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Pulmonary alveolar macrophages were obtained from healthy volunteers by saline pulmonary lavage, and aryl hydrocarbon hydroxylase was measured in the cells. Enzyme activity was low in cells from five nonsmokers with a mean of 0.008+/-0.004 U/10(6) cells. Cells obtained from nine cigarette smokers contained higher enzyme levels, with a mean of 0.095+/-0.024 U/10(6) cells. A former cigarette smoker was lavaged on five occasions. Enzyme activity during two lavages 4 mo apart were 0.010 and 0.009 U/10(6) cells, respectively. 1 wk after smoking was resumed, the enzyme activity rose slightly to 0.013, and reached 0.041 U/10(6) cells by 1 mo. Upon cessation of smoking, the enzyme activity returned to control levels by the next lavage, 2 mo later. These data indicate that aryl hydrocarbon hydroxylase may be induced in pulmonary alveolar macrophages of subjects chronically exposed to cigarette smoke.
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R R Martin
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E T Cantrell, and
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E T Cantrell, and
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E T Cantrell, and
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E T Cantrell, and
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E T Cantrell, and
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