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Barkholt P, Pedersen PJ, Hay-Schmidt A, et al. Alterations in hypothalamic gene expression following Roux-en-Y gastric bypass. Mol Metab. 2016;5(4):296-304doi: 10.1016/j.molmet.2016.01.006.
Barkholt, P., Pedersen, P. J., Hay-Schmidt, A., Jelsing, J., Hansen, H. H., & Vrang, N. (2016). Alterations in hypothalamic gene expression following Roux-en-Y gastric bypass. Molecular metabolism, 5(4), 296-304. https://doi.org/10.1016/j.molmet.2016.01.006
Barkholt, Pernille, et al. "Alterations in hypothalamic gene expression following Roux-en-Y gastric bypass." Molecular metabolism vol. 5,4 (2016): 296-304. doi: https://doi.org/10.1016/j.molmet.2016.01.006
Barkholt P, Pedersen PJ, Hay-Schmidt A, Jelsing J, Hansen HH, Vrang N. Alterations in hypothalamic gene expression following Roux-en-Y gastric bypass. Mol Metab. 2016 Jan 25;5(4):296-304. doi: 10.1016/j.molmet.2016.01.006. eCollection 2016 Apr. PMID: 27069869; PMCID: PMC4811984.
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Mol Metab. 2016 Jan 25;5(4):296-304. doi: 10.1016/j.molmet.2016.01.006. eCollection 2016 Apr.

Alterations in hypothalamic gene expression following Roux-en-Y gastric bypass.

Molecular metabolism

Pernille Barkholt, Philip J Pedersen, Anders Hay-Schmidt, Jacob Jelsing, Henrik H Hansen, Niels Vrang

Affiliations

  1. Gubra, Agern Alle 1, 2970 Hørsholm, Denmark; Department of Neuroscience and Pharmacology, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark. Electronic address: [email protected].
  2. Gubra, Agern Alle 1, 2970 Hørsholm, Denmark.
  3. Department of Neuroscience and Pharmacology, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark.

PMID: 27069869 PMCID: PMC4811984 DOI: 10.1016/j.molmet.2016.01.006

Abstract

OBJECTIVE: The role of the central nervous system in mediating metabolic effects of Roux-en-Y gastric bypass (RYGB) surgery is poorly understood. Using a rat model of RYGB, we aimed to identify changes in gene expression of key hypothalamic neuropeptides known to be involved in the regulation of energy balance.

METHODS: Lean male Sprague-Dawley rats underwent either RYGB or sham surgery. Body weight and food intake were monitored bi-weekly for 60 days post-surgery. In situ hybridization mRNA analysis of hypothalamic AgRP, NPY, CART, POMC and MCH was applied to RYGB and sham animals and compared with ad libitum fed and food-restricted rats. Furthermore, in situ hybridization mRNA analysis of dopaminergic transmission markers (TH and DAT) was applied in the midbrain.

RESULTS: RYGB surgery significantly reduced body weight and intake of a highly palatable diet but increased chow consumption compared with sham operated controls. In the arcuate nucleus, RYGB surgery increased mRNA levels of orexigenic AgRP and NPY, whereas no change was observed in anorexigenic CART and POMC mRNA levels. A similar pattern was seen in food-restricted versus ad libitum fed rats. In contrast to a significant increase of orexigenic MCH mRNA levels in food-restricted animals, RYGB did not change MCH expression in the lateral hypothalamus. In the VTA, RYGB surgery induced a reduction in mRNA levels of TH and DAT, whereas no changes were observed in the substantia nigra relative to sham surgery.

CONCLUSION: RYGB surgery increases the mRNA levels of hunger-associated signaling markers in the rat arcuate nucleus without concomitantly increasing downstream MCH expression in the lateral hypothalamus, suggesting that RYGB surgery puts a brake on orexigenic hypothalamic output signals. In addition, down-regulation of midbrain TH and DAT expression suggests that altered dopaminergic activity also contributes to the reduced intake of palatable food in RYGB rats.

Keywords: Energy homeostasis; Hedonic; Hypothalamus; Mesolimbic pathway; Roux-en-Y gastric bypass

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