Opiate-induced hypersensitivity to testosterone feedback: pituitary involvement.


We have examined the mode of morphine's (M) action to increase the sensitivity of castrated male rats to the inhibitory feedback action of testosterone (T) on LH release. In castrated rats, sc implantation of M pellets or 5-mm long T-filled capsules (T5) failed to suppress LH release, but a combination of M and T5 drastically decreased serum LH levels… (More)


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