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Zou R, Shi W, Ceylan AF, Dong M, Zhang M, Zou Z, Peng B, Dong F, Turdi S, Lin J, Zhang Y, Wang G, Fan X, Ren J. Cardiomyocyte-specific deletion of endothelin receptor A (ET A) obliterates cardiac aging through regulation of mitophagy and ferroptosis. Biochim Biophys Acta Mol Basis Dis 2024; 1870:166958. [PMID: 37963542 DOI: 10.1016/j.bbadis.2023.166958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/23/2023] [Accepted: 11/06/2023] [Indexed: 11/16/2023]
Abstract
Advanced aging evokes unfavorable changes in the heart including cardiac remodeling and contractile dysfunction although the underlying mechanism remains elusive. This study was conducted to evaluate the role of endothelin-1 (ET-1) in the pathogenesis of cardiac aging and mechanism involved. Echocardiographic and cardiomyocyte mechanical properties were determined in young (5-6 mo) and aged (26-28 mo) wild-type (WT) and cardiomyocyte-specific ETA receptor knockout (ETAKO) mice. GSEA enrichment identified differentially expressed genes associated with mitochondrial respiration, mitochondrial protein processing and mitochondrial depolarization in cardiac aging. Aging elevated plasma levels of ET-1, Ang II and suppressed serum Fe2+, evoked cardiac remodeling (hypertrophy and interstitial fibrosis), contractile defects (fractional shortening, ejection fraction, cardiomyocyte peak shortening, maximal velocity of shortening/relengthening and prolonged relengthening) and intracellular Ca2+ mishandling (dampened intracellular Ca2+ release and prolonged decay), the effects with the exception of plasma AngII, ET-1 and Fe2+ were mitigated by ETAKO. Advanced age facilitated O2- production, carbonyl protein damage, cardiac hypertrophy (GATA4, ANP, NFATc3), ER stress, ferroptosis, compromised autophagy (LC3B, Beclin-1, Atg7, Atg5 and p62) and mitophagy (parkin and FUNDC1), and deranged intracellular Ca2+ proteins (SERCA2a and phospholamban), the effects of which were reversed by ETA ablation. ET-1 provoked ferroptosis in vitro, the response was nullified by the ETA receptor antagonist BQ123 and mitophagy inducer CsA. ETA but not ETB receptor antagonism reconciled cardiac aging, which was abrogated by inhibition of mitophagy and ferroptosis. These findings collectively denote promises of targeting ETA, mitophagy and ferroptosis in the management of aging-associated cardiac remodeling and contractile defect.
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Affiliation(s)
- Rongjun Zou
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China; State Key Laboratory of Dampness Syndrome of Chinese Medicine, Guangzhou 510120, Guangdong, China
| | - Wanting Shi
- Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
| | - Asli F Ceylan
- Ankara Yildirim Beyazit University, Faculty of Medicine, Department of Medical Pharmacology, Bilkent, Ankara, Turkey
| | - Maolong Dong
- Department of Burns, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Miao Zhang
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China
| | - Zengxiao Zou
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China
| | - Bo Peng
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China
| | - Feng Dong
- Department of Integrative Medical Sciences, Northeast Ohio Medical University, Rootstown, OH 44272, USA
| | - Subat Turdi
- Department of Cardiology, Zhongshan Hospital Fudan University, Shanghai 200032, China; National Clinical Research Center for Interventional Medicine, Shanghai 200032, China
| | - Jie Lin
- Department of Cardiology, Zhongshan Hospital Fudan University, Shanghai 200032, China; National Clinical Research Center for Interventional Medicine, Shanghai 200032, China
| | - Yingmei Zhang
- Department of Cardiology, Zhongshan Hospital Fudan University, Shanghai 200032, China; National Clinical Research Center for Interventional Medicine, Shanghai 200032, China
| | - Ge Wang
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China; State Key Laboratory of Dampness Syndrome of Chinese Medicine, Guangzhou 510120, Guangdong, China.
| | - Xiaoping Fan
- Department of Cardiovascular Surgery, Guangdong Provincial Hospital of Chinese Medicine, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, Guangdong, China; The Second Clinical College of Guangzhou University of Chinese Medicine, Guangzhou 510405, Guangdong, China; State Key Laboratory of Dampness Syndrome of Chinese Medicine, Guangzhou 510120, Guangdong, China.
| | - Jun Ren
- Department of Cardiology, Zhongshan Hospital Fudan University, Shanghai 200032, China; National Clinical Research Center for Interventional Medicine, Shanghai 200032, China.
