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Badshah M, Ibrahim J, Su N, Whiley P, Whittaker M, Exintaris B. The Effects of Age on Prostatic Responses to Oxytocin and the Effects of Antagonists. Biomedicines 2023; 11:2956. [PMID: 38001957 PMCID: PMC10669827 DOI: 10.3390/biomedicines11112956] [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: 09/19/2023] [Revised: 10/18/2023] [Accepted: 10/24/2023] [Indexed: 11/26/2023] Open
Abstract
Benign prostatic hyperplasia (BPH) is an age-related enlargement of the prostate with urethral obstruction that predominantly affects the middle-aged and older male population, resulting in disruptive lower urinary tract symptoms (LUTS), thus creating a profound impact on an individual's quality of life. The development of LUTS may be linked to overexpression of oxytocin receptors (OXTR), resulting in increased baseline myogenic tone within the prostate. Thus, it is hypothesised that targeting OXTR using oxytocin receptor antagonists (atosiban, cligosiban, and β-Mercapto-β,β-cyclopentamethylenepropionyl1, O-Me-Tyr2, Orn8]-Oxytocin (ßMßßC)), may attenuate myogenic tone within the prostate. Organ bath and immunohistochemistry techniques were conducted on prostate tissue from young and older rats. Our contractility studies demonstrated that atosiban significantly decreased the frequency of spontaneous contractions within the prostate of young rats (**** p < 0.0001), and cligosiban (* p < 0.05), and ßMßßC (**** p < 0.0001) in older rats. Additionally, immunohistochemistry findings revealed that nuclear-specific OXTR was predominantly expressed within the epithelium of the prostate of both young (*** p < 0.001) and older rats (**** p < 0.0001). In conclusion, our findings indicate that oxytocin is a key modulator of prostate contractility, and targeting OXTR is a promising avenue in the development of novel BPH drugs.
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Affiliation(s)
- Masroor Badshah
- Hudson Institute of Medical Research, Monash University, Clayton, VIC 3168, Australia;
| | - Jibriil Ibrahim
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Parkville, VIC 3052, Australia (N.S.)
| | - Nguok Su
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Parkville, VIC 3052, Australia (N.S.)
| | - Penny Whiley
- Hudson Institute of Medical Research, Monash University, Clayton, VIC 3168, Australia;
| | - Michael Whittaker
- Drug, Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Parkville, VIC 3052, Australia;
| | - Betty Exintaris
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Parkville, VIC 3052, Australia (N.S.)
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Abstract
Oxytocin and oxytocin receptors are synthesized in the periphery where paracrine/autocrine actions have been described alongside endocrine actions effected by central release of oxytocin from the posterior pituitary. In the female reproductive system, classical actions of uterine contraction and milk ejection from mammary glands are accompanied by actions in the ovaries where roles in steroidogenesis, follicle recruitment and ovulation have been described. Steroidogenesis, contractile activity, and gamete health are similarly affected by oxytocin in the male reproductive tract. In the cardiovascular system, a local oxytocinergic system appears to play an important cardio-protective role. This role is likely associated with emerging evidence that peripheral oxytocin is an important hormone in the endocrinology of glucose homeostasis due to its actions in adipose, the pancreas, and the largely ignored oxytocinergic systems of the adrenal glands and liver. Gene polymorphisms are shown to be associated with a number of reported traits, not least factors associated with metabolic syndrome.
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Affiliation(s)
- Stephen J Assinder
- Discipline of Physiology, School of Medical Sciences, Faculty of Medicine and Health, University of Sydney, Camperdown, NSW, Australia.
