Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P01178 (oxytocin)
 15,767 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The modulation of alpha(2)-adrenoceptor-induced food intake by oxytocin has been evaluated in studies on food intake and by quantitative receptor autoradiography in the hypothalamus and the amygdala of the rat. The effects of lateral intracerebroventricular administration of clonidine and oxytocin were evaluated on food intake in satiated animals. Food consumption was measured at 30, 90, 240 min and 22 h (1,320 min) after injection. The coinjection of oxytocin and clonidine was found to counteract the increase in food intake produced by clonidine (p < 0.001) in satiated rats. Receptor autoradiographic experiments showed that oxytocin significantly increased the K(d) values of [(3)H]p-aminoclonidine alpha(2)-agonist-binding sites in the hypothalamus. Effective oxytocin concentrations ranged between 0.3 and 1 nM (p < 0.05) with a maximal action of 250% at 1 nM. The B(max) value was significantly increased (p < 0.05) for all concentrations of oxytocin. In the amygdala, oxytocin also increased both the K(d) of [(3)H]p-aminoclonidine-binding sites by about 190% at 1 nM and the B(max) values at 1 and 3 nM (p < 0.05). Oxytocin (1 nM) also significantly and substantially (p < 0.01) increased the K(d) and B(max) values of the [(3)H]UK 14.304 alpha(2)-agonist-binding sites in the hypothalamus and amygdala in agreement with the results obtained with the other agonist of the alpha(2)-adrenoceptor [(3)H]p-aminoclonidine. This effect was partially blocked by the presence of the specific oxytocin receptor antagonist, CAP. These findings suggest the existence of an antagonistic oxytocin/alpha(2)-receptor interaction in the hypothalamus and amygdala that may be of relevance for the demonstrated modulation of alpha(2)-adrenoceptor-induced feeding responses by oxytocin.
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PMID:Oxytocin/alpha(2)-Adrenoceptor interactions in feeding responses. 1072 92

Oxytocin (OT) and arginine-vasopressin (AVP) are two major neurohypophysary nonapeptides that have impor-tant roles during pregnancy and labor. Using the expiant model at term, we have examined the effect of physiologic concentrations of both nonapeptides on placental hormone secretion. We found that OT had a dose-dependent inhibitory effect on P (2-3-fold.P<0.05) and hCG (2-fold,P<0.05) while increasing E(2) secretion (150-180%,P<0.05) into the media. The effect of OT on P secretion was receptor-dependent since it was abolished by addition of CAP-450 into the media. AVP increased E(2) secretion up to 2-fold. <0.05) while not having a consistent effect on P secretion. In conclusion, OT and to a lesser degree AVP, have significant modulatory effects on placental hormone secretion. Whether the resulting locally increased E(2)/P secretion ratio favors progression of labor remains to be shown.
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PMID:Modulatory effects of neurohypophysary origin hormones on placental hormone secretion at term. 2115 70


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