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Yamada S, Niiya R, Ito Y, Kato Y, Onoue S. Comparative characterization of β-adrenoceptors in the bladder, heart, and lungs of rats: Alterations in spontaneously hypertensive rats. J Pharmacol Sci 2022; 148:51-55. [PMID: 34924129 DOI: 10.1016/j.jphs.2021.10.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 09/29/2021] [Accepted: 10/05/2021] [Indexed: 10/20/2022] Open
Abstract
The present study aimed to characterize and compare β-adrenoceptors in the rat bladder with those in the heart and lungs of SD rats (8-10 weeks old) using subtype-selective agonists and antagonists in a radioligand binding assay with (-)-[125I]cyanopindolol ([125I]CYP), and also to clarify alterations in β-adrenoceptors in the bladder of spontaneously hypertensive rats (SHR) at 14 weeks old, from those of Wistar-Kyoto rats (WKY) and Wistar rats at the same age. A radioligand binding assay with [125I]CYP was used to measure β-adrenoceptor binding activity in rat tissues. Metoprolol exhibited the highest affinity to specific binding sites of [125I]CYP in the rat heart, indicating the dominance of β1-adrenoceptors. β3-selective agonists (BRL37344 and CL316243) and antagonist (SR59230A) exhibited higher affinity to specific binding sites of [125I]CYP in the bladder than in the heart and lungs. Furthermore, the binding affinity of the β2-selective antagonist, ICI118551 was the highest in the bladder. The Bmax of specific [125]CYP binding in the bladder was significantly lower in WKY and SHR than in Wistar rats. The present study provides further evidence for the coexistence of β2-and β3-adrenoceptors in the rat bladder, and indicates that β-adrenoceptor density is lower in the bladders of WKY and SHR.
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MESH Headings
- Animals
- Lung/metabolism
- Myocardium/metabolism
- Radioligand Assay/methods
- Rats, Inbred SHR/metabolism
- Rats, Inbred WKY
- Rats, Sprague-Dawley
- Rats, Wistar
- Receptors, Adrenergic, beta/metabolism
- Receptors, Adrenergic, beta-1/metabolism
- Receptors, Adrenergic, beta-3/metabolism
- Urinary Bladder/metabolism
- Rats
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Affiliation(s)
- Shizuo Yamada
- Center for Pharma-Food Research (CPFR), Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
| | - Ryo Niiya
- Laboratory of Biopharmacy, Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yoshihiko Ito
- Center for Pharma-Food Research (CPFR), Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yoshihisa Kato
- Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki, Kagawa 769-2193, Japan
| | - Satomi Onoue
- Laboratory of Biopharmacy, Graduate School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
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Langdale CL, Degoski D, Milliken PH, Grill WM. Voiding behavior in awake unrestrained untethered spontaneously hypertensive and Wistar control rats. Am J Physiol Renal Physiol 2021; 321:F195-F206. [PMID: 34151591 DOI: 10.1152/ajprenal.00564.2020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The spontaneously hypertensive rat (SHR), a genetic model of high blood pressure, has also been studied as a potential model of overactive bladder. In vivo studies have confirmed the presence of surrogate markers of overactive bladder, including detrusor overactivity, increased urinary frequency, decreased bladder capacity and voided volume (VV), and afferent hypersensitivity to bladder irritation. However, these observations were during awake cystometry using implanted bladder catheters tethered to an infusion pump and artificially filled. We conducted experiments in awake unrestrained untethered age-matched female SHRs and Wistar rats to quantify naïve consumption and voiding behavior and the effect of capsaicin desensitization on consumption and voiding behavior. Food and water consumption, body weight, voiding frequency, and VV were recorded. Rats were placed in metabolism cages for 24 h, up to twice a week, from 17 to 37 wk of age. Compared with Wistar rats, SHRs exhibited decrease in VV and did not exhibit diurnal variation in VV between light and dark periods, suggesting that SHRs may have bladder hypersensitivity. Furthermore, SHRs may also have smaller bladder capacities, as they consumed less water, voided less volume (regardless of light cycle), and had equal urinary frequencies compared with age-matched Wistar rats. We detected no change in SHR voiding behavior following capsaicin desensitization, which was in contrast to a prior awake in vivo cystometry study describing increased VV and micturition interval in SHRs and suggests that C-fiber activity may not contribute to bladder hypersensitivity in SHRs.NEW & NOTEWORTHY We characterized the long-term (20 wk) voiding, defecation, and consumption behavior of age-matched spontaneously hypertensive and Wistar rats without the influence of anesthesia or catheters. Spontaneously hypertensive rats exhibited bladder hypersensitiviy that persisted for the 20-wk duration and was unaffected by capsacin desensitization.
