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Testosterone and aging

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https://www.readbyqxmd.com/read/29912343/impact-on-testicular-function-of-a-single-ablative-activity-of-3-7-gbq-radioactive-iodine-for-differentiated-thyroid-carcinoma
#1
N Bourcigaux, C Rubino, I Berthaud, M E Toubert, B Donadille, L Leenhardt, I Petrot-Keller, S Brailly-Tabard, J Fromigué, F de Vathaire, T Simon, J P Siffroi, M Schlumberger, P Bouchard, S Christin-Maitre
STUDY QUESTION: What are the consequences of radioactive iodine (RAI) therapy for testicular function? SUMMARY ANSWER: A single activity of 3.7 GBq RAI for differentiated thyroid carcinoma (DTC) treatment in young men transiently altered Sertoli cell function and induced sperm chromosomal abnormalities. WHAT IS KNOWN ALREADY: Few studies, mainly retrospective, have reported the potential impacts of RAI on endocrine and exocrine testicular function...
June 15, 2018: Human Reproduction
https://www.readbyqxmd.com/read/29910248/association-of-total-testosterone-free-testosterone-bioavailable-testosterone-and-sex-hormone-binding-globulin-with-hepatic-steatosis-and-the-ratio-of-aspartate-aminotransferase-to-alanine-aminotransferase
#2
Qingtao Yang, Kusheng Wu, Yiyi Zhuang, Haoqiang Wu, Liang Lu, Wencai Li, Zhenjie Li, Xuxia Sui
Several articles have shown the inverse association between total testosterone (TT) or sex hormone-binding globulin (SHBG) and hepatic steatosis. No articles report associations of TT, SHBG, free testosterone (FT), and bioavailable testosterone (BioT) with aspartate aminotransferase (AST)/alanine aminotransferase (ALT) ratios. Therefore, we investigated the associations of TT, FT, BioT and SHBG with hepatic steatosis and AST/ALT ratios. A total of 218 men were enrolled. We diagnosed hepatic steatosis by ultrasound...
June 16, 2018: Endocrine Journal
https://www.readbyqxmd.com/read/29909545/coalitional-physical-competition-acute-salivary-steroid-hormone-responses-among-juvenile-male-soccer-players-in-hong-kong
#3
Timothy S McHale, Wai-Chi Chee, Ka-Chun Chan, David T Zava, Peter B Gray
A large body of research links testosterone and cortisol to male-male competition. Yet, little work has explored acute steroid hormone responses to coalitional, physical competition during middle childhood. Here, we investigate testosterone, dehydroepiandrosterone (DHEA), androstenedione, and cortisol release among ethnically Chinese boys in Hong Kong (N = 102), aged 8-11 years, during a soccer match (n = 84) and an intrasquad soccer scrimmage (n = 81), with 63 participants competing in both treatments. The soccer match and intrasquad soccer scrimmage represented out-group and in-group treatments, respectively...
June 16, 2018: Human Nature: An Interdisciplinary Biosocial Perspective
https://www.readbyqxmd.com/read/29907777/social-status-and-prenatal-testosterone-exposure-assessed-via-second-to-fourth-digit-ratio-affect-6-9-year-old-children-s-prosocial-choices
#4
Lisa Horn, Niklas A Hungerländer, Sonja Windhager, Thomas Bugnyar, Jorg J M Massen
Prosocial behaviour (i.e., voluntary behaviour intended to benefit another) seems to be fully developed in children by the age of 6 years. However, questions about which factors modify prosocial behaviour at that age remain understudied. Here we used a resource allocation paradigm to test prosocial behaviour in 6-9-year-old school children. They could decide between a "selfish" (i.e., one sticker for themselves) and a "prosocial" option (i.e., one sticker for themselves and one for the receiver) and we tested whether friendship, social status and prenatal androgen exposure (approximated by the 2nd to 4th digit ratio; 2D:4D) influenced children's prosocial choices...
