Abstract
Perivascular innervation of the mesenteric arteries of 7-week-old and 6-month-old spontaneously hypertensive rats and normotensive Wistar-Kyoto rats was examined. The densities of neuropeptide Y-containing nerve fibers and adrenergic nerve fibers were increased in the distal regions of mesenteric arteries of spontaneously hypertensive rats as compared with findings in Wistar-Kyoto rats. However, the densities of cholinergic nerve fibers, vasoactive intestinal polypeptide-containing, and substance P-containing nerve fibers in the mesenteric arteries of the spontaneously hypertensive rats were unchanged in comparison with findings in the Wistar-Kyoto rats. Thus, not only adrenergic nerve fibers but also neuropeptide Y-containing nerve fibers may play an important role in the development and maintenance of hypertension in spontaneously hypertensive rats.
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