nutrients-14-01235-v2.pdf (1.09 MB)
Endogenous androgens diminish food intake and activation of orexin A neurons in response to reduced glucose availability in male rats
journal contribution
posted on 2023-06-10, 03:40 authored by Akira Takamata, Yuri Nishimura, Ayano Oka, Mayuna Nagata, Natsumi Kosugi, Sayaka Eguchi, Hiroko Negishi, Keiko MorimotoSex steroids modify feeding behavior and body weight regulation, and androgen reportedly augments food intake and body weight gain. To elucidate the role of endogenous androgens in the feeding regulation induced by reduced glucose availability, we examined the effect of gonadectomy (orchiectomy) on food intake and orexin A neuron’s activity in the lateral hypothalamic/perifornical area (LH/PFA) in response to reduced glucose availability (glucoprivation) induced by 2-deoxy-d-glucose (2DG) administration in male rats. Rats (7W) were bilaterally orchiectomized (ORX group) or sham operated (Sham group). Seventeen days after the surgery, food intake response to 2DG (400 mg/kg, i.v.) was measured for 4 h after the infusion. The same experiment was performed for the immunohistochemical examination of c-Fos-expressing orexin A neurons in the LH/PFA and c-Fos expression in the arcuate nucleus (Arc). Food intake induced by glucoprivation was greater in the ORX group than the Sham group, and the glucoprivation-induced food intake was inversely correlated with plasma testosterone concentration. Glucoprivation stimulated c-Fos expression of the orexin A neurons at the LH/PFA and c-Fos expression in the dorsomedial Arc. The number and percentage of c-Fos-expressing orexin A neurons in the LH/PFA and c-Fos expression in the dorsomedial Arc were significantly higher in the ORX group than the Sham group. This indicates that endogenous androgen, possibly testosterone, diminishes the food intake induced by reduced glucose availability, possibly via the attenuated activity of orexin A neuron in the LH/PFA and neurons in the dorsomedial Arc.
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Publication status
- Published
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- Published version
Journal
NutrientsISSN
2072-6643Publisher
MDPIExternal DOI
Issue
6Volume
14Page range
1-11Article number
a1235Event location
SwitzerlandDepartment affiliated with
- Neuroscience Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2022-05-26First Open Access (FOA) Date
2022-05-26First Compliant Deposit (FCD) Date
2022-05-26Usage metrics
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