DILATATION OF CEREBRAL MICROVESSELS MEDIATED BY ENDOTHELIN ET(B) RECEPTOR AND NITRIC-OXIDE IN CATS

The functional role of the endothelin (ET)(B) receptor in the cerebral microvessels was examined in seven anesthetized cats. The effects of intracarotidly injected IRL1620, st selective ET(B) receptor agonist, on the cerebral blood volume (CBV) in the cortex were examined by a photoelectric method. CBV reflects the cumulative dimensions of the cerebral microvessels. High doses of IRL1620 (0.1-1 nmol/kg) elicited a transient fan in CBV, followed by a marked and dose-related increase of CBV (P < 0.01). The CBV increase was significantly inhibited (P < 0.01) by simultaneous administration of 0.35 mg/kg/min N-G-monomethyl-L-arginine (L-NMMA), an inhibitor of nitric oxide synthesis. The marked, but transient, depressor effect of IRL1620 was also attenuated (P < 0.01) by L-NMMA. The ET(B) receptor subtype and production of nitric oxide, probably in the endothelium, mediate the vasodilatory action of ET in the cerebral microvessels.