The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 146, 457-467, Copyright © 1977 by Rockefeller University Press

ARTICLES

Activation of factor XII by tobacco glycoprotein

CG Becker and T Dubin

A glycoprotein of mol wt ca. 18,000 daltons isolated from cured tobacco leaves (TGP-L) and from cigarette smoke condensate (TGP-CSC) activated factor XII in normal human plasma in vitro as measured by (a) shortening of the partial thromboplastin time, (b) shortening of the lysis time of euglobulin clots, and (c) generation of kinin activity. These effects were not demonstrable in plasma deficient in factor XII. The capacity of TGP-L and TGP-CSC to activate factor XII was shown to depend on the presence of rutin, a substance chemically similar to quercetin and ellagic acid, which are known activators of factor XII. Rutin and rutin coupled to bovine serum albumin, but not bovine serum albumin alone, were also demonstrated to activate factor XII. The presence in cigarette smoke of material that is both allergenic and capable of activating factor XII of the intrinsic pathway of coagulatin may be important to the pathogenesis of cardiovascular and pulmonary disease associated with cigarette smoking.
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