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Pang S, Yan J. Research and progress on the mechanism of lower urinary tract neuromodulation: a literature review. PeerJ 2024; 12:e17870. [PMID: 39148679 PMCID: PMC11326431 DOI: 10.7717/peerj.17870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Accepted: 07/15/2024] [Indexed: 08/17/2024] Open
Abstract
The storage and periodic voiding of urine in the lower urinary tract are regulated by a complex neural control system that includes the brain, spinal cord, and peripheral autonomic ganglia. Investigating the neuromodulation mechanisms of the lower urinary tract helps to deepen our understanding of urine storage and voiding processes, reveal the mechanisms underlying lower urinary tract dysfunction, and provide new strategies and insights for the treatment and management of related diseases. However, the current understanding of the neuromodulation mechanisms of the lower urinary tract is still limited, and further research methods are needed to elucidate its mechanisms and potential pathological mechanisms. This article provides an overview of the research progress in the functional study of the lower urinary tract system, as well as the key neural regulatory mechanisms during the micturition process. In addition, the commonly used research methods for studying the regulatory mechanisms of the lower urinary tract and the methods for evaluating lower urinary tract function in rodents are discussed. Finally, the latest advances and prospects of artificial intelligence in the research of neuromodulation mechanisms of the lower urinary tract are discussed. This includes the potential roles of machine learning in the diagnosis of lower urinary tract diseases and intelligent-assisted surgical systems, as well as the application of data mining and pattern recognition techniques in advancing lower urinary tract research. Our aim is to provide researchers with novel strategies and insights for the treatment and management of lower urinary tract dysfunction by conducting in-depth research and gaining a comprehensive understanding of the latest advancements in the neural regulation mechanisms of the lower urinary tract.
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Affiliation(s)
- Shutong Pang
- Guangxi Key Laboratory of Special Biomedicine and Advanced Institute for Brain and Intelligence, School of Medicine, Guangxi University, Nanning, Guangxi, China
| | - Junan Yan
- Guangxi Key Laboratory of Special Biomedicine and Advanced Institute for Brain and Intelligence, School of Medicine, Guangxi University, Nanning, Guangxi, China
- Department of Urology, PLA Naval Medical Center, Naval Medical University, Shanghai, China
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Lv R, Li M, Chen X, Li S, Cao N, Gu B. Serotonin (5-HT) 2A/2C receptor agonist 2,5-dimethoxy-4-iodophenyl-2-aminopropane hydrochloride improves detrusor sphincter dyssynergia by inhibiting L-type voltage-gated calcium channels in spinal cord injured rats. CNS Neurosci Ther 2024; 30:e14890. [PMID: 39097910 PMCID: PMC11298198 DOI: 10.1111/cns.14890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 06/11/2024] [Accepted: 07/17/2024] [Indexed: 08/06/2024] Open
Abstract
AIMS To explore the role of voltage-gated calcium channels (VGCC) in 5-HT2A/2C receptor agonist 2,5-dimethoxy-4-iodophenyl-2-aminopropane hydrochloride's improvement of spinal cord injury (SCI) induced detrusor sphincter dyssynergia and the expressions of the 5-hydroxy tryptamine (5-HT) 2A receptors and VGCCs in lumbosacral cord after SCI. METHODS Female Sprague-Dawley rats were randomized into normal control group and SCI group (N = 15 each). Cystometrogram (CMG), simultaneous CMG, and external urethral sphincter electromyography (EUS-EMG) were conducted in all groups under urethane anesthesia. Drugs were administered intrathecally during CMG and EUS-EMG. Rats were euthanized and L6-S1 spinal cord were acquired for immunofluorescence. RESULTS In SCI rats, intrathecal administration of 2,5-dimethoxy-4-iodophenyl-2-aminopropane hydrochloride or L-type VGCC blocker, nifedipine, could significantly increase voiding volume, voiding efficiency, and the number of high-frequency oscillations. They could also prolong EUS bursting activity duration on EUS-EMG. Moreover, the effect of 2,5-dimethoxy-4-iodophenyl-2-aminopropane hydrochloride can be eliminated with the combined administration of L-type VGCC agonist, (±)-Bay K 8644. No significant differences were observed in CMG after intrathecal administration of T-type VGCC blocker TTA-P2. Additionally, immunofluorescence of the lumbosacral cord in control and SCI rats showed that the 5-HT2A receptor and Cav1.2 immunolabeling-positive neurons in the anterior horn of the lumbosacral cord were increased in SCI rats. CONCLUSIONS Our study demonstrated that 5-HT2A/2C agonist 2,5-dimethoxy-4-iodophenyl-2-aminopropane hydrochloride may improve SCI-induced DSD by inhibiting the L-type voltage-gated calcium channel in lumbosacral cord motoneurons.
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Affiliation(s)
- Rong Lv
- Department of UrologyShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
| | - Mingzhuo Li
- Department of UrologyShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
| | - Xun Chen
- Department of UrologyShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
| | - Shengtian Li
- Bio‐X Institutes, Key laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Key Laboratory of Psychotic Disorders, Brain Science and Technology Research CenterShanghai Jiao Tong UniversityShanghaiChina
| | - Nailong Cao
- Department of UrologyShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
| | - Baojun Gu
- Department of UrologyShanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghaiChina
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Khasanah N, Chin HY, Lo WL, Lin BS, Chen HC, Liou JC, Wu CW, Peng CW. Sacral Magnetic Neuromodulation with Intermittent Theta Burst Waveform Enhances Overactive Bladder: In Vivo Study. Biomed J 2024:100775. [PMID: 39059583 DOI: 10.1016/j.bj.2024.100775] [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: 03/03/2024] [Revised: 06/20/2024] [Accepted: 07/24/2024] [Indexed: 07/28/2024] Open
Abstract
BACKGROUND The current treatment options for overactive bladder (OAB) continue to pose challenges for refractory cases and may involve invasive procedures. To assess the potential benefit of non-invasive repetitive peripheral magnetic stimulation (rPMS) on sacral roots using intermittent theta burst stimulation (iTBS) as treatment option for OAB. The study involved a total of 33 rats, which were divided into three different experimental phases. MATERIALS AND METHODS To induce bladder overactivity rats were pretreated with a continuous transvesical infusion of 0.5% acetic acid (AA). During bladder infusion, the intravesical pressure was recorded using cystometrography (CMG) to investigate the effects of AA pretreatment and the therapeutic intervention of acute sacral rPMS using iTBS. RESULTS Pre-application of rPMS with iTBS at a 100% intensity significantly extended the mean first voiding time (Tv) in normal healthy rats to 132%. Acute rPMS iTBS at a 100% intensity resulted in a significant increase of the inter-contraction interval (ICI) to 121%. An AA model was established with continuous saline infusion after 0.5% AA treatment and resulted in significant reductions of Tv to 42% and ICI to 56% of the corresponding control values. Subsequently, rPMS iTBS at a 100% intensity on the sacral nerve effectively inhibited AA-induced bladder overactivity and significantly increased the ICI to 167%∼222%. No significant changes in maximum bladder pressure (Pmax) were found. CONCLUSIONS Sacral nerve rPMS with iTBS demonstrated the ability to suppress AA-induced bladder overactivity. This promising modality could be developed as an alternative approach to enhance bladder continence in OAB syndrome patients.
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Affiliation(s)
- Nurida Khasanah
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan; Department of Obstetrics and Gynecology, Faculty of Medicine Public Health and Nursing, Universitas Gadjah Mada-Dr Sardjito General Hospital, Yogyakarta 55281, Indonesia
| | - Hung-Yen Chin
- Department of Obstetrics and Gynecology, Taipei Medical University Hospital, Taipei 11031, Taiwan; Department of Obstetrics and Gynecology, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
| | - Wei-Lun Lo
- Division of Neurosurgery, Department of Surgery, Shuang Ho Hospital, Taipei Medical University, New Taipei City 235041, Taiwan; Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan
| | - Bor-Shing Lin
- Department of Computer Science and Information Engineering, National Taipei University, New Taipei City 237303, Taiwan
| | - Hung-Chou Chen
- Department of Physical Medicine and Rehabilitation, School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan; Department of Physical Medicine and Rehabilitation, Shuang Ho Hospital, Taipei Medical University, New Taipei City 23561, Taiwan
| | - Jian-Chiun Liou
- School of Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan
| | - Chun-Wei Wu
- School of Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan
| | - Chih-Wei Peng
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan; School of Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan; School of Gerontology and Long-Term Care, College of Nursing, Taipei Medical University, Taipei 11031, Taiwan.
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Hughes FM, Harper SN, Jin H, Odom MR, Todd Purves J. Strict glucose control and elimination of NLRP3-induced inflammation prevents diabetic bladder dysfunction in the female Akita mouse model. Neurourol Urodyn 2024. [PMID: 39032077 DOI: 10.1002/nau.25554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 06/04/2024] [Accepted: 06/21/2024] [Indexed: 07/22/2024]
Abstract
PURPOSE Diabetic bladder dysfunction (DBD) is the most common diabetic complication. Logically, regulation of blood glucose should reverse dysfunction, but the Epidemiology of Diabetes Interventions and Complications study found strict control ineffective. However, it is possible that strict control may prevent DBD if initiated before symptoms appear. We examine the effect of early glucose control on development of DBD in the female diabetic Akita mouse (Type 1) and test the potential of inhibiting/deleting NLRP3 as adjunct therapy to glucose control. MATERIALS AND METHODS Female Akita mice were bred NLRP3+/+ or NLRP3-/-. At 6 weeks of age, diabetics received either no glucose control or insulin pellets (s.c., Linshin) designed to poorly or strictly control blood glucose. At Week 15, blood glucose (glucometer), the extravasation potential of bladder (an indirect measurement of inflammation) and bladder function (urodynamics) were assessed. RESULTS Blood glucose of diabetics was reduced in poorly controlled and strongly reduced in strictly controlled groups. Levels were not affected by deletion of NLRP3. Evans blue dye extravasation correlated with glucose control and was eliminated in the NLRP3-/- groups. Urodynamics found markers of overactivity in diabetics which was improved in the poorly controlled group and eliminated in the strictly controlled group. In the NLRP3-/- mice, no bladder dysfunction developed, regardless of glucose control. CONCLUSIONS Early-initiated strict glycemic control and NLRP3 elimination can effectively prevent DBD, suggesting hyperglycemia acts through NLRP3-induced inflammation to trigger DBD.
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Affiliation(s)
- Francis M Hughes
- Department of Urology, Duke University Medical Center, Division of Urology, Durham, North Carolina, USA
| | - Shelby N Harper
- Department of Urology, Duke University Medical Center, Division of Urology, Durham, North Carolina, USA
| | - Huixia Jin
- Department of Urology, Duke University Medical Center, Division of Urology, Durham, North Carolina, USA
| | - Michael R Odom
- Department of Urology, Duke University Medical Center, Division of Urology, Durham, North Carolina, USA
| | - J Todd Purves
- Department of Urology, Duke University Medical Center, Division of Urology, Durham, North Carolina, USA
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Rana S, Alom F, Martinez RC, Fuller DD, Mickle AD. Acute ampakines increase voiding function and coordination in a rat model of SCI. eLife 2024; 12:RP89767. [PMID: 38451184 PMCID: PMC10962400 DOI: 10.7554/elife.89767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024] Open
Abstract
Neurogenic bladder dysfunction causes urological complications and reduces the quality of life in persons with spinal cord injury (SCI). Glutamatergic signaling via AMPA receptors is fundamentally important to the neural circuits controlling bladder voiding. Ampakines are positive allosteric modulators of AMPA receptors that can enhance the function of glutamatergic neural circuits after SCI. We hypothesized that ampakines can acutely stimulate bladder voiding that has been impaired due to thoracic contusion SCI. Adult female Sprague-Dawley rats received a unilateral contusion of the T9 spinal cord (n = 10). Bladder function (cystometry) and coordination with the external urethral sphincter (EUS) were assessed 5 d post-SCI under urethane anesthesia. Data were compared to responses in spinal-intact rats (n = 8). The 'low-impact' ampakine CX1739 (5, 10, or 15 mg/kg) or vehicle (2-hydroxypropyl-beta-cyclodextrin [HPCD]) was administered intravenously. The HPCD vehicle had no discernible impact on voiding. In contrast, following CX1739, the pressure threshold for inducing bladder contraction, voided volume, and the interval between bladder contractions were significantly reduced. These responses occurred in a dose-dependent manner. We conclude that modulating AMPA receptor function using ampakines can rapidly improve bladder-voiding capability at subacute time points following contusion SCI. These results may provide a new and translatable method for therapeutic targeting of bladder dysfunction acutely after SCI.
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Affiliation(s)
- Sabhya Rana
- Department of Physical Therapy, University of FloridaGainesvilleUnited States
- McKnight Brain Institute, University of FloridaGainesvilleUnited States
- Breathing Research and Therapeutics CenterGainesvilleUnited States
| | - Firoj Alom
- Department of Physiological Sciences, College of Veterinary Medicine, University of FloridaGainesvilleUnited States
- Department of Veterinary and Animal Sciences, University of RajshahiRajshahiBangladesh
| | - Robert C Martinez
- Department of Physical Therapy, University of FloridaGainesvilleUnited States
- McKnight Brain Institute, University of FloridaGainesvilleUnited States
- Breathing Research and Therapeutics CenterGainesvilleUnited States
| | - David D Fuller
- Department of Physical Therapy, University of FloridaGainesvilleUnited States
- McKnight Brain Institute, University of FloridaGainesvilleUnited States
- Breathing Research and Therapeutics CenterGainesvilleUnited States
| | - Aaron D Mickle
- McKnight Brain Institute, University of FloridaGainesvilleUnited States
- Department of Physiological Sciences, College of Veterinary Medicine, University of FloridaGainesvilleUnited States
- Department of Veterinary and Animal Sciences, University of RajshahiRajshahiBangladesh
- J. Crayton Pruitt Family Department of Biomedical Engineering, College of Engineering, University of FloridaGainesvilleUnited States
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Kitta T, Ogawa T, Kuno S, Kakizaki H, Yoshimura N. Review: Lower urinary tract dysfunction in animal models of Parkinson's disease (PD): Translational aspects for the treatment of PD patients with overactive bladder. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2024; 174:211-230. [PMID: 38341230 DOI: 10.1016/bs.irn.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
Although the loss of dopaminergic neurons in the substantia nigra and consequent motor symptoms are the hallmarks of Parkinson's disease (PD), several non-motor symptoms may appear prior to these typical motor symptoms. While a variety of non-motor symptoms have emerged as the primary predictor of PD patients' quality of life, even though motor symptoms are undoubtedly distressing. According to a study, the prevalence of lower urinary tract symptoms (LUTS) varies between 27% and 64%, suggesting that PD-related lower urinary tract dysfunction may be affected by the disease stage, the presence of concomitant conditions affecting the lower urinary tract, and other autonomic dysfunctions. Animal models can serve as a platform for research into the causes of PD-related dysfunction and the evaluation of cutting-edge therapeutic approaches although the majority of animal research have been directed toward motor symptoms of PD. At present, the cause of lower urinary tract dysfunction in PD has not been fully clarified although the increasing evidence showing the multiple mechanisms underlying PD-related LUTS has emerged. In this chapter we summarize the findings of basic research in the studies of the lower urinary tract dysfunction using with different animal PD models and we try to shed light on the translational aspects for the development of future treatment modalities in PD patients with LUTS.