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Affiliation(s)
| | - Danielle Degoski
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | | | - Warren M Grill
- Department of Biomedical Engineering, Duke University, Durham, North Carolina.,Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina.,Department of Neurobiology, Duke University, Durham, North Carolina.,Department of Neurosurgery, Duke University, Durham, North Carolina
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Nagao Y, Shimizu S, Kurabayashi A, Shimizu T, Tsuda M, Higashi Y, Fujieda M, Saito M. Effects of silodosin and tadalafil on bladder dysfunction in spontaneously hypertensive rats: Possible role of bladder blood flow. Int J Urol 2020; 27:258-265. [PMID: 31944397 DOI: 10.1111/iju.14171] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 11/21/2019] [Indexed: 12/13/2022]
Abstract
OBJECTIVES To investigate the effects of an alpha1-adrenoceptor antagonist, silodosin, or a phosphodiesterase type 5 inhibitor, tadalafil, on bladder overactivity in spontaneously hypertensive rats. METHODS Twelve-week-old male spontaneously hypertensive rats were perorally administered silodosin (100 µg/kg), tadalafil (2 or 10 mg/kg) or vehicle once daily for 6 weeks. Wistar rats were used as normotensive controls and were treated with the vehicle. At 18-weeks-old, the effects of silodosin or tadalafil on blood pressure, bladder blood flow, urodynamic parameters (i.e. micturition frequency, urine output, inter-contraction interval, maximum voiding pressure, single voided volume and post-voiding residual urine volume), and bladder tissue levels of malondialdehyde, interleukin-6 and tumor necrosis factor-alpha were measured. RESULTS A significant increase in blood pressure, micturition frequency and bladder tissue levels of malondialdehyde, interleukin-6 and tumor necrosis factor-alpha was noted in spontaneously hypertensive rats. The single voided volume, bladder capacity and bladder blood flow were significantly lower in the spontaneously hypertensive rats than in the Wistar rats. Treatment with silodosin and the higher dose of tadalafil improved the urodynamic parameters, bladder blood flow and bladder tissue levels of malondialdehyde in the spontaneously hypertensive rats without affecting the blood pressure and bladder tissue levels of interleukin-6 and tumor necrosis factor-alpha. CONCLUSIONS Treatment with silodosin or tadalafil might improve hypertension-related bladder overactivity, as shown in spontaneously hypertensive rats through an improvement in the bladder blood flow and bladder tissue levels of oxidative stress.
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Affiliation(s)
- Yoshiki Nagao
- Departments of, Department of, Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan.,Department of, Pediatrics, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Shogo Shimizu
- Departments of, Department of, Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Atsushi Kurabayashi
- Department of, Pathology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Takahiro Shimizu
- Departments of, Department of, Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Masayuki Tsuda
- Institute for Laboratory Animal Research, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Youichirou Higashi
- Departments of, Department of, Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Mikiya Fujieda
- Department of, Pediatrics, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
| | - Motoaki Saito
- Departments of, Department of, Pharmacology, Kochi Medical School, Kochi University, Nankoku, Kochi, Japan
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Abstract
Nonclinical studies form the basis for the decision whether to take a therapeutic candidate into the clinic. These studies need to exhibit translational robustness for both ethical and economic reasons. Key findings confirmed in multiple species have a greater chance to also occur in humans. Given the heterogeneity of patient populations, preclinical studies or at least programs comprising multiple studies need to reflect such heterogeneity, e.g., regarding strains, sex, age, and comorbidities of experimental animals. However, introducing such heterogeneity requires larger studies/programs to maintain statistical power in the face of greater variability. In addition to classic sources of bias, e.g., related to lack of randomization and concealment, translational studies face specific sources of potential bias such as that introduced by a model that may not reflect the full spectrum of underlying pathophysiology in patients, that defined by timing of treatment, or that implied in dosing decisions and interspecies differences in pharmacokinetic profiles. The balance of all these factors needs to be considered carefully for each study and program.
