The role of substance P in the maintenance of colonic hypermotility induced by repeated stress in rats
Abstract
Background The mechanism underlying chronic stress-induced gastrointestinal (GI) dysmotility has not been fully elucidated and GI hormones have been indicated playing a role in mediating stress-induced changes in GI motor function.Aims Our objective was to study the possible role of substance P (SP) in the colonic hypermotility induced by repeated water avoidance stress (WAS) which mimics irritable bowel syndrome.Methods Male Wistar rats were submitted to WAS or sham WAS (SWAS) (1h/day) for up to 10 consecutive days. Enzyme Immunoassay Kit was used to detect the serum level of SP. The expression of neurokinin-1 receptor (NK1R) was investigated by Immunohistochemistry and Western blotting. The spontaneous contraction of muscle strip was studied in an organ bath system. L-type calcium channel currents (ICa,L) of smooth muscle cells (SMCs) were recorded by whole-cell patch-clamp technique.Results Fecal pellet expulsion and spontaneous contraction of proximal colon in rats were increased after repeated WAS. The serum level of SP was elevated following WAS. Immunohistochemistry proved the expression of NK1R in mucosa, muscularis and myenteric plexus. Western blotting demonstrated stress-induced up-regulation of NK1R in colon devoid of mucosa and submucosa. Repeated WAS increased the contractile activities of longitudinal muscle and circular muscle strips induced by SP and this effect was reversed by a selective NK1R antagonist. The ICa,L of SMCs in the WAS rats were drastically increased compared to controls after addition of SP.Conclusions Increased serum SP level and up-regulated NK1R in colon may contribute to stress-induced colonic hypermotility. And L-type calcium channels play a potentially important role in the process of WAS-induced dysmotility.
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Increased local production of estrogen and proinflammatory cytokines may induce NK1R in myometrium, causing uterine hyperactivity and subsequently pain.
“This may suggest that increased local production of estrogen and proinflammatory cytokines may induce NK1R in myometrium, causing uterine hyperactivity and, subsequently, pain, as in colon72,73.”
From Neuropeptides Substance P and Calcitonin Gene Related Peptide Accelerate the Development and Fibrogenesis of Endometriosis (2019) · cites this paper as [73]
NK1R antagonism reduces anxiety and emotional arousal circuit response to noxious visceral distension in women with irritable bowel syndrome.
“Moreover, NK1R antagonism has been shown to reduce anxiety and emotional arousal circuit response to noxious visceral distension in women with irritable bowel syndrome107, which is likely attributable, at least in part, to increased colonic hypermotility induced by SP and NK1R activation72,73.”
From Neuropeptides Substance P and Calcitonin Gene Related Peptide Accelerate the Development and Fibrogenesis of Endometriosis (2019) · cites this paper as [73]
Water avoidance stress (WAS)-induced colonic hypermotility is probably dependent on the upregulation of the neurokinin-1 receptor (NK1R) in the colon and increased serum SP levels, suggesting a potential mechanism for diarrhea in IBD patients with anxiety or depression.
“Another study revealed that water avoidance stress (WAS)-induced colonic hypermotility is probably dependent on the upregulation of the neurokinin-1 receptor (NK1R) in the colon and increased serum SP levels, suggesting a potential mechanism for diarrhea in IBD patients with anxiety or depression (41).”
From Stress triggers flare of inflammatory bowel disease in children and adults (2019) · cites this paper as [41]
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Stress triggers flare of inflammatory bowel disease in children and adults
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- Authors
- Lu, P., Luo, H., Quan, X., Fan, H., Tang, Q., Yu, G., Chen, W., & Xia, H.
- Affiliations
- Renmin Hospital of Wuhan University (CN)
- Corresponding author
- Luo, Hesheng
- Venue
- Neuropeptides
- Publisher
- Elsevier BV
- Published
- 2016-04
- Volume
- 56
- Pages
- 75-82
- ISSN
- 0143-4179 (ISSN-L)
- OpenAlex
- W2268600191
- Cited by
- 11
- References
- 40
- Citations by year
- 2024: 1 · 2023: 3 · 2022: 1 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 1
- FWCI
- 1.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neuropeptides (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Natural Science Foundation of Hubei Province (2013CFA128)
- Topics
- Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
- Health Sciences › Medicine › Surgery › Congenital gastrointestinal and neural anomalies
- Keywords
- substance P, chronic stress, water avoidance stress, irritable bowel syndrome, neurokinin-1 receptor, L-type calcium channels, smooth muscle contraction, gastrointestinal motility disorders, NK1 receptor antagonists, myenteric plexus
- MeSH terms
- Animals, Colon, Gastrointestinal Motility, Male, Muscle, Smooth, Myenteric Plexus, Stress, Psychological, Substance P, Rats, Wistar, Receptors, Neurokinin-1, Receptors, Neurokinin-2, Calcium Channels, L-Type, Rats
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