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Wu WY, Lee SP, Chiang BJ, Lin WY, Chien CT. Urothelial Calcium-Sensing Receptor Modulates Micturition Function via Mediating Detrusor Activity and Ameliorates Bladder Hyperactivity in Rats. Pharmaceuticals (Basel) 2021; 14:ph14100960. [PMID: 34681183 PMCID: PMC8537609 DOI: 10.3390/ph14100960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/20/2021] [Accepted: 09/20/2021] [Indexed: 12/19/2022] Open
Abstract
The urothelium displays mechano- and chemosensory functions via numerous receptors and channels. The calcium-sensing receptor (CaSR) detects extracellular calcium and modulates several physiological functions. Nonetheless, information about the expression and the role of CaSR in lower urinary tract has been absent. We aimed to determine the existence of urothelial CaSR in urinary bladder and its effect on micturition function. We utilized Western blot to confirm the expression of CaSR in bladder and used immunofluorescence to verify the location of the CaSR in the bladder urothelium via colocalization with uroplakin III A. The activation of urothelial CaSR via the CaSR agonist, AC-265347 (AC), decreased urinary bladder smooth muscle (detrusor) activity, whereas its inhibition via the CaSR antagonist, NPS-2143 hydrochloride (NPS), increased detrusor activity in in vitro myography experiments. Cystometry, bladder nerve activities recording, and bladder surface microcirculation detection were conducted to evaluate the effects of the urothelial CaSR via intravesical administrations. Intravesical AC inhibited micturition reflex, bladder afferent and efferent nerve activities, and reversed cystitis-induced bladder hyperactivity. The urothelial CaSR demonstrated a chemosensory function, and modulated micturition reflex via regulating detrusor activity. This study provided further evidence of how the urothelial CaSR mediated micturition and implicated the urothelial CaSR as a potential pharmacotherapeutic target in the intervention of bladder disorders.
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Affiliation(s)
- Wei-Yi Wu
- Department of Life Science, School of Life Science, College of Science, National Taiwan Normal University, Taipei 11677, Taiwan;
| | - Shih-Pin Lee
- Department of Public Health, International College, Krirk University, Bangkok 10220, Thailand;
| | - Bing-Juin Chiang
- Department of Life Science, School of Life Science, College of Science, National Taiwan Normal University, Taipei 11677, Taiwan;
- College of Medicine, Fu-Jen Catholic University, New Taipei City 24205, Taiwan
- Department of Urology, Cardinal Tien Hospital, New Taipei City 23148, Taiwan
- Correspondence: (B.-J.C.); (W.-Y.L.); (C.-T.C.); Tel.: +886-2-77496312 (C.-T.C.)
| | - Wei-Yu Lin
- Department of Life Science, School of Life Science, College of Science, National Taiwan Normal University, Taipei 11677, Taiwan;
- Department of Urology, Ministry of Health and Welfare, Taipei Hospital, New Taipei City 24213, Taiwan
- Correspondence: (B.-J.C.); (W.-Y.L.); (C.-T.C.); Tel.: +886-2-77496312 (C.-T.C.)
| | - Chiang-Ting Chien
- Department of Life Science, School of Life Science, College of Science, National Taiwan Normal University, Taipei 11677, Taiwan;
- Correspondence: (B.-J.C.); (W.-Y.L.); (C.-T.C.); Tel.: +886-2-77496312 (C.-T.C.)
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Girard BM, Campbell SE, Perkins M, Hsiang H, Tooke K, Drescher C, Hennig GW, Heppner TJ, Nelson MT, Vizzard MA. TRPV4 blockade reduces voiding frequency, ATP release, and pelvic sensitivity in mice with chronic urothelial overexpression of NGF. Am J Physiol Renal Physiol 2019; 317:F1695-F1706. [PMID: 31630542 DOI: 10.1152/ajprenal.00147.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Transient receptor potential vanilloid family member 4 (TRPV4) transcript and protein expression increased in the urinary bladder and lumbosacral dorsal root ganglia of transgenic mice with chronic urothelial overexpression of nerve growth factor (NGF-OE). We evaluated the functional role of TRPV4 in bladder function with open-outlet cystometry, void spot assays, and natural voiding (Urovoid) assays with the TRPV4 antagonist HC-067047 (1 μM) or vehicle in NGF-OE and littermate wild-type (WT) mice. Blockade of TRPV4 at the level of the urinary bladder significantly (P ≤ 0.01) increased the intercontraction interval (2.2-fold) and void volume (2.6-fold) and decreased nonvoiding contractions (3.0-fold) in NGF-OE mice, with lesser effects (1.3-fold increase in the intercontraction interval and 1.3-fold increase in the void volume) in WT mice. Similar effects of TRPV4 blockade on bladder function in NGF-OE mice were demonstrated with natural voiding assays. Intravesical administration of HC-067047 (1 µM) significantly (P ≤ 0.01) reduced pelvic sensitivity in NGF-OE mice but was without effect in littermate WT mice. Blockade of urinary bladder TRPV4 or intravesical infusion of brefeldin A significantly (P ≤ 0.01) reduced (2-fold) luminal ATP release from the urinary bladder in NGF-OE and littermate WT mice. The results of the present study suggest that TRPV4 contributes to luminal ATP release from the urinary bladder and increased voiding frequency and pelvic sensitivity in NGF-OE mice.
