Abstract
Recent studies implicate TRPV4 receptors in visceral pain signaling and intestinal inflammation. Our aim was to evaluate the role of TRPV4 in the control of gastrointestinal (GI) motility and to establish the underlying mechanisms. We used immunohistochemistry and PCR to study TRPV4 expression in the GI tract. The effect of TRPV4 activation on GI motility was characterized using in vitro and in vivo motility assays. Calcium and nitric oxide (NO) imaging were performed to study the intracellular signaling pathways. Finally, TRPV4 expression was examined in the colon of healthy human subjects. We demonstrated that TRPV4 can be found on myenteric neurons of the colon and is co-localized with NO synthase (NOS-1). In vitro, the TRPV4 agonist GSK1016790A reduced colonic contractility and increased inhibitory neurotransmission. In vivo, TRPV4 activation slowed GI motility and reduced stool production in mouse models mimicking pathophysiological conditions. We also showed that TRPV4 activation inhibited GI motility by reducing NO-dependent Ca2+ release from enteric neurons. In conclusion, TRPV4 is involved in the regulation of GI motility in health and disease.
Key messages
• Recent studies implicate TRPV4 in pain signaling and intestinal inflammation.
• Our aim was to characterize the role of TRPV4 in the control of GI motility.
• We found that TRPV4 activation reduced colonic contractility.
• Our studies also showed altered TRPV4 mRNA expression in IBS-C patients.
• TRPV4 may be a novel pharmacological target in functional GI diseases.
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Abbreviations
- 1400W:
-
N-(3-Aminomethyl) benzylacetamidine, NOS-2 blocker
- EFS:
-
Electrical field stimulation
- GFAP:
-
Glial fibrillary acidic protein
- GSK1016790A:
-
(N-((1S)-1-{[4-((2S)-2-{[(2,4-Dichlorophenyl)sulfonyl]amino}-3-hydroxypropanoyl)-1-piperazinyl]carbonyl}-3-methylbutyl)-1-benzothiophene-2-carboxamide, TRPV4 agonist
- IBS:
-
Irritable bowel syndrome
- LMMP:
-
Longitudinal muscle–myenteric plexus
- NANC:
-
Non-adrenergic, non-cholinergic
- ODQ:
-
1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one, soluble guanylate cyclase inhibitor
- PTIO:
-
2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide, NO scavenger
- RN 1734:
-
2,4-Dichloro-N-isopropyl-N-(2-isopropylaminoethyl)benzenesulfonamide, TRPV4 antagonist
- RuR:
-
Ruthenium red, TRPV antagonist
- SB 366791:
-
4′-Chloro-3-methoxycinnamanilide, selective TRPV1 antagonist
- sGC:
-
Soluble guanylate cyclase
- SMTC:
-
S-Methyl-l-thiocitrulline, NOS-1 blocker
- TRPV4:
-
Transient receptor potential vanilloid type 4
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Acknowledgments
The authors wish to thank Dr. Kevin Thorneloe (GlaxoSmithKline Pharmaceuticals, King of Prussia, PA, USA) for providing GSK1016790A for this study, Wolfgang Liedtke (Duke University, Durham, NC, USA) for providing the TRPV4−/− mice, and Drs. Catherine Legraverend (Institut de Génomique Fonctionnelle, Montpellier, France) and Richard Dyck (University of Calgary, AB, Canada) for supplying the S100β-GFP mice. SJM was supported by the Dr. T. Chen Fong Doctoral Scholarship in Neuroscience through the Hotchkiss Brain Institute and a Studentship from Alberta Innovates-Health Solutions (AI-HS). KAS is the Crohn’s and Colitis Foundation of Canada Chair in IBD Research. Supported by the Iuventus Plus program of the Polish Ministry of Science and Higher Education (0107/IP1/2013/72 to JF), Medical University of Lodz (503/1-156-04/503-01 to JF), National Science Centre (UMO-2013/11/B/NZ7/01301 and UMO-2014/13/B/NZ4/01179 to JF), NHMRC (454858 to DPP and 63303 to NWB), NIH (DK57840 to NWB), Monash University (to NWB), the Canadian Institutes of Health Research (to KAS), the Deutsche Forschungsgemeinschaft (STO 645/6-1 to MS), and the University of Calgary Research Grant Committee (to MS).
Author contributions
Concept and design: JF, DPP, SJM, KAS, MAS
Analysis and interpretation of data: JF, DPP, NV, SJM, DS, AM, PKZ, AIC, JPT
Drafting the manuscript: JF, SJM, KAS, MAS
Final approval of the version to be published: all authors
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The authors have nothing to disclose.
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Fichna, J., Poole, D.P., Veldhuis, N. et al. Transient receptor potential vanilloid 4 inhibits mouse colonic motility by activating NO-dependent enteric neurotransmission. J Mol Med 93, 1297–1309 (2015). https://doi.org/10.1007/s00109-015-1336-5
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DOI: https://doi.org/10.1007/s00109-015-1336-5