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Sattayachiti S, Waemong A, Cheaha D, Konthapakdee N. 5-HT3 receptors modulate changes in voiding pattern and bladder contractility in water avoidance stress-induced bladder overactivity in male mice. Auton Neurosci 2022; 243:103040. [DOI: 10.1016/j.autneu.2022.103040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 08/31/2022] [Accepted: 09/27/2022] [Indexed: 11/05/2022]
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Activation of 5-HT3 receptors in the medulla oblongata is involved in the phasic control of urinary bladder. Neurosci Lett 2022; 790:136886. [PMID: 36179901 DOI: 10.1016/j.neulet.2022.136886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/13/2022] [Accepted: 09/20/2022] [Indexed: 11/21/2022]
Abstract
The control of micturition depends on reflex mechanisms, however, it undergoes modulation from cortex, pons and medullary areas. This study investigated if the activation of 5-HT3 receptors in the medulla influences the urinary bladder (UB) regulation in rats. Isoflurane female Wistar rats were submitted to catheterization of the femoral artery and vein for mean arterial pressure (MAP) and heart rate (HR) recordings and injection of drugs, respectively. The UB was cannulated for intravesical pressure (IP) measurement. The Doppler flow probe was placed around the left renal artery for renal conductance (RC) recordings. Phenylbiguanide (PB) and granisetron (GN) were injected into the 4th brain ventricle in rats with guide cannulas implanted 5 days prior to the experiments; or PB and GN were randomly injected intravenously or applied topically (in situ) on the UB. PB injection into 4th V significantly increased IP (68.67 ± 11.70%) and decreased MAP (-29 ± 6 mmHg) compared to saline (0.34 ± 0.64% and -2 ± 2 mmHg), with no changes in the HR and RC. GN injection into the 4th V did not significantly change the IP and RC compared to saline, nevertheless, significantly increased MAP (25 ± 4 mmHg) and heart rate (36 ± 9 bpm) compared to saline. Intravenous PB and GN only produced cardiovascular effects, whilst PB but not GN in situ on the UB evoked increase in IP (111.60 ± 30.36%). Therefore, the activation of 5HT-3 receptors in medullary areas increases the intravesical pressure and these receptors are involved in the phasic control of UB. In contrast, 5-HT3 receptors in the medulla oblongata are involved in the pathways of the tonic control of the cardiovascular system. The activation of 5-HT3 receptors in the bladder cause increase in intravesical pressure and this regulation seem to be under phasic control as the blockade of such receptors elicits no changes in baseline intravesical pressure.
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West EG, Sellers DJ, Chess-Williams R, McDermott C. The anxiolytic sertraline reduces the impact of psychological stress on bladder function in mice. Life Sci 2021; 278:119598. [PMID: 33984361 DOI: 10.1016/j.lfs.2021.119598] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/30/2021] [Accepted: 05/03/2021] [Indexed: 02/05/2023]
Abstract
AIMS To determine if treatment with the selective serotonin reuptake inhibitor (SSRI) sertraline reduces the bladder dysfunction caused by water avoidance stress in mice. MAIN METHODS Adult female mice were randomly allocated to (1) Unstressed, (2) Stressed or (3) Stress + Sertraline experimental groups. Stressed mice were subjected to water avoidance for 1 h/day for 10 days and received sertraline or vehicle in drinking water, starting 10-days prior to the first stress exposure. Age matched control/unstressed mice were house under normal conditions without stress exposure. Voiding behaviour was assessed throughout the experimental protocol. After the final stress exposure, a blood sample was taken to measure plasma corticosterone levels and bladders were removed, catheterised and intravesical pressure responses recorded during distension and in response to pharmacological agents. KEY FINDINGS Plasma corticosterone levels in sertraline-treated animals were equivalent to unstressed controls and significantly decreased compared to the stressed group. Voiding frequency was significantly increased in the stressed group, and treatment with sertraline significantly decreased voiding frequency, however, this remained elevated compared to unstressed control animals. Bladders from stressed mice displayed enhanced maximal contractile response to the muscarinic agonist carbachol and greater release of ACh in the serosal fluid, which was reduced to control levels by sertraline treatment. Spontaneous phasic contractions were not altered by stress but were significantly reduced in bladders from sertraline treated animals, relative to controls. SIGNIFICANCE These results indicate that management of voiding dysfunction caused by psychological stress may be aided by the addition of an SSRI such as sertraline.