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Shimizu S, Shimizu T, Higashi Y, Saito M. Lower urinary tract symptoms as a vascular dysfunction: the effect of nicorandil as a vasodilator. Nihon Yakurigaku Zasshi 2015; 146:21-6. [PMID: 26165338 DOI: 10.1254/fpj.146.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kim KH, Jung HB, Choi DK, Park GH, Cho ST. Does Methylphenidate Affect Cystometric Parameters in Spontaneously Hypertensive Rats? Int Neurourol J 2015; 19:67-73. [PMID: 26126435 PMCID: PMC4490317 DOI: 10.5213/inj.2015.19.2.67] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Accepted: 05/31/2015] [Indexed: 11/17/2022] Open
Abstract
PURPOSE Methylphenidate (MPH) is one of the most commonly prescribed psychostimulants for attention deficit hyperactivity disorder (ADHD). However, there is limited research on its effects on lower urinary tract function. This study investigated changes in cystometric parameters after intragastric administration of MPH in conscious spontaneously hypertensive rats (SHRs), an animal model of ADHD. METHODS Fourteen- to 16-week-old male SHRs (n=10), weighing between 280 and 315 g, were used. Three micturition cycles were recorded before administering MPH. One hour after each intragastric MPH injection, three cycles of cystometrogram were obtained in the awake condition. Various cystometric parameters were evaluated, including basal pressure (BP), maximal pressure (MP), threshold pressure (TP), bladder capacity (BC), micturition volume (MV), micturition interval (MI), and residual volume (RV). The data were analyzed using paired Student t-tests. RESULTS Five SHRs were each administered a dose of 3-mg/kg MPH, and the other five received a dose of 6-mg/kg MPH. BP and MP increased significantly in the rats that received the 3-mg/kg MPH injection, but not in those that received the 6-mg/kg injection. BC, MV, and MI significantly increased in the rats that received the 6-mg/kg MPH injection, but not in those that received the 3-mg/kg injection. There were no significant changes in TP after either injection. CONCLUSIONS Significant increases in BC, MV, and MI after the 6-mg/kg MPH injection suggest that the peripheral and the central nervous systems may play important roles in bladder function in those receiving MPH for ADHD.