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Affiliation(s)
- Takeya Kitta
- Department of Renal and Urologic Surgery, Asahikawa Medical University, Asahikawa, Japan
| | - Teruyuki Ogawa
- Department of Urology, Shinshu University School of Medicine, Matsumoto, Japan
| | - Sadako Kuno
- Department of Neurology, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Hidehiro Kakizaki
- Department of Renal and Urologic Surgery, Asahikawa Medical University, Asahikawa, Japan
| | - Naoki Yoshimura
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States.
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Payne SC, Osborne PB, Thompson A, Eiber CD, Keast JR, Fallon JB. Selective recording of physiologically evoked neural activity in a mixed autonomic nerve using a minimally invasive array. APL Bioeng 2023; 7:046110. [PMID: 37928642 PMCID: PMC10625482 DOI: 10.1063/5.0164951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 10/16/2023] [Indexed: 11/07/2023] Open
Abstract
Real-time closed-loop control of neuromodulation devices requires long-term monitoring of neural activity in the peripheral nervous system. Although many signal extraction methods exist, few are both clinically viable and designed for extracting small signals from fragile peripheral visceral nerves. Here, we report that our minimally invasive recording and analysis technology extracts low to negative signal to noise ratio (SNR) neural activity from a visceral nerve with a high degree of specificity for fiber type and class. Complex activity was recorded from the rat pelvic nerve that was physiologically evoked during controlled bladder filling and voiding, in an extensively characterized in vivo model that provided an excellent test bed to validate our technology. Urethane-anesthetized male rats (n = 12) were implanted with a four-electrode planar array and the bladder instrumented for continuous-flow cystometry, which measures urodynamic function by recording bladder pressure changes during constant infusion of saline. We demonstrated that differential bipolar recordings and cross-correlation analyses extracts afferent and efferent activity, and discriminated between subpopulations of fibers based on conduction velocity. Integrated Aδ afferent fiber activity correlated with bladder pressure during voiding (r2: 0.66 ± 0.06) and was not affected by activating nociceptive afferents with intravesical capsaicin (r2: 0.59 ± 0.14, P = 0.54, and n = 3). Collectively, these results demonstrate our minimally invasive recording and analysis technology is selective in extracting mixed neural activity with low/negative SNR. Furthermore, integrated afferent activity reliably correlates with bladder pressure and is a promising first step in developing closed-loop technology for bladder control.
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Affiliation(s)
| | - Peregrine B. Osborne
- Department of Anatomy and Physiology, University of Melbourne, Victoria 3010, Australia
| | | | - Calvin D. Eiber
- Department of Anatomy and Physiology, University of Melbourne, Victoria 3010, Australia
| | - Janet R. Keast
- Department of Anatomy and Physiology, University of Melbourne, Victoria 3010, Australia
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Rana S, Alom F, Martinez RC, Fuller DD, Mickle AD. Acute ampakines increase voiding function and coordination in a rat model of SCI. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.26.542339. [PMID: 37293023 PMCID: PMC10245998 DOI: 10.1101/2023.05.26.542339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Neurogenic bladder dysfunction causes urological complications and reduces the quality of life in persons with spinal cord injury (SCI). Glutamatergic signaling via AMPA receptors is fundamentally important to the neural circuits controlling bladder voiding. Ampakines are positive allosteric modulators of AMPA receptors that can enhance the function of glutamatergic neural circuits after SCI. We hypothesized that ampakines can acutely stimulate bladder voiding that has been impaired due to thoracic contusion SCI. Adult female Sprague Dawley rats received a unilateral contusion of the T9 spinal cord (n=10). Bladder function (cystometry) and coordination with the external urethral sphincter (EUS) were assessed five days post-SCI under urethane anesthesia. Data were compared to responses in spinal intact rats (n=8). The "low impact" ampakine CX1739 (5, 10, or 15 mg/kg) or vehicle (HPCD) was administered intravenously. The HPCD vehicle had no discernable impact on voiding. In contrast, following CX1739, the pressure threshold for inducing bladder contraction, voided volume, and the interval between bladder contractions were significantly reduced. These responses occurred in a dose-dependent manner. We conclude that modulating AMPA receptor function using ampakines can rapidly improve bladder voiding capability at sub-acute time points following contusion SCI. These results may provide a new and translatable method for therapeutic targeting of bladder dysfunction acutely after SCI.
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Affiliation(s)
- Sabhya Rana
- Department of Physical Therapy, University of Florida, Gainesville, FL, 32610
- McKnight Brain Institute, University of Florida, Gainesville, FL, 32610
- Breathing Research and Therapeutics Center, Gainesville, FL, 32610
| | - Firoj Alom
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida
- Department of Veterinary and Animal Sciences, University of Rajshahi, Rajshahi
| | - Robert C Martinez
- Department of Physical Therapy, University of Florida, Gainesville, FL, 32610
- McKnight Brain Institute, University of Florida, Gainesville, FL, 32610
- Breathing Research and Therapeutics Center, Gainesville, FL, 32610
| | - David D Fuller
- Department of Physical Therapy, University of Florida, Gainesville, FL, 32610
- McKnight Brain Institute, University of Florida, Gainesville, FL, 32610
- Breathing Research and Therapeutics Center, Gainesville, FL, 32610
| | - Aaron D Mickle
- McKnight Brain Institute, University of Florida, Gainesville, FL, 32610
- Department of Physiological Sciences, College of Veterinary Medicine, University of Florida
- Department of Veterinary and Animal Sciences, University of Rajshahi, Rajshahi
- J. Crayton Pruitt Family Department of Biomedical Engineering, College of Engineering, University of Florida
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Jaskowak DJ, Danziger ZC. Reflex voiding in rat occurs at consistent bladder volume regardless of pressure or infusion rate. Neurourol Urodyn 2023; 42:1532-1546. [PMID: 37583249 PMCID: PMC10461254 DOI: 10.1002/nau.25243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 06/22/2023] [Accepted: 06/29/2023] [Indexed: 08/17/2023]
Abstract
AIMS The central nervous system (CNS) regulates lower urinary tract reflexes using information from sensory afferents; however, the mechanisms of this process are not well known. Pressure and volume were measured at the onset of the guarding and micturition reflexes across a range of infusion rates to provide insight into what the CNS is gauging to activate reflexes. METHODS Female Sprague Dawley rats were anesthetized with urethane for open outlet cystometry. A set of 10 infusion rates (ranging 0.92-65.5 mL/h) were pseudo-randomly distributed across 30 single-fill cystometrograms. Bladder pressure and external urethral sphincter electromyography were used for the determination of the onset of the micturition and guarding reflexes, respectively. The bladder volume at the onset of both reflexes was estimated from the total infusion rate during a single fill. RESULTS In response to many single-fill cystometrograms, there was an increased volume the bladder could store without a significant increase in pressure. Volume was adjusted for this effect for the analysis of how pressure and volume varied with infusion rate at the onset of the micturition and guarding reflexes. In 25 rats, the micturition reflex was evoked at similar volumes across all infusion rates, whereas the pressure at micturition reflex onset increased with increasing infusion rates. In 11 rats, the guarding reflex was evoked at similar pressures across infusion rates, but the volume decreased with increasing infusion rates. CONCLUSIONS These results suggest that the CNS is interpreting volume from the bladder to activate the micturition reflex and pressure from the bladder to activate the guarding reflex.
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Affiliation(s)
- Daniel J Jaskowak
- Department of Biomedical Engineering, Florida International University, Miami, Florida, USA
| | - Zachary C Danziger
- Department of Biomedical Engineering, Florida International University, Miami, Florida, USA
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Wang J, Ren L, Liu X, Xu W, Liu M, Hu P, Wang T, Liu J, Ling Q. Transcriptomics Reveals Molecular Features of the Bilateral Pelvic Nerve Injury Rat Model of Detrusor Underactivity. Biomolecules 2023; 13:1260. [PMID: 37627325 PMCID: PMC10452637 DOI: 10.3390/biom13081260] [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: 07/19/2023] [Revised: 08/12/2023] [Accepted: 08/16/2023] [Indexed: 08/27/2023] Open
Abstract
The pathogenesis of detrusor underactivity (DU) is unclear, and the available therapeutic effects are unsatisfactory. We propose to find key molecules and pathways related to DU based on transcriptome sequencing. A rat model of bilateral pelvic nerve injury (BPNI) was established. Bladder tissues from the sham-operated group, 3 and 28 days after BPNI mapping, were taken for urodynamics, histopathology, and RNA-seq. An enrichment analysis of the screened differential expression genes was performed. Three days after BPNI, the results showed urodynamic features of overflow incontinence, while there was a recovery at 28 days after the operation. Masson staining revealed collagen deposition accompanied by progressive thickening of the smooth muscle layer as DU progressed. RNA-seq results suggested that a total of 1808 differentially expressed genes (DEGs) differed among the groups. RNA-seq and subsequent analysis confirmed that the cell cycle and immune response were significantly activated 3 days after BPNI, while extracellular matrix remodeling occurred 28 days after BPNI. Partial DEGs and pathways were verified by qRT-PCR. Validation of key proteins involved in cell cycle, inflammation, and fibrosis was performed by immunohistochemical staining and western blot, respectively. These molecular expression patterns at different time points after BPNI injury provide valuable insights into the search for therapeutic targets for DU.
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Affiliation(s)
- Jiaxin Wang
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Lida Ren
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Xinqi Liu
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Wenchao Xu
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Man Liu
- Department of Geriatrics, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Peng Hu
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Tao Wang
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jihong Liu
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Qing Ling
- Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (J.W.)
- Institute of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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Ou YC, Huang CC, Kao YL, Ho PC, Tsai KJ. Stem Cell Therapy in Spinal Cord Injury-Induced Neurogenic Lower Urinary Tract Dysfunction. Stem Cell Rev Rep 2023; 19:1691-1708. [PMID: 37115409 DOI: 10.1007/s12015-023-10547-9] [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] [Accepted: 04/14/2023] [Indexed: 04/29/2023]
Abstract
Spinal cord injury (SCI) is a devastating condition that enormously affects an individual's health and quality of life. Neurogenic lower urinary tract dysfunction (NLUTD) is one of the most important sequelae induced by SCI, causing complications including urinary tract infection, renal function deterioration, urinary incontinence, and voiding dysfunction. Current therapeutic methods for SCI-induced NLUTD mainly target on the urinary bladder, but the outcomes are still far from satisfactory. Stem cell therapy has gained increasing attention for years for its ability to rescue the injured spinal cord directly. Stem cell differentiation and their paracrine effects, including exosomes, are the proposed mechanisms to enhance the recovery from SCI. Several animal studies have demonstrated improvement in bladder function using mesenchymal stem cells (MSCs) and neural stem cells (NSCs). Human clinical trials also provide promising results in urodynamic parameters after MSC therapy. However, there is still uncertainty about the ideal treatment window and application protocol for stem cell therapy. Besides, data on the therapeutic effects regarding NSCs and stem cell-derived exosomes in SCI-related NLUTD are scarce. Therefore, there is a pressing need for further well-designed human clinical trials to translate the stem cell therapy into a formal therapeutic option for SCI-induced NLUTD.
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Affiliation(s)
- Yin-Chien Ou
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan
- Department of Urology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chi-Chen Huang
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan
- Section of Neurosurgery, Department of Surgery, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yao-Lin Kao
- Department of Urology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Pei-Chuan Ho
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan
| | - Kuen-Jer Tsai
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, No. 1, University Road, Tainan, 701, Taiwan.
- Research Center of Clinical Medicine, National Cheng Kung University Hospital , College of Medicine, National Cheng Kung University, Tainan, Taiwan.
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12
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Medina-Aguiñaga D, Hoey RF, Wilkins NL, Ugiliweneza B, Fell J, Harkema SJ, Hubscher CH. Mid-lumbar (L3) epidural stimulation effects on bladder and external urethral sphincter in non-injured and chronically transected urethane-anesthetized rats. Sci Rep 2023; 13:12258. [PMID: 37507456 PMCID: PMC10382500 DOI: 10.1038/s41598-023-39388-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/25/2023] [Indexed: 07/30/2023] Open
Abstract
Recent pre-clinical and clinical spinal cord epidural stimulation (scES) experiments specifically targeting the thoracolumbar and lumbosacral circuitries mediating lower urinary tract (LUT) function have shown improvements in storage, detrusor pressure, and emptying. With the existence of a lumbar spinal coordinating center in rats that is involved with external urethral sphincter (EUS) functionality during micturition, the mid-lumbar spinal cord (specifically L3) was targeted in the current study with scES to determine if the EUS and thus the void pattern could be modulated, using both intact and chronic complete spinal cord injured female rats under urethane anesthesia. L3 scES at select frequencies and intensities of stimulation produced a reduction in void volumes and EUS burst duration in intact rats. After chronic transection, three different subgroups of LUT dysfunction were identified and the response to L3 scES promoted different cystometry outcomes, including changes in EUS bursting. The current findings suggest that scES at the L3 level can generate functional neuromodulation of both the urinary bladder and the EUS in intact and SCI rats to enhance voiding in a variety of clinical scenarios.
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Affiliation(s)
- Daniel Medina-Aguiñaga
- Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 S. Floyd St., MDR, Room 111, Louisville, KY, 40202, USA
| | - Robert F Hoey
- Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 S. Floyd St., MDR, Room 111, Louisville, KY, 40202, USA
- Physical Medicine and Rehabilitation Department, MetroHealth Rehabilitation Institute of Ohio, Cleveland, OH, USA
- Physical Medicine and Rehabilitiation Department, Case Western Reserve University School of Medicine, Cleveland, OH, USA
| | - Natasha L Wilkins
- Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 S. Floyd St., MDR, Room 111, Louisville, KY, 40202, USA
| | - Beatrice Ugiliweneza
- Department of Neurological Surgery, University of Louisville School of Medicine, Louisville, KY, USA
- Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, KY, USA
- Department of Health Management and Systems Science, School of Public Health and Information Science, University of Louisville, Louisville, KY, USA
| | - Jason Fell
- Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 S. Floyd St., MDR, Room 111, Louisville, KY, 40202, USA
| | - Susan J Harkema
- Department of Neurological Surgery, University of Louisville School of Medicine, Louisville, KY, USA
- Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, KY, USA
| | - Charles H Hubscher
- Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, 511 S. Floyd St., MDR, Room 111, Louisville, KY, 40202, USA.
