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Dinahet T, Barani C, Vantomme M, Curings P, Voulliaume D. [Increased risk of bleeding during abdominal dermolipectomies in men: Myth or reality?]. ANN CHIR PLAST ESTH 2023:S0294-1260(23)00006-7. [PMID: 36966095 DOI: 10.1016/j.anplas.2023.02.001] [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: 01/22/2023] [Accepted: 02/13/2023] [Indexed: 03/27/2023]
Abstract
INTRODUCTION Abdominoplasty is the most frequently performed procedure for the treatment of weight loss sequelaes. It carries risks of complications, especially in patients with multiple metabolic comorbidities. It is commonly accepted that the male population develops more postoperative complications, particularly haemorrhage, but there are very few studies showing this excessive morbidity. The aim of this study was to determine the increased risk of bleeding after anterior and circular abdominoplasty in men by comparing two series of 105 male and female patients. MATERIALS AND METHODS This is a retrospective, single-center study including 105 male subjects undergoing simple or circular abdominoplasty between 2013 and 2022. The control group was composed of 105 women screened on the same terms. The data collection focused on different pre-, intra-, and postoperative variables, with the occurrence of a hematoma or the need for a transfusion during follow-up as the primary outcome. The analysis was performed according to a univariate and multivariate models. RESULTS The rate of hematoma or transfusion, seroma, infection, amount of blood loss, and length of hospital stay were significantly greater in the male group. Multivariate analysis confirmed the independence of gender on the risk of developing a hematoma or requiring a transfusion. CONCLUSION This study shows the excess morbidity in men, particularly haemorrhage, after abdominoplasty. This underlines the importance of a rigorous haemostasis and follow-up in this at risk population.
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Affiliation(s)
- T Dinahet
- Service de chirurgie plastique et reconstructrice, hôpital Saint-Luc Saint-Joseph, Lyon, France.
| | - C Barani
- Service de chirurgie plastique et reconstructrice, hôpital Saint-Luc Saint-Joseph, Lyon, France
| | - M Vantomme
- Service de chirurgie plastique et reconstructrice, hôpital Saint-Luc Saint-Joseph, Lyon, France
| | - P Curings
- Service de chirurgie plastique et reconstructrice, hôpital Saint-Luc Saint-Joseph, Lyon, France
| | - D Voulliaume
- Service de chirurgie plastique et reconstructrice, hôpital Saint-Luc Saint-Joseph, Lyon, France
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Bazvand F, Mahdizad Z, Mohammadi N, Shahi F, Mirghorbani M, Riazi-Esfahani H, Modjtahedi BS. Tamoxifen retinopathy. Surv Ophthalmol 2023:S0039-6257(23)00038-3. [PMID: 36781026 DOI: 10.1016/j.survophthal.2023.02.003] [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: 03/21/2022] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 02/13/2023]
Abstract
Tamoxifen (TAM) is a selective estrogen receptor modulator that is used in the treatment of breast cancer. As there are estrogen receptors in the retina, retinal pigment epithelium, and choroid, these tissues may also be affected by TAM. We describe the reported effects of TAM on the retina and choroid. Medical databases were searched using relevant keywords and the results were extracted and pooled. The incidence of retinal/choroidal toxicity ranged from 0.9% to 12%. There was a wide range for the time of exposure before the development of TAM retinopathy (3 weeks to 13 years). While functional measurements may be appropriate for assessment of TAM retinopathy, they have not been effective for screening patients. There is no generally accepted screening modality, but serial funduscopy and optical coherence tomography imaging seem to be the most reasonable approach for detecting early TAM-induced retinal toxicity.
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Affiliation(s)
- Fatemeh Bazvand
- Department of Ophthalmology, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Zahra Mahdizad
- Department of Ophthalmology, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Nader Mohammadi
- Department of Ophthalmology, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Farhad Shahi
- Department of Hematology and Medical Oncology, Cancer Research Center, Cancer Institute, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran
| | - Masoud Mirghorbani
- Department of Ophthalmology, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran.
| | - Hamid Riazi-Esfahani
- Department of Ophthalmology, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Bobeck S Modjtahedi
- Department of Research and Evaluation, Southern California Permanente Medical Group, Pasadena, CA, USA; Department of Clinical Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, CA, USA; Eye Monitoring Center, Kaiser Permanente Southern California, Baldwin Park, CA, USA
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Pinto-Santini L, Pérez-Clariget R, Ungerfeld R. Does the metabolic and behavior daily variation pattern on rams differ in summer and winter? BIOL RHYTHM RES 2022. [DOI: 10.1080/09291016.2022.2129541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- L Pinto-Santini
- Unidad Académica de Ovinos, Lanas y Caprinos, Departamento de Producción Animal y Salud de los Sistemas Productivos, Facultad de Veterinaria, Universidad de la República, Ruta 1, km 42.500, Libertad 80100, Uruguay
| | - R Pérez-Clariget
- Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Garzón 780, Montevideo 10097, Uruguay
| | - R Ungerfeld
- Unidad Académica de Fisiología, Departamento de Biociencias Veterinarias, Facultad de Veterinaria, Universidad de la República, Ruta 8, km 18, Montevideo 13000, Uruguay
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Pinto-Santini L, Pérez-Clariget R, Ungerfeld R. Daily variation of the cortisol and insulin concentration, glycemia, surface temperature, and behavior patterns due the administration of equine Chorionic Gonadotropin in rams. Domest Anim Endocrinol 2022; 78:106688. [PMID: 34689060 DOI: 10.1016/j.domaniend.2021.106688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/16/2021] [Accepted: 09/16/2021] [Indexed: 11/03/2022]
Abstract
Sex steroids can modulate the circadian rhythmicity of some physiological and behavioral functions of sheep. During the non-breeding season, Corriedale rams have a low testosterone concentration, but the administration of equine Chorionic Gonadotropin (eCG) stimulates its secretion. Therefore, the daily variation of cortisol and insulin concentrations, glycemia, behavioral pattern (eating, ruminating, standing, lying, and sleeping), and rostral and eye surface temperatures were compared in rams treated or not treated with eCG during the non-breeding season [between August (late winter) and September (early spring)]. Twenty Corriedale adult rams (BW 63.4 ± 7.3 kg; BCS: 3.5 ± 0.5; mean ± SD; age: 2-3 years old) were randomly assigned to 1 of 2 treatments: a) Treated: administration of 1000 IU of eCG intramuscularly and b) Control: control, without application of eCG. All the rams were managed under the same feeding and environmental conditions (individual pens outdoors). All variables were measured each hour for 26 h, except testosterone and insulin that were measured at 09:00, 10:00, 12:00, 15:00, 18:00, 21:00, 22:00, 24:00, 03:00, 06:00, 09:00 and 11:00 h. Testosterone and cortisol concentration were greater in Treated than Control rams (testosterone: 32.7 ± 0.7 nmol/L vs 5.8 ± 0.7 nmol/L; P <0.0001; cortisol: 11.3 ± 0.6 nmol/L vs 9.9 ± 0.6 nmol/L; P =0.02). The eye surface temperature was 0.9°C lower in the Treated than in the Control rams (P =0.004). The characteristics of the daily variation pattern of cortisol, glycemia, glycemia:insulin ratio, and surface temperature were not affected by the treatment, the acrophases being at ∼06:00 h, ∼18:00 h, ∼08:00 h, and ∼11:00 h, respectively. The acrophase of insulin concentration was observed earlier in Treated than in Control rams (13:02 ± 0:56 vs 15:47 ± 0:53; P =0.04). Additionally, the acrophase of the time spent eating was advanced in Treated rams (09:48 ± 00:16 vs 10:20 ± 00:16; P =0.04) and sleeping (21:39 ± 00:57 vs 02:02 ± 01:06; P <0.0001). Treated rams slept less time than Control rams (P =0.04). In conclusion, the administration of eCG modulated the daily variation pattern of insulin concentration and the behavioral pattern (period in which rams were observed eating and sleeping). Nevertheless, although there was a greater cortisol concentration and reduced eye surface temperature, the administration of eCG did not modify their daily variation pattern, suggesting that this is robust, limiting the effect of testosterone on their basal pattern.
