Abstract
The aim of this article was to describe the effects of chronic fluoxetine on mu opioid receptor expression in obese Zucker rat extrahypothalamic regions. Male obese Zucker (fa/fa) rats were administered with fluoxetine (10 mg/kg; i.p.) daily for two weeks. Brain regional immunostaining for mu opioid receptor was carried out. An increase in the numbers of neural cells immunostained for mu opioid receptor in caudatus-putamen, dentate gyrus, lateral septum, amygdala, and frontal, parietal, and piriform cortices was observed. Increased mu opioid receptor expression in the central amygdaloid nuclei suggests a decreased opioidergic tone at this level that could be involved in fluoxetine anorectic action.
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