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Affiliation(s)
- Eliza G West
- Centre for Urology Research, Faculty of Health Sciences and Medicine, Bond University, Robina, QLD 4229, Australia
| | - Donna J Sellers
- Centre for Urology Research, Faculty of Health Sciences and Medicine, Bond University, Robina, QLD 4229, Australia
| | - Russ Chess-Williams
- Centre for Urology Research, Faculty of Health Sciences and Medicine, Bond University, Robina, QLD 4229, Australia
| | - Catherine McDermott
- Centre for Urology Research, Faculty of Health Sciences and Medicine, Bond University, Robina, QLD 4229, Australia.
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Konthapakdee N, Grundy L, O'Donnell T, Garcia‐Caraballo S, Brierley SM, Grundy D, Daly DM. Serotonin exerts a direct modulatory role on bladder afferent firing in mice. J Physiol 2019; 597:5247-5264. [DOI: 10.1113/jp278751] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 09/03/2019] [Indexed: 12/30/2022] Open
Affiliation(s)
- N. Konthapakdee
- Department of PhysiologyFaculty of SciencePrince of Songkla University Hat Yai Songkhla 90112 Thailand
| | - L. Grundy
- Visceral Pain Research GroupCentre for NeuroscienceCollege of Medicine and Public HealthFlinders University Bedford Park South Australia 5042 Australia
- Hopwood Centre for NeurobiologyLifelong Health ThemeSouth Australian Health and Medical Research Institute (SAHMRI) North Terrace Adelaide South Australia 5000 Australia
- Centre for Nutrition and Gastrointestinal DiseasesDiscipline of MedicineUniversity of Adelaide North Terrace Adelaide South Australia 5000 Australia
| | - T. O'Donnell
- Visceral Pain Research GroupCentre for NeuroscienceCollege of Medicine and Public HealthFlinders University Bedford Park South Australia 5042 Australia
- Hopwood Centre for NeurobiologyLifelong Health ThemeSouth Australian Health and Medical Research Institute (SAHMRI) North Terrace Adelaide South Australia 5000 Australia
- Centre for Nutrition and Gastrointestinal DiseasesDiscipline of MedicineUniversity of Adelaide North Terrace Adelaide South Australia 5000 Australia
| | - S. Garcia‐Caraballo
- Visceral Pain Research GroupCentre for NeuroscienceCollege of Medicine and Public HealthFlinders University Bedford Park South Australia 5042 Australia
- Hopwood Centre for NeurobiologyLifelong Health ThemeSouth Australian Health and Medical Research Institute (SAHMRI) North Terrace Adelaide South Australia 5000 Australia
- Centre for Nutrition and Gastrointestinal DiseasesDiscipline of MedicineUniversity of Adelaide North Terrace Adelaide South Australia 5000 Australia
| | - S. M. Brierley
- Visceral Pain Research GroupCentre for NeuroscienceCollege of Medicine and Public HealthFlinders University Bedford Park South Australia 5042 Australia
- Hopwood Centre for NeurobiologyLifelong Health ThemeSouth Australian Health and Medical Research Institute (SAHMRI) North Terrace Adelaide South Australia 5000 Australia
- Centre for Nutrition and Gastrointestinal DiseasesDiscipline of MedicineUniversity of Adelaide North Terrace Adelaide South Australia 5000 Australia
| | - D. Grundy
- Department of Biomedical ScienceUniversity of Sheffield Sheffield UK
| | - D. M. Daly
- University of Central Lancashire Preston UK
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Bilge SS, Akyuz B, Arslan DG, Balci H, Darakci O, Bozkurt A. Venlafaxine Inhibits Detrusor Contractions in Rats: A Role for Extracellular Calcium. INT J PHARMACOL 2017. [DOI: 10.3923/ijp.2017.612.619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Stimulation of contractions in pregnant human myometrium is associated with 5-HT3 receptors. Int J Obstet Anesth 2016; 28:28-33. [PMID: 27720614 DOI: 10.1016/j.ijoa.2016.09.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 09/01/2016] [Accepted: 09/02/2016] [Indexed: 12/18/2022]
Abstract
