1
|
Pereira DA, Calmasini FB, Costa FF, Burnett AL, Silva FH. Nitric Oxide Resistance in Priapism Associated with Sickle Cell Disease: Mechanisms, Therapeutic Challenges, and Future Directions. J Pharmacol Exp Ther 2024; 390:203-212. [PMID: 38262744 DOI: 10.1124/jpet.123.001962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 12/07/2023] [Accepted: 01/05/2024] [Indexed: 01/25/2024] Open
Abstract
Patients with sickle cell disease (SCD) display priapism, a prolonged penile erection in the absence of sexual arousal. The current pharmacological treatments for SCD-associated priapism are limited and focused on acute interventions rather than prevention. Thus, there is an urgent need for new drug targets and preventive pharmacological therapies for this condition. This review focuses on the molecular mechanisms linked to the dysfunction of the NO-cyclic guanosine monophosphate (cGMP)-phosphodiesterase type 5 (PDE5) pathway implicated in SCD-associated priapism. In murine models of SCD, reduced nitric oxide (NO)-cGMP bioavailability in the corpus cavernosum is associated with elevated plasma hemoglobin levels, increased reactive oxygen species levels that inactive NO, and testosterone deficiency that leads to endothelial nitric oxide synthase downregulation. We discuss the consequences of the reduced cGMP-dependent PDE5 activity in response to these molecular changes, highlighting it as the primary pathophysiological mechanism leading to excessive corpus cavernosum relaxation, culminating in priapism. We also further discuss the impact of intravascular hemolysis on therapeutic approaches, present current pharmacological strategies targeting the NO-cGMP-PDE5 pathway in the penis, and identify potential pharmacological targets for future priapism therapies. In men with SCD and priapism, PDE5 inhibitor therapy and testosterone replacement have shown promising results. Recent preclinical research reported the beneficial effect of treatment with haptoglobin and NO donors. SIGNIFICANCE STATEMENT: This review discusses the molecular changes that reduce NO-cGMP bioavailability in the penis in SCD and highlights pharmacological targets and therapeutic strategies for the treatment of priapism, including PDE5 inhibitors, hormonal modulators, NO donors, hydroxyurea, soluble guanylate cyclase stimulators, haptoglobin, hemopexin, and antioxidants.
Collapse
Affiliation(s)
- Dalila Andrade Pereira
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil (D.A.P., F.H.S.); Universidade Federal de São Paulo, Escola Paulista de Medicina, Department of Pharmacology, São Paulo, SP, Brazil (F.B.C.); Hematology and Hemotherapy Center, University of Campinas, Campinas, SP, Brazil (F.F.C.); and The James Buchanan Brady Urological Institute and Department of Urology, The Johns Hopkins School of Medicine, Baltimore, Maryland (A.L.B.)
| | - Fabiano Beraldi Calmasini
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil (D.A.P., F.H.S.); Universidade Federal de São Paulo, Escola Paulista de Medicina, Department of Pharmacology, São Paulo, SP, Brazil (F.B.C.); Hematology and Hemotherapy Center, University of Campinas, Campinas, SP, Brazil (F.F.C.); and The James Buchanan Brady Urological Institute and Department of Urology, The Johns Hopkins School of Medicine, Baltimore, Maryland (A.L.B.)
| | - Fernando Ferreira Costa
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil (D.A.P., F.H.S.); Universidade Federal de São Paulo, Escola Paulista de Medicina, Department of Pharmacology, São Paulo, SP, Brazil (F.B.C.); Hematology and Hemotherapy Center, University of Campinas, Campinas, SP, Brazil (F.F.C.); and The James Buchanan Brady Urological Institute and Department of Urology, The Johns Hopkins School of Medicine, Baltimore, Maryland (A.L.B.)
| | - Arthur L Burnett
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil (D.A.P., F.H.S.); Universidade Federal de São Paulo, Escola Paulista de Medicina, Department of Pharmacology, São Paulo, SP, Brazil (F.B.C.); Hematology and Hemotherapy Center, University of Campinas, Campinas, SP, Brazil (F.F.C.); and The James Buchanan Brady Urological Institute and Department of Urology, The Johns Hopkins School of Medicine, Baltimore, Maryland (A.L.B.)