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Affiliation(s)
- L Pinto-Santini
- Unidad Académica de Ovinos, Lanas y Caprinos, Departamento de Producción Animal y Salud de los Sistemas Productivos, Facultad de Veterinaria), Universidad de la República, Ruta 1, Km 42.500, Libertad - San José. 80100 Uruguay.
| | - R Pérez-Clariget
- Departamento de Producción Animal y Pasturas, Facultad de Agronomía, Universidad de la República, Garzón 780, Montevideo. 10097, Uruguay
| | - R Ungerfeld
- Unidad Académica de Fisiología, Departamento de Biociencias Veterinarias, Facultad de Veterinaria), Universidad de la República, Lasplaces 1620, Montevideo. 11600, Urugua
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Jiang S, Chen G, Yang Z, Wang D, Lu Y, Zhu L, Wang X. Testosterone attenuates hypoxia-induced hypertension by affecting NRF1-mediated transcriptional regulation of ET-1 and ACE. Hypertens Res 2021; 44:1395-1405. [PMID: 34257425 DOI: 10.1038/s41440-021-00703-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2021] [Revised: 05/08/2021] [Accepted: 06/10/2021] [Indexed: 02/07/2023]
Abstract
Hypertension induced by hypoxia at high altitude is one of the typical symptoms of high-altitude reactions (HARs). Emerging evidence indicates that endothelial abnormalities, including increases in angiotensin-2 (Ang-2) and endothelin-1 (ET-1), are closely associated with hypertension. Thus, low blood oxygen-induced endothelial dysfunction through acceleration of Ang-2 and ET-1 synthesis may alleviate HARs. In this study, we investigated the effects of hypoxia on rat blood pressure (BP) and endothelial injury. We found that BP increased by 10 mmHg after treatment with 10% O2 (~5500 m above sea level) for 24 h. Consistently, serum Ang-2 and ET-1 levels were increased along with decreases in NO levels. In endothelial cells, angiotensin-1-converting enzyme (ACE) and ET-1 expression levels were upregulated. Interestingly, nuclear respiratory factor 1 (NRF1) levels were also upregulated, consistent with the changes in ACE and ET-1 levels. We further demonstrated that NRF1 transcriptionally activated ACE and ET-1 by directly binding to their promoter regions, suggesting that the endothelial cell dysfunction induced by hypoxia was due to NRF1-dependent upregulation of ACE and ET-1. Surprisingly, testosterone supplementation showed significant protective effects on BP, while castration induced even higher BPs in rats exposed to hypoxia. We further showed that physiological testosterone repressed NRF1 expression in vivo and in vitro and thereby reduced Ang-2 and ET-1 levels, which was dependent on hypoxia. In summary, we have identified that physiological testosterone protects against hypoxia-induced hypertension through inhibition of NRF1, which transcriptionally regulates ACE and ET-1 expression.
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Affiliation(s)
- Shan Jiang
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China.,School of Life Science and Technology, China Pharmaceutical University, Nanjing, China
| | - Guijuan Chen
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China
| | - Zhihui Yang
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China
| | - Dan Wang
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China
| | - Yapeng Lu
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China
| | - Li Zhu
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China. .,Co-Innovation Center of Neuroregeneration, Jiangsu Key Laboratory of Neuroregeneration, Nantong University, Nantong, 226019, Jiangsu, China.
| | - Xueting Wang
- Institute of Special Environmental Medicine, Nantong University, Nantong, 226019, Jiangsu, China.
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Kaye R, Chandra S, Sheth J, Boon CJF, Sivaprasad S, Lotery A. Central serous chorioretinopathy: An update on risk factors, pathophysiology and imaging modalities. Prog Retin Eye Res 2020; 79:100865. [PMID: 32407978 DOI: 10.1016/j.preteyeres.2020.100865] [Citation(s) in RCA: 116] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/02/2020] [Accepted: 04/27/2020] [Indexed: 02/08/2023]
Abstract
Central serous chorioretinopathy (CSC) is a common form of vision loss, typically seen in working-age men. The pathophysiology behind CSC still eludes us, however significant advances have been made in understanding this disease over the last decade using information from genetic and cell-based studies and imaging modalities. This review aims to give an overview of the current pathophysiology hypotheses surrounding CSC in addition to future directions in cellular work from human induced pluripotent stem cell derived choroidal endothelial cells from CSC patients. Furthermore, this review will provide the reader with an update on the clinical aspects of CSC including risk factors, diagnostic challenges and findings from multimodal imaging.
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Affiliation(s)
- Rebecca Kaye
- Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, SO16 6YD, United Kingdom
| | - Shruti Chandra
- NIHR Moorfields Biomedical Research Centre, 162, City Road, London, EC1V 2PD, United Kingdom
| | - Jay Sheth
- Surya Eye Institute and Research Center, Mumbai, India
| | - Camiel J F Boon
- Leiden University Medical Centre, Department of Ophthalmology, P.O. Box 9600, 2300 RC, Leiden, the Netherlands; Amsterdam University Medical Centers, Department of Ophthalmology, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands
| | - Sobha Sivaprasad
- NIHR Moorfields Biomedical Research Centre, 162, City Road, London, EC1V 2PD, United Kingdom
| | - Andrew Lotery
- Faculty of Medicine, University of Southampton, University Hospital Southampton, Southampton, SO16 6YD, United Kingdom.
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Bolukbasi S, Kandemir Gursel O, Cakir A, Erden B, Karatas G. Retinal structural changes in patients receiving tamoxifen therapy by spectral-domain optical coherence tomography. Cutan Ocul Toxicol 2020; 39:115-121. [PMID: 32100607 DOI: 10.1080/15569527.2020.1734816] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Purpose: To evaluate choroidal thickness, ganglion cell complex (GCC) and photoreceptor outer segment (PROS) length were measured in patients with breast cancer undergoing tamoxifen therapy, using spectral-domain optical coherence tomography (SD-OCT); results were compared with those for normal eyes.Materials and methods: Forty-four patients with breast cancer, undergoing tamoxifen therapy, and 41 healthy controls were included in this prospective, comparative study. All participants underwent a complete ophthalmologic evaluation and SD-OCT. Subfoveal, nasal (nasal distance to fovea 500, 1000, 1500 μm), and temporal (temporal distance to fovea 500, 1000, 1500 μm) choroidal thickness measurements were performed using the enhanced depth imaging mode of SD-OCT. Using an Early Treatment Diagnostic Retinopathy Study (ETDRS) circle at the macular level, the automated retinal segmentation software was applied to determine the thickness of the GCC. PROS length was determined manually, as the distance from the inner surface of the ellipsoid zone to the inner surface of retina pigment epithelium.Results: The mean choroidal thickness was statistically greater in the tamoxifen group than controls in all quadrants (p < 0.001 for all quadrants). Of all tamoxifen users (44 eyes of 44 patients), 33 eyes (75%) had uncomplicated pachychoroid (UCP). Pachychoroid pigment epitheliopathy (PPE) was detected in five tamoxifen-group patients (11.3%). Patients with PPE in one eye had UCP in the fellow eye. Central serous chorioretinopathy findings were observed in one patient. Tamoxifen users had statistically lower GCC thickness in all inner rings of the ETDRS inlay and in the nasal outer ring only (p = 0.027, 0.002, 0.002, 0.001, and 0.030, respectively). No statistically significant difference in mean subfoveal PROS length was found between the groups.Conclusions: SD-OCT provides valuable information for identifying structural changes and evaluating ocular findings in patients receiving tamoxifen therapy. Increased choroidal thickness, PPE and thinning GCC were detected in tamoxifen users. These OCT findings may be an early indicator of retinal toxicity for patients undergoing tamoxifen therapy in the follow-up period.
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Affiliation(s)
- Selim Bolukbasi
- Department of Ophthalmology, University of Health Sciences, Okmeydani Training and Research Hospital, Istanbul, Turkey
| | - Ozge Kandemir Gursel
- Department of Radiation Oncology, University of Health Sciences, Okmeydani Training and Research Hospital, Istanbul, Turkey
| | - Akin Cakir
- Department of Ophthalmology, University of Health Sciences, Okmeydani Training and Research Hospital, Istanbul, Turkey
| | - Burak Erden
- Department of Ophthalmology, University of Health Sciences, Okmeydani Training and Research Hospital, Istanbul, Turkey
| | - Gamze Karatas
- Department of Ophthalmology, University of Health Sciences, Okmeydani Training and Research Hospital, Istanbul, Turkey
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Lorigo M, Mariana M, Lemos MC, Cairrao E. Vascular mechanisms of testosterone: The non-genomic point of view. J Steroid Biochem Mol Biol 2020; 196:105496. [PMID: 31655180 DOI: 10.1016/j.jsbmb.2019.105496] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 09/26/2019] [Accepted: 10/07/2019] [Indexed: 01/19/2023]
Abstract
Testosterone (T) is the predominant endogenous androgen in the bloodstream. At the vascular level, T presents genomic and non-genomic effects, and both effects may overlap. The genomic actions assume that androgens can freely cross the plasma membrane of target cells and bind to nuclear androgen receptors, inducing gene transcription and protein synthesis. The non-genomic effects have a more rapid onset and may be related to the interaction with protein/receptor/ion channels of the plasma membrane. The key T effect at the vascular level is vasorelaxation, which is primarily due to its rapid effect. Thus, the main purpose of this review is to discuss the T non-genomic effects at the vascular level and the molecular pathways involved in its vasodilator effect observed in in vivo and in vitro studies. In this sense, the nuclear receptor activation, the influence of vascular endothelium and the activation or inhibition of ion channels (potassium and calcium channels, respectively) will be reviewed regarding all the data that corroborated or not. Moreover, this review also provides a brief update on the association of T with the risk factors for cardiovascular diseases, namely metabolic syndrome, type 2 diabetes mellitus, obesity, atherosclerosis, dyslipidaemia, and hypertension. In summary, in this paper we consider the non-genomic vascular mode of action of androgen in physiological conditions and the main risk factors for cardiovascular diseases.
