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Acute turpentine inflammation and kinin release in rat-paw thermic oedema.

Livers from rats at 2-3 days after s.c. injection of turpentine, when perfused, synthesized prekallikrein nearly 3 times faster than did livers from normal rats. On the other hand paw oedema, produced by heating to 46 degrees, in rats injured in this way was less marked. Likewise in such rats the amount of bradykinin release by 50 min. of coaxial perfusion of the paw was only 13.6 +/- 4.6 compared with 63.1 +/- 13.4 ng in normal rats. A possible explanation for the observed reduction in production of bradykinin may be inhibition of kallikrein due to an increased concentration of alpha 2-macroglobulin.