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Kim JH, Yu SH, Kim SO. Decreased urothelial expression of caveolin 1 and 2 in aging rats showing detrusor overactivity: Potential association with aging bladder. Investig Clin Urol 2021; 62:690-696. [PMID: 34729968 PMCID: PMC8566782 DOI: 10.4111/icu.20210284] [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: 07/20/2021] [Revised: 08/29/2021] [Accepted: 09/14/2021] [Indexed: 11/18/2022] Open
Abstract
PURPOSE The purpose of this study was to investigate the effect of aging on bladder function and caveolin protein expression in rat urothelium. MATERIALS AND METHODS Female Sprague-Dawley rats were divided into the following two groups: young age control group (12 weeks) and old-aged group of rats (80 weeks). Urodynamic measurements were taken to compare the contraction interval and the contraction pressure between the two groups. The expression and cellular localization of caveolin 1 and 2 in the urothelium of the rat urinary bladder were determined by Western blot and immunofluorescence microscopy. RESULTS In cystometrograms, the contraction interval (min) was significantly shorter in the old-aged group (3.7±0.5 min) than in the young age control group (6.2±0.8 min). Also, the average contraction pressure (mmHg) was lower in the old-aged group (8.4±0.6 mmHg) than in the young age control group (13.2±1.3 mmHg). Caveolin 1 and 2 were expressed in the subepithelial area in the urothelium. The protein expression of both caveolin 1 and 2 was significantly lower in the old-aged group than in the young age control group. CONCLUSIONS Aging caused a significant change in the expression of caveolin 1 and 2 in the urothelium of the rat urinary bladder. These findings suggest that these molecules might have specific roles in the functional change of the urinary bladder that occurs in association with aging.
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Affiliation(s)
- Jae Hyeon Kim
- Department of Urology, Chonnam National University Medical School, Research Institute of Medical Sciences, Gwangju, Korea
| | - Seong Hyeon Yu
- Department of Urology, Chonnam National University Medical School, Research Institute of Medical Sciences, Gwangju, Korea
| | - Sun-Ouck Kim
- Department of Urology, Chonnam National University Medical School, Research Institute of Medical Sciences, Gwangju, Korea.
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Cell proliferation and anti-oxidant effects of oxytocin and oxytocin receptors: role of extracellular signal-regulating kinase in astrocyte-like cells. Endocr Regul 2021; 54:172-182. [PMID: 32857718 DOI: 10.2478/enr-2020-0020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES Oxytocin (OXT) participates in various physiological functions ranging from reproduction to social and non-social behaviors. Recent studies indicate that OXT affects cell growth and metabolism. Here we characterized the growth stimulating and antioxidant actions of OXT and of OXT receptors (OXTR) in a glial cell-line (U-87MG). METHODS We developed an OXTR-knockdown cell-line (U-87MG KD) to establish the receptor specificity of OXT's actions, and the impact of lacking OXTR on growth and survival in glial cells. The role Extracellular-Signal Regulated Kinases (ERK1/2) on glial cell protection against consequences of oxidative stress, and cell proliferation was investigated. RESULTS In U-87MG cells, OXT stimulated cell proliferation and increased ERK1/2 phosphorylation. The specific ERK1/2 inhibitor, PD098059, produced marked inhibition of cell proliferation, and antagonized the stimulating effect of OXT on ERK1/2 phosphorylation and on cell proliferation. Slower growth rates and lower levels of phosphorylated ERK1/2 were observed in OXTR-knockdown cells and in U-87MG cells treated with an OXTR antagonist (L-371,257). In addition to increasing cell proliferation, OXT significantly blunted the rise in reactive oxygen species induced by H2O2, and antagonized the reductions in cell viability induced by H2O2 and camptothecin. The cell protective and antioxidant actions of OXT in U-87MG cells were not observed in the OXTR-knockdown cells. CONCLUSION OXT stimulates the growth of astrocyte-like cells acting on OXTR via ERK1/2 phosphorylation. The protection against apoptosis and the antioxidant capacity of OXT may contribute to the observed increase in cell proliferation. Oxytocin and OXTR appear to be fundamental for cell growth and viability of glial cells.