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Affiliation(s)
- Beatrice M Girard
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Susan E Campbell
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Megan Perkins
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Harrison Hsiang
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Katharine Tooke
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Carolyn Drescher
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Grant W Hennig
- Department of Pharmacology, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Thomas J Heppner
- Department of Pharmacology, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Mark T Nelson
- Department of Pharmacology, Larner College of Medicine, University of Vermont, Burlington, Vermont
| | - Margaret A Vizzard
- Department of Neurological Sciences, Larner College of Medicine, University of Vermont, Burlington, Vermont
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P2Y 6-deficiency increases micturition frequency and attenuates sustained contractility of the urinary bladder in mice. Sci Rep 2017; 7:771. [PMID: 28396595 PMCID: PMC5429706 DOI: 10.1038/s41598-017-00824-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 03/14/2017] [Indexed: 12/30/2022] Open
Abstract
The role of the P2Y6 receptor in bladder function has recently attracted a great deal of attention in lower urinary tract research. We conducted this study to determine contributions of the P2Y6 receptor in lower urinary tract function of normal phenotypes by comparing P2Y6-deficient mice and wild-type mice. In in vivo experiments, P2Y6-deficient mice had more frequent micturition with smaller bladder capacity compared to wild-type mice; however, there was no difference between these groups in bladder-filling pressure/volume relationships during cystometry under decerebrate, unanaesthetized conditions. Analysis of in vivo bladder contraction revealed significant difference between the 2 groups, with P2Y6-deficient mice presenting markedly shorter bladder contraction duration but no difference in peak contraction pressure. However, analysis of in vitro experiments showed no P2Y6 involvements in contraction and relaxation of bladder muscle strips and in ATP release by mechanical stimulation of primary-cultured urothelial cells. These results suggest that the P2Y6 receptor in the central nervous system, dorsal root ganglion, or both is involved in inhibition of bladder afferent signalling or sensitivity in the pontine micturition centre and that the receptor in the detrusor may be implicated in facilitation to sustain bladder contraction force.
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Traini C, Del Popolo G, Lazzeri M, Mazzaferro K, Nelli F, Calosi L, Vannucchi MG. γEpithelial Na(+) Channel (γENaC) and the Acid-Sensing Ion Channel 1 (ASIC1) expression in the urothelium of patients with neurogenic detrusor overactivity. BJU Int 2015; 116:797-804. [PMID: 25109632 DOI: 10.1111/bju.12896] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
OBJECTIVE To investigate the expression of two types of cation channels, γEpithelial Na(+) Channel (γENaC) and the Acid-Sensing Ion Channel 1 (ASIC1), in the urothelium of controls and in patients affected by neurogenic detrusor overactivity (NDO). In parallel, urodynamic parameters were collected and correlated to the immunohistochemical results. PATIENTS SUBJECTS AND METHODS Four controls and 12 patients with a clinical diagnosis of NDO and suprasacral spinal cord lesion underwent urodynamic measurements and cystoscopy. Cold-cup biopsies were frozen and processed for immunohistochemistry and Western Blot. Spearman's correlation coefficient between morphological and urodynamic data was applied. One-way anova followed by Newman-Keuls multiple comparison post hoc test was applied for Western Blot results. RESULTS In the controls, γENaC and ASIC1 were expressed in the urothelium with differences in their cell distribution and intensity. In patients with NDO, both markers showed consistent changes either in cell distribution and labelling intensity compared with the controls. A significant correlation between a higher intensity of γENaC expression in the urothelium of patients with NDO and lower values of bladder compliance was detected. CONCLUSIONS The present findings show important changes in the expression of γENaC and ASIC1 in NDO human urothelium. Notably, while the changes in γENaC might impair the mechanosensory function of the urothelium, the increase of ASIC1 might represent an attempt to compensate for the excess in local sensitivity.
