Effects of fluoxetine administration on hypothalamic melanocortin system in obese Zucker rats.

Abstract:

:The aim of the present work was to study the potential involvement of melanocortin system in the anorectic mechanism of fluoxetine, a selective serotonin reuptake inhibitors, in obese Zucker rats. Male obese Zucker (fa/fa) rats were administered fluoxetine (10 mg/kg; i.p.) daily for two weeks. The control group was given 0.9% NaCl solution. RT-PCR for pro-opiomelanocortin (POMC), Agouti gene related peptide (AgRP) and melanocortin receptor 4 (MC4-R) in the hypothalamus, as well as regional immunostaining for alpha-melanocyte stimulating hormone (alpha-MSH) and MC4-R were carried out. Fluoxetine administration increased POMC expression and reduced MC4-R expression in the hypothalamus, without changes in AgRP mRNA levels. Moreover, an increase in the numbers of alpha-MSH positively immunostained neural cells in the hypothalamic arcuate nucleus (ARC), as well as a significant decrease in the numbers of neural cells positively immunostained for MC4-R in the paraventricular nucleus (PVN), without changes in lateral hypothalamic area (LHA), were observed. These results suggest the involvement of alpha-MSH in central fluoxetine anorectic action.

journal_name

Neuropeptides

journal_title

Neuropeptides

authors

Churruca I,Portillo MP,Casis L,Gutiérrez A,Macarulla MT,Echevarría E

doi

10.1016/j.npep.2008.02.002

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

293-9

issue

3

eissn

0143-4179

issn

1532-2785

pii

S0143-4179(08)00026-7

journal_volume

42

pub_type

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