| | - Fábio Henrique Silva
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil (D.A.P., F.H.S.); Universidade Federal de São Paulo, Escola Paulista de Medicina, Department of Pharmacology, São Paulo, SP, Brazil (F.B.C.); Hematology and Hemotherapy Center, University of Campinas, Campinas, SP, Brazil (F.F.C.); and The James Buchanan Brady Urological Institute and Department of Urology, The Johns Hopkins School of Medicine, Baltimore, Maryland (A.L.B.)
| |
Collapse
|
2
|
Pereira DA, Silveira THR, Calmasini FB, Silva FH. Soluble guanylate cyclase stimulators and activators: new horizons in the treatment of priapism associated with sickle cell disease. Front Pharmacol 2024; 15:1357176. [PMID: 38384294 PMCID: PMC10879333 DOI: 10.3389/fphar.2024.1357176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 01/25/2024] [Indexed: 02/23/2024] Open
Abstract
Priapism, defined as a prolonged and often painful penile erection occurring without sexual stimulation or desire, is a common complication in sickle cell disease (SCD), affecting up to 48% of male patients. This condition presents significant clinical challenges and can lead to erectile dysfunction if not properly managed. Current pharmacological treatments for SCD-related priapism are primarily reactive rather than preventative, highlighting a gap in effective medical intervention strategies. A critical factor in developing priapism is the reduced basal bioavailability of nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) in erectile tissues. New prevention strategies should ideally target the underlying pathophysiology of the disease. Compounds that stimulate and activate soluble guanylate cyclase (sGC) emerge as potential therapeutic candidates since these compounds have the property of inducing cGMP production by sGC. This review explores the potential of sGC stimulators and activators in treating priapism associated with SCD. We discuss the advantages of these agents in the face of the challenging pathophysiology of SCD. Additionally, the review underscores the impact of intravascular hemolysis and oxidative stress on priapism pathophysiology in SCD, areas in which sGC stimulators and activators may also have beneficial therapeutic effects.
Collapse
Affiliation(s)
- Dalila Andrade Pereira
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| | | | - Fabiano Beraldi Calmasini
- Department of Pharmacology, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, SP, Brazil
| | - Fábio Henrique Silva
- Laboratory of Pharmacology, São Francisco University Medical School, Bragança Paulista, SP, Brazil
| |
Collapse
|
3
|
Chen L, Luo Y, Chen Y, Wang L, Wang X, Zhang G, Ji K, Liu H. Time Course Analysis of Transcriptome in Human Myometrium Depending on Labor Duration and Correlating With Postpartum Blood Loss. Front Genet 2022; 13:812105. [PMID: 35836580 PMCID: PMC9273953 DOI: 10.3389/fgene.2022.812105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 05/12/2022] [Indexed: 11/26/2022] Open
Abstract
The maintenance of coordinated powerful episodic contractions of the uterus is the crucial factor for normal labor. The uterine contractility is gradually enhanced with the progression of labor, which is related to the gene expression of the myometrium. Competing endogenous RNA (ceRNA) can also regulate the gene expression. To better understand the role of ceRNA network in labor, transcriptome sequencing was performed on the myometrium of 17 parturients at different labor durations (0–24 h). From this, expression levels of mRNA, long non-coding RNA (lncRNA), circular RNA (circRNA), and microRNA (miRNA) were correlated with labor duration. Then, targeting relationships between mRNAs, lncRNAs, circRNAs, and miRNAs were predicted, and the ceRNA regulatory network was established. The mRNA expression patterns associated with cervical dilation and postpartum bleeding were further investigated. This analysis identified 932 RNAs positively