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Affiliation(s)
- Margarida Lorigo
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, 6200-506 Covilhã, Portugal.
| | - Melissa Mariana
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, 6200-506 Covilhã, Portugal.
| | - Manuel C Lemos
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, 6200-506 Covilhã, Portugal.
| | - Elisa Cairrao
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, 6200-506 Covilhã, Portugal.
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Lorigo M, Mariana M, Oliveira N, Lemos MC, Cairrao E. Vascular Pathways of Testosterone: Clinical Implications. J Cardiovasc Transl Res 2019; 13:55-72. [DOI: 10.1007/s12265-019-09939-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 11/15/2019] [Indexed: 12/17/2022]
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Van den Broeck T, Soebadi MA, Falter A, Raets L, Duponselle J, Lootsma J, Heintz A, Philtjens U, Hofkens L, Gonzalez-Viedma A, Driesen K, Sandner P, Albersen M, Brône B, Van Renterghem K. Testosterone Induces Relaxation of Human Corpus Cavernosum Tissue of Patients With Erectile Dysfunction. Sex Med 2019; 8:114-119. [PMID: 31767508 PMCID: PMC7042167 DOI: 10.1016/j.esxm.2019.10.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 09/29/2019] [Accepted: 10/24/2019] [Indexed: 01/10/2023] Open
Abstract
Introduction Previous research in the field of cardiovascular diseases suggests a relaxing effect of testosterone (T) on smooth muscle cells. Therefore, it was hypothesized that T could play a significant role in erection development. Aim To investigate the relaxing effect of T and other molecules of the T signaling pathway on human corpus cavernosum (HCC) tissue. Methods Samples of the HCC tissue were obtained from men who underwent penile prosthesis implantation (n = 33) for erectile dysfunction. Samples were used for isometric tension measurement in Ex Vivo experiments. Following standardized precontraction with phenylephrine, increasing doses of T or dihydrotestosterone were administered and blocked by NO/H2S synthesis inhibitors, a KATP blocker, and flutamide (androgen receptor inhibitor). Main Outcome Measure The outcome was relaxation of the HCC tissue, normalized to a maximum precontraction achieved by phenylephrine. Results A dose-dependent relaxing effect of dihydrotestosterone and T was observed with a relaxation of, respectively, 24.9% ± 23.4% (P < .0001) and 41.7% ± 19.1% (P = .01) compared with 6.8% ± 15.9% for vehicle (dimethylsulfoxide) at 300 μM. The relaxing effect of T was not countered by blocking NO synthesis, H2S synthesis, KATP channels, or the androgen receptor. Clinical Implications By understanding the underlying mechanisms of T-induced HCC relaxation, potential new therapeutic targets can be identified. Strengths & Limitations The strength of the study is the use of fresh HCC tissues with reproducible results. The limitation is the need for supraphysiological T levels to induce the observed effect. Conclusion Rapid androgen-induced relaxation of HCC is likely to occur via nongenomic mechanisms. Previously suggested mechanisms of action by which T modulates HCC relaxation have been excluded. Van den Broeck T, Soebadi MA, Falter A, et al. Testosterone Induces Relaxation of Human Corpus Cavernosum Tissue of Patients With Erectile Dysfunction. J Sex Med 2019; 8:114–119.
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Affiliation(s)
| | - Mohammad Ayodhia Soebadi
- Jessa ziekenhuis, Hasselt, Belgium; University Hospitals Leuven, Leuven, Belgium; Department of Urology, Dr Soetomo Academic Hospital, Faculty of Medicine, Universitas Airlangga, Surabaya, Indonesia
| | | | | | | | | | | | | | | | | | | | - Peter Sandner
- Bayer AG, Cardiovascular Research, Pharma Research Center, Wuppertal, Germany; Department of Pharmacology, Hannover Medical School, Hannover, Germany
| | - Maarten Albersen
- University Hospitals Leuven, Leuven, Belgium; Department of Development and Regeneration, Laboratory of Experimental Urology, Leuven University, Leuven, Belgium
| | - Bert Brône
- UHasselt, Hasselt, Belgium; BIOMED Research Institute, Diepenbeek, Belgium
| | - Koenraad Van Renterghem
- Jessa ziekenhuis, Hasselt, Belgium; University Hospitals Leuven, Leuven, Belgium; UHasselt, Hasselt, Belgium.
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Alhawiti NM, Alqahtani SA. Chronic testosterone administration improves cardiac contractility and has a beneficial effect on the haemostatic system by enhancing fibrinolytic activity and inducing hypocoagulation in healthy rats. Arch Physiol Biochem 2019; 125:311-320. [PMID: 29616829 DOI: 10.1080/13813455.2018.1458244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
This study investigated the effects of chronic supraphysiological dose of testosterone propionate administration cardiovascular function in rats from the perspective of haemostatic function including platelet functions, coagulation, and fibrinolysis. Testosterone significantly enhanced cardiac contractility by enhancing LVSP (10%), dp/dtmax (36.7%), dp/dtmin (14.6%) without altering heart rate, diastolic function, and serum lipid profile. While it has no effect on platelets count, thromboxane B2 levels, and platelet aggregation, testosterone significantly enhanced bleeding time and increased circulatory and thoracic aorta mRNA and protein levels of tPA (46.5%, 58.2%, and 74.3%, respectively) and significantly decreased those of PAI-1 (29.3%, 26.4%, and 32.8%, respectively). While there were no significant changes in PT and aPTT, mRNA and protein levels of prothrombin and factor VII were downregulated in the livers of the testosterone-treated rats (57.7% and 64.9%, respectively). Overall, chronic testosterone administration in rats may act as a cardio-protective agent by modulating haemostasis in rats.
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Affiliation(s)
- Naif M Alhawiti
- a College of Applied Medical Sciences, King Saud bin Abdulaziz University for Health Sciences , Riyadh , KSA
- b Kind Abdullah International Medical Research Center (KAIMRC) , Riyadh , KSA
| | - Sultan A Alqahtani
- b Kind Abdullah International Medical Research Center (KAIMRC) , Riyadh , KSA
- c College of Medicine, King Saud bin Abdulaziz University for Health Science (KSAU-HS) , Riyadh , KSA
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Risk Factors for Persistent or Recurrent Central Serous Chorioretinopathy. J Ophthalmol 2019; 2019:5970659. [PMID: 31485346 PMCID: PMC6710733 DOI: 10.1155/2019/5970659] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Revised: 05/23/2019] [Accepted: 06/11/2019] [Indexed: 12/13/2022] Open
Abstract
Purpose To investigate the risk factors for persistent or recurrent central serous chorioretinopathy (CSC). Materials and Methods Consecutive treatment-naïve CSC patients were included from January 2017 to October 2018. All patients were asked to complete questionnaires, addressing previously described risk factors for the development of CSC. Patients were divided into two groups: those with acute CSC, who were in the first episode, with spontaneous resolution of subretinal fluid within 3 months, and with no recurrence within 1 year; and those with persistent or recurrent CSC, the remaining patients. Results In total, 138 patients were enrolled: 20 (14.5%) with acute CSC and 118 (85.5%) with persistent or recurrent CSC. Using multivariate analysis, male sex (odds ratio (OR), 95% confidence interval: 5.63 [1.02–31.02]; p=0.047), older age (OR: 1.14 [1.03–1.25]; p=0.008), and higher Insomnia Severity Index score (OR: 1.30 [1.05–1.60]; p=0.015) were found to be independently associated with persistent or recurrent CSC. Conclusions Male sex, age, and sleep disorders are risk factors for persistent or recurrent CSC in the natural history. These patients may require early photodynamic therapy. Treatment for sleep disorders is strongly recommended. All CSC patients may require careful and periodic follow-up.
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Perusquía M, Contreras D, Herrera N. Hypotestosteronemia is an important factor for the development of hypertension: elevated blood pressure in orchidectomized conscious rats is reversed by different androgens. Endocrine 2019; 65:416-425. [PMID: 31203561 DOI: 10.1007/s12020-019-01978-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 06/06/2019] [Indexed: 01/15/2023]
Abstract
PURPOSE Hypotestosteronemia is an aging-associated disease. Little is known about experimental evidence linking androgen deficiency to hypertension. Various androgens are acute vasodilators, both in vitro and in vivo. We aimed to systematically investigate blood pressure (BP) in male normotensive intact or orchidectomized (ORX) Wistar and Wistar-Kyoto rats. Furthermore, we studied the acute antihypertensive responses of testosterone (TES), its precursor (DHEA), or its 5β-reduced metabolite (5β-DHT) in conscious, unrestrained, hypertensive Wistar rats caused by orchidectomy to determine their potency and efficacy. Similarly, the mechanism of their action mediated by nitric oxide (NO) was studied in vivo. METHODS BP of ORX rats was evaluated weekly for 18 weeks by tail cuff plethysmography. Subsequently, BP of ORX Wistar rats was measured by chronic indwelling vascular catheters, arterial, and venous catheters were implanted under anesthesia for BP recording and androgen administration, respectively. Then, a dose-response curve of each androgen was performed. Likewise, the dose-response curve of 5β-DHT, the most potent androgen, was repeated in the presence of a nonselective NO synthase inhibitor (L-NAME) or an inhibitor of endothelial NO synthesis (Endothelin-1). RESULTS ORX rats progressively increased systolic/diastolic BP (167 ± 2.8/141 ± 3.3 mmHg) over 18 weeks. No difference was found between strains. The BP was reduced in a dose-dependent manner caused by i.v. bolus injection of each androgen, with a rank order of potency of: 5β-DHT = DHEA>>TES. Dose-dependent antihypertension induced by 5β-DHT in ORX rats was not abolished in the presence of L-NAME or Endothelin-1. CONCLUSIONS These in vivo experimental findings reveal that hypotestosteronemia is a determining factor for the development of hypertension which is powerfully reduced by androgen administration, and 5β-DHT induces a potent and effective antihypertensive response by a NO-independent mechanism.
