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Learning of food preferences: mechanisms and implications for obesity & metabolic diseases
Berthoud HR, Morrison CD, Ackroff K, Sclafani A (2021) Learning of food preferences: mechanisms and implications for obesity & metabolic diseases. Int J Obes (Lond) 45(10):2156-2168. doi: 10.1038/s41366-021-00894-3
Objective: This review focuses on postoral nutrient sensing and signaling as an essential part of the reward system that shapes preferences for the associated flavors of foods.
Summary: There is a critical role for the vagal gut-to-brain axis in motivation and reward. An implication for obesity treatment is that bariatric surgery may alter vagal function.
Usage: Han et al. injected 0.5 µl of CCK-SAP (250 ng/µl) into the R-NG of VGlut2-ires-Cre mice.
See: Han W et al. A Neural Circuit for Gut-Induced Reward. Cell 175:665-678, 2018.
Related Products: CCK-SAP (Cat. #IT-31)
Dissection and surgical approaches to the mouse jugular-nodose ganglia
Han W, de Araujo IE (2021) Dissection and surgical approaches to the mouse jugular-nodose ganglia. STAR Protocols 2(2):100474. doi: 10.1016/j.xpro.2021.100474
Usage: Injected 0.5 µl of CCK-SAP (250 ng/µl) into the R-NG of VGlut2-ires-Cre mice.
Related Products: CCK-SAP (Cat. #IT-31)
For complete details on the use and execution of this protocol, please refer to Han et al.
See Also: Han W et al. A neural circuit for gut-induced reward. Cell 175:665-678, 2018.
Vagotomy and insights into the microbiota-gut-brain axis
Liu Y, Forsythe P (2021) Vagotomy and insights into the microbiota-gut-brain axis. Neurosci Res 168:20-27. doi: 10.1016/j.neures.2021.04.001
Objective: To review the use of vagotomy as a tool to explore the role of the vagus nerve in gut to brain signaling.
Summary: This review article is a summary of the knowledge gained from vagotomy, a surgical procedure that involves removing part of the vagus nerve. The article discusses using CCK-SAP to specifically ablate afferent vagal nerves in the gastrointestinal tract.
Usage: The article references a study by Diepenbroek et al. that used CCK-SAP in the following dosages: In vitro: each well was treated with a different dose of saporin conjugates (0, 2.4, 24, or 240 ng) for 24 h. In vivo: An equal volume (rat: 1 µl; mouse: 0.5 µl) of CCK-SAP (250 ng/µl) or Saporin (250 ng/µl) was injected at two sites rostral and caudal to the laryngeal nerve branch.
Related Products: CCK-SAP (Cat. #IT-31), Saporin (Cat. #PR-01)
See Also:
Intact vagal gut-brain signalling prevents hyperphagia and excessive weight gain in response to high-fat high-sugar diet.
McDougle M, Quinn D, Diepenbroek C, Singh A, de la Serre C, de Lartigue G (2021) Intact vagal gut-brain signalling prevents hyperphagia and excessive weight gain in response to high-fat high-sugar diet. Acta Physiol (Oxf) 231(3):e13530. doi: 10.1111/apha.13530
Objective: To assess the function of the vagus nerve lack specificity.
Summary: Intact sensory vagal neurons prevent hyperphagia and exacerbation of weight gain in response to a HFHS diet by promoting lipid-mediated satiation.
Usage: Rat nodose ganglia were injected bilaterally with either CCK-SAP or unconjugated saporin as a control.
Related Products: CCK-SAP (Cat. #IT-31)
From obesity to hippocampal neurodegeneration: Pathogenesis and non-pharmacological interventions
Lee TH, Yau SY (2021) From obesity to hippocampal neurodegeneration: Pathogenesis and non-pharmacological interventions. Int J Mol Sci 22(1):201. doi: 10.3390/ijms22010201
Summary: This review provides insights into how chronic metabolic disorders, like obesity, could impair brain health and cognitive functions in later life. The authors reference the use of CCK-SAP into the nodose ganglia to impair spatial memory and contextual episodic memory.
Related Products: CCK-SAP (Cat. #IT-31)
Intestinal glucagon-like peptide-1 effects on food intake: Physiological relevance and emerging mechanisms
Krieger JP (2020) Intestinal glucagon-like peptide-1 effects on food intake: Physiological relevance and emerging mechanisms. Peptides 131:170342. doi: 10.1016/j.peptides.2020.170342 PMID: 32522585
Objective: Review of findings of GLP-1 involvement in obesity.
Summary: The most selective method of gastrointestinal vagal deafferentation to date used CCK-SAP injected into the nodose ganglia which blunts the anorexigenic effect of IP GLP-1 administration.
