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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Effects of cigarette smoke exposure and cessation on inflammatory cells and matrix metalloproteinase activity in mice.
Experimental Lung Research 2004 January
B6C3F1 female mice were exposed to cigarette smoke (CS) (250 mg/m3 total particulate material) or filtered air (FA), 6 hours/day, 5 days/week, for 6, 7, or 10 weeks, or to CS for 6 weeks, then FA for 1 or 4 additional weeks. Exposure to CS increased macrophages, neutrophils, lymphocytes, and matrix metalloproteinase (MMP)-2 and MMP-9 content in bronchoalveolar lavage fluid. Partial recovery of most lavage parameters (except lymphocytes) was observed 1 week after cessation of CS exposure with further reductions after 4 weeks, but interstitial inflammation persisted longer. These results support a role for MMPs in CS-induced emphysema and indicate that smoking cessation allows restoration toward normal homeostasis.
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