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Affiliation(s)
- Mercedes Perusquía
- Departamento de Biología Celular y Fisiología, Universidad Nacional Autónoma de México, Instituto de Investigaciones Biomédicas, 04510, Mexico City, Mexico.
| | - Daniela Contreras
- Departamento de Biología Celular y Fisiología, Universidad Nacional Autónoma de México, Instituto de Investigaciones Biomédicas, 04510, Mexico City, Mexico
| | - Nieves Herrera
- Departamento de Biología Celular y Fisiología, Universidad Nacional Autónoma de México, Instituto de Investigaciones Biomédicas, 04510, Mexico City, Mexico
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Brill D, Albert D, Fields T, Mikkilineni S, Crandall D, Gao H. Ciliochoroidal effusion syndrome with central serous-like chorioretinopathy and secondary angle closure following exogenous testosterone use. Am J Ophthalmol Case Rep 2019; 15:100482. [PMID: 31198887 PMCID: PMC6557563 DOI: 10.1016/j.ajoc.2019.100482] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 05/30/2019] [Accepted: 05/30/2019] [Indexed: 11/16/2022] Open
Abstract
Purpose To report a unique presentation of ciliochoroidal effusion syndrome with central serous-like chorioretinopathy and secondary angle closure following exogenous testosterone use. Observations A 37 year-old man presented with a two week history of blurred vision, elevated intraocular pressure, and myopic shift in his right eye. Gonioscopy showed angle closure. After YAG iridotomy, ultrasound biomicroscopy (UBM) showed ciliochoroidal effusion and anterior rotation of the ciliary processes. Subsequent color fundus photography, enhanced depth imaging optical coherence tomography (EDI-OCT) and near-infrared reduced-illuminance autofluorescence imaging (NIR-RAFI) showed macular striae, choroidal folds, and increased choroidal thickness without presence of subretinal fluid (SRF) or pigment epithelial detachment (PED). Further questioning revealed the patient was using dermal testosterone gel for six months for treatment of hypogonadism. The patient stopped using the testosterone gel, and his visual acuity and intraocular pressure significantly improved six weeks later. Follow-up UBM showed significant improvement of the ciliochoroidal effusion, and repeat multimodal images demonstrated resolution of the macular striae and choroidal folds, and slightly improved choroidal thickness. Conclusions and importance Our patient demonstrates a rare case of ciliochoroidal effusion, central serous-like chorioretinopathy, and secondary angle closure that dramatically improved with cessation of testosterone. We believe that this unique clinical constellation is the first to be reported associated with exogenous testosterone use.
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Affiliation(s)
- Daniel Brill
- Henry Ford Health System, Department of Ophthalmology, Detroit, MI, USA
| | - Desiree Albert
- Henry Ford Health System, Department of Ophthalmology, Detroit, MI, USA
| | - Taylor Fields
- Henry Ford Health System, Department of Ophthalmology, Detroit, MI, USA
| | | | - David Crandall
- Henry Ford Health System, Department of Ophthalmology, Detroit, MI, USA
| | - Hua Gao
- Henry Ford Health System, Department of Ophthalmology, Detroit, MI, USA
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15
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Feiteiro J, Mariana M, Glória S, Cairrao E. Inhibition of L-type calcium channels by Bisphenol A in rat aorta smooth muscle. J Toxicol Sci 2018; 43:579-586. [PMID: 30298846 DOI: 10.2131/jts.43.579] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Bisphenol A (BPA) is an endocrine disrupting chemical used on a wide range in industry. This compound has been used in the production of polycarbonate plastics and epoxy resins. For this reason and their global use, BPA is one of the most common environmental chemicals to which humans are exposed. This exposure can cause several adverse health outcomes, including at the cardiovascular level. The regulation of ion channels in vascular smooth muscle is pivotal and important for vasoreactivity, and changes in their flux can be involved in the pathophysiology of some cardiovascular diseases. This study aims to analyse in rat aorta whether the vasorelaxant effect of BPA is mediated by L-type Ca2+ channels inhibition. Using male Wistar rat aorta artery rings in the organ bath we analysed the contractility, and to study the activity of calcium current in A7r5 cells we used the whole cell configuration of Patch Clamp technique. Regarding the contractility experiences we observed that in both NA and KCl contraction, BPA caused a rapid and concentration-dependent relaxation. The electrophysiology experiments showed that BPA inhibited the basal and BAY K8644-stimulated whole-cell L-type Ca2+ channel (W-CLTCC) currents, indicating that this drug blocks the L-type Ca2+ channels. Our results suggest that BPA inhibits the W-CLTCC, leading to the relaxation of vascular smooth muscle.
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Affiliation(s)
- Joana Feiteiro
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, Portugal
| | - Melissa Mariana
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, Portugal
| | - Solage Glória
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, Portugal
| | - Elisa Cairrao
- CICS-UBI - Centro de Investigação em Ciências da Saúde, University of Beira Interior, Portugal
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16
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Abstract
BACKGROUND Testosterone, 5α- and 5β-dihydrotestosterone (-DHT) induce an acute in vitro vasorelaxation and in vivo vasodepressor, hypotensive and antihypertensive responses. Our aim was to study whether androgen-induced blood pressure (BP) reduction is involved with a blockade of Ca2+ influx through L-type voltage-operated calcium channels (L-VOCCs) and/or the signaling pathways of α1-adrenoceptors to induce vasoconstriction, which are one of the major mechanisms of BP maintenance. MATERIALS AND METHODS The relaxing potency and efficacy of each androgen in large conduit (thoracic aorta) and resistance (mesenteric) arteries from male hypertensive (SHR) and normotensive (WKY) rats were established. Blood vessels were isometrically recorded and precontracted with KCl or phenylephrine (Phe). RESULTS Androgens induced concentration-dependent vasorelaxation in precontracted arteries from SHR and WKY rats. 5β-DHT was always the most potent vasorelaxant in arteries from SHR. The KCl-induced contraction resulted significantly more sensitive to androgen-induced vasorelaxation than the Phe-induced contraction. On Phe-induced contraction, 5β-DHT was more potent in the mesenteric artery than in the thoracic aorta. CONCLUSIONS The vasorelaxation induced by androgens is mainly mediated by blocking L-VOCCs and in lesser extent by the blockade of multiple signaling pathways operative during α-adrenoceptor-induced vasoconstriction. 5β-DHT regulates vascular resistance and BP by mainly acting in the mesenteric arterial bed, which may explain its outstanding antihypertensive response previously reported.