Related Products: CCK-SAP (Cat. #IT-31)
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OP11: Role of spinal cholecystokinin receptor 2 in alloknesis models.
Tominaga M, Kusube F, Honda K, Komiya E, Takahashi N, Naito H, Suga Y, Takamori K (2019) OP11: Role of spinal cholecystokinin receptor 2 in alloknesis models. Itch 4:1-62. doi: 10.1097/itx.0000000000000030
Objective: To determine the detailed molecular and cellular mechanisms that induce alloknesis via the spinal CCK2 receptor.
Summary: Ablation of spinal CCK receptor-expressing cells by i.t. injection of CCK-SAP attenuated CCK8S-induced alloknesis in comparison with Blank-SAP control mice.
Usage: Intrathecal injection
Related Products: CCK-SAP (Cat. #IT-31), Blank-SAP (Cat. #IT-21)
Medial septum cholinergic signaling regulates gastrointestinal-derived vagus sensory nerve communication to the hippocampus
Suarez AN, Liu CM, Cortella AM, Noble EN, Kanoski SE (2019) Medial septum cholinergic signaling regulates gastrointestinal-derived vagus sensory nerve communication to the hippocampus. Neuroscience 2019 Abstracts 601.19. Society for Neuroscience, Chicago, IL.
Summary: The vagus nerve delivers bi-directional communication between feeding-relevant gastrointestinal (GI) signals and the brain. Vagal sensory-mediated GI satiation signals, including gastric distension and intra-gastric nutrient infusion, activate neurons in the hippocampus (HPC). Recent work from our lab revealed that selective GI-derived vagal sensory signaling is required for HPC-dependent episodic and visuospatial memory, effects accompanied by reduced dorsal HPC (dHPC) expression of neurotrophic and neurogenic markers. To investigate the neural pathways mediating gut regulation of hippocampal-dependent memory, here we investigate the hypothesis that GI-derived signals communicate to dHPC neurons via cholinergic input from the medial septum, a memory-promoting pathway that is vulnerable to disruption in various degenerative dementia diseases. To explore this putative gut-to-brain pathway, we administered 192IgG-saporin, a neurotoxin that selectively kills cholinergic neurons via apoptosis, in the medial septum to determine whether septal cholinergic neurons regulate vagally-mediated neuronal activation in dHPC. Results revealed that elimination of cholinergic neurons in the MS reduced peripherally-administered cholecystokinin (CCK)-induced c-Fos expression in the dHPC, suggesting that cholinergic inputs from the MS transmit GI-derived signaling to the dHPC. Consistent with this interpretation, dHPC protein expression of vesicular acetylcholine transporter (VAChT), which promotes memory function and acetylcholine release without disrupting other co- released molecules, was significantly reduced in rats with GI-specific vagal sensory ablation via nodose ganglion injections of CCK conjugated to saporin. Collectively these results suggest that GI-derived vagal sensory signaling infuences memory function via enhancement of MS cholinergic signaling to the dPHC.
Related Products: 192-IgG-SAP (Cat. #IT-01), CCK-SAP (Cat. #IT-31)
Regulation of memory function by feeding-relevant biological systems: Following the breadcrumbs to the hippocampus
Suarez AN, Noble EE, Kanoski SE (2019) Regulation of memory function by feeding-relevant biological systems: Following the breadcrumbs to the hippocampus. Front Mol Neurosci 12:101. doi: 10.3389/fnmol.2019.00101 PMID: 31057368
Objective: To review the literature describing interconnections between the memory and feeding circuits of the body.
Summary: Gastrointestinal and memory systems within the body are heavily intertwined, something that has been evolutionarily selected for by having to remember food locations, social factors, etc. CCK-SAP (IT-31) has been used to study the connection of gastrointestinal-derived vagal-sensory neurons by selectively lesioning them. These CCK-SAP-treated rats were compared to un-lesioned animals and showed reduced brain-derived neurotrophic factor and memory impairment
Related Products: CCK-SAP (Cat. #IT-31)
See Also:
A neural circuit for gut-induced reward
Han W, Tellez LA, Perkins MH, Perez IO, Qu T, Ferreira J, Ferreira TL, Quinn D, Liu Z-W, Gao X-B, Kaelberer MM, Bohórquez DV, Shammah-Lagnado SJ, de Lartigue G, de Araujo IE (2018) A neural circuit for gut-induced reward. Cell 175:665-678. doi: 10.1016/j.cell.2018.08.049
Objective: To determine relevant gut-brain neuronal circuitry to motivational and emotional states.
Summary: There is a critical role for the vagal gut-to-brain axis in motivation and reward.
Usage: Injected 0.5 µl of CCK-SAP (250 ng/µl) into the R-NG of VGlut2-ires-Cre mice.
Related Products: CCK-SAP (Cat. #IT-31)