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Identification of genetic loci associated with nocturnal enuresis: a genome-wide association study. THE LANCET CHILD & ADOLESCENT HEALTH 2021; 5:201-209. [DOI: 10.1016/s2352-4642(20)30350-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Revised: 10/27/2020] [Accepted: 11/03/2020] [Indexed: 12/31/2022]
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Modulation of lower urinary tract smooth muscle contraction and relaxation by the urothelium. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2018; 391:675-694. [DOI: 10.1007/s00210-018-1510-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 05/08/2018] [Indexed: 10/14/2022]
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Abstract
Several physiopathologic conditions lead to the manifestation of overactive bladder (OAB). These conditions include ageing, diabetes mellitus, bladder outlet obstruction, spinal cord injury, stroke and brain injury, Parkinson's disease, multiple sclerosis, interstitial cystitis, stress and depression. This review has discussed research findings in human and animal studies conducted on the above conditions. Several structural and functional changes under these conditions have not only been observed in the lower urinary tract, but also in the brain and spinal cord. Significant changes were observed in the following areas: neurotransmitters, prostaglandins, nerve growth factor, Rho-kinase, interstitial cells of Cajal, and ion and transient receptor potential channels. Interestingly, alterations in these areas showed great variation in each of the conditions of the OAB, suggesting that the pathophysiology of the OAB might be different in each condition of the disease. It is anticipated that this review will be helpful for further research on new and specific drug development against OAB.
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Affiliation(s)
- Phani B Patra
- King of Prussia, Drexel University College of Medicine, Philadelphia, Pa., USA
| | - Sayani Patra
- Department of Pharmacology and Physiology, Drexel University College of Medicine, Philadelphia, Pa., USA
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Osano A, Yokoyama Y, Hayashi H, Itoh K, Okura T, Deguchi Y, Ito Y, Yamada S. Bladder Endothelin-1 Receptor Binding of Bosentan and Ambrisentan. J Pharmacol Sci 2014; 124:86-91. [DOI: 10.1254/jphs.13198fp] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Ceylan-Isik AF, Dong M, Zhang Y, Dong F, Turdi S, Nair S, Yanagisawa M, Ren J. Cardiomyocyte-specific deletion of endothelin receptor A rescues aging-associated cardiac hypertrophy and contractile dysfunction: role of autophagy. Basic Res Cardiol 2013; 108:335. [PMID: 23381122 DOI: 10.1007/s00395-013-0335-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 12/27/2012] [Accepted: 01/24/2013] [Indexed: 11/25/2022]
Abstract
Cardiac aging is manifested as cardiac remodeling and contractile dysfunction although precise mechanisms remain elusive. This study was designed to examine the role of endothelin-1 (ET-1) in aging-associated myocardial morphological and contractile defects. Echocardiographic and cardiomyocyte contractile properties were evaluated in young (5-6 months) and old (26-28 months) C57BL/6 wild-type and cardiomyocyte-specific ET(A) receptor knockout (ETAKO) mice. Cardiac ROS production and histology were examined. Our data revealed that ETAKO mice displayed an improved survival. Aging increased plasma levels of ET-1 and Ang II, compromised cardiac function (fractional shortening, cardiomyocyte peak shortening, maximal velocity of shortening/relengthening and prolonged relengthening) and intracellular Ca(2+) handling (reduced intracellular Ca(2+) release and decay), the effects of which with the exception of ET-1 and Ang II levels was improved by ETAKO. Histological examination displayed cardiomyocyte hypertrophy and interstitial fibrosis associated with cardiac remodeling in aged C57 mice, which were alleviated in ETAKO mice. Aging promoted ROS generation, protein damage, ER stress, upregulated GATA4, ANP, NFATc3 and the autophagosome cargo protein p62, downregulated intracellular Ca(2+) regulatory proteins SERCA2a and phospholamban as well as the autophagic markers Beclin-1, Atg7, Atg5 and LC3BII, which were ablated by ETAKO. ET-1 triggered a decrease in autophagy and increased hypertrophic markers in vitro, the effect of which were reversed by the ET(A) receptor antagonist BQ123 and the autophagy inducer rapamycin. Antagonism of ET(A), but not ET(B) receptor, rescued cardiac aging, which was negated by autophagy inhibition. Taken together, our data suggest that cardiac ET(A) receptor ablation protects against aging-associated myocardial remodeling and contractile dysfunction possibly through autophagy regulation.