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Affiliation(s)
- Lucía Isidoro
- a Departamento de Fisiología, Facultad de Medicina , Universidad Autónoma de Madrid , Madrid , Spain
- b Instituto de Investigaciones Biomédicas, Departamento de Biología Celular y Fisiología , Universidad Nacional Autónoma de México , Mexico City , Mexico
| | - Mercedes Ferrer
- a Departamento de Fisiología, Facultad de Medicina , Universidad Autónoma de Madrid , Madrid , Spain
| | - Mercedes Perusquía
- b Instituto de Investigaciones Biomédicas, Departamento de Biología Celular y Fisiología , Universidad Nacional Autónoma de México , Mexico City , Mexico
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Ersoz MG, Arf S, Karacorlu M, Hocaoglu M, Muslubas IS. Pachychoroid Pigment Epitheliopathy Associated With Tamoxifen. Ophthalmic Surg Lasers Imaging Retina 2017; 48:838-842. [DOI: 10.3928/23258160-20170928-10] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 06/02/2017] [Indexed: 11/20/2022]
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Perusquía M, Herrera N, Ferrer M, Stallone JN. Antihypertensive effects of androgens in conscious, spontaneously hypertensive rats. J Steroid Biochem Mol Biol 2017; 167:106-114. [PMID: 27888135 DOI: 10.1016/j.jsbmb.2016.11.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Revised: 11/17/2016] [Accepted: 11/20/2016] [Indexed: 11/18/2022]
Abstract
Androgens are vasoactive steroids that induce acute vasodilation in a number of isolated vascular beds from different species, but the effects of these hormones on systemic blood pressure (BP) have been studied little. Although it has been reported that androgens exert systemic hypotensive effects through peripheral vasodilation in normotensive rats, there have not been any reports of systemic hypotensive effects of androgens in animals with hypertension. This study was designed to evaluate the acute effects of testosterone (TES) and its 5-reduced metabolites on systemic BP in hypertensive rats and to test the hypothesis that hypotestosteronemia may be involved in the pathogenesis of hypertension. Chronic, indwelling catheters were implanted in carotid artery and jugular vein of 18-21-week-old male spontaneously hypertensive rats (SHR) and normotensive-control Wistar-Kyoto (WKY) rats, for BP recording and drug administration, respectively. Bolus injections of TES, 5α- or 5β-dihydrotestosterone (5α- and 5β-DHT), were administrated cumulatively to conscious rats at doses of 0.1-100μmolkg-1min-1. 5β-DHT was also administrated during the pressor effect of Bay K 8644, an L-type voltage-operated Ca2+ channel (L-VOCC) agonist. In separate experiments, BP of orchidectomized normotensive male WKY and Wistar rats, with or without androgen-replacement therapy, was evaluated weekly for 10 weeks by tail-cuff plethysmography. TES and its metabolites reduced BP in a dose-dependent manner, while heart rate was reduced with some androgens at the highest doses. The hypotensive effects of androgens were markedly greater in SHR, with a rank order potency of: 5β-DHT>TES>5α-DHT. 5β-DHT, the most potent antihypertensive androgen, abolished the pressor response to Bay K 8644 in SHR. TES deprivation by orchidectomy increased BP in normotensive WKY and Wistar rats, but this hypertension was prevented by TES replacement therapy. BP responses to androgens are androgen structure-dependent. These data indicate that: 1) androgens play a significant role in the control of BP and may contribute to the pathogenesis of hypertension; 2) blockade of L-VOCC is involved in the antihypertensive effects of androgens, which are non-genomically mediated; and 3) hypotestosteronemia may be a risk factor for hypertension.
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Affiliation(s)
- Mercedes Perusquía
- Universidad Nacional Autónoma de México, Instituto de Investigaciones Biomédicas, Departamento de Biología Celular y Fisiología, México City 04510, Mexico.
| | - Nieves Herrera
- Universidad Nacional Autónoma de México, Instituto de Investigaciones Biomédicas, Departamento de Biología Celular y Fisiología, México City 04510, Mexico
| | - Mercedes Ferrer
- Departamento de Fisiología, Facultad de Medicina, Universidad Autónoma de Madrid, Spain; Instituto de Investigación Hospital Universitario La Paz (IdiPAZ), Madrid, Spain
| | - John N Stallone
- Women's Health Division, Michael E. DeBakey Institute, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4466, USA; Department of Veterinary Physiology & Pharmacology, College of Veterinary Medicine, Texas A&M University, College Station, TX 77843-4466, USA
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19
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Chen YQ, Zhao J, Jin CW, Li YH, Tang MX, Wang ZH, Zhang W, Zhang Y, Li L, Zhong M. Testosterone delays vascular smooth muscle cell senescence and inhibits collagen synthesis via the Gas6/Axl signaling pathway. AGE (DORDRECHT, NETHERLANDS) 2016; 38:60. [PMID: 27206970 PMCID: PMC5005950 DOI: 10.1007/s11357-016-9910-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Accepted: 03/29/2016] [Indexed: 06/05/2023]
Abstract
Testosterone deficiency is associated with a higher incidence of cardiovascular diseases in men. However, its effect on cell senescence, which plays a causal role in vascular aging, remains unclear. Here, we tested the hypothesis that testosterone alleviated vascular smooth muscle cell (VSMC) senescence and collagen synthesis via growth arrest-specific protein 6 (Gas6)/Axl- and Akt/FoxO1a-dependent pathways. Testosterone significantly ameliorated angiotensin II-induced VSMC senescence and collagen overexpression. In addition, testosterone inhibited angiotensin II-induced matrix metalloproteinase-2 (MMP-2) activity, which played a pivotal role in facilitating age-related collagen deposition. Testosterone increased the expression of tissue inhibitor of metalloproteinase-2 but decreased the expression of MMP-2 and membrane type-1 metalloproteinase which contributed to increase MMP-2 activity. The effects on VSMCs senescence and collagen synthesis were mediated by restoration of angiotensin II-induced downregulation of Gas6 and Axl expression and a subsequent reduction of Akt and FoxO1a phosphorylation. The effects of testosterone were reversed by a Gas6 blocker, Axl-Fc, and a specific inhibitor of Axl, R428. Treatment of VSMCs with PI3K inhibitor LY294002 abrogated the downregulating effect of testosterone on MMP-2 activity. Furthermore, when FoxO1a expression was silenced by using a specific siRNA, the inhibitory effect of testosterone on MMP-2 activity was revered as well, that indicated this process was Akt/FoxO1a dependence. Taken together, Gas6/Axl and Akt/FoxO1a were involved in protective effects of testosterone on VSMCs senescence and collagen synthesis. Our results provide a novel mechanism underlying the protective effect of testosterone on vascular aging and may serve as a theoretical basis for testosterone replacement therapy.
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MESH Headings
- Aging/genetics
- Androgens/pharmacology
- Animals
- Apoptosis
- Blotting, Western
- Cattle
- Cells, Cultured
- Cellular Senescence
- Collagen/antagonists & inhibitors
- Collagen/biosynthesis
- DNA/genetics
- Enzyme-Linked Immunosorbent Assay
- Gene Expression Regulation, Developmental
- Intercellular Signaling Peptides and Proteins/biosynthesis
- Intercellular Signaling Peptides and Proteins/genetics
- Male
- Mice
- Mice, Inbred C57BL
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Polymerase Chain Reaction
- Proto-Oncogene Proteins/biosynthesis
- Proto-Oncogene Proteins/genetics
- Receptor Protein-Tyrosine Kinases/biosynthesis
- Receptor Protein-Tyrosine Kinases/genetics
- Signal Transduction/drug effects
- Testosterone/pharmacology
- Axl Receptor Tyrosine Kinase
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Affiliation(s)
- Yan-qing Chen
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Jing Zhao
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Cheng-wei Jin
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
- Department of Cardiology, Central Hospital of Zibo, Zibo, People's Republic of China
| | - Yi-hui Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Meng-xiong Tang
- The Department of Emergency Medicine, Qilu Hospital of Shandong University, Ji'nan, People's Republic of China
| | - Zhi-hao Wang
- Department of Geriatrics, Qilu Hospital of Shandong University, Ji'nan, People's Republic of China
| | - Wei Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Yun Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China
| | - Li Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China.
| | - Ming Zhong
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health; The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital of Shandong University, NO.107, Wen Hua Xi Road, Ji'nan, 250012, People's Republic of China.
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20
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Aoun F, Chemaly AK, Albisinni S, Zanaty M, Roumeguere T. In Search for a Common Pathway for Health Issues in Men - the Sign of a Holmesian Deduction. Asian Pac J Cancer Prev 2016; 17:1-13. [DOI: 10.7314/apjcp.2016.17.1.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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21
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Dai W, Ming W, Li Y, Zheng HY, Wei CD, Rui Z, Yan C. Synergistic Effect of a Physiological Ratio of Estradiol and Testosterone in the Treatment of Early-stage Atherosclerosis. Arch Med Res 2015; 46:619-29. [PMID: 26633088 DOI: 10.1016/j.arcmed.2015.11.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 11/19/2015] [Indexed: 12/31/2022]
Abstract
BACKGROUND AND AIMS Clinical trials and epidemiological data suggest that estrogen replacement therapy (ERT) fails to reduce cardiovascular events in postmenopausal women with coronary heart disease (CHD). The high concentration of estrogen supplementation may increase the risk of thrombosis and result in testosterone deficiency, which is considered the main reason for failure. Thus, we hypothesized that a physiologic dosage of estradiol combined with testosterone may become a new therapeutic strategy in postmenopausal women with CHD. METHODS AND RESULTS We used human umbilical vein endothelial cells (HUVECs) and female C57BL/6 mice as the experimental subjects. With the HUVECs, we found an appropriate E2/T ratio of 5:1 (5×10(-8) mol/L estradiol and 10(-8) mol/L testosterone), which has a significant anti-apoptotic effect on HUVECs by inducing a C-reactive protein. In the in vivo study, we verified the beneficial effects of the defined appropriate E2/T ratio in mice with early stage atherosclerosis. We found that replacement therapy with the defined appropriate E2/T ratio had beneficial effects of reducing the lipid lesions, reducing the formation of foam cells, reducing endothelial injury, modulating the coagulation system function and inhibiting inflammation and was significantly more effective than either estradiol or testosterone supplementation alone. CONCLUSION The present study demonstrated that estradiol and testosterone have a synergistic effect on early stage atherosclerosis, and replacement therapy with the defined appropriate E2/T ratio can significantly suppress the development of atherosclerosis through reducing the lipid lesions, reducing the formation of foam cells, reducing endothelial injury, modulating the coagulation system function and inhibiting inflammation.