BACKGROUND Serotonin (5-HT) is known to play an important role in regulating uterine contractions. However, the specific receptors involved have not been well characterized. We evaluated whether 5-HT3 receptors exist in human myometrium, and their effects on myometrial contractility when stimulated by a 5-HT3 agonist. METHODS Four tissue samples taken from patients undergoing hysterectomy (n=2) and elective cesarean delivery (n=2) were used to detect expression of 5-HT3 receptors on the myometrium using western blotting. For isometric tension measurement, another 12 myometrial strips obtained from patients undergoing elective cesarean delivery were randomly divided into a control group (Group CON) and an RS56812 group (Group RG). In increasing doses from 10-7M to 10-4M, RS56812, a 5-HT3 receptor agonist, was used to investigate the contractile effects after bonding to the 5-HT3 receptor, following which the effects of granisetron were assessed. Amplitude, interval and duration of myometrial contractions were recorded. RESULTS Proteins with a molecular mass of 55kDa, consistent with 5-HT3 receptors, were detected both on non-pregnant and late-pregnant human uteri. RS56812 increased the contractile amplitude at concentrations of 10-6M, 10-5M and 10-4M, achieving maximum effect at 10-5M. A prolonged contractile interval was detected at the concentration of 10-4M. However, RS56812 showed no significant effect on contraction duration. Granisetron did not reverse the contractile effects induced by RS56812. CONCLUSION 5-HT3 receptors are expressed on non-pregnant and pregnant uteri. RS56812 enhanced myometrial contractions, but this was not affected by granisetron, the mechanism of which requires further investigation.
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Matsumoto-Miyai K, Yamada E, Shinzawa E, Koyama Y, Shimada S, Yoshizumi M, Kawatani M. Serotonergic regulation of distention-induced ATP release from the urothelium. Am J Physiol Renal Physiol 2015; 310:F646-F655. [PMID: 26582760 DOI: 10.1152/ajprenal.00024.2015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 11/09/2015] [Indexed: 12/14/2022] Open
Abstract
Serotonin [5-hydroxytryptamine (5-HT)] is involved in both motor and sensory functions in hollow organs, especially in the gastrointestinal tract. However, the involvement of 5-HT in visceral sensation of the urinary bladder remains unknown. Because distention-induced ATP release from the urothelium plays an essential role in visceral sensation of the urinary bladder, we investigated the regulation of urothelial ATP release by the 5-HT signaling system. RT-PCR and immunohistochemical analyses of the urothelium revealed specific expression of 5-HT1D and 5-HT4 receptors. The addition of 5-HT did not affect urothelial ATP release without bladder distention, but it significantly reduced distention-induced ATP release by physiological pressure during urine storage (5 cmH2O). The inhibitory effect of 5-HT on distention-elicited ATP release was blocked by preincubation with the 5-HT1B/1D antagonist GR-127935 but not by the 5-HT4 antagonist SB-204070. mRNA encoding tryptophan hydroxylase 1 was detected in the urinary bladder by nested RT-PCR amplification, and l-tryptophan or the selective serotonin reuptake inhibitor citalopram also inhibited ATP release, indicating that 5-HT is endogenously synthesized and released in the urinary bladder. The addition of GR-127935 significantly enhanced the distention-elicited ATP release 40 min after distention, whereas SB-204070 reduced the amount of ATP release 20 min after distention. These data suggest that 5-HT4 facilitates the distention-induced ATP release at an earlier stage, whereas 5-HT1D inhibits ATP release at a later stage. The net inhibitory effect of 5-HT indicates that the action of 5-HT on the urothelium is mediated predominantly by 5-HT1D.
