Hypothalamic galanin and early state of hyperphagia in obese Zucker rats.

Abstract:

:Galanin (GAL) stimulates food intake in normal rats when it is injected in different hypothalamic areas involved in feeding such as the paraventricular and ventromedial nuclei and the lateral hypothalamus. At adulthood, the hyperphagic obese Zucker rat is characterized by a general dysregulation of some important neuropeptides involved in the regulation of food intake including GAL. The aim of this study was to measure GAL in different microdissected brain areas in 2- and 4-week-old lean (FA/-) and obese (fa/fa) male Zucker rats in order to know if GAL actively participates in triggering abnormal feeding behavior in obese rats. There was a significant increase (40%-220%) in GAL concentration with age in the arcuate and dorsomedial nuclei and in the above areas except for the lateral hypothalamus. Genotype differences were observed in the arcuate and paraventricular nuclei only. GAL levels were globally lower in obese than in lean rats (-15% to -25%) and the difference was significant at 2 weeks of age in the paraventricular nucleus and at 4 weeks of age in the arcuate nucleus. In agreement with human observations, these data suggest that GAL is not an early player in the development of overeating.

journal_name

Appetite

journal_title

Appetite

authors

Beck B

doi

10.1016/j.appet.2006.09.005

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

206-10

issue

2

eissn

0195-6663

issn

1095-8304

pii

S0195-6663(06)00602-7

journal_volume

48

pub_type

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