- Kentucky Spinal Cord Injury Research Center, University of Louisville, Louisville, KY, USA.
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13
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Doelman AW, Streijger F, Majerus SJA, Damaser MS, Kwon BK. Assessing Neurogenic Lower Urinary Tract Dysfunction after Spinal Cord Injury: Animal Models in Preclinical Neuro-Urology Research. Biomedicines 2023; 11:1539. [PMID: 37371634 DOI: 10.3390/biomedicines11061539] [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: 05/04/2023] [Revised: 05/20/2023] [Accepted: 05/21/2023] [Indexed: 06/29/2023] Open
Abstract
Neurogenic bladder dysfunction is a condition that affects both bladder storage and voiding function and remains one of the leading causes of morbidity after spinal cord injury (SCI). The vast majority of individuals with severe SCI develop neurogenic lower urinary tract dysfunction (NLUTD), with symptoms ranging from neurogenic detrusor overactivity, detrusor sphincter dyssynergia, or sphincter underactivity depending on the location and extent of the spinal lesion. Animal models are critical to our fundamental understanding of lower urinary tract function and its dysfunction after SCI, in addition to providing a platform for the assessment of potential therapies. Given the need to develop and evaluate novel assessment tools, as well as therapeutic approaches in animal models of SCI prior to human translation, urodynamics assessment techniques have been implemented to measure NLUTD function in a variety of animals, including rats, mice, cats, dogs and pigs. In this narrative review, we summarize the literature on the use of animal models for cystometry testing in the assessment of SCI-related NLUTD. We also discuss the advantages and disadvantages of various animal models, and opportunities for future research.
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Affiliation(s)
- Adam W Doelman
- International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, BC V5Z 1M9, Canada
| | - Femke Streijger
- International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, BC V5Z 1M9, Canada
| | - Steve J A Majerus
- Department of Electrical, Computer and Systems Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
- Advanced Platform Technology Center, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106, USA
| | - Margot S Damaser
- Advanced Platform Technology Center, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106, USA
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Brian K Kwon
- International Collaboration on Repair Discoveries, University of British Columbia, Vancouver, BC V5Z 1M9, Canada
- Department of Orthopaedics, Vancouver Spine Surgery Institute, University of British Columbia, Vancouver, BC V5Z 1M9, Canada
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14
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Ferreira A, Nascimento D, Cruz CD. Molecular Mechanism Operating in Animal Models of Neurogenic Detrusor Overactivity: A Systematic Review Focusing on Bladder Dysfunction of Neurogenic Origin. Int J Mol Sci 2023; 24:ijms24043273. [PMID: 36834694 PMCID: PMC9959149 DOI: 10.3390/ijms24043273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/12/2023] [Accepted: 01/18/2023] [Indexed: 02/10/2023] Open
Abstract
Neurogenic detrusor overactivity (NDO) is a severe lower urinary tract disorder, characterized by urinary urgency, retention, and incontinence, as a result of a neurologic lesion that results in damage in neuronal pathways controlling micturition. The purpose of this review is to provide a comprehensive framework of the currently used animal models for the investigation of this disorder, focusing on the molecular mechanisms of NDO. An electronic search was performed with PubMed and Scopus for literature describing animal models of NDO used in the last 10 years. The search retrieved 648 articles, of which reviews and non-original articles were excluded. After careful selection, 51 studies were included for analysis. Spinal cord injury (SCI) was the most frequently used model to study NDO, followed by animal models of neurodegenerative disorders, meningomyelocele, and stroke. Rats were the most commonly used animal, particularly females. Most studies evaluated bladder function through urodynamic methods, with awake cystometry being particularly preferred. Several molecular mechanisms have been identified, including changes in inflammatory processes, regulation of cell survival, and neuronal receptors. In the NDO bladder, inflammatory markers, apoptosis-related factors, and ischemia- and fibrosis-related molecules were found to be upregulated. Purinergic, cholinergic, and adrenergic receptors were downregulated, as most neuronal markers. In neuronal tissue, neurotrophic factors, apoptosis-related factors, and ischemia-associated molecules are increased, as well as markers of microglial and astrocytes at lesion sites. Animal models of NDO have been crucial for understanding the pathophysiology of lower urinary tract (LUT) dysfunction. Despite the heterogeneity of animal models for NDO onset, most studies rely on traumatic SCI models rather than other NDO-driven pathologies, which may result in some issues when translating pre-clinical observations to clinical settings other than SCI.
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Affiliation(s)
- Ana Ferreira
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, 4200-319 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde-i3S and IBMC, Universidade do Porto, 4200-319 Porto, Portugal
| | - Diogo Nascimento
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, 4200-319 Porto, Portugal
| | - Célia Duarte Cruz
- Experimental Biology Unit, Department of Biomedicine, Faculty of Medicine of Porto, University of Porto, 4200-319 Porto, Portugal
- Instituto de Investigação e Inovação em Saúde-i3S and IBMC, Universidade do Porto, 4200-319 Porto, Portugal
- Correspondence: ; Tel.: +351-220426740; Fax: +351-225513655
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15
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Hao F, Jia F, Hao P, Duan H, Wang Z, Fan Y, Zhao W, Gao Y, Fan OR, Xu F, Yang Z, Sun YE, Li X. Proper wiring of newborn neurons to control bladder function after complete spinal cord injury. Biomaterials 2023; 292:121919. [PMID: 36455486 DOI: 10.1016/j.biomaterials.2022.121919] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 10/14/2022] [Accepted: 11/18/2022] [Indexed: 11/26/2022]
Abstract
Activation of endogenous neurogenesis by bioactive materials enables restoration of sensory/motor function after complete spinal cord injury (SCI) via formation of new relay neural circuits. The underlying wiring logic of newborn neurons in adult central nervous system (CNS) is unknown. Here, we report neurotrophin3-loaded chitosan biomaterial substantially recovered bladder function after SCI. Multiple neuro-circuitry tracing technologies using pseudorabies virus (PRV), rabies virus (RV), and anterograde adeno-associated virus (AAV), demonstrated that newborn neurons were integrated into the micturition neural circuits and reconnected higher brain centers and lower spinal cord centers to control voiding, and participated in the restoration of the lower urinary tract function, even in the absence of long-distance axonal regeneration. Opto- and chemo-genetic studies further supported the notion that the supraspinal control of the lower urinary tract function was partially recovered. Our data demonstrated that regenerated relay neurons could be properly integrated into disrupted long-range neural circuits to restore function of adult CNS.
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Affiliation(s)
- Fei Hao
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Engineering Medicine, Beihang University, Beijing, 100191, China
| | - Fan Jia
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, The Brain Cognition and Brain Disease Institute (BCBDI), Translational Research Center for the Nervous System (TRCNS), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences; Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, 518055, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Peng Hao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Hongmei Duan
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Zijue Wang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of the Ministry of Education, Beijing Advanced Innovation Centre for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100191, China; School of Engineering Medicine, Beihang University, Beijing, 100191, China
| | - Wen Zhao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Yudan Gao
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China
| | - Orion R Fan
- Department of Evolution and Ecology, University of California, Davis, CA, 90007, USA
| | - Fuqiang Xu
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, The Brain Cognition and Brain Disease Institute (BCBDI), Translational Research Center for the Nervous System (TRCNS), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences; Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen, 518055, China; University of Chinese Academy of Sciences, Beijing, 100049, China; State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Center for Magnetic Resonance, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, China.
| | - Zhaoyang Yang
- Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China.
| | - Yi E Sun
- Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration (Tongji University), Ministry of Education, Shanghai, 200065, China; Shanghai Institute of Stem Cell Research and Clinical Translation, Shanghai East Hospital, Tongji University, School of Medicine, Shanghai, 200120, China.
| | - Xiaoguang Li
- Beijing Key Laboratory for Biomaterials and Neural Regeneration, School of Engineering Medicine, Beihang University, Beijing, 100191, China; Department of Neurobiology, School of Basic Medical Sciences, Capital Medical University, Beijing, 100069, China.
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16
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Initiating daily acute intermittent hypoxia (dAIH) therapy at 1-week after contusion spinal cord injury (SCI) improves lower urinary tract function in rat. Exp Neurol 2023; 359:114242. [PMID: 36240880 DOI: 10.1016/j.expneurol.2022.114242] [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: 04/17/2022] [Revised: 09/15/2022] [Accepted: 10/05/2022] [Indexed: 11/07/2022]
Abstract
Spinal cord injury (SCI) above the level of the lumbosacral spinal cord produces lower urinary tract (LUT) dysfunction, resulting in impairment of urine storage and elimination (voiding). While spontaneous functional recovery occurs due to remodeling of spinal reflex micturition pathways, it is incomplete, indicating that additional strategies to further augment neural plasticity following SCI are essential. To this end, acute intermittent hypoxia (AIH) exposure has been proposed as a therapeutic strategy for improving recovery of respiratory and other somatic motor function following SCI; however, the impact of AIH as a therapeutic intervention to improve LUT dysfunction remains to be determined. Therefore, we examined the effects of daily AIH (dAIH) on both spontaneous micturition patterns and reflex micturition event (rME) behaviors in adult female Sprague-Dawley rats with mid-thoracic moderate contusion SCI. For these experiments, dAIH gas exposures (five alternating 3 min 12% O2 and 21% O2 episodes) were delivered for 7 consecutive days beginning at 1-week after SCI, with awake micturition patterns being evaluated weekly for 2-3 sessions before and for 4 weeks after SCI and rME behaviors elicited by continuous infusion of saline into the bladder being evaluated under urethane anesthesia at 4-weeks after SCI; daily normoxia (dNx; 21% O2 episodes) served as a control. At 1-week post-SCI, both an areflexic phenotype (i.e., no effective voiding events) and a functional voiding phenotype (i.e., infrequent voiding events with large volumes) were observed in spontaneous micturition patterns (as expected), and subsequent dAIH, but not dNx, treatment led to recovery of spontaneous void frequency pattern to pre-SCI levels; both dAIH- and dNx-treated rats exhibited slightly increased void volumes. At 4-weeks post-SCI, rME behaviors showed increased effectiveness in voiding in dAIH-treated (compared to dNx-treated) rats that included an increase in both bladder contraction pressure (delta BP; P = 0.014) and dynamic voiding efficiency (P = 0.018). Based on the voiding and non-voiding bladder contraction behaviors (VC and NVC, respectively) observed in the BP records, bladder dysfunction severity was classified into mild, moderate, and severe phenotypes, and while rats in both treatment groups included each severity phenotype, the primary phenotype observed in dAIH-treated rats was mild and that in dNx-treated rats was moderate (P = 0.044). Taken together, these findings suggest that 7-day dAIH treatment produces beneficial improvements in LUT function that include recovery of micturition pattern, more efficient voiding, and decreased NVCs, and extend support to the use of dAIH therapy to treat SCI-induced LUT dysfunction.
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17
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Moazzam Z, Yoo PB. Prolonged inhibition of bladder function is evoked by low-amplitude electrical stimulation of the saphenous nerve in urethane-anesthetized rats. Physiol Rep 2022; 10:e15517. [PMID: 36411973 PMCID: PMC9679435 DOI: 10.14814/phy2.15517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 10/20/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023] Open
Abstract
To better understand the effects of saphenous nerve (SN) stimulation on bladder function, we investigated the duration of electrical stimulation as a key variable in eliciting urodynamic changes. SN stimulation is a novel approach to electrically modulating bladder function. In previous animal studies, bladder-inhibitory responses were evoked by low-amplitude (25 μA) stimulus pulses applied in short-duration (10 min) trials and at frequencies between 10 and 20 Hz. Experiments were performed in urethane-anesthetized rats that were separated into three groups: intravesical saline infusion + SN stimulation (group A), intravesical 0.1% acetic acid infusion + SN stimulation (group B), and intravesical saline infusion + no SN stimulation (group C). Changes in bladder function- basal bladder pressure (P base ), contraction amplitude (ΔP), and inter-contraction interval (T ICI )-were measured in response to stimulation trials applied for different durations (10, 20, and 40 min). Trials were also repeated at frequencies of 10 and 20 Hz. In group A, longer-duration (40 min) stimulation trials applied at 10 Hz evoked overflow incontinence (OI) episodes that were characterized by significant changes in P base (122.7 ± 9.1%, p = 0.026), ΔP (-60.8 ± 12.8%, p = 0.044), and T ICI (-43.2 ± 13.0%, p = 0.031). Stimulation-evoked OI was observed in 5 of 8 animals and lasted for 56.5 ± 10.7 min. In contrast, no significant changes in bladder function were observed in either group B or group C. Our findings show that longer-duration trials consisting of electrical pulses applied at 10 Hz are important stimulation parameters that elicit inhibitory bladder responses in anesthetized rodents.
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Affiliation(s)
- Zainab Moazzam
- Institute of Biomedical Engineering (BME)University of TorontoOntarioCanada
| | - Paul B. Yoo
- Institute of Biomedical Engineering (BME)University of TorontoOntarioCanada
- Department of Electrical and Computer EngineeringUniversity of TorontoOntarioCanada
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18
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Bekele BM, Schöwel-Wolf V, Kieshauer J, Marg A, Busjahn A, Davis S, Nugent G, Ebert AK, Spuler S. Human primary muscle stem cells regenerate injured urethral sphincter in athymic rats. Animal Model Exp Med 2022; 5:453-460. [PMID: 36208013 PMCID: PMC9610153 DOI: 10.1002/ame2.12280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 09/26/2022] [Indexed: 11/30/2022] Open
Abstract
Background The aim of the study was to demonstrate the efficacy of human muscle stem cells (MuSCs) isolated using innovative technology in restoring internal urinary sphincter function in a preclinical animal model. Methods Colonies of pure human MuSCs were obtained from muscle biopsy specimens. Athymic rats were subjected to internal urethral sphincter damage by electrocauterization. Five days after injury, 2 × 105 muscle stem cells or medium as control were injected into the area of sphincter damage (n = 5 in each group). Peak bladder pressure and rise in pressure were chosen as outcome measures. To repeatedly obtain the necessary pressure values, telemetry sensors had been implanted into the rat bladders 10 days prior to injury. Results There was a highly significant improvement in the ability to build up peak pressure as well as a pressure rise in animals that had received muscle stem cells as compared to control (p = 0.007) 3 weeks after the cells had been injected. Only minimal histologic evidence of scarring was observed in treated rats. Conclusion Primary human muscle stem cells obtained using innovative technology functionally restore internal urethral sphincter function after injury. Translation into use in clinical settings is foreseeable.