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Lee SN, Kraska J, Papargiris M, Teng L, Niranjan B, Hammar J, Ryan A, Frydenberg M, Lawrentschuk N, Middendorff R, Ellem SJ, Whittaker M, Risbridger GP, Exintaris B. Oxytocin receptor antagonists as a novel pharmacological agent for reducing smooth muscle tone in the human prostate. Sci Rep 2021; 11:6352. [PMID: 33737570 PMCID: PMC7973579 DOI: 10.1038/s41598-021-85439-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 02/22/2021] [Indexed: 11/09/2022] Open
Abstract
Pharmacotherapies for the treatment of Benign Prostatic Hyperplasia (BPH) are targeted at reducing cellular proliferation (static component) or reducing smooth muscle tone (dynamic component), but response is unpredictable and many patients fail to respond. An impediment to identifying novel pharmacotherapies is the incomplete understanding of paracrine signalling. Oxytocin has been highlighted as a potential paracrine mediator of BPH. To better understand oxytocin signalling, we investigated the effects of exogenous oxytocin on both stromal cell proliferation, and inherent spontaneous prostate contractions using primary models derived from human prostate tissue. We show that the Oxytocin Receptor (OXTR) is widely expressed in the human prostate, and co-localises to contractile cells within the prostate stroma. Exogenous oxytocin did not modulate prostatic fibroblast proliferation, but did significantly (p < 0.05) upregulate the frequency of spontaneous contractions in prostate tissue, indicating a role in generating smooth muscle tone. Application of atosiban, an OXTR antagonist, significantly (p < 0.05) reduced spontaneous contractions. Individual tissue responsiveness to both exogenous oxytocin (R2 = 0.697, p < 0.01) and atosiban (R2 = 0.472, p < 0.05) was greater in tissue collected from older men. Overall, our data suggest that oxytocin is a key regulator of inherent spontaneous prostate contractions, and targeting of the OXTR and associated downstream signalling is an attractive prospect in the development of novel BPH pharmacotherapies.
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Affiliation(s)
- Sophie N Lee
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Jenna Kraska
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia.,TissuPath, Melbourne, VIC, Australia
| | - Melissa Papargiris
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia.,TissuPath, Melbourne, VIC, Australia
| | - Linda Teng
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Birunthi Niranjan
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Johanna Hammar
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Melbourne, VIC, 3052, Australia
| | | | - Mark Frydenberg
- Department of Surgery, Monash University, Melbourne, VIC, Australia.,Australian Urology Associates, Melbourne, VIC, Australia
| | - Nathan Lawrentschuk
- Department of Surgery, Austin Health, University of Melbourne, Melbourne, VIC, Australia.,EJ Whitten Prostate Cancer Research Centre at Epworth Heathcare, Melbourne, Australia
| | - Ralf Middendorff
- Institute of Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Stuart J Ellem
- School of Health and Wellbeing, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Ipswich, QLD, Australia
| | - Michael Whittaker
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Faculty of Pharmacy and Pharmaceutical Sciences, Parkville, VIC, Australia
| | - Gail P Risbridger
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia
| | - Betty Exintaris
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Melbourne, VIC, 3052, Australia.
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Abstract
Cellular senescence is a feature of most somatic cells. It is characterized by an irreversible cell cycle arrest and by the ability to secrete a plethora of mediators of inflammation and growth factors, which can alter the senescent cell's microenvironment. Senescent cells accumulate in tissues over time and contribute to both aging and the development of age-associated diseases. Senescent cells have antagonistic pleiotropic roles in cancer. Given the inability of senescent cells to proliferate, cellular senescence is a powerful tumor suppressor mechanism in young individuals. However, accumulation of senescent stromal cells during aging can fuel cancer cell growth in virtue of their capacity to release factors that stimulate cell proliferation. Caveolin-1 is a structural protein component of caveolae, invaginations of the plasma membrane involved in a variety of cellular processes, including signal transduction. Mounting evidence over the last 10-15 years has demonstrated a central role of caveolin-1 in the development of a senescent phenotype and the regulation of both the anti-tumorigenic and pro-tumorigenic properties of cellular senescence. In this review, we discuss the cellular mechanisms and functions of caveolin-1 in the context of cellular senescence and their relevance to the biology of cancer.
