Effects of antiproteases (aprotinin and gabexate-mesilate) on the postischemic vascular response of the kidney.

Abstract:

:Both under physiologic conditions and after short-term ischemia (1-3 min) kallikrein and locally synthesized prostaglandins contribute to control renal blood flow. In the present experiment the antiproteases aprotinin and gabexate-mesilate were administered to rabbits in an attempt to show whether the hemodynamic changes produced by 60 min of normothermic ischemia, i.e., postischemic hyperemia and reduction of vascular resistance, were equally mediated by kallikrein. Vascular responses were evaluated by determining renal cortical blood flow using radioactively labelled microspheres, by calculating vascular resistances, and by measuring the diameters of renal medullary vessles. Kidneys exposed to normothermic ischemia and sham-operated control organs of animals treated with aprotinin (2 X 40,000 KIU/kg body weight) and gabexate-mesilate (2 X 7 mg/kg body weight) were compared with those of rabbits which were analogously operated, but did not receive any drugs. As the antiproteases used did not significantly affect the hyperemia and the reduction of renal cortical vascular resistance seen after 60 min of normothermic ischemia, these phenomena are apparently not mediated by kallikrein. Renal medullary vasodilatation (arteriolae rectae) was significantly lower under aprotinin than in untreated ischemic kidneys, and was not longer demonstrable in gabexate-mesilate-treated animals. Thus, the effect of gabexate-mesilate was superior to that of aprotinin. Whether the antiprotease action is due to an unspecific membrane-stabilizing, to a general enzyme-inhibiting, or to a specific kallikrein-inhibiting effect, is still unclear.

journal_name

Urol Int

journal_title

Urologia internationalis

authors

Pflüger H,Maier M,Binder BR

doi

10.1159/000280880

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

150-7

issue

3

eissn

0042-1138

issn

1423-0399

journal_volume

38

pub_type

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