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Affiliation(s)
- Biniam M Bekele
- Muscle Research Unit, Experimental and Clinical Research Center, a cooperation between the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association and the Charité, Universitätsmedizin Berlin, Berlin, Germany.,Charité Universitätsmedizin, Berlin, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Health at Charité Universitätsmedizin, Belrin, Germany
| | - Verena Schöwel-Wolf
- Muscle Research Unit, Experimental and Clinical Research Center, a cooperation between the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association and the Charité, Universitätsmedizin Berlin, Berlin, Germany.,Charité Universitätsmedizin, Berlin, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Health at Charité Universitätsmedizin, Belrin, Germany
| | - Janine Kieshauer
- Muscle Research Unit, Experimental and Clinical Research Center, a cooperation between the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association and the Charité, Universitätsmedizin Berlin, Berlin, Germany.,Charité Universitätsmedizin, Berlin, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Andreas Marg
- Muscle Research Unit, Experimental and Clinical Research Center, a cooperation between the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association and the Charité, Universitätsmedizin Berlin, Berlin, Germany.,Charité Universitätsmedizin, Berlin, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | | | - Sarah Davis
- Charles River Laboratories, Mattawan, Michigan, USA
| | - Gayle Nugent
- Charles River Laboratories, Mattawan, Michigan, USA
| | - Anne-Karoline Ebert
- Department of Urology and Pediatric Urology, University Hospital Ulm, Ulm, Germany
| | - Simone Spuler
- Muscle Research Unit, Experimental and Clinical Research Center, a cooperation between the Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association and the Charité, Universitätsmedizin Berlin, Berlin, Germany.,Charité Universitätsmedizin, Berlin, Germany.,Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Berlin Institute of Health at Charité Universitätsmedizin, Belrin, Germany
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19
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Molecular and Morphological Characteristics of the De-Obstructed Rat Urinary Bladder—An Update. Int J Mol Sci 2022; 23:ijms231911330. [PMID: 36232634 PMCID: PMC9569427 DOI: 10.3390/ijms231911330] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/18/2022] [Accepted: 09/22/2022] [Indexed: 11/30/2022] Open
Abstract
Many patients with outlet obstruction secondary to prostatic enlargement have lower urinary tract symptoms (LUTSs) and an increased frequency of micturition. The standard treatment is transurethral resection of the prostate (TURP), which alleviates obstruction and symptoms. However, after TURP, 20–40 percent of patients continue to experience LUTSs. The aim of the present study in rats was to identify the mechanisms that do not normalize after the removal of the obstruction and that could explain the persisting symptoms. We had microarray data from control, obstructed, and de-obstructed female rat bladders, which made it possible to study 14,553 mRNA expressions. We also had a bank of electron micrographs from similar detrusors. Microarrays: There were significant differences between the control and obstructed bladders for 1111 mRNAs. The obstructed and de-obstructed bladders differed significantly for 1059 mRNAs. The controls and the de-obstructed bladders differed significantly for 798 mRNAs. We observed many mRNAs that were increased in the obstructed bladder and then decreased to control levels after de-obstruction, and many mRNAs that were decreased in the obstructed bladder and then increased following de-obstruction. mRNAs that were significantly higher or lower in the de-obstructed bladder than in the control bladder were also found. Ultrastructure: The detrusor cells in the obstructed bladders had cross-sectional areas that were much larger than those in the controls. The control cells had smooth outlines and similar cross-sectional areas. The de-obstructed detrusor cells had larger cross-sectional areas than the controls, as well as corrugated surfaces. The cell areas varied, suggesting that the shrinkage of the de-obstructed cells was not even. We did not find any points of contact of the gap junction plaque type between the detrusor cells. There were abundant finger-like processes between the detrusor cells in the obstructed and in de-obstructed bladders, which were only occasionally found in the control detrusors. They are the only possible localization for gap junction channels. The de-obstructed rat bladder is not an organ with properties intermediate between those of the control and obstructed bladders. Instead, de-obstructed bladders have gene expressions, morphologies, and functional properties of the individual cells and their organization, which make them distinctly different from both control and obstructed bladders.
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20
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Li J, Li S, Wang Y, Shang A. Functional, morphological and molecular characteristics in a novel rat model of spinal sacral nerve injury-surgical approach, pathological process and clinical relevance. Sci Rep 2022; 12:10026. [PMID: 35705577 PMCID: PMC9200741 DOI: 10.1038/s41598-022-13254-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 01/19/2022] [Indexed: 02/05/2023] Open
Abstract
Spinal sacral nerve injury represents one of the most serious conditions associated with many diseases such as sacral fracture, tethered cord syndrome and sacral canal tumor. Spinal sacral nerve injury could cause bladder denervation and detrusor underactivity. There is limited clinical experience resolving spinal sacral nerve injury associated detrusor underactivity patients, and thus the treatment options are also scarce. In this study, we established a spinal sacral nerve injury animal model for deeper understanding and further researching of this disease. Forty 8 w (week) old Sprague Dawley rats were included and equally divided into sham (n = 20) and crush group (n = 20). Bilateral spinal sacral nerves of rats were crushed in crush group, and sham group received same procedure without nerve crush. Comprehensive evaluations at three time points (1 w, 4 w and 6 w) were performed to comprehend the nature process of this disease. According to urodynamic test, ultrasonography and retrograde urography, we could demonstrate severe bladder dysfunction after spinal sacral nerve injury along the observation period compared with sham group. These functional changes were further reflected by histological examination (hematoxylin-eosin and Masson's trichrome staining) of microstructure of nerves and bladders. Immunostaining of nerve/bladder revealed schwann cell death, axon degeneration and collagen remodeling of bladder. Polymerase Chain Reaction results revealed vigorous nerve inflammation and bladder fibrosis 1 week after injury and inflammation/fibrosis returned to normal at 4 w. The CatWalk gait analysis was performed and there was no obvious difference between two groups. In conclusion, we established a reliable and reproducible model for spinal sacral nerve injury, this model provided an approach to evaluate the treatment strategies and to understand the pathological process of spinal sacral nerve injuries. It allowed us to understand how nerve degeneration and bladder fibrosis changed following spinal sacral nerve injury and how recovery could be facilitated by therapeutic options for further research.
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Affiliation(s)
- Junyang Li
- The School of Medicine, Nankai University, Tianjin, 300071, China
- Department of Neurosurgery, General Hospital of Chinese People Liberty Army, No. 28 Fuxing Road, Beijing, 100853, China
| | - Shiqiang Li
- The 80Th Group Army Hospital of Chinese People Liberty Army, Shandong, 261021, China
| | - Yu Wang
- Institute of Orthopedics, 4th, Chinese People Liberty Army General Hospital, Beijing, China
- Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, 226007, People's Republic of China
| | - Aijia Shang
- The School of Medicine, Nankai University, Tianjin, 300071, China.
- Department of Neurosurgery, General Hospital of Chinese People Liberty Army, No. 28 Fuxing Road, Beijing, 100853, China.
- Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, 226007, People's Republic of China.
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21
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Aizawa N. [Pathophysiology and pharmacotherapy of benign prostatic disorders]. Nihon Yakurigaku Zasshi 2022; 157:164-167. [PMID: 35491110 DOI: 10.1254/fpj.21103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Men with benign prostatic hyperplasia (BPH) often experience symptoms of overactive bladder (OAB), and bladder outlet obstruction (BOO) is one of cause of BPH. It has been suggested that bladder myogenic microcontractions or micromotions may partly contribute to the development of urgency (bladder sensory (afferent) hypersensitivity) in OAB related to BOO. We have investigated the direct effects of drugs (β3-adrenoceptor agonists, α1-adrenoceptor antagonists, PDE type5 inhibitors) on the bladder afferent function in BOO rats. In our results, almost all drugs may act on the bladder afferent function, and mirabegron inhibits the afferent activities through the suppression of the bladder myogenic microcontractions in BOO condition. Chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS) causes long-standing pain and/or storage symptoms including storage symptoms, such as urgency and frequency. We evaluated the likelihood of deterioration of bladder sensation in a carrageenan-induced CP/CPPS model. In results, the carrageenan-induced CP/CPPS rat model showed edema, ischemia, and inflammatory pain in the prostate, whereas a little change was detected in bladder sensation. These findings demonstrated that the bladder sensation is unlikely deteriorated in this model, suggesting CP/CPPS is possibly overlapping with symptoms in BPH.
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Affiliation(s)
- Naoki Aizawa
- Department of Pharmacology and Toxicology, Dokkyo medical university
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22
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Vamour N, Dequirez PL, Seguier D, Vermersch P, De Wachter S, Biardeau X. Early interventions to prevent lower urinary tract dysfunction after spinal cord injury: a systematic review. Spinal Cord 2022; 60:382-394. [PMID: 35379959 DOI: 10.1038/s41393-022-00784-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 02/25/2022] [Accepted: 02/25/2022] [Indexed: 12/09/2022]
Abstract
STUDY DESIGN Systematic review. OBJECTIVES To synthetise the available scientific literature reporting early interventions to prevent neurogenic lower urinary tract dysfunction (NLUTD) after acute supra-sacral spinal cord injury (SCI). METHODS The present systematic review is reported according to the PRISMA guidelines and identified articles published through April 2021 in the PubMed, Embase, ScienceDirect and Scopus databases with terms for early interventions to prevent NLUTD after SCI. Abstract and full-text screenings were performed by three reviewers independently, while two reviewers performed data extraction independently. An article was considered relevant if it assessed: an in-vivo model of supra-sacral SCI, including a group undergoing an early intervention compared with at least one control group, and reporting clinical, urodynamic, biological and/or histological data. RESULTS Of the 30 studies included in the final synthesis, 9 focused on neurotransmission, 2 on the inflammatory response, 10 on neurotrophicity, 9 on electrical nerve modulation and 1 on multi-system neuroprosthetic training. Overall, 29/30 studies reported significant improvement in urodynamic parameters, for both the storage and the voiding phase. These findings were often associated with substantial modifications at the bladder and spinal cord level, including up/downregulation of neurotransmitters and receptors expression, neural proliferation or axonal sprouting and a reduction of inflammatory response and apoptosis. CONCLUSIONS The present review supports the concept of early interventions to prevent NLUTD after supra-sacral SCI, allowing for the emergence of a potential preventive approach in the coming decades.
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Affiliation(s)
| | | | | | - Patrick Vermersch
- Univ. Lille, Inserm UMR-S1172 LilNCog, Lille Neuroscience and Cognition, CHU Lille, FHU Precise, F-59000, Lille, France
| | - Stefan De Wachter
- Department of Urology, Antwerp University Hospital, Edegem, Belgium.,Antwerp Surgical Training, Anatomy and Research Centre (ASTARC), Faculty of Medicine and Health Sciences, Wlrijk, Belgium
| | - Xavier Biardeau
- Univ. Lille, Inserm UMR-S1172 LilNCog, Lille Neuroscience and Cognition, CHU Lille, F-59000, Lille, France
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23
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Aizawa N, Fujita T. The TRPM8 channel as a potential therapeutic target for bladder hypersensitive disorders. J Smooth Muscle Res 2022; 58:11-21. [PMID: 35354708 PMCID: PMC8961290 DOI: 10.1540/jsmr.58.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In the lower urinary tract, transient receptor potential (TRP) channels are primarily involved in physiological function, especially in cellular sensors responding to chemical and physical stimuli. Among TRP channels, TRP melastatin 8 (TRPM8) channels, responding to cold temperature and/or chemical agents, such as menthol or icilin, are mainly expressed in the nerve endings of the primary afferent neurons and in the cell bodies of dorsal root ganglia innervating the urinary bladder (via Aδ- and C-fibers); this suggests that TRPM8 channels primarily contribute to bladder sensory (afferent) function. Storage symptoms of overactive bladder, benign prostatic hyperplasia, and interstitial cystitis are commonly related to sensory function (bladder hypersensitivity); thus, TRPM8 channels may also contribute to the pathophysiology of bladder hypersensitivity. Indeed, it has been reported in a pharmacological investigation using rodents that TRPM8 channels contribute to the pathophysiological bladder afferent hypersensitivity of mechanosensitive C-fibers. Similar findings have also been reported in humans. Therefore, a TRPM8 antagonist would be a promising therapeutic target for bladder hypersensitive disorders, including urinary urgency or nociceptive pain. In this review article, the functional role of the TRPM8 channel in the lower urinary tract and the potential of its antagonist for the treatment of bladder disorders was described.
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Affiliation(s)
- Naoki Aizawa
- Department of Pharmacology and Toxicology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Tochigi 321-0293, Japan
| | - Tomoe Fujita
- Department of Pharmacology and Toxicology, Dokkyo Medical University, 880 Kitakobayashi, Mibu, Tochigi 321-0293, Japan
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24
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Chen P, Yang L, Tong Y, Meng L, Zhou R. The intracerebroventricular injection of lipopolysaccharide may induce neurogenic detrusor overactivity symptoms in mice. Neurourol Urodyn 2022; 41:894-904. [PMID: 35224770 DOI: 10.1002/nau.24890] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/25/2022] [Accepted: 01/29/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Pengfei Chen
- Department of Urology, Jing'an District Central Hospital Fudan University Shanghai China
| | - Lei Yang
- Department of Urology, Jing'an District Central Hospital Fudan University Shanghai China
| | - Yu Tong
- Department of Urology, Jing'an District Central Hospital Fudan University Shanghai China
| | - Li Meng
- Department of Urology, Jing'an District Central Hospital Fudan University Shanghai China
| | - Renyuan Zhou
- Department of Urology, Jing'an District Central Hospital Fudan University Shanghai China
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25
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The Translational Role of Animal Models for Estrogen-Related Functional Bladder Outlet Obstruction and Prostatic Inflammation. Vet Sci 2022; 9:vetsci9020060. [PMID: 35202312 PMCID: PMC8877003 DOI: 10.3390/vetsci9020060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/24/2022] [Accepted: 01/27/2022] [Indexed: 12/10/2022] Open
Abstract
The prevalence of LUTS and prostatic diseases increases with age both in humans and companion animals, suggesting that a common underlying cause of these conditions may be age-associated alterations in the balance of sex hormones. The symptoms are present with different and variable micturition dysfunctions and can be assigned to different clinical conditions including bladder outlet obstruction (BOO). LUTS may also be linked to chronic non-bacterial prostatitis/chronic pelvic pain syndrome (CP/CPPS), but the relationship between these conditions is unknown. This review summarizes the preclinical data that supports a role for excessive estrogen action in the development of obstructive voiding and nonbacterial prostatic inflammation. Preclinical studies that are emphasized in this review have unequivocally indicated that estrogens can induce functional and structural changes resembling those seen in human diseases. Recognizing excessive estrogen action as a possible hormonal basis for the effects observed at multiple sites in the LUT may inspire the development of innovative treatment options for human and animal patients with LUTS associated with functional BOO and CP/CPPS.