correlated with labor duration (859 mRNAs, 28 lncRNAs, and 45 circRNAs) and 153 RNAs negatively correlated with labor duration (122 mRNAs, 28 lncRNAs, and 3 miRNAs). These mRNAs were involved in protein metabolism, transport, and cytoskeleton functions. According to the targeting relationship among these ceRNAs and mRNAs, a ceRNA network consisting of 3 miRNAs, 72 mRNAs, 2 circRNAs, and 1 lncRNA was established. In addition, two mRNA expression patterns were established using time-series analysis of mRNA expression in different phases of cervical dilation. A ceRNA network analysis for blood loss was performed; postpartum bleeding was closely related to inflammatory response, angiogenesis, and hemostasis. This study identified human myometrial transcriptome and established the ceRNA regulatory network depending on labor duration and highlighted the dynamic changes that occur at ceRNAs during parturition, which need to be considered more in the future to better understand how changes in gene expression are relevant to functional changes in human myometrium at labor.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Kaiyuan Ji
- *Correspondence: Huishu Liu, ; Kaiyuan Ji,
| | - Huishu Liu
- *Correspondence: Huishu Liu, ; Kaiyuan Ji,
| |
Collapse
|
4
|
Li X, Chen X, Hu X, Shen Y, Xu R, Wu L, Shen X. Overexpression of GUCY1A2 Correlates With Poor Prognosis in Gastric Cancer Patients. Front Oncol 2021; 11:632172. [PMID: 34113559 PMCID: PMC8185334 DOI: 10.3389/fonc.2021.632172] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 05/10/2021] [Indexed: 01/06/2023] Open
Abstract
Background Nitric oxide (NO) and cyclic guanosine phosphate (cGMP) play important roles in blood pressure regulation, neurotransmitter delivery, renal function, and tumorigenesis and development. The intermediate link of this signaling pathway, soluble guanylyl cyclase (sGC), is particularly important. However, the role of the GUCY1A2 gene encoding the sGC α2 subunit is unknown. Methods Gene expression and clinical data were obtained from The Cancer Genome Atlas (TCGA) database. After screening for GUCY1A2 expression, the expression differences between gastric cancer (GC) tissues and adjacent noncancerous tissues were determined using R software. Quantitative real-time polymerase chain reaction (qRT-PCR) and meta-analysis were used to verify the result. The correlation between the expression of GUCY1A2 and clinicopathological parameters was explored by logistic regression. Then, Kaplan-Meier survival analysis and the Cox proportional hazards regression were used to evaluate the relationship between the expression of GUCY1A2 and the survival of GC patients. Finally, gene set enrichment analysis (GSEA) was used to explore and analyze the GC-related signaling pathways affected by high GUCY1A2 expression. Results We found that GUCY1A2 was highly expressed in GC tissues compared to adjacent noncancerous tissues (P < 0.001). qRT-PCR (P < 0.001) and meta-analysis (SMD = 0.65, 95% CI: 0.20-1.10) confirmed the difference in GUCY1A2 expression. Logistic regression analysis showed that high expression of GUCY1A2 was associated with histological grade (OR=1.858 for poor vs. well or moderate, P = 0.004) and T stage (OR = 3.389 for T3 vs. T1, P = 0.025; OR = 3.422 for T4 vs. T1, P = 0.028). Kaplan-Meier curves indicated that GC patients with high expression of GUCY1A2 had a poor prognosis than that of patients with low expression. Univariate analysis indicated that GUCY1A2 and some clinicopathological parameters, such as age, pathological stage, and TNM stage, may predict poor prognosis. Multivariate analysis further confirmed that GUCY1A2 was an independent prognostic marker (HR = 1.699; 95%CI, 1.175-2.456; P = 0.005). GSEA showed that the high GUCY1A2 phenotype is significantly enriched for tumor-associated signaling pathways. Conclusions GUCY1A2 is highly expressed in GC and may be used as a potential prognostic marker.