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Affiliation(s)
- Asli F Ceylan-Isik
- Center for Cardiovascular Research and Alternative Medicine, University of Wyoming College of Health Sciences, Laramie, WY 82071, USA
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Zuo Z, Lei H, Wang X, Wang Y, Sonntag W, Sun Z. Aging-related kidney damage is associated with a decrease in klotho expression and an increase in superoxide production. AGE (DORDRECHT, NETHERLANDS) 2011; 33:261-74. [PMID: 20830528 PMCID: PMC3168600 DOI: 10.1007/s11357-010-9176-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2010] [Accepted: 08/18/2010] [Indexed: 05/04/2023]
Abstract
The purpose of this study was to determine changes in klotho, endothelin (ET) receptors, and superoxide production in kidneys of aged rats and whether these changes are exacerbated in aged rats with cognitive impairment. Twenty aged rats (male, 27 months) were divided into an Old Impaired group (n=9) and an Old Intact group (n=11) according to a cognitive function test. A group of 12-month-old rats (n=10) was used as a Young Intact group. Serum creatinine was increased significantly in the Old Impaired group, suggesting impaired renal function. Aged rats showed glomerulosclerosis and tubulointerstitialfibrosis. These pathological changes were markedly aggravated in the old cognitively impaired than in the old cognitively intact animals. Notably, aged rats demonstrated a significant decrease in klotho protein expression in renal cortex and medulla. Protein expression of IL-6, Nox2, ETa receptors and superoxide production were increased whereas mitochondrial SOD (MnSOD) and ETb receptors expression were decreased in kidneys of the aged rats. Interestingly, these changes were more pronounced in the old impaired than in the old intact rats. In conclusion, the aging-related kidney damage was exacerbated in aged rats with cognitive impairment. Klotho, ETB, and MnSOD were downregulated but ETa, IL-6, Nox2, and superoxide production were upregulated in the aging-related kidney damage. These changes were more pronounced in rats with cognitive impairment.
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Affiliation(s)
- Zhong Zuo
- Department of Cardiology, the First Affiliated Hospital, Chongqing Medical University, Chongqing, 400016 China
| | - Han Lei
- Department of Cardiology, the First Affiliated Hospital, Chongqing Medical University, Chongqing, 400016 China
| | - Xiuqing Wang
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104 USA
| | - Yuhong Wang
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104 USA
| | - William Sonntag
- Donald W. Reynolds Department of Geriatric Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104 USA
| | - Zhongjie Sun
- Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104 USA
- Department of Cardiology, the First Affiliated Hospital, Chongqing Medical University, Chongqing, 400016 China
- The Robert and Mary Cade Laboratory, University of Oklahoma Health Sciences Center (OUHSC), 940 S. L. Young Blvd., Oklahoma City, OK 73126-0901 USA
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Abstract
Numerous neuropeptide/receptor systems including vasoactive intestinal polypeptide, pituitary adenylate cyclase-activating polypeptide, calcitonin gene-related peptide, substance P, neurokinin A, bradykinin, and endothelin-1 are expressed in the lower urinary tract (LUT) in both neural and nonneural (e.g., urothelium) components. LUT neuropeptide immunoreactivity is present in afferent and autonomic efferent neurons innervating the bladder and urethra and in the urothelium of the urinary bladder. Neuropeptides have tissue-specific distributions and functions in the LUT and exhibit neuroplastic changes in expression and function with LUT dysfunction following neural injury, inflammation, and disease. LUT dysfunction with abnormal voiding, including urinary urgency, increased voiding frequency, nocturia, urinary incontinence, and pain, may reflect a change in the balance of neuropeptides in bladder reflex pathways. LUT neuropeptide/receptor systems may represent potential targets for therapeutic intervention.
