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Nwagwe OR, Adefegha SA, Oboh G. Antihyperglycemic and aphrodisiac effect of West African Albizia (Albizia zygia) leaves-inclusive diet in diabetes-induced erectile dysfunctional rats. JOURNAL OF ETHNOPHARMACOLOGY 2024; 321:117562. [PMID: 38081399 DOI: 10.1016/j.jep.2023.117562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 11/30/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE West African Albizia (Albizia zygia DC J. F. Macbr) leaves are a tropical plant that are frequently used in folkloric medicine to treat a number of illnesses, including type 2 diabetes (TY2D) and erectile dysfunction (ED), without having a complete scientific foundation. AIM OF THE STUDY This investigation examined the effect of action of dietary augmentation of Albizia zygia leaves (AZL) on rat sexual functioning and important enzymes related to TY2D and ED. MATERIALS AND METHODS Thirty matured adult Wistar rats of the weight 180-200 g were acclimatized in a lab environmental condition for two weeks prior to experiment given food and water to acclimate. Twenty-four of the rats got high fat diet (HFD) for periods of two weeks before receiving streptozotocin (STZ) intraperitoneally (i.p.), 35 mg/kg body weight single dose. Six rats got basal diets. Type 2 diabetes was identified in rats 72 h after STZ treatment. Rats were then used to evaluate the mounting number, mount delay, intromission number, and intromission latency. RESULTS Following that, meals supplemented with AZL (5% or 10% inclusion) were given to diabetic-ED rats for 14 days. AZL was added. Therefore, in diabetic-ED rats, AZL supplementation could significantly (p0.05) lower blood glucose levels and the activities of alpha amylase, alpha glucosidase, phosphodiesterase-5, and arginase. In the case of diabetic-ED treated rats in consideration with diabetic-ED control group, nitric oxide levels were increased along with sexual function. CONCLUSION Thus, experimental results of this study demonstrated rats that consumed AZL in their diets had less erectile dysfunction. In order to address ED caused by diabetes, AZL could be suggested as functional meals.
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Affiliation(s)
- Onyinyechi Ruth Nwagwe
- Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Department of Biochemistry, Federal University of Technology, P.M.B. 704, Akure, 340001, Nigeria.
| | - Stephen Adeniyi Adefegha
- Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Department of Biochemistry, Federal University of Technology, P.M.B. 704, Akure, 340001, Nigeria.
| | - Ganiyu Oboh
- Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Department of Biochemistry, Federal University of Technology, P.M.B. 704, Akure, 340001, Nigeria.
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Nwagwe OR, Adefegha SA, Oboh G. Pentaclethra macrophylla leaves reduce blood glucose level, improve sexual behavior and modulate critical enzymes associated with diabetes-erectile dysfunction morbidity in rats. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2024; 21:80-87. [PMID: 37974314 DOI: 10.1515/jcim-2023-0101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 10/14/2023] [Indexed: 11/19/2023]
Abstract
OBJECTIVES This research work studied the phenolic composition of Pentaclethra macrophylla (PM), the inclusion of dietary supplementation of PM leaves on sexual functions and its connection to inhibit enzymes (arginase and phosphodiesterase-5) and nitric oxide level, linked to type 2 diabetes-induced erectile dysfunction in rats. METHODS Gallic acid, chlorogenic and ellagic acids, Kaempferol, and epicatechin etc. was spotted with High performance liquid chromatography-diode array detector from PM extract. Twenty-five (25) rats were used for the study. Five rats were placed with basal diet; diets not supplemented with PM leaves (normal rat group) while twenty rats were made diabetic by feeding them with high fat diet for two weeks, prior to single injection with 35 mg/kg of streptozotocin (STZ). After checking with glucometer, experimental animals with blood glucose level >250 mg/dL were accepted as diabetic. The diabetic rats were subsequently divided into four groups of five rats each (n=5). The diabetic rats were placed on basal diet, or diets supplemented with PM leaves (10 % or 5 % inclusion) or sildenafil citrate (SC). RESULTS The result revealed that PM supplemented diets caused significant (p<0.05) reduction in blood glucose level, and augmented erectile function by inhibiting arginase and PDE5 activities as well as enhancing nitric oxide level. CONCLUSIONS In conclusion, dietary inclusion of PM leaves could serve as a potent nutraceutical source in hyperglycemia induced erectile dysfunction management.
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Affiliation(s)
- Onyinyechi Ruth Nwagwe
- Department of Biochemistry, Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Federal University of Technology, Akure, Nigeria
- Department of Biochemistry, Federal University Oye Ekiti, Oye, Nigeria
| | - Stephen Adeniyi Adefegha
- Department of Biochemistry, Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Federal University of Technology, Akure, Nigeria
| | - Ganiyu Oboh
- Department of Biochemistry, Functional Foods, Nutraceuticals and Phytomedicine Laboratory, Federal University of Technology, Akure, Nigeria
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Kim JH, Yang HJ, Park S, Lee HJ, Song YS. Differential Gene Expression in the Penile Cavernosum of Streptozotocin-Induced Diabetic Rats. Int Neurourol J 2023; 27:234-242. [PMID: 38171323 PMCID: PMC10762368 DOI: 10.5213/inj.2346074.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 06/01/2023] [Indexed: 01/05/2024] Open
Abstract
PURPOSE Men with diabetes mellitus (DM) often present with severe erectile dysfunction (ED). This ED is less responsive to current pharmacological therapies. If we know the upregulated or downregulated genes of diabetic ED, we can inhibit or enhance the expression of such genes through RNA or gene overexpression. METHODS To investigate gene changes associated with ED in type 1 DM, we examined the alterations of gene expression in the cavernosum of streptozotocin-induced diabetic rats. Specifically, we considered 11,636 genes (9,623 upregulated and 2,013 downregulated) to be differentially expressed in the diabetic rat cavernosum group (n=4) compared to the control group (n=4). The analysis of differentially expressed genes using the gene ontology (GO) classification indicated that the following were enriched: downregulated genes such as cell cycle, extracellular matrix, glycosylphosphatidylinositol-anchor biosynthesis and upregulated genes such as calcium signaling, neurotrophin signaling, apoptosis, arginine and proline metabolism, gap junction, transforming growth factor-β signaling, tight junction, vascular smooth muscle contraction, and vascular endothelial growth factor (VEGF) signaling. We examined a more than 2-fold upregulated or downregulated change in expression, using real time polymerase chain reaction. Analysis of differentially expressed genes, using the GO classification, indicated the enrichment. RESULTS Of the 41,105 genes initially considered, statistical filtering of the array analysis showed 9,623 upregulated genes and 2,013 downregulated genes with at least 2-fold changes in expression (P<0.05). With Bonferroni correction, SLC2A9 (solute carrier family 2 member 9), LRRC20 (leucine rick repeat containing 20), PLK1 (polo like kinase 1), and AATK (apoptosis-associated tyrosine kinase) were all 2-fold changed genes. CONCLUSION This study broadens the scope of candidate genes that may be relevant to the pathophysiology of diabetic ED. In particular, their enhancement or inhibition could represent a novel treatment for diabetic ED.
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Affiliation(s)
- Jae Heon Kim
- Department of Urology, Soonchunhyang University Seoul Hospital, Soonchunhyang University School of Medicine, Seoul, Korea
| | - Hee Jo Yang
- Department of Urology, Soonchunhyang University Cheonan Hospital, Soonchunhyang University School of Medicine, Cheonan, Korea
| | - Suyeon Park
- Department of Biostatistics, Soonchunhyang University School of Medicine, Seoul, Korea
| | - Hong Jun Lee
- College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Korea
- Research Institute, e-biogen Inc., Seoul, Korea
| | - Yun Seob Song
- Department of Urology, Soonchunhyang University Seoul Hospital, Soonchunhyang University School of Medicine, Seoul, Korea
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Solomon A, Negrea MO, Cipăian CR, Boicean A, Mihaila R, Rezi C, Cristinescu BA, Berghea-Neamtu CS, Popa ML, Teodoru M, Stoia O, Neamtu B. Interactions between Metabolic Syndrome, MASLD, and Arterial Stiffening: A Single-Center Cross-Sectional Study. Healthcare (Basel) 2023; 11:2696. [PMID: 37830733 PMCID: PMC10572783 DOI: 10.3390/healthcare11192696] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 10/06/2023] [Accepted: 10/07/2023] [Indexed: 10/14/2023] Open
Abstract
Metabolic-associated steatotic liver disease (MASLD), previously termed non-alcoholic fatty liver disease (NAFLD), has emerged as a prominent global cause of chronic liver disease and is increasingly recognized as associated with atherosclerotic vascular illness, consolidating its position along traditional cardiovascular risk factors. Individuals with MASLD exhibit a combination of metabolic syndrome risk factors, carotid atherosclerosis, and increased arterial stiffness, hinting at shared pathogenesis. In this study, we aim to explore liver involvement and arterial stiffness within metabolic syndrome. We enrolled 75 patients (30 male and 45 female) with either liver steatosis on conventional ultrasound, altered liver function tests, or the presence of cardiometabolic risk factors after excluding liver pathology other than MASLD. Clinical evaluation, laboratory measurements, abdominal and carotid ultrasounds, vibration-controlled transient elastography (VCTE, Fibroscan), and assessment with the Arteriograph (Tensiomed) were performed. The 26 patients diagnosed with MetS had significantly higher liver involvement as quantified via the hepatic steatosis index (HSI), Fibrosis-4 (FIB4), aspartate aminotransferase to platelet ratio index (APRI) category, and VCTE measurements, as well as Agile 3+ and Agile 4 scores which use a combination of clinical and laboratory parameters together with results obtained from VCTE to reflect the probability of advanced liver fibrosis or cirrhosis. Patients with MetS also exhibited more pronounced vascular involvement as quantified via arterial stiffness measurements and CIMT (carotid intima-media thickness). We applied a two-step clustering algorithm to enhance our analysis, which gave us pertinent insight into the interplay between metabolic syndrome elements and typologies of hepatic steatosis and arterial stiffness degrees. Notably, of the three obtained clusters, the cluster showing increased levels of hepatic steatosis and arterial stiffness also exhibited the highest prevalence of metabolic syndrome and its constituting components. The results have significant clinical implications, advocating for a comprehensive diagnostic approach when MetS or MASLD is suspected.
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Affiliation(s)
- Adelaida Solomon
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Mihai Octavian Negrea
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Călin Remus Cipăian
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Adrian Boicean
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Romeo Mihaila
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Cristina Rezi
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
| | | | | | - Mirela Livia Popa
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Minodora Teodoru
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Oana Stoia
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- County Clinical Emergency Hospital of Sibiu, 550245 Sibiu, Romania
| | - Bogdan Neamtu
- Faculty of Medicine, “Lucian Blaga” University, 550024 Sibiu, Romania; (A.S.); (C.R.C.); (A.B.); (R.M.); (C.R.); (M.L.P.); (M.T.); (O.S.); (B.N.)