Collapse
Affiliation(s)
- Xin Li
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Xiaowei Chen
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Xueju Hu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Yan Shen
- Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| | - Rui Xu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Leilei Wu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Xiaobing Shen
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China.,Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China
| |
Collapse
|
5
|
Fast Isolation of Flavonoids from the Endemic Species Nolana ramosissima I.M. Johnst and Its Endothelium-Independent Relaxation Effect in Rat Aorta. Molecules 2020; 25:molecules25030520. [PMID: 31991709 PMCID: PMC7036828 DOI: 10.3390/molecules25030520] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 01/15/2020] [Accepted: 01/19/2020] [Indexed: 12/20/2022] Open
Abstract
The infusion of the desertic plant Nolana ramosissima I.M. Johnst showed vascular smooth muscle relaxation in rat aorta and the presence of several phenolic compounds, which were detected by high resolution UHPLC-Orbitrap-HESI-MS. In addition, five flavonoids were rapidly isolated from a methanolic extract using high-performance counter-current chromatography (HPCCC). The N. ramosissima extract showed endothelium-independent relaxation effect in rat aorta. Sixty-one compounds were detected in the infusion, mainly glycosylated flavonoids, flavanones and several oxylipins, suggesting that a synergistic effect between the compounds in the extracts could be responsible for the relaxation activity. Vascular activity experiments were done in isolated organ bath. In rat aorta, a nitric oxide inhibitor did not prevent the relaxation effects of the extract; however, a selective guanylyl cyclase inhibitor partially blunted this effect. The compound 5,3′-dihydroxy-4′7-dimethoxyflavone presented higher relaxation effect than 100 μg/mL of N. ramosissima extract. The extract and the isolated metabolites from N. ramosissima can show relaxation effects on rat aorta by a mechanism that is independent of the endothelium.
Collapse
|
6
|
Romero F, Palacios J, Jofré I, Paz C, Nwokocha CR, Paredes A, Cifuentes F. Aristoteline, an Indole-Alkaloid, Induces Relaxation by Activating Potassium Channels and Blocking Calcium Channels in Isolated Rat Aorta. Molecules 2019; 24:molecules24152748. [PMID: 31362388 PMCID: PMC6695676 DOI: 10.3390/molecules24152748] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 05/08/2019] [Accepted: 05/11/2019] [Indexed: 11/16/2022] Open
Abstract
Alkaloids derived from plants have shown great medicinal benefits, and are often reported for their use in cardiovascular disease management. Aristotelia chilensis (Molina) Stuntz (Maqui) has shown important medicinal properties in traditional useage. In this study, we evaluated the effect of the indole-alkaloid aristoteline (ARI), isolated from leaves of Maqui, on vascular reactivity of isolated aortic rings from normotensive rats. ARI induced relaxation (100%) in a concentration-dependent manner in intact or denuded-endothelium aortic rings pre-contracted with phenylephrine (PE; 1 μM). However, a specific soluble guanylyl cyclase inhibitor (ODQ; 1 μM) significantly reduced the relaxation to ARI in aortic rings pre-contracted with PE. In the presence of ARI, the contraction induced by KCl or PE was significantly (p < 0.05) decreased. Interestingly, the potassium channel blockade with 10 μM BaCl2 (Kir), 10 μM glibenclamide (KATP), 1 mM tetraethylammonium (TEA; KCa1.1), or 1 mM 4-aminopyridine (4-AP; Kv) significantly (p < 0.05) reduced the ARI-induced relaxation. ARI significantly (p < 0.05) reduced the contractile response to agonist of CaV1.2 channels (Bay K8644; 10 nM), likely reducing the influx of extracellular calcium through plasma membrane. The mechanisms associated with this process suggest an activation of the potassium channels, a calcium-induced antagonism and endothelium independent vasodilation that possibly involves the nitric oxide-independent soluble guanylate cyclase pathway.
Collapse
Affiliation(s)
- Fernando Romero
- Vicerrectoría de Investigación y Postgrado, Programa de Doctorado en Ciencias Médicas, Universidad de la Frontera, Temuco 4780000, Chile.
| | - Javier Palacios
- Laboratorio de Bioquímica Aplicada, Departamento de Química y Farmacia, Facultad Ciencias de la Salud, Universidad Arturo Prat, Iquique 1110939, Chile.
| | - Ignacio Jofré
- Laboratorio de Neurociencias y Biología de Péptidos, Centro de Excelencia en Biotecnología de La Reproducción, Facultad de Medicina, Universidad de La Frontera, Temuco 4811230, Chile
| | - Cristian Paz
- Laboratorio de Productos Naturales y Descubrimiento de Fármacos, Departamento de Ciencias básicas, Universidad de La Frontera, Temuco 4811230, Chile
| | - Chukwuemeka R Nwokocha
- Department of Basic Medical Sciences Physiology Section, Faculty of Medical Sciences, The University of the West Indies, Mona, Kingston 7, KGN, Jamaica (W.I.)