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26
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Mora AG, Andrade DR, Janussi SC, Goncalves TT, Krikorian K, Priviero FBM, Claudino MA. Tadalafil treatment improves cardiac, renal and lower urinary tract dysfunctions in rats with heart failure. Life Sci 2022; 289:120237. [PMID: 34922942 DOI: 10.1016/j.lfs.2021.120237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/09/2021] [Accepted: 12/10/2021] [Indexed: 01/25/2023]
Abstract
Tadalafil, a phosphodiesterase-5 (PDE5) inhibitor, shown to exert a protection to heart failure (HF) associated damage or lower urinary tract symptoms (LUTS). Thus, we investigated the contribution of tadalafil chronic treatment in the alterations of LUTS in HF rats. Male rats were subjected to aortocaval fistula model for HF induction. Echocardiography, cystometric, renal function and redox cell balance, as well as concentration-response curves to carbachol, KCl, ATP and frequency-response curves to electrical field stimulation (EFS) were evaluated in Sham, HF, Tadalafil and HF-Tadalafil (12 weeks endpoint) groups. HF group to present increased in left-ventricle (LV) mass and in LV end-diastolic- and LV end-systolic volume, with a decreased ejection fraction. Tadalafil treatment was able to decrease in hypertrophy and improve the LV function restoring cardiac function. For micturition function (in vivo), HF animals shown an increase in basal pressure, threshold pressure, no-voiding contractions and decreased bladder capacity, being that the tadalafil treatment restored the cystometric parameters. Contractile mechanism response (in vitro) to carbachol, KCl, ATP and EFS in the detrusor muscles (DM) were increased in the HF group, when compared to Sham group. However, tadalafil treatment restored the DM hypercontractility in the HF animals. Moreover, renal function as well as the oxidative mechanism was impaired in the HF animals, and the tadalafil treatment improved all renal and oxidative parameters in HF group. Our data shown that tadalafil has potential as multi-therapeutic drug and may be used as a pharmacological strategy for the treatment of cardiovascular, renal and urinary dysfunctions associated with HF.
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Affiliation(s)
- Aline Goncalves Mora
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | - Douglas Rafael Andrade
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | - Sabrina C Janussi
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | - Tiago Tomazini Goncalves
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | - Karla Krikorian
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | - Fernanda B M Priviero
- Cardiovascular Translational Research Center and Department of Cell Biology and Anatomy, School of Medicine, University of South Carolina, Columbia, SC, USA
| | - Mario Angelo Claudino
- Laboratory of Multidisciplinary Research, São Francisco University Medical School, Bragança Paulista, SP, Brazil.
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27
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Neri LS, de Carvalho RP, Daiuto SA, Vale BD, Cafarchio EM, Aronsson P, Sato MA. Blockade of vasopressin receptors reduces the threshold pressure of micturition reflex in female rats. Curr Res Physiol 2022; 5:399-403. [PMID: 36193514 PMCID: PMC9525731 DOI: 10.1016/j.crphys.2022.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/25/2022] [Accepted: 09/20/2022] [Indexed: 11/30/2022] Open
Abstract
The mechanisms involved in urinary bladder control are not fully understood, but it is well accepted that a complex central network is involved in micturition control. The micturition reflex can be modulated by direct cortical influence through facilitatory and inhibitory mechanisms. In addition, humoral mechanisms are involved in the bladder control. Vasopressin increases bladder contraction and intravesical pressure. This study sought to investigate the effect of intravenous injections of vasopressin receptor antagonists on cystometric parameters in anesthetized female rats. Isoflurane anesthetized adult female Wistar rats underwent femoral artery and vein cannulation for arterial pressure (AP) and heart rate (HR) recordings, and infusion of drugs, respectively. The bladder was also cannulated for intravesical pressure (IP) recordings and infusion of saline (10 mL/h) for cystometric evaluation. After baseline AP, HR and IP recordings, saline (vehicle, 1 mL/kg), V1a (5 μg/kg) or V2 receptor antagonist (5 μg/kg) was injected i.v. and after 25 min the cystometry was carried out. Neither saline nor V1a or V2 receptor blockade evoked any change in AP, HR and IP. Nevertheless, during cystometry, the threshold pressure of the micturition reflex was significantly reduced in rats with V1a (to 19.30 ± 2.39 mmHg) and V2 receptor blockade (to 19.88 ± 2.49 mmHg) compared to the saline group (28.85 ± 2.06 mmHg, p = 0.014). No difference was observed in the other cystometric parameters. Therefore, the data suggest that blockade of V1a and V2 receptors reduces the threshold pressure of the micturition reflex and does not influence other cystometric parameters in anesthetized female Wistar rats. Micturition reflex threshold is reduced by blockade of vasopressin receptors. Blockade of V1a/V2 receptors does not affect maximum pressure of micturition. Basal intravesical pressure is unaltered by low dose of V1a/V2 receptor blocker.
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28
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Qureshi F, Kung P, Hou W, Collins WF, Sisto SA. Serial transurethral cystometry: A novel method for longitudinal evaluation of reflex lower urinary tract function in adult female rats. Physiol Rep 2022; 10:e15131. [PMID: 34981663 PMCID: PMC8724781 DOI: 10.14814/phy2.15131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 11/11/2021] [Accepted: 11/14/2021] [Indexed: 06/14/2023] Open
Abstract
AIMS The aim of the study is to develop a minimally invasive method for longitudinal evaluation of lower urinary tract function that allows for simultaneous measurements of bladder pressure and external urethral sphincter (EUS) electromyographic (EMG) activity. METHODS To evaluate the reliability of serial transurethral cystometry (STUC), rats (n = 12) underwent three sessions of STUC, one session a week for 3 weeks. During each session, rats were anesthetized with ketamine-xylazine (90 mg/kg and 10 mg/kg), and micturition reflex data were acquired using transurethral cystometry and percutaneous recording of EUS (EMG) activity during continuous infusion of saline into the bladder. The reliability and consistency of the STUC method were assessed using intra-class correlation (ICC) analysis and repeated measures ANOVA. RESULTS ICC values calculated from five successive events during the first micturition session indicate good to excellent reliability for measurements of peak bladder pressure, threshold bladder pressure, minimum bladder pressure, volume threshold, duration of EUS bursting, and number of EUS burst events. Across the three recording sessions no significant difference was observed in peak bladder pressure, threshold bladder pressure, minimum bladder pressure, volume threshold, number of EUS burst events, and duration of EUS bursting using repeated measures ANOVA. CONCLUSION Serial transurethral cystometry under ketamine-xylazine anesthesia with simultaneous percutaneous EUS EMG recording is a novel, reliable, accurate, and minimally invasive method for quantitative assessment of lower urinary tract (LUT) function in adult female rats over extended periods of time.
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Affiliation(s)
- Faiza Qureshi
- Health and Rehabilitation SciencesSchool of Health Technology & ManagementStony Brook UniversityStony BrookNew YorkUSA
- Present address:
Department of AnesthesiologyStony Brook UniversityStony BrookNew YorkUSA
| | | | - Wei Hou
- Department of FamilyPopulation & Preventive MedicineStony Brook MedicineStony BrookNew YorkUSA
| | - William F. Collins
- Department of Neurobiology and BehaviorStony Brook UniversityStony BrookNew YorkUSA
| | - Sue Ann Sisto
- Department of Rehabilitation ScienceSchool of Public Health and Health ProfessionsUniversity at BuffaloBuffaloNew YorkUSA
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29
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Vanneste M, Mulier M, Nogueira Freitas AC, Van Ranst N, Kerstens A, Voets T, Everaerts W. TRPM3 Is Expressed in Afferent Bladder Neurons and Is Upregulated during Bladder Inflammation. Int J Mol Sci 2021; 23:ijms23010107. [PMID: 35008533 PMCID: PMC8745475 DOI: 10.3390/ijms23010107] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 02/06/2023] Open
Abstract
The cation channel TRPM3 is activated by heat and the neurosteroid pregnenolone sulfate. TRPM3 is expressed on sensory neurons innervating the skin, where together with TRPV1 and TRPA1, it functions as one of three redundant sensors of acute heat. Moreover, functional upregulation of TRPM3 during inflammation contributes to heat hyperalgesia. The role of TRPM3 in sensory neurons innervating internal organs such as the bladder is currently unclear. Here, using retrograde labeling and single-molecule fluorescent RNA in situ hybridization, we demonstrate expression of mRNA encoding TRPM3 in a large subset of dorsal root ganglion (DRG) neurons innervating the mouse bladder, and confirm TRPM3 channel functionality in these neurons using Fura-2-based calcium imaging. After induction of cystitis by injection of cyclophosphamide, we observed a robust increase of the functional responses to agonists of TRPM3, TRPV1, and TRPA1 in bladder-innervating DRG neurons. Cystometry and voided spot analysis in control and cyclophosphamide-treated animals did not reveal differences between wild type and TRPM3-deficient mice, indicating that TRPM3 is not critical for normal voiding. We conclude that TRPM3 is functionally expressed in a large proportion of sensory bladder afferent, but its role in bladder sensation remains to be established.
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Affiliation(s)
- Matthias Vanneste
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Center for Brain & Disease Research, Belgium & Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium; (M.V.); (M.M.); (A.C.N.F.); (N.V.R.)
| | - Marie Mulier
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Center for Brain & Disease Research, Belgium & Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium; (M.V.); (M.M.); (A.C.N.F.); (N.V.R.)
| | - Ana Cristina Nogueira Freitas
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Center for Brain & Disease Research, Belgium & Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium; (M.V.); (M.M.); (A.C.N.F.); (N.V.R.)
| | - Nele Van Ranst
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Center for Brain & Disease Research, Belgium & Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium; (M.V.); (M.M.); (A.C.N.F.); (N.V.R.)
| | - Axelle Kerstens
- VIB Bio Imaging Core, VIB-KU Leuven Center for Brain & Disease Research, Belgium & Research Group Molecular Neurobiology, Department of Neuroscience, KU Leuven, 3000 Leuven, Belgium;
| | - Thomas Voets
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Center for Brain & Disease Research, Belgium & Department of Cellular and Molecular Medicine, KU Leuven, 3000 Leuven, Belgium; (M.V.); (M.M.); (A.C.N.F.); (N.V.R.)
- Correspondence: ; Tel.: +32-16-33-02-17
| | - Wouter Everaerts
- Laboratory of Organ Systems, Department of Development and Regeneration, KU Leuven, Belgium & Department of Urology, University Hospitals Leuven, 3000 Leuven, Belgium;
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Change in the central control of the bladder function of rats with focal cerebral infarction induced by photochemically-induced thrombosis. PLoS One 2021; 16:e0255200. [PMID: 34752461 PMCID: PMC8577768 DOI: 10.1371/journal.pone.0255200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 10/15/2021] [Indexed: 11/19/2022] Open
Abstract
The photochemically-induced thrombosis (photothrombosis) method can create focal cerebral infarcts anywhere in the relatively superficial layers of the cerebrum; it is easy to implement and minimally invasive. Taking advantage of this versatility, we aimed to establish a new rat model of urinary frequency with focal cerebral infarction, which was characterized by its simplicity, nonlethal nature, and high reproducibility. The prefrontal cortex and the anterior cingulate cortex, which are involved in lower urinary tract control, were targeted for focal cerebral infarction, and urinary parameters were measured by cystometrogram. Cystometric analysis indicated that micturition intervals significantly shortened in photothrombosis-treated rats compared with those in the sham operative group on Days 1 and 7 (P < 0.01), but prolonged after 14 days, with no difference between the two groups. Immunopathological evaluation showed an accumulation of activated microglia, followed by an increase in reactive astrocytes at the peri-infarct zone after photothrombotic stroke. Throughout this study, all postphotothrombosis rats showed cerebral infarction in the prefrontal cortex and anterior cingulate cortex; there were no cases of rats with fatal cerebral infarction. This model corresponded to the clinical presentation, in that the micturition status changed after stroke. In conclusion, this novel model combining nonlethality and high reproducibility may be a suitable model of urinary frequency after focal cerebral infarction.
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31
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Metformin abrogates the voiding dysfunction induced by prolonged methylglyoxal intake. Eur J Pharmacol 2021; 910:174502. [PMID: 34516950 DOI: 10.1016/j.ejphar.2021.174502] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/14/2021] [Accepted: 09/09/2021] [Indexed: 12/17/2022]
Abstract
Methylglyoxal (MGO) is a reactive carbonyl species found at high levels in blood of diabetic patients. The anti-hyperglycemic drug metformin can scavenger MGO and reduce the formation of advanced glycation end products (AGEs). Here, we aimed to investigate if MGO-induced bladder dysfunction can be reversed by metformin. Male C57/BL6 mice received 0.5% MGO in drinking water for 12 weeks, and metformin (300 mg/kg, daily gavage) was given in the last two weeks. The bladder functions were evaluated by performing voiding behavior assays, cystometry and in vitro bladder contractions. MGO intake markedly elevated the levels of MGO and fluorescent AGEs in serum and reduced the mRNA expression and activity of glyoxalase (Glo1) in bladder tissues. Glucose levels were unaffected among groups. MGO intake also increased the urothelium thickness and collagen content of the bladder. Void spot assays in conscious mice revealed an increased void volume in MGO group. The cystometric assays in anesthetized mice revealed increases of basal pressure, non-voiding contractions frequency, bladder capacity, inter-micturition pressure and residual volume, which were accompanied by reduced voiding efficiency in MGO group. In vitro bladder contractions to carbachol, α,β-methylene ATP and electrical-field stimulation were significantly greater in MGO group. Metformin normalized the changes of MGO and AGEs levels, Glo1 expression and activity, urothelium thickness and collagen content. The MGO-induced voiding dysfunction were all restored by metformin treatment. Our findings strongly suggest that the amelioration of MGO-induced voiding dysfunction by metformin relies on its ability to scavenger MGO, preventing its accumulation in blood.
