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Soni KK, Jeong HS, Jang S. Neurons for Ejaculation and Factors Affecting Ejaculation. BIOLOGY 2022; 11:biology11050686. [PMID: 35625414 PMCID: PMC9138817 DOI: 10.3390/biology11050686] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 04/27/2022] [Accepted: 04/28/2022] [Indexed: 12/31/2022]
Abstract
Simple Summary Sexual dysfunctions are rarely discussed in our current society. Males experience different sexual dysfunctions, including erectile, infertility, and ejaculatory dysfunctions. In this review only the ejaculatory dysfunction will be discussed. Ejaculation is defined as the ejection of contents collectively from the vas deferens, seminal vesicle, prostate and Cowper’s glands. It is completely controlled by a population of neurons present in the lumbar spinal cord. The presence of lesion in these neurons ceases the ejaculatory behavior in males. This population of neurons was first identified in rats; however, recently it was confirmed that these neurons are present in human males as well. The issues are known as ejaculatory dysfunction. The following are the different types of ejaculatory dysfunctions: early ejaculation, ejaculation into the urinary bladder, late ejaculation and no ejaculation. Abstract Ejaculation is a reflex and the last stage of intercourse in male mammals. It consists of two coordinated phases, emission and expulsion. The emission phase consists of secretions from the vas deferens, seminal vesicle, prostate, and Cowper’s gland. Once these contents reach the posterior urethra, movement of the contents becomes inevitable, followed by the expulsion phase. The urogenital organs are synchronized during this complete event. The L3–L4 (lumbar) segment, the spinal cord region responsible for ejaculation, nerve cell bodies, also called lumbar spinothalamic (LSt) cells, which are denoted as spinal ejaculation generators or lumbar spinothalamic cells [Lst]. Lst cells activation causes ejaculation. These Lst cells coordinate with [autonomic] parasympathetic and sympathetic assistance in ejaculation. The presence of a spinal ejaculatory generator has recently been confirmed in humans. Different types of ejaculatory dysfunction in humans include premature ejaculation (PE), retrograde ejaculation (RE), delayed ejaculation (DE), and anejaculation (AE). The most common form of ejaculatory dysfunction studied is premature ejaculation. The least common forms of ejaculation studied are delayed ejaculation and anejaculation. Despite the confirmation of Lst in humans, there is insufficient research on animals mimicking human ejaculatory dysfunction.
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Mostafa T, Abdel-Hamid IA. Ejaculatory dysfunction in men with diabetes mellitus. World J Diabetes 2021; 12:954-974. [PMID: 34326948 PMCID: PMC8311479 DOI: 10.4239/wjd.v12.i7.954] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 05/06/2021] [Accepted: 06/15/2021] [Indexed: 02/06/2023] Open
Abstract
Diabetes mellitus (DM) is a metabolic disorder that is characterized by elevated blood glucose levels due to absolute or relative insulin deficiency, in the background of β-cell dysfunction, insulin resistance, or both. Such chronic hyperglycemia is linked to long-term damage to blood vessels, nerves, and various organs. Currently, the worldwide burden of DM and its complications is in increase. Male sexual dysfunction is one of the famous complications of DM, including abnormal orgasmic/ejaculatory functions, desire/libido, and erection. Ejaculatory dysfunction encompasses several disorders related to DM and its complications, such as premature ejaculation, anejaculation (AE), delayed ejaculation, retrograde ejaculation (RE), ejaculatory pain, anesthetic ejaculation, decreased ejaculate volume, and decreased force of ejaculation. The problems linked to ejaculatory dysfunction may extend beyond the poor quality of life in diabetics as both AE and RE are alleged to alter the fertility potential of these patients. However, although both diabetes patients and their physicians are increasingly aware of diabetic ejaculatory dysfunction, this awareness still lags behind that of other diabetes complications. Therefore, all these disorders should be looked for thoroughly during the clinical evaluation of diabetic men. Besides, introducing the suitable option and/or maneuvers to treat these disorders should be tailored according to each case. This review aimed to explore the most important findings regarding ejaculatory dysfunction in diabetes from pre-clinical and clinical perspectives.
