Sex differences in the responses of orexin neurons in the lateral hypothalamic area and feeding behavior to fasting.

Abstract:

:Because there are sex differences in feeding-related behavior and orexin neurons are involved in feeding, we looked for a possible sex difference in the response of orexin neurons in the lateral hypothalamic area to fasting, using the phosphorylated cyclic AMP response element-binding protein (pCREB) as a marker of neural activity. Intact male and female rats at proestrus, estrus, or diestrus, were fed normally or fasted for 48h. After fasting, they were intravenously injected with saline or glucose and subjected to immunohistochemical processing for the detection of orexin and pCREB. In the rats fed normally and injected with saline, only a small population of orexin neurons expressed pCREB in both male and female rats. However, fasting increased the number of orexin neurons with pCREB (double-stained cells) in female rats regardless of the estrous day but not in male rats, revealing a significant sex difference in the response of orexin neurons to fasting. Glucose injection in fasted rats decreased the number of double-stained cells in female rats, and the magnitude of glucose-dependent decrease was greater at proestrus and estrus than at diestrus 2. We also found that female rats, but not male rats, showed an increase in total food intake after fasting (rebound feeding). We speculate that the demonstrated sex differences in the response of orexin neurons to fasting reflect the vulnerability of feeding mechanisms in females.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Funabashi T,Hagiwara H,Mogi K,Mitsushima D,Shinohara K,Kimura F

doi

10.1016/j.neulet.2009.07.035

subject

Has Abstract

pub_date

2009-09-29 00:00:00

pages

31-4

issue

1

eissn

0304-3940

issn

1872-7972

pii

S0304-3940(09)00954-9

journal_volume

463

pub_type

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