- Department of Clinical Research, Pediatric Clinical Hospital Sibiu, 550166 Sibiu, Romania
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Cayetano-Alcaraz AA, Tharakan T, Chen R, Sofikitis N, Minhas S. The management of erectile dysfunction in men with diabetes mellitus unresponsive to phosphodiesterase type 5 inhibitors. Andrology 2023; 11:257-269. [PMID: 35929992 DOI: 10.1111/andr.13257] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 07/29/2022] [Indexed: 01/18/2023]
Abstract
INTRODUCTION Erectile dysfunction is associated with diabetes mellitus with an estimated prevalence of 52.5% in the diabetic population. The first-line therapy for erectile dysfunction is phosphodiesterase type 5 inhibitors, but data suggest that diabetic men may be less responsive than non-diabetic men. Thus, other treatments, including intracavernosal injections, intraurethral prostaglandin, vacuum erection devices and penile prosthetic surgery, should be considered in management of diabetic men with erectile dysfunction refractory to phosphodiesterase type 5 inhibitors. Furthermore, combination therapy of phosphodiesterase type 5 inhibitors and other oral treatments such as arginine or l-carnitine may have synergistic effects resulting in better outcomes. In addition, there are novel therapies such as low-intensity shockwave therapy and stem-cell therapy, which may also be effective in targeted treatment modalities. Furthermore, studies suggest that erectile dysfunction can be improved by targeting concurrent comorbidities or metabolic diseases such as depression, hypertension, hypogonadism, and dyslipidaemia. We present an evidence-based narrative review focusing on the management of erectile dysfunction in diabetic men who have not responded to phosphodiesterase type 5 inhibitors. CONCLUSIONS Both clinicians and patients should be aware of the different management options in diabetic patients who have not responded to phosphodiesterase type 5 inhibitors.
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Affiliation(s)
| | - Tharu Tharakan
- Department of Urology, Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, UK
| | - Runzhi Chen
- Faculty of Medicine, Imperial College London, London, UK
| | - Nikolaos Sofikitis
- Department of Urology, University of Ioannina School of Medicine, Ioannina, Greece
| | - Suks Minhas
- Department of Urology, Imperial College Healthcare NHS Trust, Charing Cross Hospital, London, UK
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Inyang KA, Edagha IA, Akpanyung EO, Edagha EI, Asuquo IE, Edem DO. Ocimum gratissimum Attenuates Diabetes-induced Biochemical and Histomorphological Gonado-alterations. SCIENTIFIC AFRICAN 2022. [DOI: 10.1016/j.sciaf.2022.e01222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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Jichitu A, Bungau S, Stanescu AMA, Vesa CM, Toma MM, Bustea C, Iurciuc S, Rus M, Bacalbasa N, Diaconu CC. Non-Alcoholic Fatty Liver Disease and Cardiovascular Comorbidities: Pathophysiological Links, Diagnosis, and Therapeutic Management. Diagnostics (Basel) 2021; 11:689. [PMID: 33921359 PMCID: PMC8069361 DOI: 10.3390/diagnostics11040689] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/09/2021] [Accepted: 04/11/2021] [Indexed: 02/06/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) has a growing prevalence in recent years. Its association with cardiovascular disease has been intensively studied, and certain correlations have been identified. The connection between these two entities has lately aroused interest regarding therapeutic management. In order to find the best therapeutic options, a detailed understanding of the pathophysiology that links (NAFLD) to cardiovascular comorbidities is needed. This review focuses on the pathogenic mechanisms that are behind these two diseases and on the therapeutic management available at this time.
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Affiliation(s)
- Alexandra Jichitu
- Clinical Emergency Hospital of Bucharest, 105402 Bucharest, Romania; (A.J.); (C.C.D.)
| | - Simona Bungau
- Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, 410028 Oradea, Romania;
| | - Ana Maria Alexandra Stanescu
- Department 5, Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania;
| | - Cosmin Mihai Vesa
- Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania; (C.M.V.); (C.B.)
| | - Mirela Marioara Toma
- Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, 410028 Oradea, Romania;
| | - Cristiana Bustea
- Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania; (C.M.V.); (C.B.)
| | - Stela Iurciuc
- Department of Cardiology, Faculty of Medicine, “Victor Babeş” University of Medicine and Pharmacy, 300041 Timisoara, Romania
| | - Marius Rus
- Department of Medical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, 410073 Oradea, Romania;
| | - Nicolae Bacalbasa
- Department 13, Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania;
- Department of Surgery, “Ion Cantacuzino” Clinical Hospital, 030167 Bucharest, Romania
| | - Camelia Cristina Diaconu
- Clinical Emergency Hospital of Bucharest, 105402 Bucharest, Romania; (A.J.); (C.C.D.)
- Department 5, Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania;
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Yin GN, Ock J, Choi MJ, Limanjaya A, Ghatak K, Song KM, Kwon MH, Suh JK, Ryu JK. Gene expression profiling of mouse cavernous endothelial cells for diagnostic targets in diabetes-induced erectile dysfunction. Investig Clin Urol 2021; 62:90-99. [PMID: 33258323 PMCID: PMC7801162 DOI: 10.4111/icu.20200119] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/24/2020] [Accepted: 06/08/2020] [Indexed: 12/14/2022] Open
Abstract
PURPOSE To investigate potential target genes associated with the diabetic condition in mouse cavernous endothelial cells (MCECs) for the treatment of diabetes-induced erectile dysfunction (ED). MATERIALS AND METHODS Mouse cavernous tissue was embedded into Matrigel, and sprouted cells were subcultivated for other studies. To mimic diabetic conditions, MCECs were exposed to normal-glucose (NG, 5 mmoL) or high-glucose (HG, 30 mmoL) conditions for 72 hours. An RNA-sequencing assay was performed to evaluate gene expression profiling, and RT-PCR was used to validate the sequencing data. RESULTS We isolated MCECs exposed to the two glucose conditions. MCECs showed well-organized tubes and dynamic migration in the NG condition, whereas tube formation and migration were significantly decreased in the HG condition. RNA-sequencing analysis showed that MCECs had different gene profiles in the NG and HG conditions. Among the significantly changed genes, which we classified into 14 major gene categories, we identified that aging-related (9.22%) and angiogenesis-related (9.06%) genes were changed the most. Thirteen genes from the two gene categories showed consistent changes on the RNA-sequencing assay, and these findings were validated by RT-PCR. CONCLUSIONS Our gene expression profiling studies showed that Cyp1a1, Gclm, Igfbp5, Nqo1, Il6, Cxcl5, Olr1, Ctgf, Hbegf, Serpine1, Cyr61, Angptl4, and Loxl2 may play a critical role in diabetes-induced ED through aging and angiogenesis signaling. Additional research is necessary to help us understand the potential mechanisms by which these genes influence diabetes-induced ED.
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Affiliation(s)
- Guo Nan Yin
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Jiyeon Ock
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Min Ji Choi
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Anita Limanjaya
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Kalyan Ghatak
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Kang Moon Song
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Mi Hye Kwon
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Jun Kyu Suh
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea
| | - Ji Kan Ryu
- Department of Urology, National Research Center for Sexual Medicine, Inha University School of Medicine, Incheon, Korea.
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Seppan P, Muhammed I, Mohammad ZIK, Sathyanathan SB. Pathobiology of ischiocavernosus and bulbospongiosus muscles in long-term diabetic male rats and its implication on erectile dysfunction. Aging Male 2020; 23:979-990. [PMID: 31368398 DOI: 10.1080/13685538.2019.1647160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVE To analyze pathobiology of ischiocavernosus (IC) and bulbospongiosus (BS) muscles in long-term diabetic male rats and its implication on erectile dysfunction (ED). METHODS Male rats were grouped into control and diabetic rats (received single injection of 60 mg/kg bw. of streptozotocin [STZ]). At 120th day, the animals were subjected to various analyses like serum hormone, penile reflex, electromyography of IC and BS muscles, after euthanasia IC and BS muscles were processed for morphological, histology, histometric analysis, immunostaining and immunoblotting synaptophysin, nNOS and NADPH diaphorase histochemistry. RESULTS Significant reduction in serum hormone level, penile reflex, reduced action potential or activity in both these muscles and wide range of histological alterations were observed in STZ rats. Muscles showed significant reduction in the diameter, volume and numerical density of the fiber in both muscles of STZ rats. Synaptophysin, nNOS and NADPH diaphorase were significantly reduced in diabetic animal IC and BS. CONCLUSION Severe neuromuscular circuitry alteration in IC and BS. Study concludes that degenerative changes in IC and BS may play a major role in ED in diabetic condition. Indicating diabetic-induced postsynaptic neuronal degeneration along with impaired motor action of the muscle and severe muscle degeneration affecting ED.
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Affiliation(s)
- Prakash Seppan
- Department of Anatomy, Dr. Arcot Lakshmanasamy Mudaliar Postgraduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu, India
| | - Ibrahim Muhammed
- Department of Anatomy, Dr. Arcot Lakshmanasamy Mudaliar Postgraduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu, India
| | - Zafar Iqbal Khan Mohammad
- Department of Anatomy, Dr. Arcot Lakshmanasamy Mudaliar Postgraduate Institute of Basic Medical Sciences, University of Madras, Chennai, Tamil Nadu, India
| | - Sathya Bharathy Sathyanathan
- Department of Electrical and Electronics Engineering, Loyola-ICAM College of Engineering and Technology, Chennai, Tamil Nadu, India
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Resveratrol treatment may preserve the erectile function after radiotherapy by restoring antioxidant defence mechanisms, SIRT1 and NOS protein expressions. Int J Impot Res 2018; 30:179-188. [PMID: 29973698 DOI: 10.1038/s41443-018-0042-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 04/23/2018] [Accepted: 05/09/2018] [Indexed: 12/30/2022]
Abstract
Radiotherapy (RT) for prostate cancer (PC) can cause erectile dysfunction (ED) by damaging neurovascular structures with oxidative stress. In this study, we evaluated the effects of resveratrol, an antioxidant, on post-RT ED. Fifty rats in five groups were evaluated; control (C), prostate-confined radiotherapy with short- and long-term vehicle or resveratrol treatment. Cavernosal tissues were obtained to analyze glutathione (GSH), nitric oxide (NO), cyclic guanosine monophosphate (cGMP), 8-hydroxy-2'-deoxy-guanosine (8-OHdG) levels and superoxide dismutase (SOD), caspase-3 activities, sirtuin-1, Foxo-3, nNOS, and eNOS protein expressions. Intracavernosal pressures (ICP) were measured for the long-term treatment group. In the RT + long-term vehicle treatment group, tissue GSH, NO, cGMP, and SOD activity were decreased while 8-OHdg levels and caspase-3 activities were increased. Radiotherapy caused a decrease in sirtuin-1, nNOS, and eNOS protein expressions. These parameters were reversed by resveratrol treatment. Foxo-3 protein expressions were unaltered in the RT + short-term vehicle treatment group and started to increase as a defense mechanism in the RT + long-term vehicle group; however, resveratrol treatment caused a significant increase in Foxo-3 expressions. Resveratrol preserved the metabolic pathways involved in erectile function and provided functional protection. Resveratrol can be used as a supplementary agent in patients undergoing radiotherapy to preserve erectile function.