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Affiliation(s)
- Kazumasa Matsumoto-Miyai
- Department of Neurophysiology, Akita University Graduate School of Medicine, Akita, Japan; .,Kansai University of Nursing and Health Sciences, Hyogo, Japan; and.,Department of Neuroscience and Cell Biology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Erika Yamada
- Department of Neurophysiology, Akita University Graduate School of Medicine, Akita, Japan
| | - Eriko Shinzawa
- Department of Neurophysiology, Akita University Graduate School of Medicine, Akita, Japan
| | - Yoshihisa Koyama
- Department of Neuroscience and Cell Biology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Shoichi Shimada
- Department of Neuroscience and Cell Biology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masaru Yoshizumi
- Department of Neurophysiology, Akita University Graduate School of Medicine, Akita, Japan
| | - Masahito Kawatani
- Department of Neurophysiology, Akita University Graduate School of Medicine, Akita, Japan
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Matsumoto-Miyai K, Yoshizumi M, Kawatani M. Regulatory Effects of 5-Hydroxytryptamine Receptors on Voiding Function. Adv Ther 2015; 32 Suppl 1:3-15. [PMID: 26391372 DOI: 10.1007/s12325-015-0240-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Indexed: 10/23/2022]
Abstract
UNLABELLED A growing body of evidence suggests that 5-hydroxytryptamine (5-HT; serotonin) has both physiological and pathological functions in the lower urinary tract. A wide variety of 5-HT receptor subtypes are variably expressed in different organs, both peripheral and central. On urinary bladder smooth muscle, 5-HT1A, 5-HT2, 5-HT3, and 5-HT7 subtypes could function as postjunctional receptors. Postjunctional 5-HT2 receptors induce detrusor contraction of the bladder body. 5-HT1A is suggested to have a similar effect to 5-HT2, while 5-HT3 might suppress detrusor contraction evoked by direct muscle stimulation. Postjunctional 5-HT7 is reported to induce relaxation of the bladder neck, which might be required for efficient voiding. 5-HT1A, 5-HT2A, 5-HT2C, 5-HT3, 5-HT4, and 5-HT7 subtypes also could act as prejunctional receptors in autonomic excitatory nerve terminals. 5-HT2A, 5-HT2C, 5-HT3, 5-HT4, and 5-HT7 subtypes facilitate the neurogenic contraction of the detrusor by enhancing cholinergic or purinergic transmission, whereas 5-HT1A receptors might inhibit the release of acetylcholine in the detrusor. Furthermore, 5-HT1D could be involved in the suppression of ATP release from the urothelium, aiding visceral sensation of the urinary bladder. In the central pathways controlling the micturition reflex, 5-HT1A, 5-HT2A, and 5-HT7 are involved in regulation of bladder and urethral sphincter activities. Their functions, especially that of 5-HT1A, vary in a species- and site (spinal or supraspinal)- dependent manner. In addition to urinary bladder, 5-HT could be involved in prostate contraction and cell proliferation. Evidence indicates that 5-HT receptor subtypes may be novel therapeutic targets for lower urinary tract symptoms. FUNDING Grants-in-Aid for Scientific Research (C) (KAKENHI 23590707, 24590722, and 26460694) from the Japan Society for the Promotion of Science.
