Add time:08/25/2019 Source:sciencedirect.com
mefenorex (cas 17243-57-1), used for 20 years as an anorexic drug, has not been studied so far with regard to its central mechanism of action, although its chemical structure suggests a serotonergic mechanism. In the present study, the effect of mefenorex on serotonin (5-HT) release was investigated both in vitro, on rat hypothalamic slices and in vivo, using microdialysis in the paraventricular (PVN)-ventromedian (VMM) hypothalamic area while mefenorex was applied locally by means of counterdialysis. In vitro, mefenorex increased the spontaneous release of 3H 5-HT from hypothalamic slices but not the electrically evoked release. This suggests a 5-HT releasing action of mefenorex not mediated through the terminal autoreceptor. The in vivo study confirmed the enhanced release and provided additional information. The delayed and modest increase of the 5-HT intracellular metabolite 5-HIAA may be indicative of an inhibition of reuptake. The dopaminergic system was also, but more modestly, activated by mefenorex. The increase in 5-HT release together with the inhibition of its reuptake may represent the main mechanism of action of mefenorex, and the secondary activation of the dopaminergic system may contribute in its anorexigenic effect at the level of the PVN-VMH area.
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