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  • Title: [Effect of oxytocin and naloxone on the plasma levels of corticosterone in the rat].
    Author: Montilla P, Muñoz JL, Ríos JE, Muñoz MC.
    Journal: Rev Esp Fisiol; 1989 Dec; 45(4):319-22. PubMed ID: 2631154.
    Abstract:
    The effect of two doses of oxytocin (2 or 4 UI/kg i.p.) has been studied in the male Wistar rats, either preceded or not by a naloxone administration (10 mg/kg i.p.), on the response of the hypothalamus-pituitary-adrenal system, the latter being valued by changes produced in the plasmatic corticosterone levels. Oxytocin produced significant increases of the plasmatic corticosterone levels, this effect being stronger and longer lasting after the superior dose. Naloxone alone produced the same effect, but not as intense and stable as that of oxytocin. Pretreatment with naloxone modified the response of the hypothalamus-pituitary-adrenal system to oxytocin, producing partial blockade. The results suggest that the oxytocin action on the hypothalamus-pituitary-adrenal axis might be mediated by the endogenous opiates.
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