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Affiliation(s)
- Wen Dai
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Wang Ming
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yan Li
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China.
| | - Hong-Yun Zheng
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Chuan-Dong Wei
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China; Department of Clinical Laboratory, Affiliated Hospital of You Jiang Medical University for Nationalities, Baise, Guangxi, China
| | - Zhao Rui
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
| | - Cui Yan
- Department of Clinical Laboratory, Renmin Hospital of Wuhan University, Wuhan, China
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22
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Testosterone and atrial natriuretic peptide share the same pathway to induce vasorelaxation of human umbilical artery. J Cardiovasc Pharmacol 2014; 63:461-5. [PMID: 24805147 DOI: 10.1097/fjc.0000000000000060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We recently observed in human umbilical artery smooth muscle cells that testosterone activates protein kinase G and stimulates large-conductance Ca²⁺ activated (BKCa) and voltage sensitive (KV) potassium channels. In the same work, we also show that atrial natriuretic peptide (ANP), an activator of particulate guanylate cyclase (pGC), stimulates the activity of BKCa and KV channels because of protein kinase G activation. The aim of this work was to prove that the relaxant effects of testosterone are also because of the increase of cGMP because of activation of the pGC. Subsarcolemmal cGMP signals were monitored in single cells by recording the cGMP-gated current (ICNG) in human umbilical artery smooth muscle cells expressing the wild-type rat olfactory cyclic nucleotide-gated (CNG) channel. Sodium nitroprusside (10 and 100 μM), ANP (0.1 and 1 μM), or testosterone (0.1, 1, and 10 μM) induced activation of ICNG. This activation induced by testosterone and ANP is bigger than that elicited by sodium nitroprusside. In summary, our study reveals that testosterone and ANP activate the pGC and induce vasorelaxation of human umbilical artery.
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23
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Bakry OA, Samaka RM, Shoeib MAM, Maher A. Immunolocalization of androgen receptor and estrogen receptors in skin tags. Ultrastruct Pathol 2014; 38:344-57. [PMID: 24830664 DOI: 10.3109/01913123.2014.911788] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Skin tags (STs) are benign connective tissue tumors of the dermis. Several clinical observations suggested the involvement of sex steroids in their development. This study aimed at investigating the possible role of androgen receptor (AR) and estrogen receptors (ERs) in STs pathogenesis through their immunohistochemical (IHC) localization in skin biopsies of this disease and to correlate their expression with different clinical and histopathological parameters. Using IHC techniques, we examined 62 cases with STs and 30 gender- and age-matched, healthy subjects, representing the control group. ERα, ERβ, and AR were upregulated in STs compared to normal skin in epidermis and dermis (p < .001 for all). Higher AR H score was significantly associated with axillary STs (p = .02), skin colored tags (p = .03), acanthosis, and papillomatosis (p = .04 for both). Higher ERα H score was significantly associated with hyperpigmented tags (p < .001) and positive family history (p = .003). Higher ERβ H score was significantly associated with female gender and obesity (p = .004 for both). Higher ERα and AR H scores were significantly associated with loose collagen arrangement (p = .02, p = .004, respectively). Higher AR, ERα, and ERβ H scores were significantly associated with the presence of mast cells (p = .01, p = .04, p = .002, respectively) and dilated blood vessels (p = .006, p = .04, p = .04, respectively). In conclusion, AR and ERs may share in STs pathogenesis through their effect on keratinocytes, fibroblasts, and mast cells.
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24
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Kendler M, Kratzsch J, Wetzig T, Simon JC. Sex steroid hormones are not altered in great saphenous veins after varicose vein treatment in male patients. Phlebology 2013; 29:310-7. [PMID: 23508002 DOI: 10.1177/0268355513478586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2013] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The objective of this study was to assess differences in blood samples (sex steroid hormone levels and blood counts) before and after surgical treatment of incompetent great saphenous veins (GSV) in males. METHODS Antecubital vein and GSV blood samples were taken from 11 men with varicose veins and GSV reflux before and after treatment. Six patients were treated with high ligation, stripping and phlebectomy. Five patients were treated with endoluminal radiofrequency ablation and phlebectomy. After a four-year follow-up period (FU) cubital vein and GSV blood samples were taken again. RESULTS In men with varicose veins, significantly higher (P < 0.05) serum testosterone (median 25.18 nmol/L, range 8.82-225.1) and oestradiol (median 179 pmol/L, range 79-941) levels were found in the saphenous vein samples before and after the FU (testosterone 18.8 nmol/L, range 7.96-83.1, oestradiol 171 pmol/L range 125-304) compared with the cubital vein samples before therapy (testosterone 15.72 nmol/L, range 8.36-23.29; oestradiol 84 pmol/L, range 41-147) and after the FU (testosterone 14.5 nmol/L, range 6.10-22.2, oestradiol 117 pmol/L, range 95-165). After the FU, one patient demonstrated recurrent varicose veins with groin neovascularization. Another presented with axial reflux of the anterior accessory saphenous vein. Further differences in blood counts and serum androstenedione levels between the upper and lower extremities were not detected. CONCLUSION The differences between testosterone and oestradiol levels in the leg veins compared with the cubital veins persist after treating men with refluxing saphenous veins. These results suggest that local hormone regulation may be different between leg and arm veins in men with varicose veins.
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Affiliation(s)
- M Kendler
- Department of Dermatology, Venerology and Allergology, Leipzig University Medical Center, Leipzig, Germany
| | - J Kratzsch
- Institute for Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig University Medical Center, Leipzig, Germany
| | - T Wetzig
- Department of Dermatology, Venerology and Allergology, Leipzig University Medical Center, Leipzig, Germany
| | - J C Simon
- Department of Dermatology, Venerology and Allergology, Leipzig University Medical Center, Leipzig, Germany
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Lu Y, Fu Y, Ge Y, Juncos LA, Reckelhoff JF, Liu R. The vasodilatory effect of testosterone on renal afferent arterioles. ACTA ACUST UNITED AC 2012; 9:103-11. [PMID: 22445695 DOI: 10.1016/j.genm.2012.02.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 01/09/2012] [Accepted: 02/19/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND Sex differences exist in a variety of cardiovascular and renal diseases, and testosterone may contribute to the discrepancy. Afferent arterioles (Af-Arts) are the major resistance vessels in the kidney, and they play an important role in the development of renal injury and hypertension. OBJECTIVE We sought to determine the acute effect and underlying mechanism(s) of action of testosterone on Af-Arts. METHODS The mRNA expression of androgen receptors (ARs) in microdissected Af-Arts was measured by reverse transcription-polymerase chain reaction (RT-PCR). An in vitro microperfusion model was used to measure the diameter of Af-Arts in mice. Nitric oxide (NO) was evaluated by an NO-sensitive fluorescent dye, 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate. RESULTS Testosterone had no effect on microperfused Af-Arts when added to the bath. Therefore, we preconstricted the Af-Arts to approximately 30% with norepinephrine (10(-6) M); administration of testosterone (10(-9)-10(-7) M) subsequently dilated the Af-Arts in a dose-dependent manner (P < 0.001; n = 7). The AR mRNA was expressed in microdissected Af-Arts measured by RT-PCR. An AR antagonist, flutamide (10(-5) M), totally blocked the testosterone (10(-8) M)-induced vasodilator effect. Mean (SEM) NO production of the Af-Art wall was increased when testosterone was added to the bath solution after norepinephrine treatment, from 278.4 (12.1) U/min to 351.2 (33.1) U/min (P < 0.05; n = 3). In the presence of NO inhibition with N(G)-nitro-L-arginine methyl ester (3 × 10(-4) M), the testosterone-induced dilatation was blunted compared with norepinephrine (P < 0.05). CONCLUSIONS Testosterone dilated preconstricted mouse Af-Arts in a dose-dependent manner by activation of ARs and partially mediated by NO.
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Affiliation(s)
- Yan Lu
- Department of Physiology and Biophysics, University of Mississippi Medical Center, Jackson, Mississippi 39216, USA
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26
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Mäkinen JI, Perheentupa A, Irjala K, Pöllänen P, Mäkinen J, Huhtaniemi I, Raitakari OT. Endogenous testosterone and brachial artery endothelial function in middle-aged men with symptoms of late-onset hypogonadism. Aging Male 2011; 14:237-42. [PMID: 21831030 DOI: 10.3109/13685538.2011.593655] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In aging men, serum endogenous testosterone is inversely associated with common carotid intima-media thickness (IMT) and directly with beneficial plasma lipid levels; however, the relationship to endothelial function is poorly characterized. We examined the association between serum testosterone and endothelium-dependent brachial artery flow-mediated dilatation (FMD) in middle-aged to elderly men. A group of 83 men aged 40?69 years (mean 55.9 ± 7.5 [SD]) with andropausal symptoms were studied. We measured their serum lipids, testosterone, luteinizing hormone, mean carotid IMT and brachial artery FMD by high resolution B-mode ultrasound. Brachial FMD correlated inversely with vessel diameter (r = -0.38, p = 0.0004), alcohol consumption (r = -0.22, p = 0.047) and serum testosterone (r = -0.27, p = 0.01), but not with luteinizing hormone. In multivariate analysis, FMD was explained by testosterone (β = -0.17, p = 0.0226), high density lipoprotein cholesterol (β = 4.17, p = 0.0312) and vessel diameter (β = -4.37, p < 0.0001) when adjusted for age, body mass index, triglycerides, blood pressure, carotid IMT, smoking, alcohol consumption, cardiovascular diseases and use of lipid lowering medication (HMG-CoA reductase inhibitors). In middle-aged to elderly men, there is an inverse correlation between serum testosterone and brachial FMD. These data suggest that testosterone may have an adverse effect on systemic endothelial function.