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32
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Sultana S, Berger G, Cox A, Kelly MEM, Lehmann C. Rodent models of ketamine-induced cystitis. Neurourol Urodyn 2021; 40:1704-1719. [PMID: 34350618 DOI: 10.1002/nau.24763] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/25/2021] [Accepted: 07/19/2021] [Indexed: 02/03/2023]
Abstract
AIMS Long-term or recreational use of ketamine affects the urinary system and can result in ketamine-induced cystitis (KIC). Rodent models of KIC are important to study KIC pathophysiology and are paramount to the future development of therapies for this painful condition. This review aims to provide a summary of rodent models of KIC, focusing on disease induction, experimental methods, and pathological features of the model. METHOD A literature search was performed using the National Center for Biotechnology Information (NCBI) Pubmed database up to March 2021. 20 articles met the inclusion criteria and were finally selected. RESULTS There are considerable variations in the rodent models used for studying KIC in terms of the strain of the animal being used; dose, duration, and route of ketamine administration to induce KIC, and assessment of pathological features. CONCLUSION KIC remains difficult to fully recapitulate in humans. Improved characterization of KIC models and the experimental parameters and meticulous discussion on translational limitations are required to improve the translational value of research using rodent models of KIC.
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Affiliation(s)
- Saki Sultana
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Geraint Berger
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Ashley Cox
- Department of Urology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Melanie E M Kelly
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Ophthalmology & Visual Sciences, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Anesthesia, Pain Management & Perioperative Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Christian Lehmann
- Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Anesthesia, Pain Management & Perioperative Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Physiology and Biophysics, Dalhousie University, Halifax, Nova Scotia, Canada
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Franken J, De Bruyn H, Rietjens R, Segal A, De Ridder D, Everaerts W, Voets T, Vande Velde G. X-ray videocystometry for high-speed monitoring of urinary tract function in mice. SCIENCE ADVANCES 2021; 7:7/30/eabi6821. [PMID: 34301607 PMCID: PMC8302127 DOI: 10.1126/sciadv.abi6821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 06/08/2021] [Indexed: 06/13/2023]
Abstract
Lower urinary tract dysfunction (LUTd) represents a major health care problem with a high, unmet medical need. Design of additional therapies for LUTd requires precise tools to study bladder storage and voiding (dys)function in animal models. We developed videocystometry in mice, combining intravesical pressure measurements with high-speed fluoroscopy of the urinary tract. Videocystometry substantially outperforms current state-of-the-art methods to monitor the urine storage and voiding process, by enabling quantitative analysis of voiding efficiency, urethral flow, vesicoureteral reflux, and the relation between intravesical pressure and flow, in both anesthetized and awake, nonrestrained mice. Using videocystometry, we identified localized bladder wall micromotions correlated with different states of the filling/voiding cycle, revealed an acute effect of TRPV1 channel activation on voiding efficiency, and pinpointed the effects of urethane anesthesia on urine storage and urethral flow. Videocystometry has broad applications, ranging from the elucidation of molecular mechanisms of bladder control to drug development for LUTd.
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Affiliation(s)
- Jan Franken
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Centre for Brain and Disease Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Helene De Bruyn
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Centre for Brain and Disease Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Roma Rietjens
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Centre for Brain and Disease Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Andrei Segal
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Centre for Brain and Disease Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Dirk De Ridder
- Laboratory of Organ System, Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | - Wouter Everaerts
- Laboratory of Organ System, Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | - Thomas Voets
- Laboratory of Ion Channel Research (LICR), VIB-KU Leuven Centre for Brain and Disease Research, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.
| | - Greetje Vande Velde
- Biomedical MRI, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
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Amend B, Harland N, Knoll J, Stenzl A, Aicher WK. Large Animal Models for Investigating Cell Therapies of Stress Urinary Incontinence. Int J Mol Sci 2021; 22:ijms22116092. [PMID: 34198749 PMCID: PMC8201285 DOI: 10.3390/ijms22116092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/28/2021] [Accepted: 05/31/2021] [Indexed: 12/12/2022] Open
Abstract
Stress urinary incontinence (SUI) is a significant health concern for patients affected, impacting their quality of life severely. To investigate mechanisms contributing to SUI different animal models were developed. Incontinence was induced under defined conditions to explore the pathomechanisms involved, spontaneous recovery, or efficacy of therapies over time. The animal models were coined to mimic known SUI risk factors such as childbirth or surgical injury. However, animal models neither reflect the human situation completely nor the multiple mechanisms that ultimately contribute to the pathogenesis of SUI. In the past, most SUI animal studies took advantage of rodents or rabbits. Recent models present for instance transgenic rats developing severe obesity, to investigate metabolic interrelations between the disorder and incontinence. Using recombinant gene technologies, such as transgenic, gene knock-out or CRISPR-Cas animals may narrow the gap between the model and the clinical situation of patients. However, to investigate surgical regimens or cell therapies to improve or even cure SUI, large animal models such as pig, goat, dog and others provide several advantages. Among them, standard surgical instruments can be employed for minimally invasive transurethral diagnoses and therapies. We, therefore, focus in this review on large animal models of SUI.
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Affiliation(s)
- Bastian Amend
- Department of Urology, University of Tuebingen Hospital, 72076 Tuebingen, Germany; (B.A.); (N.H.); (A.S.)
| | - Niklas Harland
- Department of Urology, University of Tuebingen Hospital, 72076 Tuebingen, Germany; (B.A.); (N.H.); (A.S.)
| | - Jasmin Knoll
- Center of Medical Research, Department of Urology at UKT, Eberhard-Karls-University, 72076 Tuebingen, Germany;
| | - Arnulf Stenzl
- Department of Urology, University of Tuebingen Hospital, 72076 Tuebingen, Germany; (B.A.); (N.H.); (A.S.)
| | - Wilhelm K. Aicher
- Center of Medical Research, Department of Urology at UKT, Eberhard-Karls-University, 72076 Tuebingen, Germany;
- Correspondence:
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Neurophysiological control of urinary bladder storage and voiding-functional changes through development and pathology. Pediatr Nephrol 2021; 36:1041-1052. [PMID: 32415328 DOI: 10.1007/s00467-020-04594-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 04/24/2020] [Accepted: 04/28/2020] [Indexed: 10/24/2022]
Abstract
The effective storage of urine and its expulsion relies upon the coordinated activity of parasympathetic, sympathetic, and somatic innervations to the lower urinary tract (LUT). At birth, all mammalian neonates lack the ability to voluntary regulate bladder storage or voiding. The ability to control urinary bladder activity is established as connections to the central nervous system (CNS) form through development. The neural regulation of the LUT has been predominantly investigated in adult animal models where comparatively less is known about the neonatal and postnatal neurophysiological development that facilitate urinary continence. Furthermore, congenital neurological or anatomical defects can adversely affect both storage and voiding functions through postnatal development and into adulthood, leading to secondary conditions including vesicoureteral reflux, chronic urinary tract infections, and end-stage renal disease. Therefore, the aim of the review is to provide the current knowledge available on neurophysiological regulation of the LUT through pre- to postnatal development of human and animal models and the consequences of congenital anomalies that can affect LUT neural function.
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Cao T, Xie B, Yang S, Wang J, Yang X, Shen B, Lin X, Sun X, Wang J. Low-Frequency Intravesical Electrical Stimulation for the Treatment of Acute Urinary Retention: A Promising Therapeutic Approach. Front Med (Lausanne) 2021; 8:572846. [PMID: 33763432 PMCID: PMC7982863 DOI: 10.3389/fmed.2021.572846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 01/28/2021] [Indexed: 01/25/2023] Open
Abstract
Acute urinary retention (AUR) is a troublesome urological disease, which causes various lower urinary tract symptoms. However, only few studies explored and evaluated the effective treatments to improve AUR. We aimed to find an effective approach to cure AUR through comparing the efficacy of existing classical low-frequency transcutaneous electrical nerve stimulation (TENS) and novel intravesical electrical stimulation (IVES). A total of 24 AUR female rats were divided into 3 groups as follows: control, TENS, and IVES groups. Rats in the control group had no fake stimulation. Rats in the TENS and IVES groups underwent transcutaneous or intravesical stimulation of a symmetrical biphasic rectangular current pulse with a frequency of 35 Hz, 30 min per day, for seven consecutive days. IVES significantly reduced the actin expression in the submucosal layer but increased its expression in the detrusor layer (p = 0.035, p = 0.001). The neovascularization in the submucosal layer in the IVES group was significantly increased than in the other 2 groups (p = 0.006). Low-frequency IVES performed better than TENS in terms of simultaneously relieving bladder hyperactivity, accelerating epithelial recovery, and strengthening detrusor muscle. IVES may be a promising therapeutic approach for bladder dysfunction, specifically for AUR and overactive bladder in clinical practice.
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Affiliation(s)
- Tingting Cao
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China.,The Key Laboratory of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China.,The Research Center of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China
| | - Bing Xie
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China.,The Key Laboratory of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China.,The Research Center of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China
| | - Siyuan Yang
- Department of Hematology and Lymphoma Research Center, Peking University Third Hospital, Beijing, China
| | - Jiaqi Wang
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China.,The Key Laboratory of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China.,The Research Center of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China
| | - Xiao Yang
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China
| | - Boqiang Shen
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China
| | - Xueke Lin
- Department of Obstetrics and Gynecology, Quanzhou First Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Xiuli Sun
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China.,The Key Laboratory of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China.,The Research Center of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China
| | - Jianliu Wang
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing, China.,The Key Laboratory of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China.,The Research Center of Female Pelvic Floor Disorders Disease of Peking University, Beijing, China
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Wróbel A, Serefko A, Szopa A, Poleszak E. Asiatic Acid, a Natural Compound that Exerts Beneficial Effects on the Cystometric and Biochemical Parameters in the Retinyl Acetate-Induced Model of Detrusor Overactivity. Front Pharmacol 2021; 11:574108. [PMID: 33584259 PMCID: PMC7878531 DOI: 10.3389/fphar.2020.574108] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 12/17/2020] [Indexed: 12/18/2022] Open
Abstract
Scientists have been constantly looking for new synthetic and natural compounds that could have beneficial effects in bladder overactivity. Our attention was drawn by asiatic acid that influences a number of molecules and signaling pathways relevant for the proper functioning of the urinary tracts in humans. In the present project we wanted to check whether asiatic acid would have positive effects in the confirmed animal model of detrusor overactivity (DO) and whether it would affect the bladder blood flow, urothelium thickness, inflammatory and oxidative stress markers, neurotrophic and growth factors, and other parameters important for the activity of the urinary bladder. The outcomes of our study showed that a 14-day administration of asiatic acid (30 mg/kg/day) by oral gavage normalizes the cystometric parameters corresponding to DO and reduces the accompanying oxidative stress (measured by the levels of malondialdehyde-61,344 ± 24,908 pg/ml vs. 33,668 ± 5,071 pg/ml, 3-nitrotyrosine-64,615 ± 25,433 pg/ml vs. 6,563 ± 1,736 pg/ml, and NOS2-2,506 ± 411.7 vs. 3,824 ± 470.1 pg/ml). Moreover, it decreases the urinary secretion of neurotrophins (BDNF-304.4 ± 33.21 pg/ml vs. 119.3 ± 11.49 pg/ml and NGF-205.5 ± 18.50 vs. 109.7 ± 15.94 pg/ml) and prevents the changes in a range of biomarkers indicating the dysfunction of the urinary bladder, CGRP (421.1 ± 56.64 vs. 108.1 ± 11.73 pg/ml), E-Cadherin (773.5 ± 177.5 pg/ml vs. 1,560 ± 154.5 pg/ml), OCT3 (3,943 ± 814.6 vs. 1,018 ± 97.07 pg/ml), SNAP-23 (6,763 ± 808.9 pg/ml vs. 3,455 ± 554.5 pg/ml), SNAP-25 (2,038 ± 162.7 pg/ml vs. 833.3 ± 65.48), substance P (171.7 ± 16.86 pg/ml vs. 65.07 ± 8.250 pg/ml), SV2A (1,927 ± 175.3 pg/ml vs. 1,154 ± 254.9 pg/ml), tight junction protein 1 (360.1 ± 95.05 pg/ml vs. 563.4 ± 65.43 pg/ml), VAChT (16,470 ± 2,419 pg/ml vs. 7,072 ± 1,339 pg/ml), VEGFA (318.3 ± 37.89 pg/ml vs. 201.5 ± 22.91 pg/ml). The mentioned parameters are associated with smooth muscle contractions, urothelial barrier, transportation and release of transmitters, or bladder compensation. Thus, the presented findings allow to suggest a possible future role of asiatic acid in the prevention of conditions accompanied by DO, such as overactive bladder.
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Affiliation(s)
- Andrzej Wróbel
- Second Department of Gynecology, Medical University of Lublin, Lublin, Poland
| | - Anna Serefko
- Chair and Department of Applied and Social Pharmacy, Laboratory of Preclinical Testing, Medical University of Lublin, Lublin, Poland
| | - Aleksandra Szopa
- Chair and Department of Applied and Social Pharmacy, Laboratory of Preclinical Testing, Medical University of Lublin, Lublin, Poland
| | - Ewa Poleszak
- Chair and Department of Applied and Social Pharmacy, Laboratory of Preclinical Testing, Medical University of Lublin, Lublin, Poland
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Maeda K, Hotta Y, Shibayama M, Kawata R, Kataoka T, Matsumoto S, Yamamoto T, Kimura K. Impairment of accessory nerves around major pelvic ganglion leading to overflow urinary incontinence in rats. Neurourol Urodyn 2021; 40:624-631. [PMID: 33492702 DOI: 10.1002/nau.24612] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/08/2020] [Accepted: 01/04/2021] [Indexed: 12/13/2022]
Abstract
AIMS To investigate the relationship between lower urinary tract function and the accessory nerve (ACN) arising from the major pelvic ganglion (MPG). METHODS Ten-week-old male Wistar/ST rats were randomly divided into eight groups according to the type of treatment (sham or bilateral accessory nerve injury [BACNI]) and the duration of observation (3 days, 1 week, 2 weeks, or 4 weeks: Sham-3d, Sham-1w, Sham-2w, Sham-4w, BACNI-3d, BACNI-1w, BACNI-2ws, and BACNI-4w. BACNI was induced in the following manner: the ACN was crushed for 1 min (2 mm away from the MPG) using reverse-action tweezers. The same procedure was performed on both sides. On the last day of each observation period, the bladder function was measured by awake cystometry, and histological evaluation was performed. RESULTS All rats in the Sham groups micturated normally. In the BACNI-3d and BACNI-1w groups, all rats showed symptoms of overflow urinary incontinence (OUI). This OUI improved gradually over time. The bladder's size in the BACNI group was significantly larger than that in the Sham group (p < .01). In addition, fibrosis was observed in the subserosa of the bladder of rats in BACNI groups. CONCLUSION The BACNI model rats exhibited OUI, suggesting that ACN is involved in the lower urinary tract function. It might be possible that ACN controls the function of either the bladder, the urethra, or both.