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Tarhan F, Çağlayan Duman N, Özkula S, Karaalp A, Cangüven Ö. In vitro contractile responses of human detrusor smooth muscle to oxytocin: does it really have effect? Aging Male 2020; 23:1141-1145. [PMID: 31910704 DOI: 10.1080/13685538.2020.1711722] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The aim of this study was to investigate the contractile effects of oxytocin (OT) in human detrusor muscle in in vitro conditions. MATERIAL AND METHODS Human detrusor muscle samples were obtained from seven patients that undergone radical cystectomy. Four female Wistar rats' uterine samples were used as control. Contractile responses were tested of carbachol in organ bath. Cumulative concentration response curves were constructed to OT and then the strips were incubated with atosiban (OT antagonist) and a second concentration response curve to OT were constructed. RESULTS Carbachol, contracted all human strips for the functionality test whereas OT in any concentrations did not produce significant contraction on all human strips. In only one bladder strip and in a very high concentration slight contraction was recorded. Moreover no contractile response was recorded in any OT concentrations in the presence of atosiban. The rat uterine strips responded to OT in a dose dependent manner. Atosiban, the OT receptor antagonist diminished totally those contractile responses. CONCLUSION It is been demonstrated here that there is no contractile response to OT in human detrusor muscle. These findings should be supported by further investigations determining the presence of the OT receptor in human detrusor.
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Affiliation(s)
- Fatih Tarhan
- Urology Clinic, Kartal Dr. Lütfi Kırdar Training and Research Hospital, Health Sciences University, Istanbul, Turkey
| | - Nesrin Çağlayan Duman
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey
| | - Songül Özkula
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey
| | - Atila Karaalp
- Department of Medical Pharmacology, Marmara University School of Medicine, Istanbul, Turkey
| | - Önder Cangüven
- Department of Urology, Hamad General Hospital, Doha, Qatar
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Abstract
Overactive bladder (OAB) is characterized by the storage symptoms of urgency with or without urgency incontinence. Although there is no clear cause of this idiopathic disease, overall prevalence of OAB symptoms in individuals aged 40 years old is more than 15%. Oxytocin, which is one of the most powerful contracting neuropeptide, was also shown to exhibit high intrinsic contractile activity on detrusor muscle. Oxytocin receptor antagonists that inhibit of bladder activity might offer new insights into the treatment of OAB.
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Affiliation(s)
- Onder Canguven
- Hamad General Hospital, Doha, Qatar
- Weill Cornell Medicine, Urology, USA
| | - Raidh Talib
- Department of Urology & Andrology, Hamad General Hospital, Doha, Qatar
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9
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Stadler B, Whittaker MR, Exintaris B, Middendorff R. Oxytocin in the Male Reproductive Tract; The Therapeutic Potential of Oxytocin-Agonists and-Antagonists. Front Endocrinol (Lausanne) 2020; 11:565731. [PMID: 33193084 PMCID: PMC7642622 DOI: 10.3389/fendo.2020.565731] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 09/07/2020] [Indexed: 12/12/2022] Open
Abstract
In this review, the role of oxytocin and oxytocin-like agents (acting via the oxytocin receptor and belonging to the oxytocin-family) in the male reproductive tract is considered. Previous research (dating back over 60 years) is revised and connected with recently found aspects of the role oxytocin plays in male reproductive health. The local expression of oxytocin and its receptor in the male reproductive tract of different species is summarized. Colocalization and possible crosstalk to other agents and receptors and their resulting effects are discussed. The role of the newly reported oxytocin focused signaling pathways in the male reproductive tract, other than mediating contractility, is critically examined. The structure and effect of the most promising oxytocin-agonists and -antagonists are reviewed for their potential in treating male disorders with origins in the male reproductive tract such as prostate diseases and ejaculatory disorders.
