of Fc gamma R-mediated phagocytosis. (C) 2012 Elsevier Inc. All rights reserved.
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