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Affiliation(s)
- Juuso I Mäkinen
- Department of Clinical Physiology, University of Turku, Turku, Finland.
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27
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Castela A, Vendeira P, Costa C. Testosterone, endothelial health, and erectile function. ISRN ENDOCRINOLOGY 2011; 2011:839149. [PMID: 22363891 PMCID: PMC3262643 DOI: 10.5402/2011/839149] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Accepted: 07/07/2011] [Indexed: 01/02/2023]
Abstract
Experimental and clinical studies have reported that testosterone has a critical role in the maintenance of homeostatic and morphologic corpus cavernosum components, essential for normal erectile physiology. Although the exact mechanisms mediated by testosterone in erectile function are still under investigation, recent research has suggested an important role in the regulation of endothelial cell (EC) biological functions. Besides stimulating the production of EC mediators, testosterone is also thought to promote the vasculogenic reendothelialization process, mediated by bone marrow-derived endothelial progenitor cells. Additionally, testosterone seems to modulate other erectile tissue components, including trabecular smooth muscle cells, nerve fibers, and tunica albuginea structure, all essential for the erectile process. This paper summarizes current data regarding testosterone-induced cellular and molecular mechanisms that regulate penile tissue components, focusing particularly on the role of testosterone in endothelial health and erectile function.
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Affiliation(s)
- Angela Castela
- Institute for Molecular and Cell Biology of the University of Porto (IBMC-UP), Rua do Campo Alegre, 823, 4150-180 Porto, Portugal
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Traish AM, Miner MM, Morgentaler A, Zitzmann M. Testosterone deficiency. Am J Med 2011; 124:578-87. [PMID: 21683825 DOI: 10.1016/j.amjmed.2010.12.027] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Revised: 12/01/2010] [Accepted: 12/06/2010] [Indexed: 02/07/2023]
Abstract
Testosterone deficiency (TD) afflicts approximately 30% of men aged 40-79 years, with an increase in prevalence strongly associated with aging and common medical conditions including obesity, diabetes, and hypertension. A strong relationship is noted between TD and metabolic syndrome, although the relationship is not certain to be causal. Repletion of testosterone (T) in T-deficient men with these comorbidities may indeed reverse or delay their progression. While T repletion has been largely thought of in a sexual realm, we discuss its potential role in general men's health concerns: metabolic, body composition, and all-cause mortality through the use of a single clinical vignette. This review examines a host of studies, with practical recommendations for diagnosis of TD and T repletion in middle-aged and older men, including an analysis of treatment modalities and areas of concerns and uncertainty.
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Affiliation(s)
- Abdulmaged M Traish
- Department of Biochemistry, Division of Urology, Boston University School of Medicine, Mass., USA
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29
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Seyrek M, Irkilata HC, Vural IM, Yildirim I, Basal S, Yildiz O, Dayanc M. Testosterone Relaxes Human Internal Spermatic Vein Through Potassium Channel Opening Action. Urology 2011; 78:233.e1-5. [DOI: 10.1016/j.urology.2011.03.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Revised: 03/07/2011] [Accepted: 03/07/2011] [Indexed: 10/18/2022]
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30
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Vitale C, Fini M, Speziale G, Chierchia S. Gender differences in the cardiovascular effects of sex hormones. Fundam Clin Pharmacol 2011; 24:675-85. [PMID: 20199585 DOI: 10.1111/j.1472-8206.2010.00817.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Over the last decade, compelling evidence supports the idea that the different impact of cardiovascular disease (CVD) and the differences in vascular biology in men and women may be, at least in part, related to the cardiovascular and metabolic effects of sex steroid hormones. Indeed, androgens and oestrogens influence a multitude of vascular biological processes and their cardiovascular effects are multifaceted. While in women the effects of androgens mainly depend upon oestrogens' levels and, ultimately, upon the estradiol/testosterone ratio, the effects of androgens in men mostly relate to their aromatization into oestrogens. Oestrogens exert potential beneficial effects on the cardiovascular system in both sexes. In women, the effect of oestrogens, alone or in association with progestins, has been widely investigated, but data obtained from older patient populations have lead the medical community and the general public to misleading conclusions. Growing evidence supports the 'timing hypothesis', which suggests that oestrogen/hormone replacement therapy may increase CVD risk if started late after menopause, but produce beneficial cardiovascular effects in younger postmenopausal women. Because in men adequate interventional studies with testosterone are lacking, specific investigations should be performed.
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Affiliation(s)
- Cristiana Vitale
- Centre for Clinical and Basic Research, Department of Medical Sciences, IRCCS San Raffaele, via della Pisana, 235, 00163 Rome, Italy.
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31
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Mäkinen JI, Huhtaniemi I. Androgen Replacement Therapy in Late-Onset Hypogonadism: Current Concepts and Controversies – A Mini-Review. Gerontology 2011; 57:193-202. [DOI: 10.1159/000319635] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Accepted: 06/07/2010] [Indexed: 01/06/2023] Open
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32
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Liu CC, Huang SP, Wu WJ, Lee YC, Wang CJ. Management of Erectile Dysfunction With Hypogonadism. UROLOGICAL SCIENCE 2010. [DOI: 10.1016/s1879-5226(10)60025-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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33
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González-Montelongo MC, Marín R, Gómez T, Díaz M. Androgens are powerful non-genomic inducers of calcium sensitization in visceral smooth muscle. Steroids 2010; 75:533-8. [PMID: 19800357 DOI: 10.1016/j.steroids.2009.09.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2009] [Revised: 09/23/2009] [Accepted: 09/24/2009] [Indexed: 11/16/2022]
Abstract
Androgens are recognized as genotropic inducers of a number of physiological functions mainly associated with the development of sexual characteristics. However, as in the case of estrogens, the number of studies evidencing androgen actions in non-reproductive tissues has steadily grown over the past years. Here, we show that androgens acutely ( approximately 30min) alter the frequency spectrum of peristaltic activity of intestinal smooth muscle and augment the amplitude agonist-induced contractile activity. Maximal stimulation occurred at physiological concentrations of androgens with EC(50) values in the picomolar range. Androgen-induced potentiation was prevented by preincubation with androgen receptor (AR) antagonists but unaffected by cycloheximide plus actinomycin D, indicating that potentiation was mediated by ARs via a non-genomic mechanism. The effects of androgens were mimicked by polyamines and were completely blocked by inhibitors of polyamine synthesis. Using ionomycin-permeabilized intestinal smooth muscle preparations, we demonstrate that androgens exert their effects by inducing a mechanism of sensitization to calcium and not by altering intracellular calcium homeostasis. Correspondingly, the potentiation of mechanical activity induced by androgens was accompanied by an increase in the phosphorylation of the regulatory myosin light chain (LC(20)) within the same time-course than calcium sensitization and mechanical potentiation. The pursuit of potential signalling pathways linking androgen receptor activation with calcium sensitization revealed that mechanical potentiation of intestinal muscle by androgens involve activation of the Rho pathway, whose downstream effector, Rho-associated kinase (ROCK), is eventually responsible for displacement of the phosphorylation/dephosphorylation state of LC(20) towards its phosphorylated form.
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Affiliation(s)
- Maria C González-Montelongo
- Departments of Animal Biology, Institute of Biomedical Technologies (ITB), University of La Laguna, 38206, Tenerife, Spain
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Testosterone and cholesterol vasodilation of rat aorta involves L-type calcium channel inhibition. Adv Pharmacol Sci 2010; 2010:534184. [PMID: 21151505 PMCID: PMC2990104 DOI: 10.1155/2010/534184] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2009] [Revised: 01/07/2010] [Accepted: 01/16/2010] [Indexed: 11/22/2022] Open
Abstract
Testosterone has rapid nongenomic vasodilator effects which could be involved in protective cardiovascular actions. Several authors suggested specific mechanisms to explain this effect, but this matter was not clarified yet. We studied the actions of testosterone and cholesterol on endothelium-denuded rat aorta and their effects on the L-type Ca2+ current (ICa,L) and potassium current (IK). Testosterone (1–100 μM) totally relaxed, in a rapid and concentration-dependent way, the aortic rings contracted by KCl or by (−)-Bay K8644 (BAY). Cholesterol also fully relaxed the contractions induced by KCl. None of the potassium channel antagonists tested (glibenclamide, tetraethylammonium and 4-aminopyridine) modified significantly the relaxant effect of testosterone. The antagonist of classic testosterone receptors, flutamide, did not modify the vasorelaxant effect of testosterone. Furthermore, testosterone and cholesterol inhibited either basal and BAY-stimulated ICa,L in A7r5 cells and they have no effects on IK. In summary, our results demonstrate that cholesterol and testosterone relax rat aorta by inhibiting LTCC. This effect of testosterone is not mediated by the classic hormone receptor or by potassium channel activation. These results suggest that the vasodilator mechanism of cholesterol and testosterone is the same.