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Wada Y, Takahashi W, Latifpour J, Weiss RM, Matsumoto K, Matsui K, Yamada G, Imamura T. Prostate expression of endothelins and their receptors in rat growth. Reprod Fertil Dev 2008; 20:750-9. [PMID: 18842177 DOI: 10.1071/rd08052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2008] [Accepted: 06/08/2008] [Indexed: 11/23/2022] Open
Abstract
Endothelins (ETs) have been shown to have mitogenic effects on prostate cells in vitro. To study a relationship between ETs and prostate growth, we investigated expression of ET-1 and ET-3 and their receptors ETA and ETB in the dorsolateral (DLP) and ventral (VP) prostate lobes of rats aged 3 weeks, 3 months, and 22 months. The weight ratio of each lobe to the body was not different at 3 weeks but increased more in the DLP than in the VP at 3 months; the ratio did not change at 22 months. The density of the major receptor ETA, measured by radio-labelled ET-1 binding to prostate membrane particulates, was highest at 3 weeks in both prostate lobes and decreased thereafter. mRNA expression levels of ETA, ETB, ET-1, and ET-3 in the DLP and ETA in the VP, as assessed by relative multiplex reverse transcription-polymerase chain reaction, were highest at 3 weeks, and no significant change was seen in mRNA expression of ET-converting enzyme-1. The highest expression of ETA and the ligands at 3 weeks, followed by dramatic growth at 3 months in the DLP, suggests a role of ETA-mediated signal transduction in prostate growth of rats and possibly of humans.
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Affiliation(s)
- Yoshihiro Wada
- Department of Urology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-8556, Japan
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Del Ry S, Maltinti M, Giannessi D, Cavallini G, Bergamini E. Age-related changes in endothelin-1 receptor subtypes in rat heart. Exp Aging Res 2008; 34:251-66. [PMID: 18568982 DOI: 10.1080/03610730802070233] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Density, affinity, and subtype distribution of endothelin-1 (ET-1) binding sites were determined in rat cardiac tissue as a function of age in order to evaluate the association of alterations in the endothelin receptor system and aging in the heart. A significant decrease in the receptor subtype ET-A, which represents 70% to 80% of the total receptor population in cardiac tissue of 3- and 12-month-old rats, was observed in 24-month-old rats with respect to the younger groups. These findings indicate an alteration in ET-1 cardiac receptors associated with aging, mainly due to a variation in the receptor subtype distribution.
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Affiliation(s)
- Silvia Del Ry
- CNR Institute of Clinical Physiology, Laboratory of Cardiovascular Biochemistry, Pisa, Italy
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11
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Sasatomi K, Hiragata S, Miyazato M, Chancellor MB, Morris SM, Yoshimura N. Nitric oxide-mediated suppression of detrusor overactivity by arginase inhibitor in rats with chronic spinal cord injury. Urology 2008; 72:696-700. [PMID: 18358516 DOI: 10.1016/j.urology.2007.12.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Revised: 11/28/2007] [Accepted: 12/30/2007] [Indexed: 10/22/2022]
Abstract
OBJECTIVES We investigated the effects of an arginase inhibitor on bladder overactivity and measured bladder arginase I and II mRNA levels in rats with chronic spinal cord injury (SCI). METHODS We performed awake cystometrograms 3 to 4 weeks after spinal cord transection in female rats. Cystometric parameters such as mean amplitudes and number of non-voiding contractions (NVCs), voided volume, voiding efficiency, and micturition pressure were evaluated before and after intravenous (i.v.) injection of an arginase inhibitor (nor-NOHA: N(omega)-hydroxy-nor-L-arginine) in SCI rats. We also examined the effects of an NOS inhibitor (L-NAME: N(omega)-nitro-L-arginine methyl ester hydrochloride) to determine whether suppression of bladder overactivity by arginase inhibition is mediated by increased production of NO. In addition, we measured mRNA levels of arginase I and II in SCI bladders using quantitative real-time polymerase chain reaction (qRT-PCR). RESULTS We found that nor-NOHA (10 mg/kg, i.v.) significantly decreased the amplitude and number of NVCs. There were no significant changes in other parameters before and after administration of vehicle or nor-NOHA at any dose. When we administered L-NAME (20 mg/kg, i.v.) before nor-NOHA injection (10 mg/kg, i.v.), nor-NOHA-induced inhibition of NVCs was prevented. The relative levels of both arginase I and II mRNA in the bladder were significantly higher in SCI rats compared with spinal cord-intact rats. CONCLUSIONS These results suggest that arginase inhibition can suppress SCI-induced bladder overactivity as indicated by a reduction in NVCs. Thus, arginase inhibition could be an effective treatment for neurogenic bladder overactivity in pathological conditions such as SCI.
