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. 1995 May;115(2):356–360. doi: 10.1111/j.1476-5381.1995.tb15885.x

Kallikrein rK10-induced kinin-independent, direct activation of NO-formation and relaxation of rat isolated aortic rings.

I Wassdal 1, R Hull 1, V P Gerskowitch 1, T Berg 1
PMCID: PMC1908329  PMID: 7545521

Abstract

1. rK10, a weak T-kininogenase isolated from the rat submandibular gland, is a protein belonging to the rat kallikrein family. In the present work, we have studied the biological effects of rK10 with respect to its ability to alter vascular resistance, either directly like rK9, i.e. another kallikrein-like protein, trypsin and thrombin, or through the release of kinins like tissue kallikrein (rK1). The direct effect was studied by its vasomotor activity on rat isolated aortic rings since this preparation was insensitive to the action of kinins. Its ability to induce altered vascular resistance through kinin-generation was investigated by blood pressure studies in whole animals. The studies were performed in comparison to rK1. 2. Unlike rK1, which induces hypotension when administered intravenously to rats (delta BP = -56 +/- 5 mmHg, 5 micrograms kg-1), rK10 did not have any effect on systemic blood pressure (delta BP = -3 +/- 1, 5 micrograms kg-1, i.v.). 3. rK10 was without effect on uncontracted aortic rings, but showed a concentration-dependent (10(-8)-10(-6) M) relaxant effect on tissue precontracted with phenylephrine (10(-6) M). After removal of endothelial cells, no relaxation was observed. The relaxant response to rK10 was transient. rK1 (with and without endothelium), bradykinin and T-kinin (with endothelium) had no effect on contracted or uncontracted aortic rings. 4. The relaxant effect of rK10 was dependent on its enzymatic activity since preincubation with aprotinin (1.02 mM) significantly reduced vasorelaxation from 74 +/- 4% to 24 +/- 3%.(ABSTRACT TRUNCATED AT 250 WORDS)

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