| | - Adrián Paredes
- Laboratorio de Química Biológica, Instituto Antofagasta, Universidad de Antofagasta, Antofagasta 1270300, Chile
| | - Fredi Cifuentes
- Laboratorio de Fisiología Experimental, Instituto Antofagasta, Universidad de Antofagasta, Antofagasta 1270300, Chile
| |
Collapse
|
7
|
Wallace A, Gabriel D, McHale NG, Hollywood MA, Thornbury KD, Sergeant GP. Regulation of nerve-evoked contractions of rabbit vas deferens by acetylcholine. Physiol Rep 2015; 3:3/9/e12520. [PMID: 26359240 PMCID: PMC4600378 DOI: 10.14814/phy2.12520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Stimulation of intramural nerves in the vas deferens of many species yields a classical biphasic contraction comprised of an initial fast component, mediated by P2X receptors and a second slower component, mediated by α1-adrenoceptors. It is also recognized that sympathetic nerve-mediated contractions of the vas deferens can be modulated by acetylcholine (Ach), however there is considerable disagreement in the literature regarding the precise contribution of cholinergic nerves to contraction of the vas deferens. In this study we examined the effect of cholinergic modulators on electric field stimulation (EFS)-evoked contractions of rabbit vas deferens and on cytosolic Ca(2+) levels in isolated vas deferens smooth muscle cells (VDSMC). The sustained component of EFS-evoked contractions was inhibited by atropine and by the selective M3R antagonist, 1,1-dimethyl-4-diphenylacetoxypiperidinium iodide (4-DAMP). EFS-evoked contractions were potentiated by Ach, carbachol (Cch), and neostigmine. The sustained phase of the EFS-evoked contraction was inhibited by prazosin, an α1-adrenoceptor antagonist and guanethidine, an inhibitor of noradrenaline release, even in the continued presence of Ach, Cch or neostigmine. The soluble guanylate cyclase (sGC) inhibitor, 1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one enhanced the amplitude of EFS-evoked contractions and reduced the inhibitory effects of 4-DAMP. Isolated VDSMC displayed spontaneous Ca(2+) oscillations, but did not respond to Cch. However, the α1-adrenoceptor agonist, phenylephrine, evoked a Ca(2+) transient and contracted the cells. These data suggest that EFS-evoked contractions of the rabbit vas deferens are potentiated by activation of M3 receptors and reduced by activation of a sGC-dependent inhibitory pathway.
Collapse
Affiliation(s)
- Audrey Wallace
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| | - Deborah Gabriel
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| | - Noel G McHale
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| | - Mark A Hollywood
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| | - Keith D Thornbury
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| | - Gerard P Sergeant
- The Smooth Muscle Research Centre, Dundalk Institute of Technology, Dundalk, Co. Louth, Ireland
| |
Collapse
|
8
|
Kirecci SL, Simsek A, Gurbuz ZG, Mimaroglu S, Yuksel A, Vural P, Degirmencioglu S. Relationship between plasma melatonin levels and the efficacy of selective serotonin reuptake inhibitors treatment on premature ejaculation. Int J Urol 2014; 21:917-20. [DOI: 10.1111/iju.12461] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Accepted: 03/10/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Sinan Levent Kirecci
- Department of Urology; Sisli Etfal Research and Training Hospital; Istanbul Turkey
| | | | - Zafer Gokhan Gurbuz
- Department of Urology; Haseki Research and Training Hospital; Istanbul Turkey
| | - Saban Mimaroglu
- Department of Urology; Haseki Research and Training Hospital; Istanbul Turkey
| | - Alpaslan Yuksel
- Department of Urology; Faculty of Medicine; Baskent University; Ankara Turkey
| | - Pervin Vural
- Department of Pharmacology; Faculty of Medicine; Ankara University; Ankara Turkey