June 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29904126/effect-of-testosterone-treatment-on-bone-remodelling-markers-and-mineral-density-in-obese-dieting-men-in-a-randomized-clinical-trial
#5
Mark Ng Tang Fui, Rudolf Hoermann, Brendan Nolan, Michelle Clarke, Jeffrey D Zajac, Mathis Grossmann
To assess the effect of testosterone treatment on bone remodelling and density in dieting obese men, 100 obese men aged 53 years (interquartile range 47-60) with a total testosterone level <12 nmol/L receiving 10 weeks of a very low energy diet (VLED) followed by 46 weeks of weight maintenance were randomly assigned at baseline to 56 weeks of intramuscular testosterone undecanoate (n = 49, cases) or matching placebo (n = 51, controls). Pre-specified outcomes were between-group differences (mean adjusted difference, MAD) in serum c-telopeptide (CTx), N-terminal propeptide of type 1 procollagen (P1NP) and bone mineral density (BMD)...
June 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29903608/management-of-pediatric-patients-with-dsd-and-ambiguous-genitalia-balancing-the-child-s-moral-claims-to-self-determination-with-parental-values-and-preferences
#6
David A Diamond, Jonathan Swartz, Amy Tishelman, Judith Johnson, Yee-Ming Chan
INTRODUCTION: A central ethical dilemma in management of the patient with a disorder of sex development (DSD) is the potential conflict between respect for the fundamental right of the child for physical and emotional integrity and self-determination, and the right of parents to serve as surrogate decision-makers and act in their child's best interest. METHODS: Over the past 2 years we have encountered three complex DSD cases on the spectrum of mixed gonadal dysgenesis to ovotesticular DSD in which gender assignment and therefore optimal surgical management was uncertain...
June 1, 2018: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/29900582/reactions-of-female-cheetahs-acinonyx-jubatus-to-urine-volatiles-from-males-of-varying-genetic-distance
#7
Regina H Mossotti, Eli A Baskir, Corinne P Kozlowski, Ashley D Franklin, George A Feldhamer, Cheryl S Asa
Understanding the factors used by female cheetahs (Acinonyx jubatus) to make mate choice decisions could benefit zoo breeding programs, which currently assign mates based primarily on genetic distance. Because transporting animals between institutions is costly and can be stressful, females are often limited in the number of males available for mating. One solution would be to determine if an easily transported substance could be used to gauge interest by a female to a potential mate. Here, we investigate female interest in urine samples from males of different genetic distances...
June 13, 2018: Zoo Biology
https://www.readbyqxmd.com/read/29898815/effects-of-gestational-exposure-to-di-n-butyl-phthalate-and-mineral-oil-on-testis-development-of-the-mongolian-gerbil
#8
C M Christante, M E Pinto-Fochi, A C Negrin, S R Taboga, R M Góes
Phthalate esters are endocrine disrupters that can affect the development of the testis in a species-specific manner. However, their interference in the male gonads of the Mongolian gerbil is unknown. The aim of the present study was to evaluate whether gestational exposure to di-n-butyl phthalate (DBP) interferes with the development of the gerbil testis during the first six weeks of life. Males were evaluated at 1, 7, 14, 28, 35 and 42 days of age in an untreated (control) group or groups exposed from 8 to 23 days gestation to DBP (100mgkg-1day-1 in mineral oil) or vehicle by maternal gavage...
June 14, 2018: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/29897474/insulin-resistance-hyperinsulinemia-and-lh-relative-roles-in-peripubertal-obesity-associated-hyperandrogenemia
#9
Christine M Burt Solorzano, Karen L Knudsen, Amy D Anderson, Eleanor G Hutchens, Jessicah S Collins, James T Patrie, John C Marshall, Christopher R McCartney
Context: Peripubertal obesity is associated with variable hyperandrogenemia, but precise mechanisms remain unclear. Objective: To assess the roles of insulin resistance, hyperinsulinemia, and luteinizing hormone (LH) in peripubertal obesity-associated hyperandrogenemia. Design: Cross-sectional analysis. Setting: Academic clinical research unit. Participants: Eleven obese (body mass index-for-age ≥ 95%) peripubertal girls...