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Oboh G, Adebayo AA, Ademosun AO. Effects of water extractable phytochemicals of mahogany (Swietenia macrophylla
) and axlewood (Anogeissus leiocarpus
) stem bark on some enzymes implicated in erectile dysfunction and type-2 diabetes. J Food Biochem 2017. [DOI: 10.1111/jfbc.12430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ganiyu Oboh
- Biochemistry Department, Functional Food and Nutraceutical Unit; Federal University of Technology; Akure P.M.B. 704 Nigeria
| | - Adeniyi A. Adebayo
- Biochemistry Department, Functional Food and Nutraceutical Unit; Federal University of Technology; Akure P.M.B. 704 Nigeria
| | - Ayokunle O. Ademosun
- Biochemistry Department, Functional Food and Nutraceutical Unit; Federal University of Technology; Akure P.M.B. 704 Nigeria
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Oboh G, Adebayo AA, Ademosun AO. Erection-stimulating, anti-diabetic and antioxidant properties of Hunteria umbellata and Cylicodiscus gabunensis water extractable phytochemicals. JOURNAL OF COMPLEMENTARY & INTEGRATIVE MEDICINE 2017; 15:/j/jcim.ahead-of-print/jcim-2016-0164/jcim-2016-0164.xml. [PMID: 28749782 DOI: 10.1515/jcim-2016-0164] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 05/24/2017] [Indexed: 01/03/2023]
Abstract
Background Herbs have been used as an aphrodisiac since ages. This study was designed to investigate the effects of Hunteria umbellata (HU) seeds and Cylicodiscus gabunensis (CG) stem barks aqueous extracts on key enzymes relevant to erectile dysfunction (phosphodiesterase-5 and arginase) and type-2 diabetes (α-amylase and α-glucosidase). Methods In ascertaining the erectogenic and antidiabetic properties of the extracts, the effects of the extracts on activities of some enzymes relevant to erectile dysfunction (arginase and phosphodiesterase-5) and type-2 diabetes (α-amylase and α-glucosidase) were determined. Antioxidant properties of the extracts were assessed through several antioxidant assays (DPPH˙, OH˙). Furthermore, their phenolic constituents were estimated and quantified using HPLC. Results The results revealed that both extracts inhibited α-amylase and α-glucosidase in a concentration-dependent manner. HU showed higher α-amylase (IC50=221.30 µg/mL) and α-glucosidase (IC50=184.35 µg/mL) inhibition than CG. Also, both extracts inhibited phosphodiesterase-5 and arginase in a dose-dependent manner in vitro; nevertheless, HU showed higher inhibition [phosphodiesterase-5 (IC50=539.72 µg/mL); arginase (41.53 µg/mL)] than CG [phosphodiesterase-5 (IC50=611.35 µg/mL); arginase (47.95 µg/mL)]. In addition, the extracts possess antioxidant properties through radical (DPPH and OH) scavenging and metal (Fe2+) chelating abilities. HPLC analysis of phenolic constituents revealed the abundance of gallic acid, chlorogenic acid, caffeic acid, ellagic acid and quercetin. Conclusions The ability of samples' extract to inhibit some of key enzymes relevant to erectile dysfunction and type-2 diabetes could render them cheap, natural and alternative therapy with erectogenic and antidiabetic potentials.
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Affiliation(s)
- Ganiyu Oboh
- Functional Food and Nutraceutical Unit, Biochemistry Department, Federal University of Technology, Akure, Nigeria
| | - Adeniyi A Adebayo
- Functional Food and Nutraceutical Unit, Biochemistry Department, Federal University of Technology, Akure, Nigeria
| | - Ayokunle O Ademosun
- Functional Food and Nutraceutical Unit, Biochemistry Department, Federal University of Technology, Akure, Nigeria
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Villela-Nogueira CA, Leite NC, Cardoso CRL, Salles GF. NAFLD and Increased Aortic Stiffness: Parallel or Common Physiopathological Mechanisms? Int J Mol Sci 2016; 17:ijms17040460. [PMID: 27104526 PMCID: PMC4848916 DOI: 10.3390/ijms17040460] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/08/2016] [Accepted: 03/21/2016] [Indexed: 12/20/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) has become the leading cause of chronic liver diseases worldwide. Liver inflammation and fibrosis related to NAFLD contribute to disease progression and increasing liver-related mortality and morbidity. Increasing data suggest that NAFLD may be linked to atherosclerotic vascular disease independent of other established cardiovascular risk factors. Central arterial stiffness has been recognized as a measure of cumulative cardiovascular risk marker load, and the measure of carotid-femoral pulse wave velocity (cf-PWV) is regarded as the gold standard assessment of aortic stiffness. It has been shown that increased aortic stiffness predicts cardiovascular morbidity and mortality in several clinical settings, including type 2 diabetes mellitus, a well-known condition associated with advanced stages of NAFLD. Furthermore, recently-published studies reported a strong association between NAFLD and increased arterial stiffness, suggesting a possible link in the pathogenesis of atherosclerosis and NAFLD. We sought to review the published data on the associations between NAFLD and aortic stiffness, in order to better understand the interplay between these two conditions and identify possible common physiopathological mechanisms.
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Affiliation(s)
- Cristiane A Villela-Nogueira
- Department of Internal Medicine, Medical School and University Hospital Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rua Croton 72, Rio de Janeiro 22750-240, Brazil.
| | - Nathalie C Leite
- Department of Internal Medicine, Medical School and University Hospital Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rua Croton 72, Rio de Janeiro 22750-240, Brazil.
| | - Claudia R L Cardoso
- Department of Internal Medicine, Medical School and University Hospital Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rua Croton 72, Rio de Janeiro 22750-240, Brazil.
| | - Gil F Salles
- Department of Internal Medicine, Medical School and University Hospital Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rua Croton 72, Rio de Janeiro 22750-240, Brazil.
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Kim JH, Lee HJ, Song YS. Mesenchymal stem cell-based gene therapy for erectile dysfunction. Int J Impot Res 2016; 28:81-7. [PMID: 26888355 DOI: 10.1038/ijir.2016.3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 10/17/2015] [Accepted: 11/23/2015] [Indexed: 12/12/2022]
Abstract
Despite the overwhelming success of PDE5 inhibitor (PDE5I), the demand for novel pharmacotherapeutic and surgical options for ED continues to rise owing to the increased proportion of elderly individuals in the population, in addition to the growing percentage of ED patients who do not respond to PDE5I. Surgical treatment of ED is associated with many complications, thus warranting the need for nonsurgical therapies. Moreover, none of the above-mentioned treatments essentially corrects, cures or prevents ED. Although gene therapy is a promising option, many challenges and obstacles such as local inflammatory response and random transgene expression, in addition to other safety issues, limit its use at the clinical level. The use of stem cell therapy alone also has many shortcomings. To overcome these inadequacies, many scientists and clinicians are investigating new gene and stem cell therapies.
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Affiliation(s)
- J H Kim
- Department of Urology, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Seoul, Korea
| | - H J Lee
- Biomedical Research Institute, Chung-Ang School of Medicine, Seoul, Korea
| | - Y S Song
- Department of Urology, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Seoul, Korea
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Abstract
Erectile dysfunction (ED) is a common complication of diabetes, affecting up to 75% of all diabetic men. Although the aetiology of diabetic ED is multifactorial, endothelial dysfunction is recognized as a mainstay in the pathophysiology of the disease. Endothelial dysfunction is induced by the detrimental actions of high glucose levels and increased oxidative stress on endothelial cells that make up the vascular lining. Besides directly injuring the endothelium, diabetes might also hamper vascular repair mechanisms of angiogenesis and vasculogenesis. These states exacerbate and maintain endothelial dysfunction, impairing vasorelaxation events and cavernosal blood perfusion, which are crucial for normal erectile function.
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Lacchini R, Tanus-Santos JE. Pharmacogenetics of erectile dysfunction: navigating into uncharted waters. Pharmacogenomics 2015; 15:1519-38. [PMID: 25303302 DOI: 10.2217/pgs.14.110] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Sildenafil and other PDE-5 inhibitors have revolutionized erectile dysfunction (ED) treatment. However, a significant number of patients do not respond or present adverse reactions to these drugs. While genetic polymorphisms may underlie this phenomenon, very little research has been undertaken in this research field. Most of the current knowledge is based on sildenafil, thus almost completely ignoring other important pharmacological therapies. Currently, the most promising genes with pharmacogenetic implications in ED are related to the nitric oxide and cGMP pathway, although other genes are likely to affect the responsiveness to treatment of ED. Nevertheless, the small number of studies available opens the possibility of further exploring other genes and phenotypes related to ED. This article provides a comprehensive overview of the genes being tested for their pharmacogenetic relevance in the therapy of ED.
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Affiliation(s)
- Riccardo Lacchini
- Department of Psychiatric Nursing & Human Sciences, Ribeirao Preto College of Nursing, University of Sao Paulo, Ribeirao Preto, Brazil
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Choi YS, Lee SK, Bae WJ, Kim SJ, Cho HJ, Hong SH, Lee JY, Hwang TK, Kim SW. Bariatric surgery improves the cavernosal neuronal, vasorelaxation, and contraction mechanisms for erectile dysfunction as result of amelioration of glucose homeostasis in a diabetic rat model. PLoS One 2014; 9:e104042. [PMID: 25137300 PMCID: PMC4138031 DOI: 10.1371/journal.pone.0104042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 07/09/2014] [Indexed: 01/14/2023] Open
Abstract
Background Bariatric surgery is an effective treatment option for both obesity and obesity-related type 2 diabetes mellitus (T2DM). However, little is known regarding the effects of bariatric surgery on erectile dysfunction among patients with T2DM. Therefore, we investigated whether bariatric surgery would lead to structural and biochemical changes in the corpus cavernosum. Material and Method Twenty-five male Otsuka Long-Evans Tokushima Fatty rats were assigned to either a control group (sham operation, n = 10) or a bariatric surgery group (gastric bypass surgery, n = 15). Four weeks after the operation, each group of rats was evaluated with an oral glucose tolerance test (OGTT). The penile intracavernous pressure was measured for erectile functional analysis. Histologic evaluation of the tissue was performed with Masson's trichrome staining. Endothelial nitric oxide synthase (eNOS), neuronal nitric oxide synthase (nNOS), Rho kinase, and 8-hydroxy-2-deoxyguanosine (8-OHdG) levels in the corpus cavernosum were assayed by using western blot and ELISA. Results The mean body weight of the bariatric surgery group was lower than the control group (p = 0.002). The postoperative OGTT result was lower in the bariatric surgery group than in the control group (p = 0.014), and this was lower than the preoperative value (p = 0.037). The intracavernous pressure/mean arterial pressure ratio was higher in the bariatric surgery group compared to the control group (p = 0.021), and a higher cavernosum smooth muscle/collagen ratio was observed in the bariatric surgery group compared to the control group (p = 0.025). Likewise, the expression of eNOS and nNOS was higher in bariatric surgery group than in the control group (p = 0.027 and p = 0.008, respectively). Decreased expression of Rho kinase and levels of 8-OHdG were observed in the bariatric surgery group (p = 0.032). Conclusion In this animal model, bariatric surgery appears to ameliorate T2DM-related metabolic dysfunction leading to structural and biochemical changes in the corpus cavernosum, and thus, results in improvement of erectile dysfunction associated with T2DM.
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Affiliation(s)
- Yong Sun Choi
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sang Kuon Lee
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Woong Jin Bae
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Su Jin Kim
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Hyuk Jin Cho
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sung-Hoo Hong
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Ji Youl Lee
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Tae-Kon Hwang
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sae Woong Kim
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
- * E-mail:
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Ouyang B, Sun X, Han D, Chen S, Yao B, Gao Y, Bian J, Huang Y, Zhang Y, Wan Z, Yang B, Xiao H, Songyang Z, Liu G, Zhang Y, Deng C. Human urine-derived stem cells alone or genetically-modified with FGF2 Improve type 2 diabetic erectile dysfunction in a rat model. PLoS One 2014; 9:e92825. [PMID: 24663037 PMCID: PMC3963968 DOI: 10.1371/journal.pone.0092825] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 02/26/2014] [Indexed: 12/19/2022] Open
Abstract
Aim The aim of this study was to determine the possibility of improving erectile dysfunction using cell therapy with either human urine-derived stem cells (USCs) or USCs genetically-modified with FGF2 in a type 2 diabetic rat model. Methods Human USCs were collected from 3 healthy donors. USCs were transfected with FGF2 (USCs-FGF2). Sixty-five SD male rats were divided into five groups (G). A control group of normal rats (G1, n = 10), and four other test groups of type 2 diabetic erectile dysfunction rats: PBS as a negative control (G2, n = 10), USCs (G3, n = 15), lentivirus-FGF2 (G4, n = 15), and USCs-FGF2 (G5, n = 15). Diabetes was induced in the rats via a high fat diet for 28 days and a subsequent intraperitoneal injection of streptozotocin (35 mg/kg). Erectile dysfunction was screened with apomorphine (100 μg/kg). Cell injections in the test groups (G2–G5) occurred directly into the corpora cavernosa. The implanted cells were tracked at 7 days (n = 5 animals/G) and 28 days (n = 10 animals/G) post injection. Mean arterial pressure (MAP), intracavernosal pressure (ICP), expression of endothelial markers (CD31, VEGF and eNOS), smooth muscle markers (desmin and smoothelin), histological changes and erectile function were assessed for each group. Results USCs expressed mesenchymal stem cell markers, and secreted a number of proangiogenic growth factors. USCs expressed endothelial cell markers (CD31 and vWF) after transfection with FGF2. Implanted USCs or USCs-FGF2 displayed a significantly raised ICP and ICP/MAP ratio (p<0.01) 28 days after intracavernous injection. Although few cell were detected within the implanted sites, histological and western blot analysis demonstrated an increased expression of endothelial and smooth muscle markers within the cavernous tissue following USC or USC-FGF2 injection. Conclusions The paracrine effect of USCs or USCs-FGF2 induced improvement of erectile function in type 2 diabetic rats by recruiting resident cells and increasing the endothelial expression and contents of smooth muscle.