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Affiliation(s)
- Chiara Traini
- Department of Experimental and Clinical Medicine, Histology and Embryology Research Unit, University of Florence, Florence, Italy
| | - Giulio Del Popolo
- Department of Neuro-Urology, Careggi University Hospital, Florence, Italy
| | - Massimo Lazzeri
- Division of Oncology, Unit of Urology, URI, IRCCS Ospedale San Raffaele, Università Vita-Salute San Raffaele, Milan, Italy
| | - Katia Mazzaferro
- Department of Experimental and Clinical Medicine, Histology and Embryology Research Unit, University of Florence, Florence, Italy
| | - Federico Nelli
- Department of Neuro-Urology, Careggi University Hospital, Florence, Italy
| | - Laura Calosi
- Department of Experimental and Clinical Medicine, Histology and Embryology Research Unit, University of Florence, Florence, Italy
| | - Maria Giuliana Vannucchi
- Department of Experimental and Clinical Medicine, Histology and Embryology Research Unit, University of Florence, Florence, Italy
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Increased TRPV4 expression in urinary bladder and lumbosacral dorsal root ganglia in mice with chronic overexpression of NGF in urothelium. J Mol Neurosci 2013; 51:602-14. [PMID: 23690258 DOI: 10.1007/s12031-013-0033-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 05/09/2013] [Indexed: 12/19/2022]
Abstract
Transient receptor potential vanilloid (TRPV) family member 4 (TRPV4) expression has been demonstrated in urothelial cells and dorsal root ganglion (DRG) neurons, and roles in normal micturition reflexes as well as micturition dysfunction have been suggested. TRP channel expression and function is dependent upon target tissue expression of growth factors. These studies expand upon the target tissue dependence of TRPV4 expression in the urinary bladder and lumbosacral DRG using a recently characterized transgenic mouse model with chronic overexpression of nerve growth factor (NGF-OE) in the urothelium. Immunohistochemistry with image analyses, real-time quantitative polymerase chain reaction, and Western blotting were used to determine TRPV4 protein and transcript expression in the urinary bladder (urothelium + suburothelium, detrusor) and lumbosacral DRG from littermate wild-type (WT) and NGF-OE mice. Antibody specificity controls were performed in TRPV4(-/-) mice. TRPV4 transcript and protein expression was significantly (p ≤ 0.001) increased in the urothelium + suburothelium and suburothelial nerve plexus of the urinary bladder and in small- and medium-sized lumbosacral (L1, L2, L6-S1) DRG cells from NGF-OE mice compared to littermate WT mice. NGF-OE mice exhibit significant (p ≤ 0.001) increases in NGF transcript and protein in the urothelium + suburothelium and lumbosacral DRG. These studies demonstrate regulation of TRPV4 expression by NGF in lower urinary tract tissues. Ongoing studies are characterizing the functional roles of TRPV4 expression in the sensory limb (DRG, urothelium) of the micturition reflex.
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Abstract
The members of transient receptor potential (TRP) superfamily of cationic ion channels represent universal sensors, which convert multiple exogenous and endogenous chemical and physical stimuli into electrical and functional cellular responses. TRPs are widely distributed in many different tissues, and expression of numerous TRP types has been reported in lower urinary tract (LUT) tissues, neuronal fibers innervating the bladder and urethra, and epithelial and muscular layers of the bladder and urethral walls, where they are mainly involved in nociception and mechanosensory transduction. As such, they represent attractive targets for treating LUT disorders. Although information on the functional significance of many of the TRP proteins in the LUT remains very limited, compelling evidence has accumulated for a pivotal role of TRPV1, TRPV2, TRPV4, TRPM8, and TRPA1 in normal and pathological LUT function, mainly as sensors of stretch and chemical irritation. Further studies into these and other TRPs in the LUT will facilitate the development of improved therapeutic strategies to target these channels in LUT disorders.
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Hidayat Santoso AG, Liang W. Bladder contractility is mediated by different K+ channels in the urothelium and detrusor smooth muscle. J Pharmacol Sci 2011; 115:127-134. [PMID: 21258177 DOI: 10.1254/jphs.10162fp] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 11/03/2010] [Indexed: 10/18/2022] Open
Abstract
The roles played by K(+) channels in the urothelium (UE) and detrusor smooth muscle (DSM) in regulating agonist-induced bladder contraction is not known at present. Thus, the effects in carbachol (CCh)-induced contraction in UE-intact (+UE) and UE-denuded (-UE) rat detrusor strips pretreated with K(+)-channel blockers were investigated here. The K(+)-channel blockers used were 4-aminopyridine (4-AP), glibenclamide (Glib), iberiotoxin (IbTx), charybdotoxin (ChTx), and apamin. In the absence of K(+)-channel blockers, control CCh-induced contractions were more potent in -UE than +UE strips. Treatment with IbTx and apamin resulted in more potent CCh-induced contractions in +UE strips. In -UE strips, CCh potency was increased by ChTx and Glib, but decreased by 4-AP. Different K(+) channels in the UE and DSM were thus involved in regulating bladder contractions. Contractile mediatory function of these channels, specific to the UE or DSM, may be potential drug targets in the management of bladder disorders.
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