Evidence for a role of the plasma kallikrein-kinin system in acute inflammation: reduced exudation during carrageenin- and kaolin-pleurisies in kininogen-deficient rats.

Experimental pleurisy was induced by intrapleural injection of carrageenin or kaolin in three strains of rat: Brown Norway-Katholiek (B/N-Ka), Brown Norway-Kitasato (B/N-Ki) and Sprague-Dawley (SD). B/N-Ka rats (kininogen-deficient) showed significantly less pleural fluid accumulation and exudation rate than SD rats or than B/N-Ki rats (normal). The result indicates the involvement of the plasma kallikrein-kinin system in these pleurisies and a role of high-molecular-weight kininogen is suggested.