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MESH Headings
- Adult
- Animals
- Diabetes Complications/genetics
- Diabetes Complications/metabolism
- Diabetes Complications/pathology
- Diabetes Complications/therapy
- Diabetes Mellitus, Experimental/genetics
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/pathology
- Diabetes Mellitus, Experimental/therapy
- Diabetes Mellitus, Type 2/genetics
- Diabetes Mellitus, Type 2/metabolism
- Diabetes Mellitus, Type 2/pathology
- Diabetes Mellitus, Type 2/therapy
- Erectile Dysfunction/genetics
- Erectile Dysfunction/metabolism
- Erectile Dysfunction/pathology
- Erectile Dysfunction/therapy
- Fibroblast Growth Factor 2/biosynthesis
- Fibroblast Growth Factor 2/genetics
- Heterografts
- Humans
- Male
- Rats
- Rats, Sprague-Dawley
- Stem Cell Transplantation
- Stem Cells/metabolism
- Stem Cells/pathology
- Transduction, Genetic
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Affiliation(s)
- Bin Ouyang
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Xiangzhou Sun
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Dayu Han
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Shenfu Chen
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Bing Yao
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Yong Gao
- Reproductive Medicine Center, the Key Laboratory for Reproductive Medicine of Guangdong Province, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Jun Bian
- Department of Urology, the Third Affiliated Hospital of Southern Medical University, Guangzhou, People's Republic of China
| | - Yanping Huang
- Shanghai Institute of Andrology, Renji Hospital Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, People's Republic of China
| | - Yadong Zhang
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Zi Wan
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Bin Yang
- Department of Urology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, People's Republic of China
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Haipeng Xiao
- Department of endocrinology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
| | - Zhou Songyang
- Key Laboratory of Gene Engineering of Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou, People's Republic of China
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, People's Republic of China
- Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Guihua Liu
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
- Department of Andrology, Center for Reproductive Medicine, the Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
- * E-mail: (GL); (YZ); (CD)
| | - Yuanyuan Zhang
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
- * E-mail: (GL); (YZ); (CD)
| | - Chunhua Deng
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People's Republic of China
- * E-mail: (GL); (YZ); (CD)
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Yilmaz D, Bayatli N, Un O, Kadowitz PJ, Sikka SC, Gur S. The Effect of Intracavernosal Avanafil, a Newer Phosphodiesterase-5 Inhibitor, on Neonatal Type 2 Diabetic Rats With Erectile Dysfunction. Urology 2014; 83:508.e7-12. [DOI: 10.1016/j.urology.2013.10.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 10/05/2013] [Accepted: 10/08/2013] [Indexed: 11/30/2022]
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Liu G, Sun X, Bian J, Wu R, Guan X, Ouyang B, Huang Y, Xiao H, Luo D, Atala A, Zhang Y, Deng C. Correction of diabetic erectile dysfunction with adipose derived stem cells modified with the vascular endothelial growth factor gene in a rodent diabetic model. PLoS One 2013; 8:e72790. [PMID: 24023647 PMCID: PMC3758339 DOI: 10.1371/journal.pone.0072790] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 07/12/2013] [Indexed: 02/07/2023] Open
Abstract
The aim of this study was to determine whether adipose derived stem cells (ADSCs) expressing vascular endothelial growth factor (VEGF) gene can improve endothelial function, recover the impaired VEGF signaling pathway and enhance smooth muscle contents in a rat diabetic erectile dysfunction (DED) model. DED rats were induced via intraperitoneal injection of streptozotocin (40 mg/kg), and then screened by apomorphine (100 µg/kg). Five groups were used (n = 12/group)-Group 1 (G1): intracavernous injection of lentivirus-VEGF; G2: ADSCs injection; G3: VEGF-expressing ADSCs injection; G4: Phosphate buffered saline injection; G1-G4 were DED rats; G5: normal rats. The mean arterial pressure (MAP) and intracavernosal pressure (ICP) were measured at days 7 and 28 after the injections. The components of the VEGF system, endothelial, smooth muscle, pericytes markers in cavernoursal tissue were assessed. On day 28 after injection, the group with intracavernosum injection of ADSCs expressing VEGF displayed more efficiently and significantly raised ICP and ICP/MAP (p<0.01) than those with ADSCs or lentivirus-VEGF injection. Western blot and immunofluorescent analysis demonstrated that improved erectile function by ADSCs-VEGF was associated with increased expression of endothelial markers (VEGF, VEGF R1, VEGF R2, eNOS, CD31 and vWF), smooth muscle markers (a-actin and smoothelin), and pericyte markers (CD146 and NG2). ADSCs expressing VEGF produced a therapeutic effect and restored erectile function in diabetic rats by enhancing VEGF-stimulated endothelial function and increasing the contents of smooth muscle and pericytes.
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Affiliation(s)
- Guihua Liu
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Xiangzhou Sun
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Jun Bian
- Department of Urology, The Third Affiliated Hospital of Southern Medical University, Guangzhou, People’s Republic of China
| | - Rongpei Wu
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Xuan Guan
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Bin Ouyang
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Yanping Huang
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Haipeng Xiao
- Department of endocrinology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
| | - Daosheng Luo
- Department of Urology, Dongguan People’s Hospital, Dongguan, People’s Republic of China
| | - Anthony Atala
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Yuanyuan Zhang
- Wake Forest Institute of Regenerative Medicine, Wake Forest University, Winston Salem, North Carolina, United States of America
| | - Chunhua Deng
- Department of Urology, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou, People’s Republic of China
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Kim SO, Lee HS, Ahn K, Park K. COMP-angiopoietin-1 promotes cavernous angiogenesis in a type 2 diabetic rat model. J Korean Med Sci 2013; 28:725-30. [PMID: 23678264 PMCID: PMC3653085 DOI: 10.3346/jkms.2013.28.5.725] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 02/25/2013] [Indexed: 11/20/2022] Open
Abstract
Cartilage oligomeric matrix protein-angiopoietin-1 (COMP-Ang1) is an angiogenic factor for vascular angiogenesis. The aim was to investigate the effect of an intracavernosal injection of COMP-Ang1 on cavernosal angiogenesis in a diabetic rat model. Male Otsuka Long-Evans Tokushima Fatty (OLETF) rats made up the experimental group (1 yr old) and Long-Evans Tokushima Otsuka (LETO) rats made up the control group. The experimental group was divided into vehicle only, 10 µg COMP-Ang1, and 20 µg COMP-Ang1. COMP-Ang1 was injected into the corpus cavernosum of the penis. After 4 weeks, the penile tissues of the rats were obtained for immunohistochemistry and Western blot analysis. The immunoreactivity of PECAM-1 and VEGF was increased in the COMP-Ang1 group compared with the vehicle only group. Moreover, the expression of PECAM-1 and VEGF was notably augmented in the 20 µg Comp Ang-1 group. In the immunoblotting study, the expression of PECAM-1 and VEGF protein was significantly less in the OLEFT rats than in the control LETO rats. However, this expression was restored to control level after intracavernosal injection of COMP-Ang1. These results show that an intracavernosal injection of COMP-Ang1 enhances cavernous angiogenesis by structurally reinforcing the cavernosal endothelium.
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Affiliation(s)
- Sun-Ouck Kim
- Department of Urology, Chonnam National University Medical School, Gwangju, Korea
- Sexual Medicine Research Center, Chonnam National University Medical School, Gwangju, Korea
| | - Hyun-Suk Lee
- Department of Urology, Chonnam National University Medical School, Gwangju, Korea
- Sexual Medicine Research Center, Chonnam National University Medical School, Gwangju, Korea
| | - Kyuyoun Ahn
- Department of Anatomy, Chonnam National University Medical School, Gwangju, Korea
- Sexual Medicine Research Center, Chonnam National University Medical School, Gwangju, Korea
| | - Kwangsung Park
- Department of Urology, Chonnam National University Medical School, Gwangju, Korea
- Sexual Medicine Research Center, Chonnam National University Medical School, Gwangju, Korea
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Liu H, Yu S, Zhang H, Xu J. Angiogenesis impairment in diabetes: role of methylglyoxal-induced receptor for advanced glycation endproducts, autophagy and vascular endothelial growth factor receptor 2. PLoS One 2012; 7:e46720. [PMID: 23056421 PMCID: PMC3463541 DOI: 10.1371/journal.pone.0046720] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 09/07/2012] [Indexed: 12/20/2022] Open
Abstract
Diabetes impairs physiological angiogenesis by molecular mechanisms that are not fully understood. Methylglyoxal (MGO), a metabolite of glycolysis, is increased in patients with diabetes. This study defined the role of MGO in angiogenesis impairment and tested the mechanism in diabetic animals. Endothelial cells and mouse aortas were subjected to Western blot analysis of vascular endothelial growth factor receptor 2 (VEGFR2) protein levels and angiogenesis evaluation by endothelial cell tube formation/migration and aortic ring assays. Incubation with MGO reduced VEGFR2 protein, but not mRNA, levels in a time and dose dependent manner. Genetic knockdown of the receptor for advanced glycation endproducts (RAGE) attenuated the reduction of VEGFR2. Overexpression of Glyoxalase 1, the enzyme that detoxifies MGO, reduced the MGO-protein adducts and prevented VEGFR2 reduction. The VEGFR2 reduction was associated with impaired angiogenesis. Suppression of autophagy either by inhibitors or siRNA, but not of the proteasome and caspase, normalized both the VEGFR2 protein levels and angiogenesis. Conversely, induction of autophagy either by rapamycin or overexpression of LC3 and Beclin-1 reduced VEGFR2 and angiogenesis. MGO increased endothelial LC3B and Beclin-1, markers of autophagy, which were accompanied by an increase of both autophagic flux (LC3 punctae) and co-immunoprecipitation of VEGFR2 with LC3. Pharmacological or genetic suppression of peroxynitrite (ONOO(-)) generation not only blocked the autophagy but also reversed the reduction of VEGFR2 and angiogenesis. Like MGO-treated aortas from normglycemic C57BL/6J mice, aortas from diabetic db/db and Akita mice presented reductions of angiogenesis or VEGFR2. Administration of either autophagy inhibitor ex vivo or superoxide scavenger in vivo abolished the reductions. Taken together, MGO reduces endothelial angiogenesis through RAGE-mediated, ONOO(-)dependent and autophagy-induced VEGFR2 degradation, which may represent a new mechanism for diabetic angiogenesis impairment.