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Affiliation(s)
- Khae Hawn Kim
- Department of Urology, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea
| | - Ha Bum Jung
- Department of Urology, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Don Kyoung Choi
- Department of Urology, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Geun Ho Park
- Department of Pharmacology, Inha University College of Medicine, Incheon, Korea
| | - Sung Tae Cho
- Department of Urology, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
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Lee UJ, Ackerman AL, Wu A, Zhang R, Leung J, Bradesi S, Mayer EA, Rodríguez LV. Chronic psychological stress in high-anxiety rats induces sustained bladder hyperalgesia. Physiol Behav 2014; 139:541-8. [PMID: 25449389 DOI: 10.1016/j.physbeh.2014.11.045] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Accepted: 11/13/2014] [Indexed: 10/24/2022]
Abstract
OBJECTIVE To evaluate whether anxiety-prone rats exposed to chronic water avoidance stress (WAS) develop visceral bladder hyperalgesia in addition to increased voiding frequency and anxiety-related behaviors. MATERIALS AND METHODS Female Wistar-Kyoto (WKY) rats were exposed to chronic (10-day) WAS or sham paradigms. Referred hyperalgesia and tactile allodynia were tested using von Frey filaments applied to the suprapubic region and plantar region of the hindpaw, respectively. To confirm that suprapubic nociception represented referred visceral bladder hyperalgesia, we recorded abdominal visceromotor responses (VMR) to slow (100 μl/min) and fast (1 cc/sec) bladder filling with room temperature or ice-cold saline. We assessed the development of hyperalgesia over the 10-day WAS protocol and the durability of increased pain sensations over time. RESULTS Animals exposed to chronic WAS had significantly lower hindpaw withdrawal thresholds post-stress and significant differences in referred hyperalgesia. Rats exposed to chronic WAS demonstrated an increased pain response to suprapubic stimulation and decreased response threshold to mechanical hindpaw stimulation by day 8 of the stress protocol, which persisted for more than one month. Animals exposed to chronic WAS showed increased VMR to fast filling and ice water testing in comparison to sham animals. Cystometry under anesthesia did not show increases in the frequency of non-voiding contractions. CONCLUSION Chronic WAS induces sustained bladder hyperalgesia, lasting over a month after exposure to stress. The urinary frequency demonstrated previously in anxiety-prone rats exposed to chronic WAS seems to be associated with bladder hyperalgesia, suggesting that this is a potential model for future studies of bladder hypersensitivity syndromes such as interstitial cystitis/painful bladder syndrome (IC/PBS).
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Affiliation(s)
- Una J Lee
- Section of Urology and Renal Transplantation, Virginia Mason, Seattle, WA.
| | - A Lenore Ackerman
- Department of Urology, University of Southern California, Los Angeles, CA
| | - Ais Wu
- Department of Urology, University of Southern California, Los Angeles, CA
| | - Rong Zhang
- Department of Urology, University of Southern California, Los Angeles, CA
| | - Joanne Leung
- Department of Urology, University of Southern California, Los Angeles, CA
| | - Sylvie Bradesi
- Center for the Neurobiology of Stress, The David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Emeran A Mayer
- Center for the Neurobiology of Stress, The David Geffen School of Medicine at UCLA, Los Angeles, CA
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Shimizu S, Tsounapi P, Shimizu T, Honda M, Inoue K, Dimitriadis F, Saito M. Lower urinary tract symptoms, benign prostatic hyperplasia/benign prostatic enlargement and erectile dysfunction: Are these conditions related to vascular dysfunction? Int J Urol 2014; 21:856-64. [DOI: 10.1111/iju.12501] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 04/16/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Shogo Shimizu
- Department of Pharmacology; Kochi Medical School, Kochi University; Nankoku Japan
| | - Panagiota Tsounapi
- Division of Urology; Tottori University School of Medicine; Yonago Japan
| | - Takahiro Shimizu
- Department of Pharmacology; Kochi Medical School, Kochi University; Nankoku Japan
| | - Masashi Honda
- Division of Urology; Tottori University School of Medicine; Yonago Japan
| | - Keiji Inoue
- Department of Urology; Kochi Medical School; Kochi University; Nankoku Japan
| | - Fotios Dimitriadis
- B' Urologic Department; Papageorgiou General Hospital; School of Medicine; Aristotle University; Thessaloniki Greece
| | - Motoaki Saito
- Department of Pharmacology; Kochi Medical School, Kochi University; Nankoku Japan
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The Role of Intra-abdominal Pressure Measurement in Awake Rat Cystometry. Int Neurourol J 2013; 17:44-7. [PMID: 23869267 PMCID: PMC3713241 DOI: 10.5213/inj.2013.17.2.44] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 06/18/2013] [Indexed: 12/01/2022] Open
Abstract
Rat cystometry is increasingly being used in research on overactive bladder and is a research tool for investigating bladder functions during the storage and voiding phases. Measurement of the pressure in the bladder is an essential part of cystometry, although that pressure is the sum of both detrusor and intra-abdominal pressures. In anesthetic cystometry, measurement of the intra-abdominal pressure is not necessary, because the values of this variable are negligible. In awake cystometry, however, it is mandatory to separate the changes in intra-abdominal pressure from those in intravesical pressure, because consciousness causes much variability in intra-abdominal pressure. This review describes why we use the term "detrusor overactivity" in animal research with intra-abdominal pressure and presents evidence for the role of intra-abdominal pressure in the cystometry of normal rats and in animal models of overactive bladder directed at understanding the pathogenesis of the overactive bladder condition. The methodology is also briefly reviewed.