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Affiliation(s)
- Kurumi Sasatomi
- Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA
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12
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Michel MC, Barendrecht MM. Physiological and pathological regulation of the autonomic control of urinary bladder contractility. Pharmacol Ther 2008; 117:297-312. [DOI: 10.1016/j.pharmthera.2007.12.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Accepted: 12/04/2007] [Indexed: 01/10/2023]
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Gevaert T, Owsianik G, Hutchings G, Everaerts W, Nilius B, De Ridder D. Maturation of stretch-induced contractile activity and its muscarinic regulation in isolated whole bladder strips from rat. Neurourol Urodyn 2008; 29:789-96. [DOI: 10.1002/nau.20553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Frazier EP, Schneider T, Michel MC. Effects of gender, age and hypertension on beta-adrenergic receptor function in rat urinary bladder. Naunyn Schmiedebergs Arch Pharmacol 2006; 373:300-9. [PMID: 16736152 DOI: 10.1007/s00210-006-0077-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2006] [Accepted: 04/28/2006] [Indexed: 01/25/2023]
Abstract
beta-Adrenoceptors mediate urinary bladder relaxation, and gender, age and hypertension have been linked to bladder dysfunction. Therefore, we have studied whether any of these factors affects the ability of beta-adrenoceptor agonists to relax rat bladder detrusor muscle in vitro. For this purpose we have compared male and female Wistar rats, young and old male Wistar rats, and male normotensive and spontaneously hypertensive rats (SHR). Comparisons were done using KCl-precontracted bladder strips (length about 15-20 mm) and the endogenous agonist noradrenaline, the synthetic non-subtype-selective agonist isoprenaline, and the prototypical beta(3)-adrenoceptor agonists BRL 37,344 and CGP 12,177. While all agonists yielded numerically weaker relaxation in female as compared to male rats (for example for noradrenaline E(max) 40+/-4% vs 53+/-6% relaxation, pEC(50) 5.41+/-0.13 vs 5.60+/-0.14), this difference reached statistical significance only for the weak partial agonist CGP 12,177. Responses to all agonists were attenuated in old as compared to young rats, largely due to a reduced maximum effect, although the difference did not reach statistical significance for isoprenaline. The maximum relaxation responses to noradrenaline and isoprenaline were significantly lower in SHR than in normotensive rats, but both strains exhibited similar responses to the partial agonist BRL 37,344. We conclude that factors associated with bladder dysfunction, such as gender, age and hypertension, can be associated with impaired beta-adrenoceptor-mediated bladder relaxation. However, these alterations are not always consistent across various agonists, and the extent of the differences can be small. Therefore, we propose that beta-adrenoceptor dysfunction may contribute to the pathophysiology of such conditions, but is unlikely to be the only or even the major factor in this regard. We speculate that beta-adrenoceptor agonists may be effective in the treatment of bladder dysfunction under all of these conditions.
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Affiliation(s)
- Elfaridah P Frazier
- Department of Pharmacology and Pharmacotherapy, University of Amsterdam, Amsterdam, The Netherlands
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Schneider T, Hein P, Michel-Reher MB, Michel MC. Effects of ageing on muscarinic receptor subtypes and function in rat urinary bladder. Naunyn Schmiedebergs Arch Pharmacol 2005; 372:71-8. [PMID: 16059734 DOI: 10.1007/s00210-005-1084-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2005] [Accepted: 07/13/2005] [Indexed: 01/25/2023]
Abstract
We compared the density and function of M2 and M3 muscarinic acetylcholine receptor subtypes in the urinary bladder of young adult (3 months) and old (23 months) male Wistar rats. Old rats had a reduced density of muscarinic receptors (96+/-10 vs. 156+/-21 fmol/mg protein), but competition experiments with the M3-selective darifenacin did not indicate alterations in the relative roles of M2 and M3 receptors, with the former being more abundant. The amount of immunodetectable alpha-subunits of various G-proteins potentially linked to muscarinic receptor function was unchanged. The potency of carbachol to contract bladder strips was also unaltered; its maximum effects as well as those of a single KCl concentration were unchanged if raw data or those corrected for strip length were analysed, but somewhat reduced when those corrected for strip weight were analysed. Antagonistic effects of atropine, the M2-selective Ro 320-6206 and the M3-selective darifenacin were unchanged. Agonistic effects of the M3-sparing agonist 4-(2-oxo-2,3-dihydro-benzoimidazol-1-yl)-[1,4']bipiperidinyl-1'-carboxylic acid ethyl ester were similarly poor in young and old rats. Additional experiments were concomitantly performed in submandibular glands from the same animals. While total muscarinic receptor density in submandibular glands was not significantly affected by age (56+/-5 vs. 61+/-4 fmol/mg protein), the relative contribution of M3 receptors significantly declined from 68+/-3% to 57+/-2% based upon darifenacin competition curves. We conclude that aged Wistar rats express fewer muscarinic receptors in their urinary bladder, but there is no change in the relative abundance of M2 and M3 receptors; this is accompanied by only minor if any alterations in receptor responsiveness. In contrast, submandibular gland expresses similar receptor numbers in young and old rats, but slightly fewer M3 receptors in old animals.