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Affiliation(s)
- Hongtao Liu
- Section of Endocrinology, Department of Medicine, Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States of America
| | - Shujie Yu
- Section of Endocrinology, Department of Medicine, Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States of America
| | - Hua Zhang
- Section of Endocrinology, Department of Medicine, Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States of America
| | - Jian Xu
- Section of Endocrinology, Department of Medicine, Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, United States of America
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VEGF genetic polymorphisms affect the responsiveness to sildenafil in clinical and postoperative erectile dysfunction. THE PHARMACOGENOMICS JOURNAL 2012; 13:437-42. [DOI: 10.1038/tpj.2012.39] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 07/23/2012] [Accepted: 08/20/2012] [Indexed: 11/08/2022]
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Jesmin S, Zaedi S, Islam AMS, Sultana SN, Iwashima Y, Wada T, Yamaguchi N, Hiroe M, Gando S. Time-dependent alterations of VEGF and its signaling molecules in acute lung injury in a rat model of sepsis. Inflammation 2012; 35:484-500. [PMID: 21528367 DOI: 10.1007/s10753-011-9337-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Molecular mechanisms of sepsis-associated acute lung injury (ALI) are poorly defined. Since vascular endothelial growth factor (VEGF) is a potent vascular permeability and mitogenic factor, it might contribute to the development of ALI in sepsis. Thus, using lipopolysaccharide (LPS)-induced (15 mg/kg, intraperitoneal) endotoxemic rat model, we studied the timeline (1, 3, 6, and 10 h) of pulmonary VEGF expression and its signaling machinery. Levels of pulmonary VEGF and its angiogenic-mediating receptor, Flk-1, were downregulated by LPS in a time-dependent manner; levels of plasma VEGF and its permeability-mediating receptor, Flt-1, in contrast, was upregulated with time. In addition, blockade of Flt-1 could improve the downregulated pulmonary VEGF level and attenuate the elevated plasma and pulmonary levels of TNF-α, followed by improvement of arterial oxygenation and wet-to-dry weight ratio of the lung. Expression of signaling, pro- and or apoptotic factors after LPS administration were as follows: phosphorylated Akt, a downstream molecule was downregulated time dependently; endothelial nitric oxide synthase levels were significantly reduced; pro-apoptotic markers caspase 3 and Bax were upregulated whereas levels of Bcl-2 were downregulated. The present findings show that VEGF may play a role through the expression of Flt-1 in LPS-induced ALI. Moreover, downregulation of VEGF signaling cascade may account for LPS-induced apoptosis and impaired physiological angiogenesis in lung tissues, which in turn may contribute to the development of ALI induced by LPS.
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Affiliation(s)
- Subrina Jesmin
- Division of Gene Therapeutics, National Center for Global Health and Medicine, Tokyo, Japan
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Piao S, Kim IG, Lee JY, Hong SH, Kim SW, Hwang TK, Oh SH, Lee JH, Ra JC, Lee JY. Therapeutic effect of adipose-derived stem cells and BDNF-immobilized PLGA membrane in a rat model of cavernous nerve injury. J Sex Med 2012; 9:1968-79. [PMID: 22642440 DOI: 10.1111/j.1743-6109.2012.02760.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Cavernous nerve injury is the main reason for post-prostatectomy erectile dysfunction (ED). Stem cell and neuroprotection therapy are promising therapeutic strategy for ED. AIM To evaluate the therapeutic efficacy of adipose-derived stem cells (ADSCs) and brain-derived neurotrophic factor (BDNF) immobilized Poly-Lactic-Co-Glycolic (PLGA) membrane on the cavernous nerve in a rat model of post-prostatectomy ED. Methods. Rats were randomly divided into five groups: normal group, bilateral cavernous nerve crush injury (BCNI) group, ADSC (BCNI group with ADSCs on cavernous nerve) group, BDNF-membrane (BCNI group with BDNF/PLGA membrane on cavernous nerve) group, and ADSC/BDNF-membrane (BCNI group with ADSCs covered with BDNF/PLGA membrane on cavernous nerve) group. BDNF was controlled-released for a period of 4 weeks in a BDNF/PLGA porous membrane system. MAIN OUTCOME MEASURES Four weeks after the operation, erectile function was assessed by detecting the ratio of intra-cavernous pressure (ICP)/mean arterial pressure (MAP). Smooth muscle and collagen content were determined by Masson's trichrome staining. Neuronal nitric oxide synthase (nNOS) expression in the dorsal penile nerve was detected by immunostaining. Phospho-endothelial nitric oxide synthase (eNOS) protein expression and cyclic guanosine monophosphate (cGMP) level of the corpus cavernosum were quantified by Western blotting and cGMP assay, respectively. RESULTS In the ADSC/BDNF-membrane group, erectile function was significantly elevated, compared with the BCNI and other treated groups. ADSC/BDNF-membrane treatment significantly increased smooth muscle/collagen ratio, nNOS content, phospho-eNOS protein expression, and cGMP level, compared with the BCNI and other treated groups. CONCLUSIONS ADSCs with BDNF-membrane on the cavernous nerve can improve erectile function in a rat model of post-prostatectomy ED, which may be used as a novel therapy for post-prostatectomy ED.
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Affiliation(s)
- Shuyu Piao
- Department of Urology, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Castela Â, Soares R, Rocha F, Medeiros R, Ribeiro R, Monteiro C, Gomes P, Vendeira P, Virag R, Costa C. Differentially expressed angiogenic genes in diabetic erectile tissue - results from a microarray screening. Mol Genet Metab 2012; 105:255-62. [PMID: 22133301 DOI: 10.1016/j.ymgme.2011.11.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Accepted: 11/04/2011] [Indexed: 12/15/2022]
Abstract
Diabetes-induced metabolic derangements promote endothelial malfunction, contributing to erectile dysfunction (ED). However, it remains unclear which angiogenic molecular mechanisms are deregulated in diabetic corpus cavernosum (CC). We investigated early and late alterations in cavernosal angiogenic gene expression associated to diabetes. Angiogenic changes were assessed in penile tissue of streptozotocin-induced Wistar rats, in an early (2-week) and established stage (8-week) of diabetes. Differentially expressed genes were identified by microarrays and expression data validated by quantitative real-time PCR (qrt-PCR). At protein level, quantitative immunohistochemistry confirmed the arrays data and dual immunofluorescence for selected alterations and α-smooth muscle actin (α-SMA) identified the cellular location of target proteins. The selected differentially expressed genes were also evaluated in human non-diabetic and diabetic CC by quantitative immunolabeling. At 2-week diabetes there was no differential gene expression between non-diabetic and diabetic CC. At 8-week, 10 genes were found down-regulated in diabetics. The results were validated by qrt-PCR for the insulin-like growth factor-1 (Igf1) and the natriuretic peptide receptor-1 (Npr1) genes. Dual immunofluorescence for IGF-1/ α-SMA showed predominant localization of IGF-1 in SM. NPR-1 expression was diffuse and mostly present in trabecular fibroblasts and SM. Quantitative immunostaining confirmed the decreased expression of both proteins in diabetic tissues. Concordantly, we detected a significant reduction in IGF-1 and NPR-1 protein expressions in human diabetic samples. Microarray analysis identified 10 angiogenic-related molecules deregulated in CC of established diabetes. Among them, IGF-1 and NPR-1 were significantly down-regulated and might result in preventive/therapeutic targets for ED management.
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Affiliation(s)
- Ângela Castela
- Institute for Molecular and Cell Biology of the University of Porto, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal
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Adipose tissue-derived stem cell-seeded small intestinal submucosa for tunica albuginea grafting and reconstruction. Proc Natl Acad Sci U S A 2012; 109:2090-5. [PMID: 22308363 DOI: 10.1073/pnas.1113810109] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Porcine small intestinal submucosa (SIS) has been widely used in tunica albuginea (TA) reconstructive surgery. Adipose tissue-derived stem cells (ADSCs) can repair damaged tissue, augment cellular differentiation, and stimulate release of multiple growth factors. The aim of this rat study was to assess the feasibility of seeding ADSCs onto SIS grafts for TA reconstruction. Here, we demonstrate that seeding syngeneic ADSCs onto SIS grafts (SIS-ADSC) resulted in significant cavernosal tissue preservation and maintained erectile responses, similar to controls, in a rat model of bilateral incision of TA, compared with sham-operated animals and rats grafted with SIS graft (SIS) alone. In addition to increased TGF-β1 and FGF-2 expression levels, cross-sectional studies of the rat penis with SIS and SIS-ADSC revealed mild to moderate fibrosis and an increase of 30% and 40% in mean diameter in flaccid and erectile states, respectively. SIS grafting induced transcriptional up-regulation of iNOS and down-regulation of endothelial NOS, neuronal NOS, and VEGF, an effect that was restored by seeding ADCSs on the SIS graft. Taken together, these data show that rats undergoing TA incision with autologous SIS-ADSC grafts maintained better erectile function compared with animals grafted with SIS alone. This study suggests that SIS-ADSC grafting can be successfully used for TA reconstruction procedures and can restore erectile function.
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Annexin 1 protects against apoptosis induced by serum deprivation in transformed rat retinal ganglion cells. Mol Biol Rep 2011; 39:5543-51. [DOI: 10.1007/s11033-011-1358-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Accepted: 12/12/2011] [Indexed: 10/14/2022]
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Energy restriction and exercise modulate angiopoietins and vascular endothelial growth factor expression in the cavernous tissue of high-fat diet-fed rats. Asian J Androl 2011; 14:635-42. [PMID: 22138901 DOI: 10.1038/aja.2011.131] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The purpose of the current study was to evaluate the effect of a high-fat (HF) diet, energy restriction and exercise on the expression of vascular endothelial growth factor (VEGF), angiopoietin (Ang) 1 and 2, and their receptors in rat corpus cavernosum (CC). Male Wistar rats were fed ad libitum with an HF diet for 8 or 16 weeks. After 8 weeks of the HF diet, a group of rats was subjected to energy restriction with or without exercise for 8 weeks. Control animals had free access to standard diet for the same period. After euthanasia, blood was collected and the penises removed for immunofluorescence assays (VEGF, VEGF receptor (VEGFR) 1 and 2, Ang1, Ang2 and Tie2) and semiquantification of VEGF, VEGFR1, VEGFR2, Ang1, Ang2, Tie2, endothelial nitric oxide synthase (eNOS) and Akt/phospho-Akt by Western blotting. HF diet-fed rats exhibited lower high-density lipoprotein cholesterol (HDL-c) levels, higher systolic blood pressure and an increased atherogenic index. A significant increase in Ang2 expression in the CC was verified and coupled to a decrease in VEGF and VEGFRs. The Akt pathway was activated by the HF diet. Energy restriction and exercise increased eNOS expression and restored most HF diet-induced modifications except for VEGFR2 expression. These results emphasize the role of diet on vascular function regulation, demonstrating that cavernous imbalance of VEGF/VEGFRs and Angs/Tie2 systems occurs before serum lipid changes and obesity onset, antedating structural atherosclerotic features.
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Albersen M, Lin G, Fandel TM, Zhang H, Qiu X, Lin CS, Lue TF. Functional, metabolic, and morphologic characteristics of a novel rat model of type 2 diabetes-associated erectile dysfunction. Urology 2011; 78:476.e1-8. [PMID: 21624647 DOI: 10.1016/j.urology.2011.03.024] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 03/08/2011] [Accepted: 03/15/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVES To conduct a pilot study to investigate functional, metabolic, and penile morphologic changes in a novel model of lean DM2. Erectile dysfunction (ED) is a frequent sequela in patients with type 2 diabetes mellitus (DM2). METHODS Eight rats received a high-fat diet and 2 weeks later, 2 intraperitoneal injections of streptozotocin (STZ, 30 mg/kg). Five age-matched rats served as controls. Insulin challenge tests were performed at 6 and 12 weeks after induction of DM2. At 12 weeks, erectile function was tested by measurement of intracavernous pressure (ICP) increase upon cavernous nerve stimulation. Penile tissue and serum samples were harvested for histology and biochemistry, respectively. RESULTS A lean DM2 model was established as demonstrated by decreased insulin resistance, elevated nonfasting plasma glucose levels, hyperlipidemia, and decreased insulin concentration in the absence of obesity. ICP/mean arterial pressure was significantly decreased in DM2 animals (0.29) compared with controls (0.81). Expression of neuronal nitric oxide synthase and rat endothelial cell antigen-1, and the smooth muscle/collagen ratio were significantly decreased in the penis of DM2 animals. CONCLUSIONS We propose an inexpensive nongenetic animal model of lean DM2-associated ED. Microanatomical changes in the erectile tissue that reflect an advanced stage of the disease were observed.