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Shimizu S, Saito M, Oiwa H, Ohmasa F, Tsounapi P, Oikawa R, Dimitriadis F, Martin DT, Satoh I, Kinoshita Y, Tomita S. Olmesartan ameliorates urinary dysfunction in the spontaneously hypertensive rat via recovering bladder blood flow and decreasing oxidative stress. Neurourol Urodyn 2013; 33:350-7. [DOI: 10.1002/nau.22405] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 03/08/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Shogo Shimizu
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Motoaki Saito
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Harunori Oiwa
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Fumiya Ohmasa
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Panagiota Tsounapi
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Ryo Oikawa
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Fotios Dimitriadis
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Darryl T. Martin
- Department of Urology; Yale University School of Medicine; New Haven, Connecticut
| | - Itaru Satoh
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Yukako Kinoshita
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
| | - Shuhei Tomita
- Division of Molecular Pharmacology; Tottori University School of Medicine; Yonago Japan
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Cristofaro V, Yalla SV, Sullivan MP. Altered Caveolar Mediated Purinergic Signaling in Spontaneously Hypertensive Rats with Detrusor Overactivity. J Urol 2012; 188:1017-26. [DOI: 10.1016/j.juro.2012.04.100] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Indexed: 12/27/2022]
Affiliation(s)
- Vivian Cristofaro
- Division of Urology, Veterans Affairs Boston Healthcare System, Harvard Medical School, Boston, Massachusetts
| | - Subbarao V. Yalla
- Division of Urology, Veterans Affairs Boston Healthcare System, Harvard Medical School, Boston, Massachusetts
| | - Maryrose P. Sullivan
- Division of Urology, Veterans Affairs Boston Healthcare System, Harvard Medical School, Boston, Massachusetts
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Saito M, Shimizu S, Ohmasa F, Oikawa R, Tsounapi P, Dimitriadis F, Kinoshita Y, Satoh K. Characterization of silodosin and naftopidil in the treatment of bladder dysfunction in the spontaneously hypertensive rat. Neurourol Urodyn 2012; 32:393-8. [DOI: 10.1002/nau.22297] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 07/10/2012] [Indexed: 11/06/2022]
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Hydroxyfasudil Ameliorates Bladder Dysfunction in Male Spontaneously Hypertensive Rats. Urology 2012; 79:1186.e9-14. [DOI: 10.1016/j.urology.2011.12.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 11/15/2011] [Accepted: 12/16/2011] [Indexed: 11/23/2022]
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Saito M, Ohmasa F, Tsounapi P, Inoue S, Dimitriadis F, Kinoshita Y, Satoh K. Nicorandil ameliorates hypertension-related bladder dysfunction in the rat. Neurourol Urodyn 2012; 31:695-701. [DOI: 10.1002/nau.21213] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 08/01/2011] [Indexed: 11/09/2022]
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Oudot A, Oger S, Behr-Roussel D, Caisey S, Bernabé J, Alexandre L, Giuliano F. A new experimental rat model of erectile dysfunction and lower urinary tract symptoms associated with benign prostatic hyperplasia: the testosterone-supplemented spontaneously hypertensive rat. BJU Int 2012; 110:1352-8. [DOI: 10.1111/j.1464-410x.2012.11085.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kang YJ, Jin LH, Park CS, Shin HY, Yoon SM, Lee T. Early sequential changes in bladder function after partial bladder outlet obstruction in awake sprague-dawley rats: focus on the decompensated bladder. Korean J Urol 2011; 52:835-41. [PMID: 22216396 PMCID: PMC3246516 DOI: 10.4111/kju.2011.52.12.835] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Accepted: 10/11/2011] [Indexed: 11/18/2022] Open
