Hormonal signaling in the brain: radical shift in understanding information ...( at the axonal release sites. The imp...)

Hormonal signaling in the brain: radical shift in understanding information processing

at the axonal release sites. "The important new experiment here," he said, "was to find a link between endogenous alpha-MSH that is, alpha-MSH produced within the brain sexual behavior and oxytocin." Pairing sexually experienced male rats with sexually receptive females, the researchers injected a certain receptor antagonist (MC4) and then recorded their behavior.

All the control (non-treated) rats mated very rapidly. Of the rats injected with the receptor antagonist, about one-third showed no interest in mating. The others mated, but later when compared with the controls. Laboratory tests showed that the control rats had a lot of specific protein (Fos) in magnocellular oxytocin cells, less but some Fos in the antagonist-treated rats that mated late, but none at all in the antagonist-treated rats that didn't mate.

"These experiments provide pretty strong evidence that the effects of alpha-MSH on male sexual behavior are the result of OT release from the dendrites of the magnocellular neurons," Leng stated. "More importantly to me at least, they show that inside the brain there is a system of alpha-MSH-producing neurons that plays a key role in regulating sex drive," Leng concluded. In a broader sense, he added, "it also shows that alpha-MSH can act as a kind of 'switch' to change the site of oxytocin's release, either to the brain, or to the blood where it circulates to the body's periphery."

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19-Jul-2005

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