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Affiliation(s)
- Beatrix Stadler
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
| | - Michael R. Whittaker
- Drug Discovery Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Melbourne, VIC, Australia
| | - Betty Exintaris
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Melbourne, VIC, Australia
| | - Ralf Middendorff
- Institute of Anatomy and Cell Biology, Justus-Liebig-University, Giessen, Germany
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Kerepesi C, Daróczy B, Sturm Á, Vellai T, Benczúr A. Prediction and characterization of human ageing-related proteins by using machine learning. Sci Rep 2018; 8:4094. [PMID: 29511309 PMCID: PMC5840292 DOI: 10.1038/s41598-018-22240-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Accepted: 02/19/2018] [Indexed: 01/08/2023] Open
Abstract
Ageing has a huge impact on human health and economy, but its molecular basis - regulation and mechanism - is still poorly understood. By today, more than three hundred genes (almost all of them function as protein-coding genes) have been related to human ageing. Although individual ageing-related genes or some small subsets of these genes have been intensively studied, their analysis as a whole has been highly limited. To fill this gap, for each human protein we extracted 21000 protein features from various databases, and using these data as an input to state-of-the-art machine learning methods, we classified human proteins as ageing-related or non-ageing-related. We found a simple classification model based on only 36 protein features, such as the "number of ageing-related interaction partners", "response to oxidative stress", "damaged DNA binding", "rhythmic process" and "extracellular region". Predicted values of the model quantify the relevance of a given protein in the regulation or mechanisms of the human ageing process. Furthermore, we identified new candidate proteins having strong computational evidence of their important role in ageing. Some of them, like Cytochrome b-245 light chain (CY24A) and Endoribonuclease ZC3H12A (ZC12A) have no previous ageing-associated annotations.
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Affiliation(s)
- Csaba Kerepesi
- Institute for Computer Science and Control (MTA SZTAKI), Hungarian Academy of Sciences, Budapest, Hungary.
| | - Bálint Daróczy
- Institute for Computer Science and Control (MTA SZTAKI), Hungarian Academy of Sciences, Budapest, Hungary
| | - Ádám Sturm
- Department of Genetics, Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Genetics Research Group, Eötvös Loránd University, Budapest, Hungary
| | - Tibor Vellai
- Department of Genetics, Eötvös Loránd University, Budapest, Hungary
- MTA-ELTE Genetics Research Group, Eötvös Loránd University, Budapest, Hungary
| | - András Benczúr
- Institute for Computer Science and Control (MTA SZTAKI), Hungarian Academy of Sciences, Budapest, Hungary
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Padol AR, Sukumaran SV, Sadam A, Kesavan M, Arunvikram K, Verma AD, Srivastava V, Panigrahi M, Singh TU, Telang AG, Mishra SK, Parida S. Hypercholesterolemia impairs oxytocin-induced uterine contractility in late pregnant mouse. Reproduction 2017; 153:565-576. [DOI: 10.1530/rep-16-0446] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 02/10/2017] [Accepted: 02/27/2017] [Indexed: 12/14/2022]
Abstract
High cholesterol is known to negatively affect uterine contractility inex vivoconditions. The aim of the present study was to reveal the effect ofin vivohypercholesterolemia on spontaneous and oxytocin-induced uterine contractility in late pregnant mouse uterus. Female Swiss albino mice were fed with high cholesterol (HC) diet (0.5% sodium cholate, 1.25% cholesterol and 15% fat) for 6 weeks and then throughout the gestation period after mating. On day 19 of gestation, serum cholesterol level was increased more than 3-fold while triglycerides level was reduced in HC diet-fed animals as compared to control animals fed with a standard diet. In tension experiments, neither the mean integral tension of spontaneous contractility nor the response to CaCl2in high K+-depolarized tissues was altered, but the oxytocin-induced concentration-dependent contractile response in uterine strips was attenuated in hypercholesterolemic mice as compared to control. Similarly, hypercholesterolemia dampened concentration-dependent uterine contractions elicited by a GNAQ protein activator,Pasteurella multocidatoxin. However, it had no effect on endogenous oxytocin level either in plasma or in uterine tissue. It also did not affect the prostaglandin release in oxytocin-stimulated tissues. Western blot data showed a significant increase in caveolin-1 and GRK6 proteins but decline in oxytocin receptor, GNAQ and RHOA protein expressions in hypercholesterolemic mouse uterus. The results of the present study suggest that hypercholesterolemia may attenuate the uterotonic action of oxytocin in late pregnancy by causing downregulation of oxytocin receptors and suppressing the signaling efficacy through GNAQ and RHOA proteins.