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Michel MC. Therapeutic modulation of urinary bladder function: multiple targets at multiple levels. Annu Rev Pharmacol Toxicol 2014; 55:269-87. [PMID: 25251997 DOI: 10.1146/annurev-pharmtox-010814-124536] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Storage dysfunction of the urinary bladder, specifically overactive bladder syndrome, is a condition that occurs frequently in the general population. Historically, pathophysiological and treatment concepts related to overactive bladder have focused on smooth muscle cells. Although these are the central effector, numerous anatomic structures are involved in their regulation, including the urothelium, afferent and efferent nerves, and the central nervous system. Each of these structures involves receptors for—and the urothelium itself also releases—many mediators. Moreover, hypoperfusion, hypertrophy, and fibrosis can affect bladder function. Established treatments such as muscarinic antagonists, β-adrenoceptor agonists, and onabotulinumtoxinA each work in part through their effects on the urothelium and afferent nerves, as do α1-adrenoceptor antagonists in the treatment of voiding dysfunction associated with benign prostatic hyperplasia; however, none of these treatments are specifically targeted to the urothelium and afferent nerves. It remains to be explored whether future treatments that specifically act at one of these structures will provide a therapeutic advantage.
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Affiliation(s)
- Martin C Michel
- Department of Pharmacology, Johannes Gutenberg University, 55101 Mainz, Germany;
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Newman AS, Batis N, Grafton G, Caputo F, Brady CA, Lambert JJ, Peters JA, Gordon J, Brain KL, Powell AD, Barnes NM. 5-Chloroindole: a potent allosteric modulator of the 5-HT₃ receptor. Br J Pharmacol 2014; 169:1228-38. [PMID: 23594147 DOI: 10.1111/bph.12213] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 01/08/2013] [Accepted: 02/16/2013] [Indexed: 12/01/2022] Open
Abstract
BACKGROUND AND PURPOSE The 5-HT₃ receptor is a ligand-gated ion channel that is modulated allosterically by various compounds including colchicine, alcohols and volatile anaesthetics. However the positive allosteric modulators (PAMs) identified to date have low affinity, which hinders investigation because of non-selective effects at pharmacologically active concentrations. The present study identifies 5-chloroindole (Cl-indole) as a potent PAM of the 5-HT₃ receptor. EXPERIMENTAL APPROACH 5-HT₃ receptor function was assessed by the increase in intracellular calcium and single-cell electrophysiological recordings in HEK293 cells stably expressing the h5-HT₃A receptor and also the mouse native 5-HT₃ receptor that increases neuronal contraction of bladder smooth muscle. KEY RESULTS Cl-indole (1-100 μM) potentiated agonist (5-HT) and particularly partial agonist [(S)-zacopride, DDP733, RR210, quipazine, dopamine, 2-methyl-5-HT, SR57227A, meta chlorophenyl biguanide] induced h5-HT₃A receptor-mediated responses. This effect of Cl-indole was also apparent at the mouse native 5-HT₃ receptor. Radioligand-binding studies identified that Cl-indole induced a small (≈ twofold) increase in the apparent affinity of 5-HT for the h5-HT₃A receptor, whereas there was no effect upon the affinity of the antagonist, tropisetron. Cl-indole was able to reactivate desensitized 5-HT₃ receptors. In contrast to its effect on the 5-HT₃ receptor, Cl-indole did not alter human nicotinic α7 receptor responses. CONCLUSIONS AND IMPLICATIONS The present study identifies Cl-indole as a relatively potent and selective PAM of the 5-HT₃ receptor; such compounds will aid investigation of the molecular basis for allosteric modulation of the 5-HT₃ receptor and may assist the discovery of novel therapeutic drugs targeting this receptor.