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Vikan T, Schirmer H, Njølstad I, Svartberg J. Endogenous sex hormones and the prospective association with cardiovascular disease and mortality in men: the Tromsø Study. Eur J Endocrinol 2009; 161:435-42. [PMID: 19542243 DOI: 10.1530/eje-09-0284] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To study the impact of endogenous testosterone levels in community-dwelling men on later risk for myocardial infarction (MI) and all-cause, cardiovascular disease (CVD), and ischemic heart disease (IHD) mortality. DESIGN Population-based prospective cohort study. METHODS For the analyses, we used a cohort of 1568 randomly selected men, with sex-hormone data participating in the fourth Tromsø Study (1994-1995). Defined end points were first-ever MI (fatal or nonfatal), all-cause, CVD, and IHD mortality. A committee performed thorough ascertainment of end points, following a detailed protocol. Complete ascertainment of end points was until 30 September 2007 for all-cause mortality, until 31 December 2005 for CVD/IHD mortality, and until 31 December 2004 for first-ever MI. The prospective association between total and free testosterone and end points were examined using Cox proportional hazard regression, allowing for multivariate adjustment for age and cardiovascular risk factors. RESULTS During follow-up, there were 395 deaths from all causes, 130 deaths from CVD and 80 deaths from IHD, while 144 men experienced a first-ever MI. There was a significant increase in all-cause mortality risk for men with free testosterone in the lowest quartile (<158 pmol/l) compared with the higher quartiles after age adjustment hazard ratios (HR 1.24, 95% confidence interval, CI 1.01-1.53) and after multivariate adjustments (HR 1.24, 95% CI 1.01-1.54). Total testosterone was not associated with mortality risk. Likewise, there were no significant changes in risk for first-ever MI across different total or free testosterone levels. CONCLUSION Men with free testosterone levels in the lowest quartile had a 24% increased risk of all-cause mortality.
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Affiliation(s)
- Torkel Vikan
- Division of Internal Medicine, University Hospital of North Norway, Tromsø 9038, Norway.
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36
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Testosterone Might Cause Relaxation of Human Corpus Cavernosum by Potassium Channel Opening Action. Urology 2009; 74:229-32. [DOI: 10.1016/j.urology.2008.12.022] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Revised: 11/28/2008] [Accepted: 12/06/2008] [Indexed: 11/17/2022]
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37
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Strategies to Improve Endothelial Function and its Clinical Relevance to Erectile Dysfunction. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.eursup.2008.10.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Kintzel PE, Chase SL, Schultz LM, O'Rourke TJ. Increased Risk of Metabolic Syndrome, Diabetes Mellitus, and Cardiovascular Disease in Men Receiving Androgen Deprivation Therapy for Prostate Cancer. Pharmacotherapy 2008; 28:1511-22. [DOI: 10.1592/phco.28.12.1511] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Kline LW, Karpinski E. Testosterone and dihydrotestosterone inhibit gallbladder motility through multiple signalling pathways. Steroids 2008; 73:1174-80. [PMID: 18586291 DOI: 10.1016/j.steroids.2008.05.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2007] [Revised: 04/21/2008] [Accepted: 05/15/2008] [Indexed: 11/24/2022]
Abstract
Testosterone (T) has been shown to cause vasodilation in rabbit coronary arteries through a nongenomic pathway. Part of this T-induced relaxation was shown to be mediated by opening voltage dependent K(+) channels. T infusion also reduces peripheral resistance in human males with heart failure. The effects of T or its active metabolite 5-alpha dihydrotestosterone (DHT) are not well studied. This study investigates the effect of T and DHT on contraction in guinea pig gallbladder strips. T or DHT induced a concentration-dependent relaxation of cholecystokinin octapeptide (CCK)-induced tension. Pretreatment of the strips with PKA inhibitor 14-22 amide myristolated had no significant effect on the relaxation induced by either T or DHT. Pretreatment of strips with 2-APB, an inhibitor of IP(3) induced Ca(2+) release, produced a significant (p<0.001) reduction in the T- or DHT-induced relaxation. Bisindolymaleimide IV and chelerythrine Cl(-) when used in combination had no significant effect on the amount of CCK-induced tension, but significantly (p<0.01) decreased the amount of T- or DHT-induced relaxation. The flavone chrysin, an aromatase inhibitor, and genistein, an isoflavone, each produced a significant (p<0.01) reduction in CCK-induced tension. Chrysin significantly (p<0.05) increased T-induced relaxation; however, genistein had no effect on T-induced relaxation. It is concluded that T and DHT inhibits gallbladder motility rapidly by nongenomic actions of the hormones. Multiple pathways that include inhibition of intracellular Ca(2+) release, inhibition of extracellular Ca(2+) entry, and the actions of PKC may mediate this effect.
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Affiliation(s)
- Loren W Kline
- University of Alberta, Department of Physiology, Edmonton, Alberta T6G 2H7, Canada.
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40
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Irkilata HC, Yildiz O, Yildirim I, Seyrek M, Basal S, Dayanc M, Ulku C. The Vasodilator Effect of Testosterone on the Human Internal Spermatic Vein and its Relation to Varicocele Grade. J Urol 2008; 180:772-6. [DOI: 10.1016/j.juro.2008.03.188] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2007] [Indexed: 10/21/2022]
Affiliation(s)
- Hasan Cem Irkilata
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Oguzhan Yildiz
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Ibrahim Yildirim
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Melik Seyrek
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Seref Basal
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Murat Dayanc
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
| | - Cunay Ulku
- Departments of Urology and Pharmacology (OY, MS), School of Medicine, Gulhane Military Medical Academy, Ankara, Turkey
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Patel PD, Arora RR. Review: Endothelial dysfunction: A potential tool in gender related cardiovascular disease. Ther Adv Cardiovasc Dis 2008; 2:89-100. [DOI: 10.1177/1753944707088904] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The overwhelming importance of distinctive cardiovascular disease profile in women has stimulated enormous efforts to disclose its cause. In this review, we discuss vascular endothelium as a potential phenotypic marker for the genetic difference. As it is a potentially modifiable factor for cardiovascular disease, every effort should be made to detect it, either directly or indirectly, at the earliest in females who are at risk, so that the future cardiovascular events might be prevented.
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Affiliation(s)
- Pawan D. Patel
- Department of Cardiology, Chicago Medical School, North Chicago VA Medical Centre-133B, 3001, Green Bay Road, North Chicago, IL-60064,
| | - Rohit R. Arora
- Department of Medicine, The Chicago Medical School, Chicago, IL
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Seyrek M, Yildiz O, Ulusoy HB, Yildirim V. Testosterone Relaxes Isolated Human Radial Artery by Potassium Channel Opening Action. J Pharmacol Sci 2007; 103:309-16. [PMID: 17380036 DOI: 10.1254/jphs.fp0060883] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Preliminary clinical studies of testosterone therapy in male patients with coronary artery disease obtained promising results. However, little is known about the in vitro effects of testosterone in human isolated arteries. We investigated the effect of testosterone on contractile tone of human isolated radial artery (RA). Testosterone was added (0.1 - 300 microM ) cumulatively to organ baths after precontraction with KCl (45 mM) and phenylephrine (PE, 10 microM). Testosterone-induced relaxations were tested in the presence of the cyclooxygenase inhibitor indomethacin (10 microM), nitric oxide synthase inhibitor N(omega)-nitro-L-arginine methyl ester (L-NAME, 100 microM), non-selective large conductance Ca(2+)-activated and voltage-sensitive K(+) channel inhibitor tetraethylammonium (TEA, 1 mM), ATP-sensitive K(+) channel inhibitor glibenclamide (GLI, 10 microM), and voltage-sensitive K(+) channel inhibitor 4-aminopyridine (4-AP, 1 mM). Testosterone produced relaxation in human RA (E(max): 53.03 +/- 2.76% and 66.83 +/- 1.97% of KCl and PE-induced contraction, respectively). Except for GLI, the relaxation to testosterone is affected by neither K(+) channel inhibitors (TEA, BaCl(2), and 4-AP), L-NAME, nor indomethacin. We report for the first time that supraphysiological concentrations of testosterone induces relaxation in RA. This response may occur in part via ATP-sensitive K(+) channel opening action.
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Affiliation(s)
- Melik Seyrek
- Department of Pharmacology, Gulhane School of Medicine, Ankara, Turkey
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