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Caveolin-1 expression in oral lichen planus, dysplastic lesions and squamous cell carcinoma. Pathol Res Pract 2017; 213:809-814. [PMID: 28554768 DOI: 10.1016/j.prp.2017.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 02/06/2017] [Accepted: 03/04/2017] [Indexed: 12/24/2022]
Abstract
Caveolin-1(Cav-1), the main part of caveolae structure, is supposed to play a role in pathogenesis of many human tumors. Since oral lichen planus (OLP) is considered as a potential premalignant disease, this study evaluated Cav-1 expression in OLP in comparison with benign hyperkeratosis, dysplastic epithelium and oral squamous cell carcinoma (OSCC), to investigate its possible role in pathogenesis and malignant transformation of OLP. In this cross-sectional retrospective study, immunohistochemical expression of Cav-1 in the epithelial component and stroma was evaluated in 81 samples, including 12 cases of hyperkeratosis, 24 OLP, 22 epithelial dysplasia, and 23 OSCC samples. Correlations between Cav-1 expression and clinicopathological variables were evaluated statistically. Positive Cav-1 staining was found in 58% of OLP, 91% of hyperkeratosis, 100% of epithelial dysplasia, and 95% of OSCC samples. OSCC showed the highest Cav-1 expression and OLP had the lowest (P=0.001). The intensity of staining was significantly increased in stepwise manner from OLP to OSCC (P=0.001). Expression of Cav-1 was related to the grade of samples in OSCC and dysplastic samples (P=0.04). Based on the findings, it was concluded that Cav-1 may play a role in the pathogenesis of OLP and carcinogenesis of SCC, but its role in malignant transformation of OLP is not confirmed. Further studies are needed to evaluate its potential therapeutic function in OLP and SCC.
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Yun SP, Park SS, Ryu JM, Park JH, Kim MO, Lee JH, Han HJ. Mechanism of PKA-dependent and lipid-raft independent stimulation of Connexin43 expression by oxytoxin in mouse embryonic stem cells. Mol Endocrinol 2012; 26:1144-57. [PMID: 22564436 DOI: 10.1210/me.2011-1343] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Previous studies shows that connexins appear very early during murine embryo development, the gap junctional intercellular communication found in the inner cell mass of early embryo is also maintained in embryonic stem cells (ESC), and expression of oxytocin receptor (OTR) is developmentally regulated at early embryonic development. However, effect of oxytocin (OT) on the regulation of the connexin43 (Cx43) and maintenance of undifferentiation is not fully understood in stem cells. Therefore, we investigated the effect of OT on Cx43 expression and related signaling cascades in mouse ESC. OT increased Cx43 expression that was inhibited by the OTR inhibitor atosiban. In experiments to examine whether the effect of OT depends on lipid rafts, caveolin-1 (cav-1), cav-2, and flotillin-2, but not OTR, were detected in lipid raft fractions. Also, colocalization of OTR, cav-1, and cav-2 was not detected. Moreover, the lipid raft disruptor methyl-β-cyclodextrin did not attenuate OT-induced Cx43 expression. In experiments to examine related signaling pathways, OT activated cAMP/protein kinase A (PKA) which was inhibited by adenylyl cyclase inhibitor SQ 22536 and PKA inhibitor PKI. OT increased nuclear factor κ-light-chain-enhancer of activated B cells (NF-κB) phosphorylation which was inhibited by PKI. OT also increased cAMP response element-binding (CREB)/CREB-binding protein (CBP) expression in the nucleus and induced the formation of CREB1/NF-κB/CBP complexes, which was blocked by the NF-κB-specific small interfering RNA, NF-κB inhibitors, SN50, and bay11-7082. Complex disruption by NF-κB inhibitors decreased OT-induced Cx43 expression. In conclusion, OT stimulates Cx43 expression through the NF-κB/CREB/CBP complex via the lipid raft-independent OTR-mediated cAMP/PKA in mouse ESC.
