PuSH - Publikationsserver des Helmholtz Zentrums München: GABAergic disinhibition from the BNST to PNOC<sup>ARC</sup> neurons promotes HFD-induced hyperphagia.

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Sotelo-Hitschfeld, T.* ; Minère, M.* ; Klemm, P.* ; Borgmann, D.* ; Wnuk-Lipinski, D.* ; Jais, A. ; Jia, X.* ; Corneliussen, S.* ; Kloppenburg, P.* ; Fenselau, H.* ; Brüning, J.C.*

GABAergic disinhibition from the BNST to PNOC^ARC neurons promotes HFD-induced hyperphagia.

Cell Rep. 43:114343 (2024)

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Activation of prepronociceptin (PNOC)-expressing neurons in the arcuate nucleus (ARC) promotes high-fat-diet (HFD)-induced hyperphagia. In turn, PNOC^ARC neurons can inhibit the anorexic response of proopiomelanocortin (POMC) neurons. Here, we validate the necessity of PNOC^ARC activity for HFD-induced inhibition of POMC neurons in mice and find that PNOC^ARC-neuron-dependent inhibition of POMC neurons is mediated by gamma-aminobutyric acid (GABA) release. When monitoring individual PNOC^ARC neuron activity via Ca²⁺ imaging, we find a subpopulation of PNOC^ARC neurons that is inhibited upon gastrointestinal calorie sensing and disinhibited upon HFD feeding. Combining retrograde rabies tracing and circuit mapping, we find that PNOC neurons from the bed nucleus of the stria terminalis (PNOC^BNST) provide inhibitory input to PNOC^ARC neurons, and this inhibitory input is blunted upon HFD feeding. This work sheds light on how an increase in caloric content of the diet can rewire a neuronal circuit, paving the way to overconsumption and obesity development.

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PuSH - Publikationsserver des Helmholtz Zentrums München

GABAergic disinhibition from the BNST to PNOCARC neurons promotes HFD-induced hyperphagia.

GABAergic disinhibition from the BNST to PNOC^ARC neurons promotes HFD-induced hyperphagia.