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Affiliation(s)
- Kotomi Maeda
- Department of Hospital Pharmacy, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan
| | - Yuji Hotta
- Department of Hospital Pharmacy, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan
| | - Maaya Shibayama
- Department of Hospital Pharmacy, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan
| | - Ryoya Kawata
- Department of Hospital Pharmacy, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan
| | - Tomoya Kataoka
- Department of Clinical Pharmaceutics, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Seiji Matsumoto
- Center for Advanced Research and Education, Asahikawa Medical University, Asahikawa, Japan.,Clinical Research Support Center, Asahikawa Medical University Hospital, Asahikawa, Japan
| | - Tokunori Yamamoto
- Clinical Research Support Center, Asahikawa Medical University Hospital, Asahikawa, Japan.,Laboratory for Clinical Application of Adipose-Derived Regenerative Cells, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazunori Kimura
- Department of Hospital Pharmacy, Nagoya City University Graduate School of Pharmaceutical Sciences, Nagoya, Japan.,Department of Clinical Pharmaceutics, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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Medina‐Aguinaga D, Hoey RF, Munoz A, Altamira‐Camacho M, Quintanar JL, Hubscher CH. Choice of cystometric technique impacts detrusor contractile dynamics in wistar rats. Physiol Rep 2021; 9:e14724. [PMID: 33463913 PMCID: PMC7814486 DOI: 10.14814/phy2.14724] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/15/2020] [Accepted: 12/22/2020] [Indexed: 11/24/2022] Open
Abstract
The objective of the current animal study was to investigate factors contributing to the different phases of the cystometrogram (CMG) in order to address disparities in research data reported in the current literature. Three experiments in 20 female Wistar rats were designed to investigate (1) the effects of anesthesia on the contractile pattern of the bladder during micturition; (2) the impact of the physical characteristics of the CMG technique upon the accuracy of intra-vesical pressure recordings; and (3) identification of physiological and methodological factors associated with the emptying and rebound phases during CMG. Variables tested included awake versus urethane-anesthetized conditions, use of a single catheter for both filling and intra-vesical pressure (Pves) recording versus a separate two catheter approach, and comparisons between ureter, bladder dome, and urethral catheter placements. Both awake and anesthetized conditions contributed to variations in the shape and magnitude of the CMG pressure curves. In addition, catheter size, acute incision of the bladder dome for catheter placement, use of the same catheter for filling and Pves recordings, as well as the placement and positioning of the tubing, all contributed to alterations of the physiological properties and characteristic of the various CMG phases, including the frequent occurrence of an artificial rebound during the third phase of micturition. The present results demonstrate how different experimental conditions lead not only to variability in Pves curves, but consistency of the measurements as well, which needs to be accounted for when interpreting CMG outcome data.
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Affiliation(s)
- Daniel Medina‐Aguinaga
- Department of Anatomical Sciences & NeurobiologyUniversity of LouisvilleLouisvilleKYUSA
- Department of Physiology & PharmacologyUAAAguascalientesMexico
| | - Robert F. Hoey
- Department of Anatomical Sciences & NeurobiologyUniversity of LouisvilleLouisvilleKYUSA
| | - Alvaro Munoz
- Department of Foundations of KnowledgeCentro Universitario del NorteUniversity of GuadalajaraColotlanMexico
| | | | | | - Charles H. Hubscher
- Department of Anatomical Sciences & NeurobiologyUniversity of LouisvilleLouisvilleKYUSA
- Kentucky Spinal Cord Research CenterLouisvilleKYUSA
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Payne SC, Wiedmann NM, Eiber CD, Wong AW, Senn P, Osborne PB, Keast JR, Fallon JB. Recording of Electrically Evoked Neural Activity and Bladder Pressure Responses in Awake Rats Chronically Implanted With a Pelvic Nerve Array. Front Neurosci 2020; 14:619275. [PMID: 33390899 PMCID: PMC7773906 DOI: 10.3389/fnins.2020.619275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 11/25/2020] [Indexed: 01/16/2023] Open
Abstract
Bioelectronic medical devices are well established and widely used in the treatment of urological dysfunction. Approved targets include the sacral S3 spinal root and posterior tibial nerve, but an alternate target is the group of pelvic splanchnic nerves, as these contain sacral visceral sensory and autonomic motor pathways that coordinate storage and voiding functions of the bladder. Here, we developed a device suitable for long-term use in an awake rat model to study electrical neuromodulation of the pelvic nerve (homolog of the human pelvic splanchnic nerves). In male Sprague-Dawley rats, custom planar four-electrode arrays were implanted over the distal end of the pelvic nerve, close to the major pelvic ganglion. Electrically evoked compound action potentials (ECAPs) were reliably detected under anesthesia and in chronically implanted, awake rats up to 8 weeks post-surgery. ECAP waveforms showed three peaks, with latencies that suggested electrical stimulation activated several subpopulations of myelinated A-fiber and unmyelinated C-fiber axons. Chronic implantation of the array did not impact on voiding evoked in awake rats by continuous cystometry, where void parameters were comparable to those published in naïve rats. Electrical stimulation with chronically implanted arrays also induced two classes of bladder pressure responses detected by continuous flow cystometry in awake rats: voiding contractions and non-voiding contractions. No evidence of tissue pathology produced by chronically implanted arrays was detected by immunohistochemical visualization of markers for neuronal injury or noxious spinal cord activation. These results demonstrate a rat pelvic nerve electrode array that can be used for preclinical development of closed loop neuromodulation devices targeting the pelvic nerve as a therapy for neuro-urological dysfunction.
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Affiliation(s)
- Sophie C Payne
- Bionics Institute, Fitzroy, VIC, Australia.,Medical Bionics Department, University of Melbourne, Melbourne, VIC, Australia
| | - Nicole M Wiedmann
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia
| | - Calvin D Eiber
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia
| | - Agnes W Wong
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia
| | - Philipp Senn
- Bionics Institute, Fitzroy, VIC, Australia.,Medical Bionics Department, University of Melbourne, Melbourne, VIC, Australia
| | - Peregrine B Osborne
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia
| | - Janet R Keast
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, VIC, Australia
| | - James B Fallon
- Bionics Institute, Fitzroy, VIC, Australia.,Medical Bionics Department, University of Melbourne, Melbourne, VIC, Australia.,Department of Otolaryngology, University of Melbourne, Melbourne, VIC, Australia
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Wang J, Wu J, Moris D, Hayes B, Abraham SN, Cendales LC. Introducing a novel experimental model of bladder transplantation in mice. Am J Transplant 2020; 20:3558-3566. [PMID: 32282990 PMCID: PMC11197928 DOI: 10.1111/ajt.15912] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 03/24/2020] [Accepted: 03/31/2020] [Indexed: 01/25/2023]
Abstract
Bladder dysfunction is a common clinical problem attributed to various conditions such as posterior urethral valves, neurogenic bladder, ureteral ectopy, or bladder exstrophy. Currently, the main therapeutic option for these dysfunctions is neobladder reconstruction with gastrointestinal tract segments. However, the latter was associated with significant long-term complications. To provide a new candidate of possible surgical solution for bladder dysfunction, we propose a novel orthotropic mouse bladder transplantation model. The donor bladder with abdominal aorta and inferior vena cava was isolated and orthotopically sutured to the recipient, whose bladder above the ureteral opening level was removed. The recipient mice showed more than 80% 6-month survival rate and comparable body weight to control mice. At both 1 month and 6 months posttransplant, the urine voiding behavior of recipient mice and control mice was monitored by cystometry. We found that the recipient mice displayed similar bladder pressure and urine secretion ability compared to control mice especially at 6 months posttransplant. Similarity of bladder structure between recipient and control mice was confirmed by histology. As a proof of principle, we tested our model in an allogeneic setting. Early acute rejection was noted after day 5 that was histologically more profound by day 10 posttransplant. These results indicate that the mouse bladder transplant is able to provide normal bladder function.
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Affiliation(s)
- Jun Wang
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina
| | - Jianxuan Wu
- Department of Immunology, Duke University School of Medicine, Durham, North Carolina
| | - Dimitrios Moris
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina
| | - Byron Hayes
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina
| | - Soman N. Abraham
- Department of Immunology, Duke University School of Medicine, Durham, North Carolina
- Department of Pathology, Duke University School of Medicine, Durham, North Carolina
- Department of Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina
| | - Linda C. Cendales
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina
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The intracellular Ca 2+ release channel TRPML1 regulates lower urinary tract smooth muscle contractility. Proc Natl Acad Sci U S A 2020; 117:30775-30786. [PMID: 33199609 PMCID: PMC7720193 DOI: 10.1073/pnas.2016959117] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
TRPML1 (transient receptor potential mucolipin 1) is a Ca2+-permeable, nonselective cation channel that is localized to late endosomes and lysosomes. Here, we investigated the function of TRPML1 channels in regulating lower urinary tract (LUT) smooth muscle cell (SMC) contractility. We found that TRPML1 forms a stable signaling complex with ryanodine receptors (RyRs) in the sarcoplasmic reticulum (SR). We further showed that TRPML1 channels are important for initiating an essential Ca2+-signaling negative feedback mechanism between RyRs on SR membranes and K+ channels on the plasma membrane. Knockout of TRPML1 channels in mice impaired this pathway, resulting in LUT smooth muscle hypercontractility and symptoms of overactive bladder. Our findings demonstrate a critical role for TRPML1 in LUT function. TRPML1 (transient receptor potential mucolipin 1) is a Ca2+-permeable, nonselective cation channel that is predominantly localized to the membranes of late endosomes and lysosomes (LELs). Intracellular release of Ca2+ through TRPML1 is thought to be pivotal for maintenance of intravesicular acidic pH as well as the maturation, fusion, and trafficking of LELs. Interestingly, genetic ablation of TRPML1 in mice (Mcoln1−/−) induces a hyperdistended/hypertrophic bladder phenotype. Here, we investigated this phenomenon further by exploring an unconventional role for TRPML1 channels in the regulation of Ca2+-signaling activity and contractility in bladder and urethral smooth muscle cells (SMCs). Four-dimensional (4D) lattice light-sheet live-cell imaging showed that the majority of LELs in freshly isolated bladder SMCs were essentially immobile. Superresolution microscopy revealed distinct nanoscale colocalization of LEL-expressing TRPML1 channels with ryanodine type 2 receptors (RyR2) in bladder SMCs. Spontaneous intracellular release of Ca2+ from the sarcoplasmic reticulum (SR) through RyR2 generates localized elevations of Ca2+ (“Ca2+ sparks”) that activate plasmalemmal large-conductance Ca2+-activated K+ (BK) channels, a critical negative feedback mechanism that regulates smooth muscle contractility. This mechanism was impaired in Mcoln1−/− mice, which showed diminished spontaneous Ca2+ sparks and BK channel activity in bladder and urethra SMCs. Additionally, ex vivo contractility experiments showed that loss of Ca2+ spark–BK channel signaling in Mcoln1−/− mice rendered both bladder and urethra smooth muscle hypercontractile. Voiding activity analyses revealed bladder overactivity in Mcoln1−/− mice. We conclude that TRPML1 is critically important for Ca2+ spark signaling, and thus regulation of contractility and function, in lower urinary tract SMCs.
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Kamei J, Aizawa N, Nakagawa T, Kaneko S, Fujimura T, Homma Y, Kume H, Igawa Y. Lacking transient receptor potential melastatin 2 attenuates lipopolysaccharide-induced bladder inflammation and its associated hypersensitivity in mice. Int J Urol 2020; 28:107-114. [PMID: 33026125 DOI: 10.1111/iju.14389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 09/02/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To study the role of transient receptor potential melastatin 2 in bladder function and inflammation-associated hypersensitivity. METHODS We evaluated physiological function of the bladder and intravesical lipopolysaccharide-induced inflammatory nociceptive responses in female wild-type and transient receptor potential melastatin 2-knockout mice. In vivo frequency/volume and decerebrated unanesthetized cystometry measurements, as well as in vitro detrusor strip functional studies, were carried out to evaluate bladder function. Mice received intravesical lipopolysaccharide (2.0 mg/mL) or saline instillation to evaluate responses to bladder inflammation. Voiding and bladder pain-like behaviors, cystometry measurements and histological evaluation were carried out before and after intravesical lipopolysaccharide instillation. RESULTS Few phenotypic differences in in vivo and in vitro physiological function were found between the two genotypes. Comparison of measurements taken before and 24-48 h after intravesical lipopolysaccharide instillation showed that voiding parameters did not change in transient receptor potential melastatin 2-knockout mice, whereas an increased voiding frequency was observed in wild-type mice. At 24 h after intravesical lipopolysaccharide instillation, the numbers of bladder pain-like behaviors and of infiltrated inflammatory cells in the bladder submucosal layer were significantly increased, and the voided volume and the intercontraction interval were significantly decreased on cystometry measurements in wild-type mice compared with those in both transient receptor potential melastatin 2-knockout mice and in wild-type mice treated with saline instillation. CONCLUSIONS Although the physiological roles of transient receptor potential melastatin 2 channels in the bladder might be limited, inflammation and associated hypersensitivity of the bladder caused by intravesical lipopolysaccharide instillation are attenuated in transient receptor potential melastatin 2-knockout mice, suggesting pathophysiological roles of transient receptor potential melastatin 2 channels in these processes.
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Affiliation(s)
- Jun Kamei
- Department of Urology, Jichi Medical University, Tochigi, Japan.,Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Naoki Aizawa
- Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Pharmacology and Toxicology, Dokkyo Medical University, Tochigi, Japan
| | - Takayuki Nakagawa
- Clinical Pharmacology and Therapeutics, Kyoto University Hospital, Kyoto, Japan.,Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Shuji Kaneko
- Department of Molecular Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | | | - Yukio Homma
- Department of Urology, Japan Red Cross Hospital, Tokyo, Japan
| | - Haruki Kume
- Department of Urology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
| | - Yasuhiko Igawa
- Department of Continence Medicine, The University of Tokyo Graduate School of Medicine, Tokyo, Japan.,Department of Urology, Nagano Prefectural Medical Center, Suzaka, Japan
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Animal Model for Lower Urinary Tract Dysfunction in Parkinson's Disease. Int J Mol Sci 2020; 21:ijms21186520. [PMID: 32906613 PMCID: PMC7554934 DOI: 10.3390/ijms21186520] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 12/19/2022] Open
Abstract
Although Parkinson's disease (PD) is characterized by the loss of dopaminergic neurons in the substantia nigra and subsequent motor symptoms, various non-motor symptoms often precede these other symptoms. While motor symptoms are certainly burdensome, a wide range of non-motor symptoms have emerged as the key determinant of the quality of life in PD patients. The prevalence of lower urinary tract symptoms differs according to the study, with ranges between 27% and 63.9%. These can be influenced by the stage of disease, the presence of lower urinary tract-related comorbidities, and parallels with other manifestations of autonomic dysfunction. Animal models can provide a platform for investigating the mechanisms of PD-related dysfunction and for the assessment of novel treatment strategies. Animal research efforts have been primarily focused on PD motor signs and symptoms. However, the etiology of lower urinary tract dysfunction in PD has yet to be definitively clarified. Several animal PD models are available, each of which has a different effect on the autonomic nervous system. In this article, we review the various lower urinary tract dysfunction animal PD models. We additionally discuss techniques for determining the appropriate model for evaluating the development of lower urinary tract dysfunction treatments.