Abstract
PURPOSE We investigated bladder function, with special focus on initial functional changes, by objective report of decompensated bladder according to the percentage of residual urine volume to bladder capacity in awake, obstructed rats. MATERIALS AND METHODS Thirty rats were randomly subjected to sham operations (n=10) or partial bladder outlet obstruction (BOO, n=20). Cystometric investigations were performed without anesthesia 1 or 2 weeks after BOO surgery. To reduce the influence of confounding factors in awake cystometry, we used simultaneous recordings of intravesical and intraabdominal pressures. Decompensated bladder was defined as the bladder with more than 20% of residual volume compared with bladder capacity. RESULTS Compared with that in sham animals, basal pressure was elevated in both BOO groups. Threshold pressure was higher in the 2 week BOO (p<0.01) group. Compliance was decreased in the 1 week BOO group (p<0.01) and increased in the 2 week BOO group (p<0.001). Bladder capacity was not increased in the 1 week BOO group, but was increased in the 2 week BOO group (p<0.01). Decompensation was found in 62.5% of the 1 week BOO group and in 33.3% of the 2 week BOO group. CONCLUSIONS From the earlier phase, the bladders exhibited serial changes in pressure and volume parameters, and decompensated bladders defined by the percentage of residual volume to bladder capacity could be seen. During the later phase, there was an increasing tendency of compensated bladders, accompanied by the bladders being enlarged and more compliant.
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Affiliation(s)
- Yong-Jin Kang
- Department of Urology, Inha University College of Medicine by BK 21 Project, Incheon, Korea
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Inoue S, Saito M, Tsounapi P, Dimitriadis F, Ohmasa F, Kinoshita Y, Satoh K, Takenaka A. Effect of silodosin on detrusor overactivity in the male spontaneously hypertensive rat. BJU Int 2011; 110:E118-24. [DOI: 10.1111/j.1464-410x.2011.10814.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Andersson KE, Soler R, Füllhase C. Rodent models for urodynamic investigation. Neurourol Urodyn 2011; 30:636-46. [PMID: 21661007 DOI: 10.1002/nau.21108] [Citation(s) in RCA: 153] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Rodents, most commonly rats, mice, and guinea pigs are widely used to investigate urinary storage and voiding functions, both in normal animals and in models of disease. An often used methodology is cystometry. Micturitions in rodents and humans differ significantly and this must be considered when cystometry is used to interpret voiding in rodent models. Cystometry in humans requires active participation of the investigated patient (subject), and this can for obvious reasons not be achieved in the animals. Cystometric parameters in rodents are often poorly defined and do not correspond to those used in humans. This means that it is important that the terminology used for description of what is measured should be defined, and that the specific terminology used in human cystometry should be avoided. Available disease models in rodents have limited translational value, but despite many limitations, rodent cystometry may give important information on bladder physiology and pharmacology. The present review discusses the principles of urodynamics in rodents, techniques, and terminology, as well as some commonly used disease models, and their translational value.
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Affiliation(s)
- Karl-Erik Andersson
- Wake Forest Institute for Regenerative Medicine, Wake Forest University, Winston Salem, NC, USA.