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Affiliation(s)
- Taymour Mostafa
- Department of Andrology & Sexology, Faculty of Medicine, Cairo University, Cairo 11562, Egypt
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Aoun F, Mjaess G, Lilly E, Khalil N, Tayeh GA, Sarkis J, Mansour R, Alkassis M, Chebel R, Absil F, Bollens R. Is pudendal nerve entrapment a potential cause for weak ejaculation? Int J Impot Res 2021; 34:520-523. [PMID: 33972715 DOI: 10.1038/s41443-021-00443-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/12/2021] [Accepted: 04/20/2021] [Indexed: 11/09/2022]
Abstract
Ejaculatory dysfunction is one of the most common complaints of patients with sexual disorders. While it encompasses several ejaculatory disorders, weak ejaculation is seldom described in the literature. Since the pudendal nerve is the main nerve of ejaculation, we aim to hypothesize that pudendal nerve entrapment could be a cause of weak ejaculation, and that pudendal nerve release could contribute to the improvement of the ejaculatory stream. We presented two cases suffering from a weak ejaculatory stream and sensation of incomplete semen emptying, accompanied with clinical features of pudendal nerve entrapment. Both cases improved after pudendal nerve block and then laparoscopic transperitoneal pudendal release, with a sustained amelioration of the ejaculatory stream after 3 weeks of surgery. Pudendal canal entrapment is therefore a potentially curable cause for weak ejaculation.
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Affiliation(s)
- Fouad Aoun
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon. .,Department of Urology, Institut Jules Bordet, Brussels, Belgium.
| | - Georges Mjaess
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Eddy Lilly
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Nour Khalil
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | | | - Julien Sarkis
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Raymond Mansour
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Marwan Alkassis
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Roy Chebel
- Department of Urology, Hotel-Dieu de France, Beirut, Lebanon
| | - Fabienne Absil
- Department of Gynecology, EpiCura Hospital, Ath, Belgium
| | - Renaud Bollens
- Department of Urology, Wallonie Picarde Hospital, Tournai, Belgium
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Hur MS, Lee HW, Yang HM, Kwon HJ, O J, Lee S, Oh CS. Longitudinal muscular column in the prostatic urethral wall: Its form, shape, and possible function based on mathematical simulation in ejaculation. Prostate 2020; 80:471-480. [PMID: 32049374 DOI: 10.1002/pros.23961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 02/04/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND The shape and function of the longitudinal muscular column (LMC) of the prostate have not been established in detail. The present study was undertaken to elucidate the roles of the LMC of the posterior wall of the prostatic urethra (PSU) in the emission phase of ejaculation by investigating the form and muscular arrangement of the LMC. METHODS Prostates and urinary bladders were obtained from 14 Korean adult cadavers. Nine specimens were histologically analyzed using hematoxylin and eosin, Masson's trichrome, and Verhoeff-van Gieson staining. Two specimens were scanned using microcomputed tomography (micro-CT), and all scanned images were reconstructed into a three-dimensional model. RESULTS At the proximal level of the prostate, the ejaculatory ducts (EDs) and prostatic utricle (PU) together were surrounded by circular smooth-muscle fibers. However, at the seminal colliculus (SC) where the EDs and PU opened, they were mainly surrounded by an abundance of longitudinal fibers. The longitudinal fibers posterior to the EDs and PU formed a distinctive LMC in the posterior urethral wall. In histologic sections and micro-CT images, the LMC extended distally from the level of the SC to the level of the membranous urethra (MBU). We simulated a potential mechanism of LMC using a mathematical model of its movements. CONCLUSIONS Comprehensive analyses based on in-depth assessment of histologic characteristics and micro-CT images demonstrated extension of the LMC from the level of the SC to the level of the MBU, enabling a better understanding of ejaculation physiology involving the LMC. These results suggest that the LMC in the posterior wall of the PSU is a critical component of ejaculation by facilitating the ejection of seminal vesicle fluid into the PSU via well-coordinated contractions.