| | - Suzan Degirmencioglu
- Department of Pharmacology; Faculty of Medicine; Ankara University; Ankara Turkey
| |
Collapse
|
9
|
Kirecci SL, Simsek A, Yuksel A, Gurdal H, Gurbuz ZG, Usanmaz S. Relevance of seminal plasma nitric oxide levels and the efficacy of SSRI treatment on lifelong premature ejaculation. Andrologia 2013; 46:1169-75. [DOI: 10.1111/and.12210] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/03/2013] [Indexed: 01/23/2023] Open
Affiliation(s)
- S. L. Kirecci
- Department of Urology; Sisli Etfal Research and Training Hospital; Istanbul Turkey
| | - A. Simsek
- Department of Urology; Haseki Research and Training Hospital; Fatih Istanbul Turkey
| | - A. Yuksel
- Faculty of Medicine; Department of Urology; Baskent University; Ankara Turkey
| | - H. Gurdal
- Department of Pharmacology; Ankara University Faculty of Medicine; Ankara Turkey
| | - Z. G. Gurbuz
- Department of Urology; Haseki Research and Training Hospital; Fatih Istanbul Turkey
| | - S. Usanmaz
- Department of Pharmacology; Ankara University Faculty of Medicine; Ankara Turkey
| |
Collapse
|
10
|
Silva FH, Mónica FZ, Báu FR, Brugnerotto AF, Priviero FBM, Toque HA, Antunes E. Superoxide anion production by NADPH oxidase plays a major role in erectile dysfunction in middle-aged rats: prevention by antioxidant therapy. J Sex Med 2013; 10:960-71. [PMID: 23347406 DOI: 10.1111/jsm.12063] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
INTRODUCTION.: Prevalence of erectile dysfunction (ED) increases progressively with aging, but the ED pathophysiology at its early stages is still poorly investigated. AIM.: This study aimed to evaluate the functional and molecular alterations of erectile function at middle age, focusing on the contribution of oxidative stress in erectile tissue for the ED. METHODS.: Young (3.5-month) and middle-aged (10-month) male Wistar rats were used. Rat corpus cavernosum (RCC) was dissected free and mounted in 10-mL organ baths containing Krebs solution. Intracavernosal pressure (ICP) in anesthetized rats was evaluated. MAIN OUTCOME MEASURES.: Concentration-response curves to endothelium-dependent and endothelium-independent agents, as well as to electrical field stimulation (EFS), were obtained in RCC strips. Measurement of cyclic guanosine monophosphate (cGMP) and expressions of neuronal nitric oxide synthase (nNOS) and endothelial NOS (eNOS), gp91(phox) and superoxide dismutase-1 (SOD-1) expressions in RCC were evaluated. RESULTS.: ICP was significantly reduced in middle-aged compared with young rats. RCC relaxations to acetylcholine (10(-8) to 10(-2) M), sodium nitroprusside (10(-8) to 10(-2) M), sildenafil (10(-9) to 10(-5) M), BAY 41-2272 (10(-9) to 10(-5) M), and EFS (4-32 Hz) were decreased in middle-aged group, which were nearly normalized by apocynin (NADPH oxidase inhibitor; 10(-4) M) or SOD (75 U/mL). Prolonged treatment with apocynin (85 mg/rat/day, 4 weeks) also restored the impaired relaxations in middle-aged rats. Relaxations to 8-bromoguanosine 3',5'-cyclic monophosphate sodium salt (8-Br-cGMP; 10(-8) to 3 × 10(-4) M) remained unchanged between groups. Basal and stimulated cGMP production were lower in middle-aged group, an effect fully restored by apocynin and SOD. Protein expression of nNOS and phosphorylated eNOS (p-eNOS) (Ser-1177) reduced, whereas gp(91phox) mRNA expression increased in RCC from middle-aged rats. CONCLUSIONS.: ED in middle-aged rats is associated with decreased NO bioavailability in erectile tissue due to upregulation of NADPH oxidase subunit gp91(phox) and downregulation of nNOS/p-eNOS. Antioxidant therapies may be a good pharmacological approach to prevent ED at its early stages.
Collapse
Affiliation(s)
- Fábio H Silva
- Department of Pharmacology, Faculty of Medical Sciences, University of Campinas, Campinas, SP, Brazil
| | | | | | | | | | | | | |
Collapse
|