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Affiliation(s)
- Maarten Albersen
- Knuppe Molecular Urology Laboratory, Department of Urology, University of California, San Francisco, CA, USA.
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Li WJ, Zhou J, Li B, Wang H, Peng YB, Wang Z. PARP Inhibition Restores Erectile Function by Suppressing Corporal Smooth Muscle Apoptosis in Diabetic Rats. J Sex Med 2011; 8:1072-82. [DOI: 10.1111/j.1743-6109.2010.02176.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Liu G, Sun X, Dai Y, Zheng F, Wang D, Huang Y, Bian J, Deng C. Chronic administration of sildenafil modified the impaired VEGF system and improved the erectile function in rats with diabetic erectile dysfunction. J Sex Med 2011; 7:3868-78. [PMID: 20487237 DOI: 10.1111/j.1743-6109.2010.01844.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
INTRODUCTION Men frequently develop diabetic erectile dysfunction (DMED), as a result of endothelial dysfunction. DMED patients often have reduced efficacy with phosphodiesterase type 5 inhibitors therapy. AIM To determine whether chronic sildenafil administration can modify the impaired vascular endothelial growth factor (VEGF) system and improve the erectile function in rats with diabetic erectile dysfunction. METHODS A group of Sprague Dawley rats (n = 30) with DMED were induced by intraperitoneal injection of streptozotocin (40 mg/kg) and screened by subcutaneous injection of Apomorphine (100 mg/kg). They were then exposed to either vehicle or sildenafil (prescribed in our hospital, 5 mg/kg and 10 mg/kg, respectively) for 10 weeks. An additional nondiabetic and age-matched control group (n = 10) was also allocated and given the routine diet for the same period. Assessments were performed to both groups at 36 hours after the last dose of sildenafil. Penile intracavernous pressure (ICP), mean arterial pressure (MAP), penile tissue morphology, immunohistologic analysis, and Western blot analysis of VEGF, VEGFR1, and eNOS were determined. MAIN OUTCOME MEASURE Functional, morphological, and proteomical changes on penile structures by the chronic Sildenafil (5 mg/kg and 10 mg/kg, respectively) administration were determined. RESULTS A significant increase of ICP, ICP/MAP ratio, and area under the curve were observed in the both groups treated by sildenafil (5 mg/kg and 10 mg/kg, respectively), compared with the DMED rats without receiving Sildenafil. Immunohistochemical staining of their penile tissue showed a decrease in VEGF, VEGFR1, and eNOS staining in the controlled group compared with an improvement in the chronic sildenafil administration group. Western blot analysis demonstrated exactly the same results. CONCLUSION We demonstrated that daily sildenafil administration can restore the impaired VEGF system in the penis of DMED rats and progressively improve both erectile function and endothelial function, suggesting a potential general mechanism of improved signaling through the VEGF/eNOS signaling cascade.
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Affiliation(s)
- Guihua Liu
- Department of Urology, First Affiliated Hospital of Sun Yet-Sen University, Guangzhou, China
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Suresh S, Prakash S. Effect of Mucuna pruriens (Linn.) on oxidative stress-induced structural alteration of corpus cavernosum in streptozotocin-induced diabetic rat. J Sex Med 2011; 8:1943-56. [PMID: 21366877 DOI: 10.1111/j.1743-6109.2011.02221.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Erectile dysfunction is one of the major secondary complications of diabetes. Mucuna pruriens (M. pruriens), a leguminous plant identified for its antidiabetic, aphrodisiac, and fertility enhancing properties, has been the choice of Indian traditional medicine. AIM The objective of the present study was to analyze the efficacy of M. pruriens on free radicals-mediated penile tissue alterations in hyperglycemic male rats. Methods. Male albino rats were divided as group I (sham) control, group II (STZ) diabetes-induced (streptozotocin 60 mg/kg of body weight [bw] in 0.1 M citrate buffer), group III (STZ + MP) diabetic rats administered with 200 mg/kg bw of ethanolic extract of M. pruriens seed, group IV (STZ + SIL) diabetic rats administered with 5 mg/kg bw of sildenafil citrate, group V (sham + MP) administered with 200 mg/kg bw of extract alone, and group VI (sham + SIL) administered with 5 mg/kg bw of sildenafil citrate. The M. pruriens and sildenafil citrate were given (gavage) once daily for a period of 60 days. At the end of 60 days, the animals were sacrificed and subjected to analysis of reactive oxygen species levels, enzymic and nonenzymic antioxidant levels, levels of NOx, histological, and histomorphometrical study of penile tissue. MAIN OUTCOME MEASURES Remedial use of M. pruriens seed extract on diabetes-induced erectile tissue damage. RESULTS Significantly high levels of oxidative stress and low levels of antioxidants in the penile tissue seem to contribute to the increased collagen deposition and fibrosis of erectile tissue in STZ rats. Relatively, there was increased damage in STZ + SIL group. Supplementation of M. pruriens in STZ + MP group has revealed the potency to overcome oxidative stress, and good preservation of penile histoarchitecture. CONCLUSION The ethanolic extract of M. pruriens seed significantly recovered or protected erectile tissue from the oxidative stress-induced degeneration by its antioxidant potentials. These findings propound to serve mankind by the treatment of diabetes-induced erectile dysfunction.
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Affiliation(s)
- Sekar Suresh
- Department of Anatomy, Dr Arcot Lakshmanasamy Mudaliar Postgraduate Institute of Basic Medical Sciences, University of Madras, Chennai, India
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Jin HR, Kim WJ, Song JS, Piao S, Tumurbaatar M, Shin SH, Choi MJ, Tuvshintur B, Song KM, Kwon MH, Yin GN, Koh GY, Ryu JK, Suh JK. Intracavernous delivery of synthetic angiopoietin-1 protein as a novel therapeutic strategy for erectile dysfunction in the type II diabetic db/db mouse. J Sex Med 2011; 7:3635-46. [PMID: 20584113 DOI: 10.1111/j.1743-6109.2010.01925.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Patients with erectile dysfunction (ED) associated with type II diabetes often have impaired endothelial function and tend to respond poorly to oral phosphodiesterase type 5 inhibitors. Therefore, neovascularization is a promising strategy for curing diabetic ED. AIM To determine the effectiveness of a soluble, stable, and potent angiopoietin-1 (Ang1) variant, cartilage oligomeric matrix protein (COMP)-Ang1, in promoting cavernous angiogenesis and erectile function in a mouse model of type II diabetic ED. Methods. Sixteen-week-old male db/db mice (in which obesity and type II diabetes are caused by a mutation in the leptin receptor) and control C57BL/6J mice were used and divided into four groups (N=14 per group): age-matched controls; db/db mice receiving two successive intracavernous injections of phosphate-buffered saline (PBS) (days -3 and 0; 20 µL); db/db mice receiving a single intracavernous injection of COMP-Ang1 protein (day 0; 5.8 µg/20 µL); and db/db mice receiving two successive intracavernous injections of COMP-Ang1 protein (days -3 and 0; 5.8 µg/20 µL). MAIN OUTCOME MEASURES Two weeks later, erectile function was measured by electrical stimulation of the cavernous nerve. The penis was then harvested and stained with antibodies to platelet/endothelial cell adhesion molecule-1 (PECAM-1) (endothelial cell marker), phosphohistone H3 (PH3, a nuclear protein indicative of cell proliferation), phospho-endothelial nitric oxide synthase (eNOS), and eNOS. Penis specimens from a separate group of animals were used for cyclic guanosine monophosphate (cGMP) and cyclic adenosine monophosphate (cAMP) quantification. RESULTS Local delivery of COMP-Ang1 protein significantly increased eNOS phosphorylation and cGMP and cAMP expression compared with that in the group treated with PBS. Repeated intracavernous injections of COMP-Ang1 protein completely restored erectile function and cavernous endothelial content through enhanced cavernous neoangiogenesis as evaluated by PECAM-1 and PH3 immunohistochemistry and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end labeling assay, whereas a single injection of COMP-Ang1 protein elicited partial improvement. CONCLUSION Cavernous neovascularization using recombinant Ang1 protein is a novel therapeutic strategy for the treatment of ED resulting from type II diabetes.
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Affiliation(s)
- Hai-Rong Jin
- National Research Laboratory of Regenerative Sexual Medicine and Department of Urology, Inha University School of Medicine, Incheon, Korea
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Li WJ, Park K, Paick J, Kim SW. Chronic Treatment with an Oral Rho‐Kinase Inhibitor Restores Erectile Function by Suppressing Corporal Apoptosis in Diabetic Rats. J Sex Med 2011; 8:400-10. [DOI: 10.1111/j.1743-6109.2010.01724.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Carneiro FS, Giachini FRC, Carneiro ZN, Lima VV, Ergul A, Webb RC, Tostes RC. Erectile dysfunction in young non-obese type II diabetic Goto-Kakizaki rats is associated with decreased eNOS phosphorylation at Ser1177. J Sex Med 2010; 7:3620-34. [PMID: 20807325 DOI: 10.1111/j.1743-6109.2010.02000.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
INTRODUCTION Diabetes mellitus (DM) is a risk factor for erectile dysfunction (ED). Although type 2 DM is responsible for 90-95% diabetes cases, type 1 DM experimental models are commonly used to study diabetes-associated ED. AIM Goto-Kakizaki (GK) rat model is relevant to ED studies since the great majority of patients with type 2 diabetes display mild deficits in glucose-stimulated insulin secretion, insulin resistance, and hyperglycemia. We hypothesized that GK rats display ED which is associated with decreased nitric oxide (NO) bioavailability. METHODS Wistar and GK rats were used at 10 and 18 weeks of age. Changes in the ratio of intracavernosal pressure/mean arterial pressure (ICP/MAP) after electrical stimulation of cavernosal nerve were determined in vivo. Cavernosal contractility was induced by electrical field stimulation (EFS) and phenylephrine (PE). In addition, nonadrenergic-noncholinergic (NANC)- and sodium nitroprusside (SNP)-induced relaxation were determined. Cavernosal neuronal nitric oxide synthase (nNOS) and endothelial nitric oxide synthase (eNOS) mRNA and protein expression were also measured. MAIN OUTCOME MEASURE GK diabetic rats display ED associated with decreased cavernosal expression of eNOS protein. RESULTS GK rats at 10 and 18 weeks demonstrated impaired erectile function represented by decreased ICP/MAP responses. Ten-week-old GK animals displayed increased PE responses and no changes in EFS-induced contraction. Conversely, contractile responses to EFS and PE were decreased in cavernosal tissue from GK rats at 18 weeks of age. Moreover, GK rats at 18 weeks of age displayed increased NANC-mediated relaxation, but not to SNP. In addition, ED was associated with decreased eNOS protein expression at both ages. CONCLUSION Although GK rats display ED, they exhibit changes in cavernosal reactivity that would facilitate erectile responses. These results are in contrast to those described in other experimental diabetes models. This may be due to compensatory mechanisms in cavernosal tissue to overcome restricted pre-penile arterial blood supply or impaired veno-occlusive mechanisms.