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Affiliation(s)
- Mi-Sun Hur
- Department of Anatomy, Catholic Kwandong University College of Medicine, Gangneung, Korea
| | - Hye Won Lee
- Department of Hospital Medicine, College of Medicine, Yonsei University, Seoul, Korea
| | - Hun-Mu Yang
- Department of Anatomy, Yonsei University College of Medicine, Seoul, Korea
| | - Hyun-Jin Kwon
- Department of Anatomy, Yonsei University College of Medicine, Seoul, Korea
| | - Jehoon O
- Department of Anatomy, Yonsei University College of Medicine, Seoul, Korea
| | - Seunggyu Lee
- Department of Mathematics and Research Institute of Natural Science, Gyeongsang National University, Jinju, Korea
| | - Chang-Seok Oh
- Department of Anatomy and Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Korea
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Avellino GJ, Lipshultz LI, Sigman M, Hwang K. Transurethral resection of the ejaculatory ducts: etiology of obstruction and surgical treatment options. Fertil Steril 2019; 111:427-443. [DOI: 10.1016/j.fertnstert.2019.01.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 01/02/2019] [Indexed: 01/19/2023]
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Medrano JV, Luján S, Andrés MDM, Pellicer A. [Current state regarding fertility cryopreservation in pre-pubertal boys]. Rev Int Androl 2018; 18:27-34. [PMID: 30477959 DOI: 10.1016/j.androl.2018.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 05/08/2018] [Accepted: 07/25/2018] [Indexed: 01/15/2023]
Abstract
Some treatments for any cancer therapy and hematological diseases may have gonadotoxic side effects that can result in infertility, and thus sperm cryopreservation is routinely offered to patients as the strategy to preserve their fertility. However, there are many cases where sperm banking cannot be applied, as is the case of pre-pubertal cancer patients and others unable to produce mature gametes at the moment of diagnosis. Regarding this, recent breakthroughs have gained public attention to the fertility preservation options that Regenerative Medicine can offer to these patients. In this review, we tried to compile and discuss the latest updates about all these strategies from a critical point of view.
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Affiliation(s)
- Jose V Medrano
- Unidad de Medicina Reproductiva, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, España.
| | - Saturnino Luján
- Unidad de Medicina Reproductiva, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, España
| | - María Del Mar Andrés
- Unidad de Oncología pediátrica, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Antonio Pellicer
- Unidad de Medicina Reproductiva, Instituto de Investigación Sanitaria La Fe (IIS La Fe), Valencia, España
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Perineal Ultrasound: a Review in the Context of Ejaculatory Dysfunction. Sex Med Rev 2018; 6:419-428. [DOI: 10.1016/j.sxmr.2017.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 12/11/2017] [Accepted: 12/15/2017] [Indexed: 01/23/2023]
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Burnstock G. Purinergic Signalling: Therapeutic Developments. Front Pharmacol 2017; 8:661. [PMID: 28993732 PMCID: PMC5622197 DOI: 10.3389/fphar.2017.00661] [Citation(s) in RCA: 275] [Impact Index Per Article: 39.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 09/05/2017] [Indexed: 12/15/2022] Open
Abstract
Purinergic signalling, i.e., the role of nucleotides as extracellular signalling molecules, was proposed in 1972. However, this concept was not well accepted until the early 1990's when receptor subtypes for purines and pyrimidines were cloned and characterised, which includes four subtypes of the P1 (adenosine) receptor, seven subtypes of P2X ion channel receptors and 8 subtypes of the P2Y G protein-coupled receptor. Early studies were largely concerned with the physiology, pharmacology and biochemistry of purinergic signalling. More recently, the focus has been on the pathophysiology and therapeutic potential. There was early recognition of the use of P1 receptor agonists for the treatment of supraventricular tachycardia and A2A receptor antagonists are promising for the treatment of Parkinson's disease. Clopidogrel, a P2Y12 antagonist, is widely used for the treatment of thrombosis and stroke, blocking P2Y12 receptor-mediated platelet aggregation. Diquafosol, a long acting P2Y2 receptor agonist, is being used for the treatment of dry eye. P2X3 receptor antagonists have been developed that are orally bioavailable and stable in vivo and are currently in clinical trials for the treatment of chronic cough, bladder incontinence, visceral pain and hypertension. Antagonists to P2X7 receptors are being investigated for the treatment of inflammatory disorders, including neurodegenerative diseases. Other investigations are in progress for the use of purinergic agents for the treatment of osteoporosis, myocardial infarction, irritable bowel syndrome, epilepsy, atherosclerosis, depression, autism, diabetes, and cancer.
