Abstract:
:1. Electrolytic lesions were made in various brain regions of the rat, and the effects of these lesions on nociceptive threshold and the antinociceptive actions of morphine were tested using a shock titration technique. 2. Lesions in the medial thalamus, the periaqueductal grey area, or the caudate nucleus, had no effect on the nociceptive threshold; whereas, lesions in the posterior hypothalamus resulted in a small but statistically significant increase in this threshold. 3. Morphine administered intraperitoneally to rats having histologically verified lesions in the posterior hypothalamus, the caudate nucleus or the periaqueductal grey area resulted in a 15-30% increase in the nociceptive threshold. This increase was similar to that observed in unoperated control rats. On the other hand, injections of morphine into animals having greater than 50% of the medial thalamus destroyed produced a highly significant increase of 95% in the threshold. This potentiation of the antinociceptive action of morphine was not observed in rats having less than 50% destruction of the medial thalamus.
journal_name
Clin Exp Pharmacol Physioljournal_title
Clinical and experimental pharmacology & physiologyauthors
Yeung JC,Yaksh TL,Rudy TAdoi
10.1111/j.1440-1681.1975.tb03031.xkeywords:
subject
Has Abstractpub_date
1975-05-01 00:00:00pages
261-8issue
3eissn
0305-1870issn
1440-1681journal_volume
2pub_type
杂志文章abstract::1. Nitric oxide (NO), or peroxynitrite, is known to inhibit haemoproteins, including cytochrome P450 mono-oxygenases. The present study explores the functional correlates of the inhibition by NO of renal epoxygenase on the vascular responses to arachidonic acid (AA) in the perfused kidney. 2. Control kidneys produce m...
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