Abstract
Despite significant progress in understanding the homeostatic regulation of energy balance, successful therapeutic options for curbing obesity remain elusive. One potential target for the treatment of obesity is via manipulation of the gut–brain axis, a complex bidirectional communication system that is crucial in maintaining energy homeostasis. Indeed, ingested nutrients induce secretion of gut peptides that act either via paracrine signaling through vagal and non-vagal neuronal relays, or in an endocrine fashion via entry into circulation, to ultimately signal to the central nervous system where appropriate responses are generated. We review here the current hypotheses of nutrient sensing mechanisms of enteroendocrine cells, including the release of gut peptides, mainly cholecystokinin, glucagon-like peptide-1, and peptide YY, and subsequent gut-to-brain signaling pathways promoting a reduction of food intake and an increase in energy expenditure. Furthermore, this review highlights recent research suggesting this energy regulating gut–brain axis can be influenced by gut microbiota, potentially contributing to the development of obesity.
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Abbreviations
- AgRP:
-
Agouti-related protein
- AEA:
-
Anadamide
- ARC:
-
Arcuate nucleus
- BAT:
-
Brown adipose tissue
- BDNF:
-
Brain-derived neurotrophic factor
- CB1 :
-
Cannabinoid receptor 1
- CCK:
-
Cholecystokinin
- CCK-1R:
-
CCK-1 receptor
- CNS:
-
Central nervous system
- DVC:
-
Dorsal vagal complex
- ENS:
-
Enteric nervous system
- EEC:
-
Enteroendocrine cell
- GI:
-
Gastrointestinal
- GF:
-
Germ free
- GLP-1:
-
Glucagon-like peptide 1
- GLP-1R:
-
GLP-1 receptor
- GPR:
-
G-coupled protein receptor
- IP:
-
Intraperitoneal
- KO:
-
Knockout
- LPS:
-
Lipopolysaccharide
- NPY:
-
Neuropeptide Y
- NTS:
-
Nucleus tractus solitarius
- OTU:
-
Operational taxonomic unit
- OXM:
-
Oxyntomodulin
- PVN:
-
Paraventricular nucleus
- PYY:
-
Peptide YY
- TLR:
-
Toll-like receptor
- Y2R:
-
Y2 receptor
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Bauer, P.V., Hamr, S.C. & Duca, F.A. Regulation of energy balance by a gut–brain axis and involvement of the gut microbiota. Cell. Mol. Life Sci. 73, 737–755 (2016). https://doi.org/10.1007/s00018-015-2083-z
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DOI: https://doi.org/10.1007/s00018-015-2083-z