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Affiliation(s)
- Geoffrey Burnstock
- Autonomic Neuroscience Centre, University College Medical SchoolLondon, United Kingdom
- Department of Pharmacology and Therapeutics, The University of Melbourne, MelbourneVIC, Australia
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Morgentaler A, Polzer P, Althof S, Bolyakov A, Donatucci C, Ni X, Patel AB, Basaria S. Delayed Ejaculation and Associated Complaints: Relationship to Ejaculation Times and Serum Testosterone Levels. J Sex Med 2017; 14:1116-1124. [PMID: 28807505 DOI: 10.1016/j.jsxm.2017.06.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 06/24/2017] [Accepted: 06/28/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Although delayed ejaculation (DE) is typically characterized as a persistently longer than anticipated or desired time to ejaculation (or orgasm) during sexual activity, a timing-based definition of DE and its association with serum testosterone has not been established in a large cohort. AIM To examine in an observational study estimated intravaginal ejaculatory latency time (IELT) and masturbatory ejaculation latency time (MELT) in men self-reporting DE, assess the association of IELT and MELT with serum testosterone levels, and determine whether correlation with demographic and sexual parameters exist. METHODS Men who resided in the United States, Canada, and Mexico were enrolled from 2011 to 2013. Self-estimated IELT and MELT were captured using an Ejaculatory Function Screening Questionnaire in a sample of 988 men screened for possible inclusion in a randomized clinical trial assessing testosterone replacement therapy for ejaculatory dysfunction (EjD) and who self-reported the presence or absence of DE and symptoms of hypogonadism. Additional comorbid EjDs (ie, anejaculation, perceived decrease in ejaculate volume, and decreased force of ejaculation) were recorded. Men with premature ejaculation were excluded from this analysis. IELT and MELT were compared between men self-reporting DE and men without DE. The associations of IELT and MELT with serum testosterone were measured. OUTCOMES IELT, MELT, and total testosterone levels. RESULTS Sixty-two percent of screened men self-reported DE with or without comorbid EjDs; 38% did not report DE but did report at least one of the other EjDs. Estimated median IELTs were 20.0 minutes for DE vs 15 minutes for no DE (P < .001). Estimated median MELTs were 15.0 minutes for DE vs 8.0 minutes for no DE (P < .001). Ejaculation time was not associated with serum testosterone levels. Younger men and those with less severe erectile dysfunction had longer IELTs and MELTs. CLINICAL IMPLICATIONS Estimated ejaculation times during vaginal intercourse and/or masturbation were not associated with serum testosterone levels in this study; thus, routine androgen evaluation is not indicated in these men. STRENGTHS AND LIMITATIONS This large systematic analysis attempted to objectively assess the ejaculation latency in men with self-reported DE. Limitations were that ejaculation time estimates were self-reported and were queried only once; the questionnaire did not distinguish between failure to achieve orgasm and ejaculation; and assessment of DE was limited to heterosexual vaginal intercourse and masturbation. CONCLUSION IELT and MELT were longer in men with DE, and there was no association of ejaculation times with serum testosterone levels in this study population. Morgentaler A, Polzer P, Althof S, et al. Delayed Ejaculation and Associated Complaints: Relationship to Ejaculation Times and Serum Testosterone Levels. J Sex Med 2017;14:1116-1124.
