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- W2104838175 abstract "A growing body of evidence suggests that vasopressinergic activity in the hypothalamus is important in stress-related behaviors (like drug abuse) in line with a role in the regulation of the hypothalamo-pituitary–adrenal axis (HPA). We hypothesized that in the naturally vasopressin-deficient Brattleboro rat, acute and chronic morphine treatment may lead to reduced HPA axis activity. Rats were treated either with a single dose of morphine (10 mg/kg subcutaneously) and serial blood samples were taken or were treated twice daily with increasing doses of morphine (10–100 mg/kg subcutaneously) for 16 days and animals were killed by decapitation 4 or 16 h after the last injection. Single morphine injection induced a biphasic ACTH and corticosterone elevation with smaller increases in vasopressin-deficient rats. Chronic morphine treatment induced the typical somatic and HPA axis changes of chronic stress; the absence of vasopressin did not prevent these changes. In rats repeatedly treated with morphine plasma, ACTH and corticosterone levels were elevated both 4 and 16 h after the last injection (short and long withdrawal) and the absence of vasopressin attenuated this response. Our data suggest that vasopressin plays a prominent role in morphine treatment and withdrawal-induced acute hormonal changes, but does not affect development of chronic hyperactivity of the HPA axis." @default.
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- W2104838175 date "2007-10-16" @default.
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- W2104838175 title "Congenital vasopressin deficiency and acute and chronic opiate effects on hypothalamo-pituitary–adrenal axis activity in Brattleboro rats" @default.
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- W2104838175 doi "https://doi.org/10.1677/joe-07-0356" @default.
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