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Affiliation(s)
- Amy S Newman
- Cellular and Molecular Neuropharmacology Research Group, Clinical and Experimental Medicine, Medical School, University of Birmingham, Edgbaston, Birmingham, UK
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Javid FA, Palea S. The effect of 5-HT and electrical field stimulation on the contractility of the whole isolated urinary bladder of Suncus murinus. Eur J Pharmacol 2013; 723:489-93. [PMID: 24513135 DOI: 10.1016/j.ejphar.2013.10.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 10/14/2013] [Accepted: 10/17/2013] [Indexed: 11/28/2022]
Abstract
The present study used the whole isolated urinary bladder of Suncus murinus, to investigate the effect of exogenously added serotonin (5-HT) and electrical field stimulation (EFS) in the absence and presence of methysergide, a 5-HT1/2/7 receptor antagonist or the selective 5-HT7 receptor antagonist, SB269970. Further experiments investigated the involvement of potassium channel, cholinergic and purinergic systems in mediating the contractile response to EFS. Pre-treatment with methysergide reduced and increased the contractile responses to 5-HT and EFS, respectively. Pre-treatment with SB269970 increased the responses to 5-HT without modifying the EFS-induced contractions. EFS-induced contractions were not modified by pre-treatment with atropine (10μM), α-β-methylene ATP or glibenclamide. EFS-induced contractions were attenuated by cromakalim (10µM) or atropine (0.1 µM). In conclusion, the 5-HT2 receptors are likely to play a role in mediating the contractile response to 5-HT in detrusor muscle. Furthermore, EFS-induced contractions are mediated through cholinergic and an unknown neurotransmitter which is modulated by K(ATP) channels in the detrusor muscle of Suncus murinus.
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Affiliation(s)
- Farideh A Javid
- Division of Pharmacy and Pharmaceutical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield, Queensgates, HD1 3DH, UK.
| | - Stefano Palea
- UROsphere S.A.S., Faculté des Sciences Pharmaceutiques, 35 Chemin des Maraichers, 31062 Toulouse Cedex 09, France.
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Sakai T, Kasahara KI, Tomita KI, Ikegaki I, Kuriyama H. 5-Hydroxytryptamine-induced bladder hyperactivity via the 5-HT2A receptor in partial bladder outlet obstruction in rats. Am J Physiol Renal Physiol 2013; 304:F1020-7. [PMID: 23344575 DOI: 10.1152/ajprenal.00365.2012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We investigated the effects of partial bladder outlet obstruction (BOO) on the function and gene expression of 5-hydroxytryptamine (5-HT) receptor subtypes in rat bladder. Isometric contractions of the isolated bladders from sham-operated control and BOO rats were examined. The contractile responses to 5-HT were significantly increased in BOO rat bladder strips, while the responses to KCl, carbachol, or phenylephrine were not different from the control. The 5-HT-induced hypercontraction in BOO rat bladder strips was inhibited by ketanserin, a 5-HT(2A) receptor antagonist. The contractile responses to 5-HT in bladder strips were not affected by urothelium removal from the intact bladder. The gene expression of 5-HT receptor subtypes in the bladders was analyzed by RT-PCR. The mRNA expression of the 5-HT(2A), 5-HT(2B), 5-HT(2C), 5-HT(4), and 5-HT(7) receptors was detected in both the control and BOO rat bladders. Quantitative RT-PCR analysis showed there was a significant increase of 5-HT(2A) receptor mRNA in the BOO rat bladder compared with the control bladder. On the other hand, the gene expression of the 5-HT(4) receptor was not changed in the BOO rat bladder. These results suggest that the increased contractile responses to 5-HT in BOO rat bladder may be partly caused by 5-HT(2A) receptor upregulation in the detrusor smooth muscles.