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Affiliation(s)
| | | | - Stanley Althof
- Center for Marital and Sexual Health of South Florida, West Palm Beach, FL, USA
| | | | | | - Xiao Ni
- Eli Lilly and Company, Indianapolis, IN, USA
| | | | - Shehzad Basaria
- Section on Men's Health, Aging and Metabolism, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
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Font MD, Pastuszak AW, Case JR, Lipshultz LI. An infertile male with dilated seminal vesicles due to functional obstruction. Asian J Androl 2017; 19:256-257. [PMID: 27320475 PMCID: PMC5312229 DOI: 10.4103/1008-682x.179858] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
| | - Alexander W Pastuszak
- Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.,Scott Department of Urology, Baylor College of Medicine, Houston, TX, 77030, USA
| | - John R Case
- Urology San Antonio, San Antonio, TX, 78229, USA
| | - Larry I Lipshultz
- Center for Reproductive Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.,Scott Department of Urology, Baylor College of Medicine, Houston, TX, 77030, USA
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Avellino G, Theva D, Oates RD. Common urologic diseases in older men and their treatment: how they impact fertility. Fertil Steril 2017; 107:305-311. [DOI: 10.1016/j.fertnstert.2016.12.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 12/12/2016] [Accepted: 12/12/2016] [Indexed: 12/11/2022]
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Abstract
Delayed ejaculation (DE) is probably least studied, and least understood of male sexual dysfunctions, with an estimated prevalence of 1–4% of the male population. Pathophysiology of DE is multifactorial and including psychosexual-behavioral and cultural factors, disruption of ejaculatory apparatus, central and peripheral neurotransmitters, hormonal or neurochemical ejaculatory control and psychosocial factors. Although knowledge of the physiology of the DE has increased in the last two decade, our understanding of the different pathophysiological process of the causes of DE remains limited. To provide a systematic update on the pathophysiology of DE. A systematic review of Medline and PubMed for relevant publications on ejaculatory dysfunction (EjD), DE, retarded ejaculation, inhibited ejaculation, and climax was performed. The search was limited to the articles published between the January 1960 and December 2015 in English. Of 178 articles, 105 were selected for this review. Only those publications relevant to the pathophysiology, epidemiology and prevalence of DE were included. The pathophysiology of DE involves cerebral sensory areas, motor centers, and several spinal nuclei that are tightly interconnected. The biogenic, psychogenic and other factors strongly affect the pathophysiology of DE. Despite the many publications on this disorder, there still is a paucity of publications dedicated to the subject.
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Affiliation(s)
- Juza Chen
- Department of Urology, Tel-Aviv Sourasky Medical Center, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6423906, Israel
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Basson R, Bronner G. Management and rehabilitation of neurologic patients with sexual dysfunction. HANDBOOK OF CLINICAL NEUROLOGY 2015; 130:415-34. [DOI: 10.1016/b978-0-444-63247-0.00024-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Santos SAA, Rinaldi JC, Martins AE, Camargo ACL, Leonelli C, Delella FK, Felisbino SL, Justulin LA. Impact of gestational diabetes and lactational insulin replacement on structure and secretory function of offspring rat ventral prostate. Gen Comp Endocrinol 2014; 206:60-71. [PMID: 24983773 DOI: 10.1016/j.ygcen.2014.06.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 06/16/2014] [Accepted: 06/21/2014] [Indexed: 01/06/2023]
Abstract
Clinical and experimental studies have shown that exposure to adverse conditions during the critical stages of embryonic, fetal or neonatal development lead to a significantly increased risk of later disease. Diabetes during pregnancy has been linked to increased risk of obesity and diabetes in offspring. Here, we investigated whether mild gestational diabetes mellitus (GDM) followed or not by maternal insulin replacement affects the ventral prostate (VP) structure and function in male offspring at puberty and adulthood. Pregnant rats were divided into the following 3 groups: control (CT); streptozotocin (STZ)-induced diabetes (D); and D plus insulin replacement during lactation (GDI). The male offspring from different groups were euthanized at postnatal day (PND) 60 and 120. Biometrical parameters, hormonal levels and prostates were evaluated. Mild-GDM promoted reduction in the glandular parenchyma and increased collagen deposition. Insulin replacement during lactation restored the VP morphology. Most importantly, mild-GDM decreased the androgen-induced secretory function as determined by prostatein expression, and insulin replacement reversed this effect. Our results demonstrated that mild GDM impairs VP parenchyma maturation, which is associated with an increase in the fibromuscular stroma compartment. Functionally, the reduction in the VP parenchyma decreases the glandular secretory activity as demonstrated by low expression of prostatein, a potent immunosuppressor factor that protects sperm from immunologic damage into the feminine reproductive tract. This change could lead to impairment of reproductive function in male offspring from diabetic mothers. Maternal insulin replacement during the weaning period apparently restores the prostate function in male offspring.
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Affiliation(s)
- Sérgio A A Santos
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Jaqueline C Rinaldi
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Amanda E Martins
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Ana C L Camargo
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Carina Leonelli
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Flávia K Delella
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Sérgio L Felisbino
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil
| | - Luis A Justulin
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista, Botucatu, SP, Brazil.
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