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Garcia MM, Fandel TM, Lin G, Shindel AW, Banie L, Lin CS, Lue TF. Treatment of erectile dysfunction in the obese type 2 diabetic ZDF rat with adipose tissue-derived stem cells. J Sex Med 2010; 7:89-98. [PMID: 20104670 DOI: 10.1111/j.1743-6109.2009.01541.x] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Erectile dysfunction (ED) is a major complication of type 2 diabetes, and many diabetic men with ED are refractory to common ED therapies. AIM To determine whether autologous adipose tissue-derived stem cells (ADSCs) injected into the penis of impotent type 2 diabetic rats improve erectile function. MAIN OUTCOME MEASURES Blood glucose levels, intracavernous pressure (ICP) increase upon cavernous nerve (CN) electrostimulation, and immunohistochemistry. METHODS Twenty-two male Zucker diabetic fatty (ZDF) rats were used. At 22 weeks of age, all the animals underwent unilateral CN electrostimulation and ICP measurement to confirm impotence. Paragonadal adipose tissue was harvested to procure ADSCs. The impotent animals were randomized to ADSC treatment and sham control groups. At 23 weeks of age, the treatment group animals underwent a penile injection of 1 million ADSCs; the control group animals received vehicle only. Erectile function studies were repeated at 26 weeks of age, followed by tissue harvest. RESULTS The rats developed diabetes within the first 10 weeks of age. At 22 weeks of age, 20 out of the 22 rats presented with ED. The post-treatment ICP increase during CN stimulation and ICP increase/mean arterial pressure were significantly higher in the treatment group compared with controls. Three weeks after injection into the corpus cavernosum, only a small number of BrdU-labeled ADSCs was detectable within corporal tissue of the treatment group. There was a significant increase in neuronal nitric oxide synthase (nNOS) in the penile dorsal nerve and in the number of endothelial cells in the corpora cavernosa of the rats in the treatment group. CONCLUSION Autologous ADSCs injected into the penis were effective to improve erectile function and to alter the microarchitecture of the corpus cavernosum. Since the number of ADSCs retained in the corpus cavernosum is very small, we postulate that their paracrine function, not trans-differentiation to smooth muscle or endothelial cells, is responsible for the improvement in penile function.
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Affiliation(s)
- Maurice M Garcia
- Department of Urology, University of California School of Medicine-Knuppe Molecular Urology Laboratory, San Francisco, CA 94143-0738, USA.
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Galiano M, Pignot G, Costa C, Vallancien G, Virag R. Dysfonction érectile et cellules endothéliales caverneuses. Prog Urol 2010; 20:188-93. [DOI: 10.1016/j.purol.2009.07.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2009] [Revised: 07/07/2009] [Accepted: 07/27/2009] [Indexed: 10/20/2022]
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Chiou WF, Liu HK, Juan CW. Abnormal protein expression in the corpus cavernosum impairs erectile function in type 2 diabetes. BJU Int 2009; 105:674-80. [PMID: 19751257 DOI: 10.1111/j.1464-410x.2009.08852.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To investigate the changes in corporal relaxation, intracavernous pressure (ICP) and associated protein expression that control normal erectile function in rats with type 2 diabetes (T2D), as this disease is part of the 'metabolic syndrome' associated with a high rate of erectile dysfunction (ED) in men, resulting from failure of corpus cavernosum-mediated processes. MATERIALS AND METHODS T2D was induced in rats by feeding them with a high-fat diet (HFD) followed by an injection with low-dose streptozotocin (STZ); they were then compared with rats that received a normal diet (ND). RESULTS Hyperglycaemia and dyslipidaemia were induced in HFD + STZ rats, suggesting that T2D was established. The rats with T2D had associated ED, as both nonadrenergic noncholinergic-mediated corporal relaxation and increased ICP by cavernous nerve stimulation were significantly attenuated compared to the ND group. Western blot analysis revealed diabetes-associated lower expression of endothelial and neuronal nitric oxide synthase (e and nNOS), and cGMP-dependent protein kinase (PKG)-1alpha/beta expression in penile tissue than in the ND group. Contrary to the proteins that regulate corporal relaxation, there were relatively high levels of RhoA/Rho kinase receptor 1 (ROCK1) and ET-A receptor (ETAR) in T2D rats. However, the expressed level of phosphodiesterase-5 and insulin-like growth factor binding protein 3 was not altered significantly in response to T2D. CONCLUSION Decreased expression of certain proteins that mediate the relaxant mechanism, associated with increased expression of certain proteins that mediate contractile mechanisms, might be important in the development of T2D-associated ED. In particular, down-regulated eNOS/nNOS/PKG1 as well as up-regulated ETAR/RhoA/ROCK1 might participate in the aetiology of ED in T2D.
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Affiliation(s)
- Wen-Fei Chiou
- National Research Institute of Chinese Medicine, Taipei, Taiwan.
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Chitaley K. Type 1 and Type 2 diabetic-erectile dysfunction: same diagnosis (ICD-9), different disease? J Sex Med 2009; 6 Suppl 3:262-8. [PMID: 19267848 DOI: 10.1111/j.1743-6109.2008.01183.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Although hyperglycemia is a common defining feature of both type 1 and type 2 diabetes, many unique characteristics distinguish these diseases, including insulin and lipid levels, obesity status, and inflammatory agent profiles. In the laboratory, the presence of erectile dysfunction (ED) has been established in animal models of both type 1 and type 2 diabetes. AIM The purpose of this study was to determine whether unique mechanisms underlie ED in type 1 vs. type 2 diabetic animal models. MAIN OUTCOME MEASURES Many mechanisms can underlie ED, including impaired dilatory signaling, heightened contractile sensitivity, and veno-occlusive disorder. METHODS Using PubMed, the literature was mined to evaluate what is known about which mechanism underlie ED in type 1 vs. type 2 diabetic animal models. RESULTS Impaired cavernosal vasodilation has been established in type 1 diabetic rodents. This dysfunction appears to be mediated by a severe defect in non-adrenergic-non-cholinergic nerve signaling, as well as impairment in penile endothelial function. In contrast, type 2 diabetic animals appear to have minimal impairment in parasympathetic-mediated dilatory function, but do have evidence of endothelial dysfunction. Type 2 diabetic models also exhibit a significant and striking increase in cavernosal contractile sensitivity, and a significant veno-occlusive disorder, neither of which is consistently reported in type 1 diabetic animals. CONCLUSIONS With the distinct mechanisms underlying the ED phenotype in animal models of type 1 and type 2 diabetes, tailoring therapeutic treatments for diabetic-ED to the specific mechanisms underlying this disease complication may be warranted. Further examination of mechanisms underlying ED in diabetic human patients may thus lead to significant changes in the way urologists diagnose, code, and treat diabetic-ED.
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Affiliation(s)
- Kanchan Chitaley
- University of Washington, Department of Urology, Seattle, WA 98109, USA.
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Masuzawa K, Goto K, Jesmin S, Maeda S, Miyauchi T, Kaji Y, Oshika T, Hori S. An Endothelin Type A Receptor Antagonist Reverses Upregulated VEGF and ICAM-1 Levels in Streptozotocin-Induced Diabetic Rat Retina. Curr Eye Res 2009; 31:79-89. [PMID: 16421022 DOI: 10.1080/02713680500478923] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Diabetic retinopathy, a cause of blindness, is often associated with the upregulation of vascular endothelial growth factor (VEGF) in the retina. Recently, leukocyte adhesion (leukostasis) is claimed for the occlusion of retinal capillary vascularity, which ultimately assists in the progression of diabetic retinopathy. In addition, intercellular adhesion molecule-1 (ICAM-1), a representative factor for leukostasis, is increased in diabetic retina. Endothelin (ET)-1, a potent vasoconstrictor peptide, is closely linked to the pathogenesis of diabetic retinopathy. Different therapeutic interventions concerning VEGF have already been proposed to prevent diabetic retinopathy. However, no study has yet reported concerning the effects of ET-1 receptor antagonist on the upregulated VEGF and ICAM-1 in morphologically intact diabetic retina. The current study investigated the effect of ET(A) receptor antagonist (TA-0201; 1 mg kg(-1) day(-1)) on the expressions of VEGF and ICAM-1 in rat diabetic retina. Diabetes was induced by intraperitoneal injection of streptozotocin (70 mg/kg) in Sprague-Dawley rats, whereas control rats (Cont) received only citrate buffer. After 1 week, the streptozotocin-administered rats were randomly divided into two groups: ET(A) receptor antagonist-treated group (DM+TA-0201) and saline-treated group (DM+vehicle). After the treatment for 4 weeks, the retina was removed from the eyeball. In DM+vehicle group, the VEGF expression of retina was significantly increased (33.5 pg/mg) in comparison with that in the Cont group (25.1 pg/mg), and the upregulation of VEGF was reversed in DM+TA-0201 group (26.9 pg/mg), a phenomenon consistent with the change in VEGF mRNA levels. The expression of retinal ICAM-1 was increased in DM+vehicle group (55.1 pg/mg) compared with Cont group (43.8 pg/mg), and ET antagonism completely blocked this increase (43.8 pg/mg). Moreover, an increased leukostasis by 3.3-fold in DM+vehicle retina was returned to the control level by ET antagonism. In the current study, there was no obvious retinal morphological alteration from both the hematoxylin and eosin staining and the FITC-dextran angiography. Thus, ET(A) receptor antagonist might be useful in preventing the progression of diabetic retinopathy, as evidenced by suppressing the increase in VEGF and ICAM-1 levels as well as leukostasis in morphologically intact diabetic retina.
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Affiliation(s)
- Koichi Masuzawa
- Department of Pharmacology, Institute of Basic Medical Sciences, University of Tsukuba, Ibaraki, Japan
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Abstract
INTRODUCTION The endothelial monolayer plays a crucial role in the vasodilation and hemodynamic events involved in erection physiology. Due to its relevant functions, a close link has been established between endothelial integrity and erectile dysfunction (ED). Endothelial dysfunction is induced by the detrimental actions of vascular risk factors (VRFs), identified as common correlates for the development of cardiovascular disease and ED. It is currently recognized that ED is the early harbinger of a more generalized vascular systemic disorder, and, therefore, an evaluation of endothelial health in ED patients should be of prime relevance. Several noninvasive methods for endothelial function assessment have been proposed, including the Penile Nitric Oxide Release Test (PNORT). AIM To highlight the most recent gathered knowledge on basic and clinical mechanisms underlying loss of cavernosal endothelial function promoted by VRFs and to discuss local and systemic methods for endothelial function assessment in ED individuals, focusing on the PNORT. MAIN OUTCOME MEASURES A complete revision on the novel basic and clinical links between endothelial and ED. METHODS A systematic review of the literature regarding the aforementioned issues. RESULTS Risk factor-associated cavernosal endothelial dysfunction is mostly induced by unifying mechanisms, including oxidative stress and impaired endothelial nitric oxide functional activities, which present clinically as ED. Several techniques to evaluate endothelial dysfunction were revised, with advantages and limitations debated, focusing on our detailed expertise using the PNORT method. CONCLUSIONS The established endothelial-erectile dysfunction connection was thoroughly revised, from basic mechanisms to the clinical importance of endothelial dysfunction assessment as diagnosis for generalized vascular disease. Further studies are required to disclose efficient approaches to repair disabled endothelium and both restore and prevent endothelial dysfunction.
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Affiliation(s)
- Carla Costa
- Faculty of Medicine of the University of Porto, Department of Biochemistry (U38-FCT), Porto, Portugal.
