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Affiliation(s)
- Kyle Ratcliff
- Department of Psychiatry, Flinders University, College of Medicine and Public Health, South Australia, Australia.,Corresponding author: Kyle Ratcliff, MD, Flinders Medical Centre, Flinders Drive, Bedford Park, SA, Australia 5042
| | - Vineet Juneja
- Department of Psychiatry, Flinders University, College of Medicine and Public Health, South Australia, Australia
| | - Arun Gupta Mbbs
- Department of Psychiatry, Flinders University, College of Medicine and Public Health, South Australia, Australia
| | - Tarun Bastiampillai
- Department of Psychiatry, Flinders University, College of Medicine and Public Health, South Australia, Australia.,Department of Psychiatry, Monash University, Faculty of Medicine, Nursing and Health Sciences, Victoria, Australia
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Kentish SJ, Ratcliff K, Li H, Wittert GA, Page AJ. High fat diet induced changes in gastric vagal afferent response to adiponectin. Physiol Behav 2015; 152:354-62. [PMID: 26074203 DOI: 10.1016/j.physbeh.2015.06.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 05/28/2015] [Accepted: 06/10/2015] [Indexed: 01/14/2023]
Abstract
Food intake is regulated by vagal afferent signals from the stomach. Adiponectin, secreted primarily from adipocytes, also has a role in regulating food intake. However, the involvement of vagal afferents in this effect remains to be established. We aimed to determine if adiponectin can modulate gastric vagal afferent (GVA) satiety signals and further whether this is altered in high fat diet (HFD)-induced obesity. Female C57BL/6J mice were fed either a standard laboratory diet (SLD) or a HFD for 12weeks. Plasma adiponectin levels were assayed, and the expression of adiponectin in the gastric mucosa was assessed using real-time quantitative reverse-transcription polymerase chain reaction (qRT-PCR). The location of adiponectin protein within the gastric mucosa was determined by immunohistochemistry. To evaluate the direct effect of adiponectin on vagal afferent endings we determined adiponectin receptor expression in whole nodose ganglia (NDG) and also specifically in GVA neurons using retrograde tracing and qRT-PCR. An in vitro preparation was used to determine the effect of adiponectin on GVA response to mechanical stimulation. HFD mice exhibited an increased body weight and adiposity and showed delayed gastric emptying relative to SLD mice. Plasma adiponectin levels were not significantly different in HFD compared to SLD mice. Adiponectin mRNA was detected in the gastric mucosa of both SLD and HFD mice and presence of protein was confirmed immunohistochemically by the detection of adiponectin immunoreactive cells in the mucosal layer of the stomach. Adiponectin receptor 1 (ADIPOR1) and 2 (ADIPOR2) mRNA was present in both the SLD and HFD whole NDG and also specifically traced gastric mucosal and muscular neurons. There was a reduction in ADIPOR1 mRNA in the mucosal afferents of the HFD mice relative to the SLD mice. In HFD mice adiponectin potentiated gastric mucosal afferent responses to mucosal stroking, an effect not observed in SLD mice. Adiponectin reduced the responses of tension receptors to circular stretch to a similar extent in both SLD and HFD mice. In conclusion, adiponectin modulates GVA satiety signals. This modulatory effect is altered in HFD-induced obesity. It remains to be conclusively determined whether this modulation is involved in the regulation of food intake and what the whole animal phenotypic consequence is.
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Affiliation(s)
- Stephen J Kentish
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Discipline of Medicine, University of Adelaide, Frome Road, Adelaide, SA 5005, Australia; Nutrition and Metabolism, South Australian Health and Medical Research Institute, North Terrace, SA 5000, Australia.
| | - Kyle Ratcliff
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Discipline of Medicine, University of Adelaide, Frome Road, Adelaide, SA 5005, Australia
| | - Hui Li
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Discipline of Medicine, University of Adelaide, Frome Road, Adelaide, SA 5005, Australia
| | - Gary A Wittert
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Discipline of Medicine, University of Adelaide, Frome Road, Adelaide, SA 5005, Australia; Nutrition and Metabolism, South Australian Health and Medical Research Institute, North Terrace, SA 5000, Australia; Royal Adelaide Hospital, North Terrace, Adelaide, SA 5000, Australia
| | - Amanda J Page
- Vagal Afferent Research Group, Centre for Nutrition and Gastrointestinal Disease, Discipline of Medicine, University of Adelaide, Frome Road, Adelaide, SA 5005, Australia; Nutrition and Metabolism, South Australian Health and Medical Research Institute, North Terrace, SA 5000, Australia; Royal Adelaide Hospital, North Terrace, Adelaide, SA 5000, Australia
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