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Haga N, Aikawa K, Ishibashi K, Yanagida T, Nomiya M, Takahashi N, Shiomi H, Oguro T, Ogawa S, Yamaguchi O. Long-term administration of prazosin improves bladder storage function: Results from a study in spontaneously hypertensive rats. Int J Urol 2011; 18:785-91. [DOI: 10.1111/j.1442-2042.2011.02849.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yono M, Tanaka T, Tsuji S, Irie S, Sakata Y, Otani M, Yoshida M, Latifpour J. Effects of age and hypertension on α1-adrenoceptors in the major source arteries of the rat bladder and penis. Eur J Pharmacol 2011; 670:260-5. [PMID: 21910985 DOI: 10.1016/j.ejphar.2011.08.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 07/26/2011] [Accepted: 08/17/2011] [Indexed: 10/17/2022]
Abstract
α(1)-Adrenoceptors regulate blood pressure, regional vascular resistance and tissue blood flow. As aging and hypertension may impact pelvic arterial blood flow resulting in bladder and penile dysfunction, we investigated effects of age and hypertension on α(1)-adrenoceptors in the major source arteries of the rat bladder and penis. Using radioligand receptor binding, real-time reverse transcription-polymerase chain reaction (RT-PCR) and fluorescent microsphere infusion techniques, we compared 3 and 22-month-old male Fischer rats, and male normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHRs). Twenty-two-month-old rats and SHRs had significantly higher total α(1)-adrenoceptor density in the internal iliac artery and lower blood flow to the bladder and penis than 3-month-old and WKY rats, respectively. RT-PCR data showed an age and hypertension related increase in the expression of α(1B)-adrenoceptor mRNA in the internal iliac, vesical and internal pudendal arteries and a switch from α(1A) predominance in 3-month-old and WKY rats to α(1B)>α(1A) in 22-month-old rats and SHRs. Our data indicate the presence of age and hypertension related alterations in vascular α(1)-adrenoceptor subtype distribution and in blood flow to the rat bladder and penis. These findings suggest that pharmacological blockade of the vascular α(1B)-adrenoceptor, which could increase pelvic blood flow, may contribute to the improvement of bladder and penile dysfunctions in animal models for aging and hypertension.
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Affiliation(s)
- Makoto Yono
- Department of Clinical Pharmacology, Nishi-Kumamoto Hospital, Medical Co. LTA, 1012 Koga, Tomiai-machi, Kumamoto 861-4157, Japan.
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Patra PB, Thorneloe KS. Enhanced Sensitivity to Afferent Stimulation and Impact of Overactive Bladder Therapies in the Conscious, Spontaneously Hypertensive Rat. J Pharmacol Exp Ther 2011; 338:392-9. [DOI: 10.1124/jpet.111.180885] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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Michel MC, Ochodnicky P, Homma Y, Igawa Y. β-adrenoceptor agonist effects in experimental models of bladder dysfunction. Pharmacol Ther 2011; 131:40-9. [PMID: 21510978 DOI: 10.1016/j.pharmthera.2011.03.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Accepted: 03/25/2011] [Indexed: 12/17/2022]
Abstract
β-adrenoceptor stimulation can enhance the storage function of the urinary bladder by acting on detrusor smooth muscle tone, mediator release from the urothelium and/or afferent nerve activity. In humans this may occur predominantly if not exclusively via the β₃-subtype. The effects of β-adrenoceptor agonists including several β₃-selective agonists have been studied in vitro and in vivo, in healthy animals of both genders and various age groups and in a wide range of animal (mostly rat) models of genetic or acquired bladder dysfunction. Such models included bladder irritation by intravesical instillation of acetic acid or prostaglandin E₂, bladder outlet obstruction, stroke, diabetes, spontaneously hypertensive rats, and NO synthase inhibition. Across all of these models β-adrenoceptor agonists had effects consistent with improved bladder storage function. β₃-adrenoceptor effects are resistant to agonist-induced desensitization in many cell types, but whether this also applies to the human bladder is unknown. The efficacy of β-adrenoceptor agonists appears to be largely unaffected by common polymorphisms of the β₃-adrenoceptor gene. Taken together these findings suggest that β₃-adrenoceptor agonists may become useful drugs for the treatment of bladder storage dysfunction, a view supported by recent phase III clinical studies for one such agent, mirabegron.
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Affiliation(s)
- Martin C Michel
- Dept. Pharmacology and Pharmacotherapy, Academic Medical Center, University of Amsterdam, The Netherlands.
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