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Affiliation(s)
- Tim Schneider
- Department of Urology, University of Essen, Essen, Germany
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Andersson KE, Wein AJ. Pharmacology of the lower urinary tract: basis for current and future treatments of urinary incontinence. Pharmacol Rev 2005; 56:581-631. [PMID: 15602011 DOI: 10.1124/pr.56.4.4] [Citation(s) in RCA: 394] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The lower urinary tract constitutes a functional unit controlled by a complex interplay between the central and peripheral nervous systems and local regulatory factors. In the adult, micturition is controlled by a spinobulbospinal reflex, which is under suprapontine control. Several central nervous system transmitters can modulate voiding, as well as, potentially, drugs affecting voiding; for example, noradrenaline, GABA, or dopamine receptors and mechanisms may be therapeutically useful. Peripherally, lower urinary tract function is dependent on the concerted action of the smooth and striated muscles of the urinary bladder, urethra, and periurethral region. Various neurotransmitters, including acetylcholine, noradrenaline, adenosine triphosphate, nitric oxide, and neuropeptides, have been implicated in this neural regulation. Muscarinic receptors mediate normal bladder contraction as well as at least the main part of contraction in the overactive bladder. Disorders of micturition can roughly be classified as disturbances of storage or disturbances of emptying. Failure to store urine may lead to various forms of incontinence, the main forms of which are urge and stress incontinence. The etiology and pathophysiology of these disorders remain incompletely known, which is reflected in the fact that current drug treatment includes a relatively small number of more or less well-documented alternatives. Antimuscarinics are the main-stay of pharmacological treatment of the overactive bladder syndrome, which is characterized by urgency, frequency, and urge incontinence. Accepted drug treatments of stress incontinence are currently scarce, but new alternatives are emerging. New targets for control of micturition are being defined, but further research is needed to advance the pharmacological treatment of micturition disorders.
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Affiliation(s)
- Karl-Erik Andersson
- Department of Clinical Pharmacology, Lund University Hospital, S-221 85 Lund, Sweden.
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Yono M, Latifpour J, Takahashi W, Pouresmail M, Afiatpour P, Weiss RM. Age-related changes in the properties of the endothelin receptor system at protein and mRNA levels in the rat vas deferens. J Recept Signal Transduct Res 2005; 24:53-66. [PMID: 15344879 DOI: 10.1081/rrs-120034106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
As age-related changes occur in the properties of the endothelin (ET) receptor system in several mammalian tissues, and as there are significant amounts of functional ET receptors in the vas deferens, we investigated the age-related changes in the ET receptor system at the protein and mRNA levels in the rat vas deferens. The ET system was investigated in the vasa deferentia of 3 weeks, 3 months and 22 months old rats. ET receptors were characterized and quantified at the protein level by radioligand receptor binding, and gene transcript levels of ET-1, ET-3, ET converting enzyme-1 (ECE-1), and ET(A) and ET(B) receptor subtypes were quantified by real-time reverse transcription polymerase chain reaction (RT-PCR). The results of radioligand receptor binding assays demonstrate that there is a higher density of total ET receptors in the vas deferens of 3 weeks old rats than in 3 months and 22 months old rats, and that the predominant ET receptor is of the ET(A) subtype in all three ages. Real-time RT-PCR data show that the predominant mRNA expression of ETs and their receptors in all age groups studied are ET-1 and the ET(A) receptor subtype, respectively. Furthermore, ET-1, ET-3, ECE-1, and ET(A) and ET(B) receptor subtype mRNAs are expressed at higher levels in the 3 weeks old rats as compared with the other two age groups. These results demonstrate the presence of age-related changes in the properties of the ET receptor system at both protein and mRNA levels in the rat vas deferens.
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Affiliation(s)
- Makoto Yono
- Section of Urology, Yale University School of Medicine, New Haven, Connecticut 06520, USA
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