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Sex differences in activation of extra-hypothalamic forebrain areas during hedonic eating

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Abstract

Palatable foods can stimulate appetite without hunger, and unconstrained overeating underlies obesity and binge eating disorder. Women are more prone to obesity and binge eating than men but the neural causes of individual differences are unknown. In an animal model of hedonic eating, a prior study found that females were more susceptible than males to eat palatable food when sated and that the neuropeptide orexin/hypocretin (ORX) was crucial in both sexes. The current study examined potential extra-hypothalamic forebrain targets of ORX signaling during hedonic eating. We measured Fos induction in the cortical, thalamic, striatal, and amygdalar areas that receive substantial ORX inputs and contain their receptors in hungry and sated male and female rats during palatable (high-sucrose) food consumption. During the test, hungry rats of both sexes ate substantial amounts, and while sated males ate much less than hungry rats, sated females ate as much as hungry rats. The Fos induction analysis identified sex differences in recruitment of specific areas of the medial prefrontal cortex, paraventricular nucleus of the thalamus (PVT), nucleus accumbens (ACB), and central nucleus of the amygdala (CEA), and similar patterns across sexes in the insular cortex. There was a striking activation of the infralimbic cortex in sated males, who consumed the least amount food and unique correlations between the insular cortex, PVT, and CEA, as well as the prelimbic cortex, ACB, and CEA in sated females but not sated males. The study identified key functional circuits that may drive hedonic eating in a sex-specific manner.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Institutes of Health, NIDDK grant R01DK085721 to GDP. We thank Dr. Ehri Ryu for helpful advice regarding statistical analyses.

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GDP conceptualized the study and supervised the experiments and directed the data analysis. GDP, LB and JM designed the experiments. LB and JM carried out the experiment. WP, EG, LB, JM, EC, AMKM conducted the histological preparation and analyses. WP and EG prepared the figures. WP and GDP wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Gorica D. Petrovich.

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Parsons, W., Greiner, E., Buczek, L. et al. Sex differences in activation of extra-hypothalamic forebrain areas during hedonic eating. Brain Struct Funct 227, 2857–2878 (2022). https://doi.org/10.1007/s00429-022-02580-0

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