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Affiliation(s)
- Takumi Sakai
- Laboratory for Development Pharmacology, Pharmaceuticals Research Center, Asahi Kasei Pharma Corporation, Izunokuni-shi, Shizuoka, Japan
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Lychkova AE, Pavone LM. Role of serotonin receptors in regulation of contractile activity of urinary bladder in rabbits. Urology 2013; 81:696.e13-8. [PMID: 23290148 DOI: 10.1016/j.urology.2012.11.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 10/30/2012] [Accepted: 11/19/2012] [Indexed: 01/13/2023]
Abstract
OBJECTIVE To evaluate the role of different serotonin (5-hydroxytryptamine [5-HT]) receptor subtypes on urinary bladder contraction, pharmacologic analysis of electromotor activity (EMA) variation was performed using a rabbit bladder model. MATERIALS AND METHODS Measurements of EMA were performed on 3 urinary bladder portions: top, body, and trigone. The experiments were performed on 24 Shinshilla rabbits of both sexes, 5-6 months old, and weighing 2.5-4.0 kg. The bladder was isolated. Noninvasive electrodes were superimposed on the surface of the top, body, and trigone of the bladder. Contact between the electrode tips and the bladder surface was achieved. The bladder EMA was measured using bipolar silver electrodes for extracellular recordings. RESULTS The stimulation of the serotoninergic fibers and parasympathetic nerve resulted in increased bladder EMA frequency and amplitude (72% and 25%, respectively). The increase in bladder EMA was prevented by administration of selective inhibitors of serotonin receptor subtypes such as droperidol, spiperone, and sumatriptan. Exogenous serotonin administered to the rabbits after vagus nerve excitation increased the typical EMA of the bladder body smooth muscle. CONCLUSION The serotoninergic system has been widely implicated in the control of urinary bladder function. In the present study, we have demonstrated that preganglionic fibers and ganglionic serotoninergic neurons, expressing the 5-HT3 and 5-HT4 receptors, and the effector smooth muscle cells, expressing 5-HT1 and 5-HT2 receptors, are actively involved in the regulation of the bladder contractile activity in rabbits.
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Affiliation(s)
- Alla E Lychkova
- Central Research Institute of Gastroenterology, Moscow, Russia
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5-Hydroxytryptamine potentiates neurogenic contractions of rat isolated urinary bladder through both 5-HT7 and 5-HT2C receptors. Eur J Pharmacol 2011; 650:403-10. [DOI: 10.1016/j.ejphar.2010.10.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 10/05/2010] [Accepted: 10/06/2010] [Indexed: 11/21/2022]
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Michel MC, Barendrecht MM. Physiological and pathological regulation of the autonomic control of urinary bladder contractility. Pharmacol Ther 2008; 117:297-312. [DOI: 10.1016/j.pharmthera.2007.12.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 12/04/2007] [Indexed: 01/10/2023]
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Signal transduction underlying the control of urinary bladder smooth muscle tone by muscarinic receptors and beta-adrenoceptors. Naunyn Schmiedebergs Arch Pharmacol 2007; 377:449-62. [PMID: 18060543 PMCID: PMC2480512 DOI: 10.1007/s00210-007-0208-0] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2007] [Accepted: 10/21/2007] [Indexed: 12/17/2022]
Abstract
The normal physiological contraction of the urinary bladder, which is required for voiding, is predominantly mediated by muscarinic receptors, primarily the M3 subtype, with the M2 subtype providing a secondary backup role. Bladder relaxation, which is required for urine storage, is mediated by β-adrenoceptors, in most species involving a strong β3-component. An excessive stimulation of contraction or a reduced relaxation of the detrusor smooth muscle during the storage phase of the micturition cycle may contribute to bladder dysfunction known as the overactive bladder. Therefore, interference with the signal transduction of these receptors may be a viable approach to develop drugs for the treatment of overactive bladder. The prototypical signaling pathway of M3 receptors is activation of phospholipase C (PLC), and this pathway is also activated in the bladder. Nevertheless, PLC apparently contributes only in a very minor way to bladder contraction. Rather, muscarinic-receptor-mediated bladder contraction involves voltage-operated Ca2+ channels and Rho kinase. The prototypical signaling pathway of β-adrenoceptors is an activation of adenylyl cyclase with the subsequent formation of cAMP. Nevertheless, cAMP apparently contributes in a minor way only to β-adrenoceptor-mediated bladder relaxation. BKCa channels may play a greater role in β-adrenoceptor-mediated bladder relaxation. We conclude that apart from muscarinic receptor antagonists and β-adrenoceptor agonists, inhibitors of Rho kinase and activators of BKCa channels may have potential to treat an overactive bladder.
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