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Increased expression of the nitric oxide synthase gene and protein in corpus cavernosum by repeated dosing of udenafil in a rat model of chemical diabetogenesis. Asian J Androl 2009; 11:435-42. [PMID: 19465935 DOI: 10.1038/aja.2009.27] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Erectile dysfunction (ED) is a major complication of diabetes mellitus (DM). This study investigates the relationship between ED and the downregulation of constitutive nitric oxide synthase (cNOS) in the corpus cavernosum (CC) of diabetic rats. It also examines the effects of udenafil, a phosphodiesterase type 5 (PDE5) inhibitor, on ED and cNOS expression levels. After 16 weeks of daily oral treatment with udenafil in diabetic rats, the intracavernous pressure/mean arterial pressure (ICP/MAP) ratio was recorded to measure erectile function, and cNOS expression was measured using reverse transcriptase (RT)-PCR and immunoblots. Although the ICP/MAP ratio and the expression levels of endothelial NOS (eNOS) and neuronal NOS (nNOS) in the CC were markedly decreased in diabetic rats, long-term udenafil treatment improved the erectile function and increased cNOS expression compared with diabetic controls. These findings suggest that ED in DM is closely related to decreased cNOS expression in the CC and that udenafil has the ability to compensate for this pathological change by modulating cNOS expression. Udenafil also has an inhibitory role in cGMP (cyclic guanosine monophosphate) degradation.
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Hidalgo-Tamola J, Chitaley K. Review type 2 diabetes mellitus and erectile dysfunction. J Sex Med 2008; 6:916-926. [PMID: 19067787 DOI: 10.1111/j.1743-6109.2008.01116.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
INTRODUCTION Diabetes mellitus (DM) is a major risk factor for the development of erectile dysfunction (ED). Although most diabetic ED cases are in patients with type 2 diabetes (T2DM), the majority of basic science studies examining mechanisms of diabetic ED have been conducted in animal models of type 1 diabetes. AIM Recently, however, clinical and laboratory-based studies have uncovered some key underlying factors of T2DM-associated ED, which we have compiled in this review of T2DM ED. MAIN OUTCOME MEASURES The outcomes discussed in this review include major mechanisms underlying T2DM, discussing both clinical and basic science studies. METHODS We conducted an extensive search of pertinent clinical and basic science literature using PUBMED. RESULTS Mechanisms causing ED in T2DM are multifactorial and often lead to resistance to current therapy. Systemic effects of hyperglycemia and hypogonadism contribute to the development of impaired vasodilatory signaling, smooth muscle cell hypercontractility, and veno-occlusive disorder in T2DM ED. CONCLUSIONS Understanding the different causes for ED in T2DM patients may allow targeted therapy for improved erectile function.
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Affiliation(s)
| | - Kanchan Chitaley
- University of Washington-Department of Urology, Seattle, Washington, WA, USA.
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Zhang LW, Piao S, Choi MJ, Shin H, Jin H, Kim WJ, Song SU, Han J, Park SH, Mamura M, Kim S, Ryu J, Suh J. Role of Increased Penile Expression of Transforming Growth Factor‐β1 and Activation of the Smad Signaling Pathway in Erectile Dysfunction in Streptozotocin‐Induced Diabetic Rats. J Sex Med 2008; 5:2318-29. [DOI: 10.1111/j.1743-6109.2008.00977.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Xie D, Hazarika S, Andrich AJ, Padgett ME, Kontos CD, Donatucci CF, Annex BH. High cholesterol feeding in C57/Blc6 mice alters expression within the VEGF receptor-ligand family in corporal tissue. J Sex Med 2008; 5:1137-1148. [PMID: 18439153 DOI: 10.1111/j.1743-6109.2008.00801.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Angiogenesis, the growth and proliferation of blood vessels from existing vascular structures, is mediated by many cytokine growth factors and receptors, among the most important are the vascular endothelial growth factor (VEGF) family. AIM Decreases in VEGF receptor signaling have been linked to abnormalities in vasoreactivity in corporal tissue, but it is unknown if alterations in the VEGF ligands and/or receptors contribute to this process. MAIN OUTCOME MEASURES We sought to determine changes in vasoreactivity and the expression of the family of VEGF ligands and receptors in corporal tissue with cholesterol feeding in C57BL6 mice. Methods. Twenty-four mice (N = 8/group) were fed a normal diet (Group 1) or a 1.25% high cholesterol diet for 4 (Group 2) or 12 (Group 3) weeks. Isometric tension studies were performed on corporal strips and dose response curves were generated to evaluate endothelium-dependent and endothelium-independent vasoreactivities. Levels of VEGF-A, B, C, D, VEGF receptors (VEGFRs) were detected by PCR (polymerase chain reaction) and/or western blot/enzyme-linked immunosorbent assay (ELISA). Endothelial and smooth muscle cell contents were determined by immunohistochemistry. RESULTS At 4 weeks there was a small but significant decrease in endothelium-dependent vasoreactivity. Both mRNA and protein levels of VEGFR-1 were decreased, while VEGF-B was increased in Group 2 vs. Group 1, with no change in VEGF-A or endothelial cell content. By 12 weeks, decreases in both endothelium-dependent and endothelium-independent vasoreactivity were evident with decrease in most VEGF ligands (except VEGF-B), receptors, and receptor signaling. CONCLUSIONS Cholesterol feeding in C57BL6 mice results in alterations in the VEGF receptor-ligand family that may initially serve to limit the degree of vascular injury but these adaptations fail with the continuation of cholesterol feeding.
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Affiliation(s)
- Donghua Xie
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC
| | - Surovi Hazarika
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC
| | - Amy J Andrich
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC
| | - Mike E Padgett
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC
| | - Christopher D Kontos
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC
| | | | - Brian H Annex
- Division of Cardiovascular Medicine and the Department of Medicine, Duke University Medical Center, Durham, NC;.
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47
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Kaminetsky J. Epidemiology and pathophysiology of male sexual dysfunction. Int J Impot Res 2008; 20 Suppl 1:S3-10. [DOI: 10.1038/ijir.2008.16] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Trussell JC, Legro RS. Erectile dysfunction: does insulin resistance play a part? Fertil Steril 2007; 88:771-8. [PMID: 17498710 DOI: 10.1016/j.fertnstert.2007.01.116] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2006] [Revised: 01/17/2007] [Accepted: 01/17/2007] [Indexed: 01/23/2023]
Abstract
OBJECTIVE To review MEDLINE literature for correlations between insulin resistance and erectile dysfunction (ED). DESIGN MEDLINE literature review (1966 to present). SETTING Academic medical center. PATIENT(S) None. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) None. RESULT(S) Erectile dysfunction affects more than half of men over the age of 40. Fortunately, most men with ED can be successfully treated with phosphodiesterase 5A (PDE-5) inhibitors, which up-regulate the vasodilatory effects of nitric oxide (NO). Insulin resistance affects 25% of U.S. adults and increases to a 60% occurrence in individuals who are overweight. Endothelial dysfunction, which is associated with insulin resistance states, can cause disturbances in the subcellular signaling pathways required for NO production. Because endothelial production of NO and insulin sensitivity are positively related in healthy humans, the relationships among insulin resistance, NO, and ED are the target of this review of MEDLINE literature. CONCLUSION(S) Insulin resistance states are characterized by defective vascular NO production and impaired insulin-induced vasodilation, both of which are likely to cause ED. Diagnosing and treating insulin resistance should be part of the initial management plan for ED. Future studies concerning the cause and effect relationship of insulin resistance and ED should be implemented.
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Affiliation(s)
- J C Trussell
- Division of Urology, Penn State Milton S. Hershey Medical Center and Penn State College of Medicine, Hershey, PA 17033-0850, USA.
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Xie D, Odronic SI, Wu F, Pippen A, Donatucci CF, Annex BH. Mouse model of erectile dysfunction due to diet-induced diabetes mellitus. Urology 2007; 70:196-201. [PMID: 17656247 PMCID: PMC2245873 DOI: 10.1016/j.urology.2007.02.060] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2006] [Revised: 01/05/2007] [Accepted: 02/27/2007] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To determine whether diet-induced diabetes mellitus (DM) in mice would reproduce the major features of human erectile dysfunction (ED) because DM is a significant risk factor in the development of ED. METHODS In total, 150 C57BL6 (bl6) mice were divided into six groups of 25 mice each. Of these 150 mice, 125 were fed a high-fat (45% of total calories) diet for the final 4 (group 2), 8 (group 3), 12 (group 4), 16 (group 5), or 22 (group 6) weeks. Group 1 was fed a normal diet. The mice were 22 to 25 weeks old at study termination. The corporal tissues were harvested and studied for endothelium-dependent and endothelium-independent vasoreactivity, endothelial and smooth muscle cell content by immunohistochemistry, nitric oxide synthase expression by nicotinamide adenine dinucleotide-diaphorase staining, and apoptosis by terminal deoxynucleotidyl transferase biotin-D-UTP nick-end labeling staining. RESULTS The blood glucose levels were greater in groups 2 to 6 compared with those in group 1. The vasoreactivity, endothelial cell content, and smooth muscle/collagen ratio were lower and apoptosis were greater in the DM mice (P = 0.0001, P = 0.10, P = 0.0002, P <0.001, and P <0.001, respectively). Significantly decreased nitric oxide synthase expression and significantly increased apoptosis (P <0.0001 each) was found in the high-fat diet mice. CONCLUSIONS Corporal tissue from mice with diet-induced DM demonstrated many of the major functional, structural, and biochemical changes found in humans with ED. This model should serve as a valuable tool for advancing our understanding of the role DM plays in the pathogenesis of ED.
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Affiliation(s)
- Donghua Xie
- Division of Cardiology, Department of Medicine, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
| | - Shelley I. Odronic
- Division of Cardiology, Department of Medicine, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
| | - Feihua Wu
- Division of Cardiology, Department of Medicine, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
| | - Anne Pippen
- Division of Cardiology, Department of Medicine, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
| | - Craig F. Donatucci
- Division of Urology, Department of Surgery, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
| | - Brian H. Annex
- Division of Cardiology, Department of Medicine, Durham VA and Duke University Medical Center, Duke University Medical Center, Durham, North Carolina 27710
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Kim YH, Choi MY, Kim YS, Han JM, Lee JH, Park CH, Kang SS, Choi WS, Cho GJ. Protein kinase C delta regulates anti-apoptotic alphaB-crystallin in the retina of type 2 diabetes. Neurobiol Dis 2007; 28:293-303. [PMID: 17904375 DOI: 10.1016/j.nbd.2007.07.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2007] [Revised: 07/06/2007] [Accepted: 07/17/2007] [Indexed: 12/22/2022] Open
Abstract
We investigated the relationship between phosphorylation of alphaB-crystallin (alphaBC) and retinal apoptosis in type 2 diabetes. The retinas of male Otsuka Long-Evans Tokushima fatty (OLETF) rats at 24 and 35 weeks were used as an animal model for type 2 diabetes and sex- and age-matched Long-Evans Tokushima Otsuka (LETO) rats were used as controls. In the retinas of 35-week OLETF rats, the interaction between alphaBC and protein kinase C delta (PKC delta) among the PKC isozymes, alphaBC phosphorylation at Ser45 (S45p-alphaBC), TUNEL-positive apoptotic ganglion cells, several apoptotic signs, and co-localization of S45p-alphaBC and TUNEL significantly increased as compared with other groups while the alphaBC-Bax interaction greatly decreased. These changes were abolished by rottlerin treatment, a highly specific PKC delta inhibitor. These results suggest that PKC delta is involved in regulation of anti-apoptotic function of alphaBC in the retina of type 2 diabetes.
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Affiliation(s)
- Y H Kim
- Department of Anatomy and Neurobiology, School of Medicine, Institute of Health Science, Gyeongsang National University, Jinju, Chilam-dong 92, Jinju, Gyeongnam 660-751, South Korea
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