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Affiliation(s)
- Seung Pil Yun
- Department of Veterinary Physiology, College of Veterinary Medicine, Seoul National University, Seoul, Korea
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14
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Lowalekar SK, Cristofaro V, Radisavljevic ZM, Yalla SV, Sullivan MP. Loss of bladder smooth muscle caveolae in the aging bladder. Neurourol Urodyn 2012; 31:586-92. [PMID: 22374691 DOI: 10.1002/nau.21217] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 08/15/2011] [Indexed: 12/16/2022]
Abstract
AIMS Caveolae are specialized regions of the cell membrane that modulate signal transduction and alterations in these structures affect bladder smooth muscle (BSM) contraction. Since bladder dysfunctions are common in the elderly, we evaluated the effect of aging on the morphology of caveolae and caveolin protein expression in BSM. METHODS Caveolar morphology (number, size, and depth) in BSM was determined from electron microscopy images of young (10 weeks), adult (6-month old), and old (12-month old) rat urinary bladders. Changes in expression levels of caveolin proteins with age were investigated by Western blot and immunofluorescence microscopy. Caveolin-3 gene expression was determined by real-time RT-PCR in young and 19-month-old rat bladders. RESULTS Twelve-month-old animals exhibited 50% fewer BSM caveolae compared to young (P < 0.01). The area of caveolae was significantly decreased at 6 and 12 months. Despite a decrease in the number of BSM caveolae at 12 months, the expression of caveolin-1 and cavin-1 were unaltered with age. In contrast, caveolin-2 and caveolin-3 protein expression and immunoreactivity were reduced in BSM at 6 and 12 months of age. Caveolin-3 gene expression was also downregulated at 19 months compared to young animals. CONCLUSION Biological aging significantly decreases BSM caveolae number and morphology with associated selective alteration in caveolin protein expression. Since caveolae are protected membrane regions that regulate signal transduction, age-related alterations in caveolae and caveolin protein expression could alter BSM contractility resulting in bladder dysfunctions of the elderly.
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Affiliation(s)
- Samar K Lowalekar
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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15
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Zou H, Stoppani E, Volonte D, Galbiati F. Caveolin-1, cellular senescence and age-related diseases. Mech Ageing Dev 2011; 132:533-42. [PMID: 22100852 DOI: 10.1016/j.mad.2011.11.001] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Revised: 11/03/2011] [Accepted: 11/05/2011] [Indexed: 01/22/2023]
Abstract
According to the "free radical theory" of aging, normal aging occurs as the result of tissue damages inflicted by reactive oxygen species (ROS) when ROS production exceeds the antioxidant capacity of the cell. ROS induce cellular dysfunctions such as stress-induced premature senescence (SIPS), which is believed to contribute to normal organismal aging and play a role in age-related diseases. Consistent with this hypothesis, increased oxidative damage of DNA, proteins, and lipids have been reported in aged animals and senescent cells accumulate in vivo with advancing age. Caveolin-1 acts as a scaffolding protein that concentrates and functionally regulates signaling molecules. Recently, great progress has been made toward understanding of the role of caveolin-1 in stress-induced premature senescence. Data show that caveolin-mediated signaling may contribute to explain, at the molecular level, how oxidative stress promotes the deleterious effects of cellular senescence such as aging and age-related diseases. In this review, we discuss the cellular mechanisms and functions of caveolin-1 in the context of SIPS and their relevance to the biology of aging.
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Affiliation(s)
- Huafei Zou
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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Sendemir E, Herbert Z, Sivukhina E, Zermann DH, Arnold R, Jirikowski GF. Colocalization of Androgen Binding Protein, Oxytocin Receptor, Caveolin 1 and Proliferation Marker p21 in Benign Prostate Hyperplasia. Anat Histol Embryol 2008; 37:325-31. [DOI: 10.1111/j.1439-0264.2008.00848.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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