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Mossa AH, Galan A, Cammisotto PG, Velasquez Flores M, Shamout S, Barcelona P, Saragovi HU, Campeau L. Antagonism of proNGF or its receptor p75 NTR reverses remodelling and improves bladder function in a mouse model of diabetic voiding dysfunction. Diabetologia 2020; 63:1932-1946. [PMID: 32699962 DOI: 10.1007/s00125-020-05222-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/18/2020] [Indexed: 10/23/2022]
Abstract
AIMS/HYPOTHESIS Although 80% of diabetic patients will suffer from voiding difficulties and urinary symptoms, defined as diabetic voiding dysfunction (DVD), therapeutic targets and treatment options are limited. We hypothesise that the blockade of the pro-nerve growth factor (NGF)/p75 neurotrophin receptor (p75NTR) axis by an anti-proNGF monoclonal antibody or by a small molecule p75NTR antagonist (THX-B) can restore bladder remodelling (represented by bladder weight) in an animal model of DVD. Secondary outcomes of the study include improvements in bladder compliance, contractility and morphology, as well as in voiding behaviour, proNGF/NGF balance and TNF-α expression. METHODS In a streptozotocin-induced mouse model of diabetes, diabetic mice received either a blocking anti-proNGF monoclonal antibody or a p75NTR antagonist small molecule as weekly systemic injections for 4 weeks. Animals were tested at baseline (at 2 weeks of diabetes induction), and after 2 and 4 weeks of treatment. Outcomes measured were voiding function with voiding spot assays and cystometry. Bladders were assessed by histological, contractility and protein expression assays. RESULTS Diabetic mice showed features of DVD as early as 2 weeks after diabetes diagnosis (baseline) presented by hypertrophy, reduced contractility and abnormal cystometric parameters. Following treatment initiation, a twofold increase (p < 0.05) in untreated diabetic mouse bladder weight and thickness compared with non-diabetic controls was observed, and this change was reversed by p75NTR antagonism (37% reduction in bladder weight compared with untreated diabetic mice [95% CI 14%, 60%]) after 4 weeks of treatment. However, blocking proNGF did not help to reverse bladder hypertrophy. While diabetic mice had significantly worse cystometric parameters and contractile responses than non-diabetic controls, proNGF antagonism normalised bladder compliance (0.007 [Q1-Q3; 0.006-0.009] vs 0.015 [Q1-Q3; 0.014-0.029] ml/cmH2O in untreated diabetic mice, representing 62% reduction [95% CI 8%, 110%], p < 0.05) and contractility to KCl, carbachol and electrical field stimulation (p < 0.05 compared with the diabetic group) after 2 weeks of treatment. These effects were not observed after 4 weeks of treatment with proNGF antagonist. p75NTR antagonism did not show important improvements in cystometric parameters after 2 weeks of treatment. Slightly improved bladder compliance (0.01 [Q1-Q3; 0.009-0.012] vs 0.013 [Q1-Q3; 0.011-0.016] ml/cmH2O for untreated diabetic mice) was seen in the p75NTR antagonist-treated group after 4 weeks of treatment with significantly stabilised contractile responses to KCl, carbachol and electric field stimulation (p < 0.05 for each) compared with diabetic mice. Bladder dysfunction observed in diabetic mice was associated with a significant increase in bladder proNGF/NGF ratio (3.1 [±1.2] vs 0.26 [±0.04] ng/pg in control group, p < 0.05 at week 2 of treatment) and TNF-α (p < 0.05). The proNGF/NGF ratio was partially reduced (about 60% reduction) with both treatments (1.03 [±0.6] ng/pg for proNGF antibody-treated group and 1.4 [±0.76] ng/pg for p75NTR blocker-treated group after 2 weeks of treatment), concomitant with a significant decrease in the bladder levels of TNF-α (p < 0.05), despite persistent hyperglycaemia. CONCLUSIONS/INTERPRETATION Our findings indicate that blockade of proNGF and the p75NTR receptor in diabetes can impede the development and progression of DVD. The reported improvements in morphological and functional features in our DVD model validates the proNGF/p75NTR axis as a potential therapeutic target in this pathology. Graphical abstract.
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Affiliation(s)
- Abubakr H Mossa
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
| | - Alba Galan
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
| | - Philippe G Cammisotto
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
| | - Monica Velasquez Flores
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
| | - Samer Shamout
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
- Division of Urology, Department, of Surgery, McGill University, Montreal, QC, Canada
| | - Pablo Barcelona
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
| | - H Uri Saragovi
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
- Center for Experimental Therapeutics, Jewish General Hospital, Montreal, QC, Canada
- Department of Ophthalmology and Vision Sciences, McGill University, Montreal, QC, Canada
| | - Lysanne Campeau
- Lady Davis Research Institute, McGill University, 3755 Chemin de la Cote-Ste-Catherine, Montreal, QC, H3T 1E2, Canada.
- Division of Urology, Department, of Surgery, McGill University, Montreal, QC, Canada.
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Assaly R, Faugeroux J, Laurin M, Compagnie S, Alexandre L, Giuliano F, Behr-Roussel D. Silodosin improves functional consequences of lower urinary tract obstruction secondary to benign prostate hypertrophy, a proof of concept study in the spontaneously hypertensive rat supplemented with testosterone. BMC Urol 2020; 20:132. [PMID: 32854676 PMCID: PMC7453715 DOI: 10.1186/s12894-020-00699-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 08/18/2020] [Indexed: 11/13/2022] Open
Abstract
Background The main purpose of this study is to investigate the effect of silodosin on the urodynamic consequences in a previously established model of lower urinary tract symptoms associated with benign prostate hyperplasia, the spontaneously hypertensive rats (SHR) supplemented with testosterone. Methods Three groups of animals (8-week-old; n = 10/group) were considered: Wistar Kyoto (control) rats (WKY), SHR supplemented with testosterone at 3 mg/kg/day and treated with either vehicle (SHR-T, n = 10) or silodosin at 0.1 mg/kg/day (SHR-T + silodosin, n = 10) by oral gavage for 6 weeks. Cystometry experiments were performed. The bladder was harvested, weighed and paraffin-embedded for morphometric analysis. The prostate was also harvested and weighed. Results The number of animals included in the analysis were n = 10/10 for WKY and n = 7–8/10 for each SHR rats supplemented with testosterone group. SHR-T displayed a significant decrease in the intercontraction interval, infused volume and mean flow rate whereas the frequency of non-voiding contractions was increased. Silodosin improved the voiding behavior of SHR-T by significantly increasing the intercontraction interval, the infused volume and the mean flow rate and decreasing the number of non-voiding contractions. SHR-T displayed a significant increase in prostate and bladder weights and a 15% increase in the detrusor wall area compared to WKY. Conclusions Chronic silodosin treatment relieved storage symptoms in SHR supplemented with testosterone and decreased the frequency of non-voiding detrusor contractions during the filling phase.
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Affiliation(s)
- Rana Assaly
- Pelvipharm, Montigny-le-Bretonneux, France.,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - Julie Faugeroux
- Pelvipharm, Montigny-le-Bretonneux, France.,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - Miguel Laurin
- Pelvipharm, Montigny-le-Bretonneux, France.,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | - Sandrine Compagnie
- Pelvipharm, Montigny-le-Bretonneux, France.,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France
| | | | - François Giuliano
- Pelvipharm, Montigny-le-Bretonneux, France.,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France.,AP-HP, Neuro-Uro-Andrology, Department of Physical Medicine and Rehabilitation, Raymond Poincaré Hospital, Garches, France
| | - Delphine Behr-Roussel
- Pelvipharm, Montigny-le-Bretonneux, France. .,Université Paris-Saclay, UVSQ, Inserm, END-ICAP, Versailles, France.
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European Society for Sexual Medicine Consensus Statement on the Use of the Cavernous Nerve Injury Rodent Model to Study Postradical Prostatectomy Erectile Dysfunction. Sex Med 2020; 8:327-337. [PMID: 32674971 PMCID: PMC7471127 DOI: 10.1016/j.esxm.2020.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/16/2020] [Accepted: 06/14/2020] [Indexed: 01/24/2023] Open
Abstract
INTRODUCTION Rodent animal models are currently the most used in vivo model in translational studies looking into the pathophysiology of erectile dysfunction after nerve-sparing radical prostatectomy. AIM This European Society for Sexual Medicine (ESSM) statement aims to guide scientists toward utilization of the rodent model in an appropriate, timely, and proficient fashion. METHODS MEDLINE and EMBASE databases were searched for basic science studies, using a rodent animal model, looking into the consequence of pelvic nerve injury on erectile function. MAIN OUTCOME MEASURES The authors present a consensus on how to best perform experiments with this rodent model, the details of the technique, and highlight possible pitfalls. RESULTS Owing to the specific issue-basic science-Oxford 2011 Levels of Evidence criteria cannot be applied. However, ESSM statements on this topic will be provided in which we summarize the ESSM position on various aspects of the model such as the use of the Animal Research Reporting In Vivo Experiments guideline and the of common range parameter for nerve stimulation. We also highlighted the translational limits of the model. CONCLUSION The following statements were formulated as a suggestive guidance for scientists using the cavernous nerve injury model. With this, we hope to standardize and further improve the quality of research in this field. It must be noted that this model has its limitations. Weyne E, Ilg MM, Cakir OO, et al. European Society for Sexual Medicine Consensus Statement on the Use of the Cavernous Nerve Injury Rodent Model to Study Postradical Prostatectomy Erectile Dysfunction. Sex Med 2020;8:327-337.
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Maruyama I, Yamamoto S, Tsuchioka K, Yamazaki T. Effects of vibegron, a novel β3-adrenoceptor agonist, and its combination with imidafenacin or silodosin in a rat with partial bladder outlet obstruction. Eur J Pharmacol 2020; 878:173096. [DOI: 10.1016/j.ejphar.2020.173096] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 02/21/2020] [Accepted: 03/31/2020] [Indexed: 01/20/2023]
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Verification and Defined Dosage of Sodium Pentobarbital for a Urodynamic Study in the Possibility of Survival Experiments in Female Rat. BIOMED RESEARCH INTERNATIONAL 2020; 2020:6109497. [PMID: 32626750 PMCID: PMC7306087 DOI: 10.1155/2020/6109497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 05/24/2020] [Accepted: 05/30/2020] [Indexed: 11/18/2022]
Abstract
Objectives To evaluate the effects of pentobarbital dosages on lower urinary tract function and to define an appropriate dosage of sodium pentobarbital that would be suitable for urodynamic studies in which recovery from anesthesia and long term survive were needed for subsequent experiment. Methods Twenty-four 8-week-old, female, virgin, Sprague-Dawley rats (200-250 g) were used in this study. Rats in study groups received gradient doses of pentobarbital intraperitoneally, and those in the control group received urethane intraperitoneally. External urethral sphincter electromyography (EUS-EMG) was recorded simultaneously during cystometry and leak point pressure tests. The toe-pinch reflex was used to determine the level of anesthesia. Results Micturition was normally induced in both the urethane group and 32 mg/kg pentobarbital group. However, in groups of 40 mg/kg or 36 mg/kg pentobarbital, micturition failed to be induced; instead, nonvoiding contractions accompanied by EUS-EMG tonic activity were observed. There were no significant differences in leak point pressure or EUS-EMG amplitude or frequency between the urethane and 32 mg/kg pentobarbital groups. Conclusions This study confirmed significant dose-dependent effects of pentobarbital on lower urinary tract function and 32 mg/kg pentobarbital as an appropriate dosage for recovery urodynamic testing, which enable the achievement of expected essential micturition under satisfactory anesthesia in female rats.
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Wiedmann NM, Wong AW, Keast JR, Osborne PB. Sex differences in c-Fos and EGR-1/Zif268 activity maps of rat sacral spinal cord following cystometry-induced micturition. J Comp Neurol 2020; 529:311-326. [PMID: 32415681 PMCID: PMC7818477 DOI: 10.1002/cne.24949] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Revised: 04/21/2020] [Accepted: 05/07/2020] [Indexed: 12/24/2022]
Abstract
Storage and voiding of urine from the lower urinary tract (LUT) must be timed precisely to occur in appropriate behavioral contexts. A major part of the CNS circuit that coordinates this activity is found in the lumbosacral spinal cord. Immediate early gene (IEG) activity mapping has been widely used to investigate the lumbosacral LUT-related circuit, but most reports focus on the effects of noxious stimulation in anesthetized female rats. Here we use c-Fos and EGR-1 (Zif268) activity mapping of lumbosacral spinal cord to investigate cystometry-induced micturition in awake female and male rats. In females, after cystometry c-Fos neurons in spinal cord segments L5-S2 were concentrated in the sacral parasympathetic nucleus (SPN), dorsal horn laminae II-IV, and dorsal commissural nucleus (SDCom). Comparisons of cystometry and control groups in male and female revealed sex differences. Activity mapping suggested dorsal horn laminae II-IV was activated in females but showed net inhibition in males. However, inhibition in male rats was not detected by EGR-1 activity mapping, which showed low coexpression with c-Fos. A class of catecholamine neurons in SPN and SDCom neurons were also more strongly activated by micturition in females. In both sexes, most c-Fos neurons were identified as excitatory by their absence of Pax2 expression. In conclusion, IEG mapping in awake male and female rats has extended our understanding of the functional molecular anatomy of the LUT-related circuit in spinal cord. Using this approach, we have identified sex differences that were not detected by previous studies in anesthetized rats.
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Affiliation(s)
- Nicole M Wiedmann
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Victoria, Australia
| | - Agnes W Wong
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Victoria, Australia
| | - Janet R Keast
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Victoria, Australia
| | - Peregrine B Osborne
- Department of Anatomy and Neuroscience, University of Melbourne, Melbourne, Victoria, Australia
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