April 20, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29895265/reintroducing-testosterone-in-the-db-db-mouse-partially-restores-normal-glucose-metabolism-and-insulin-resistance-in-a-leptin-independent-manner
#10
Koichi Yabiku, Keiko Nakamoto, Akihiro Tokushige
BACKGROUND: Testosterone signals through the androgen receptor (AR) and AR knockout mice develop obesity, suggesting a functional association between AR and leptin signaling. Furthermore, physiological blood concentrations of testosterone have been found to inhibit the development of arteriosclerosis, obesity and diabetes. However, these findings have not been verified by testosterone replacement in animal models and whether or not testosterone acts directly by activating AR to enhance leptin signaling, or indirectly by its conversion into estrogen remains unclear...
June 13, 2018: BMC Endocrine Disorders
https://www.readbyqxmd.com/read/29893598/the-effect-of-speed-power-and-strength-training-and-a-group-motivational-presentation-on-physiological-markers-of-athlete-readiness-a-case-study-in-professional-rugby
#11
Benjamin G Serpell, Joshua Strahorn, Carmen Colomer, Andrew McKune, Christian Cook, Kate Pumpa
OBJECTIVE: This study examined the effect of a physical treatment (speed, power and strength training) and psychosocial treatment (group motivational presentation) on salivary testosterone (sal-T), salivary cortisol (sal-C), and sal-T to sal-C ratio (T:C) in professional rugby. METHODS: Fourteen male rugby players aged 25.9 ± 2.5 years, height 186.1 ± 6.7 cm, and body mass 104.1 ± 12.7 kg participated in this study. Testing occurred across two days on two separate occasions (week one and week two)...
June 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29892563/prevalence-of-hypovitaminosis-d-and-its-association-with-hypoadiponectinemia-and-hyperfollistatinemia-in-saudi-women-with-na%C3%A3-ve-polycystic-ovary-syndrome
#12
Osama Adnan Kensara
Aims: The association between vitamin D and polycystic ovary syndrome (PCOS) is an active area of growing research. However, data in Saudi Arabia are scarce. This study aimed to define serum 25-hydroxyvitamin D (25(OH)D) levels among Saudi women with naïve PCOS, and to investigate the associations of their 25(OH)D status with their serum adiponectin and follistatin levels, along with indices of insulin resistance and hormonal deteriorations. Methods: In this case-control observational study, 63 women with PCOS and 65 age-and body mass index (BMI)-matched control women were assessed...
June 2018: Journal of Clinical & Translational Endocrinology
https://www.readbyqxmd.com/read/29890654/cross-sectional-inverse-associations-of-obesity-and-fat-accumulation-indicators-with-testosterone-in-non-diabetic-aging-men
#13
Iwona Rotter, Aleksandra Rył, Katarzyna Grzesiak, Aleksandra Szylińska, Wioletta Pawlukowska, Anna Lubkowska, Olimpia Sipak-Szmigiel, Krzysztof Pabisiak, Maria Laszczyńska
Introduction/Objective : The aim of the study was to show which of the adipose tissue accumulation indicators correlate with testosterone disorders in non-diabetic aging men. Material and methods : 455 non diabetic men, recruited at primary care facilities, aged 50⁻75 participated in the study. The participants underwent anthropometric measurement and ELISA determination of total testosterone (TT), estradiol (E₂), dehydroepiandrosterone sulphate (DHEA-S), sex hormone binding protein (SHBG), and the determination of fasting glucose (FPG), high-density lipids cholesterol (HDL-Ch), and triacylglycerols (TAG) in serum...
June 8, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29888533/the-catch-checklist-to-investigate-adult-onset-hypogonadism
#14
REVIEW
G Defeudis, R Mazzilli, D Gianfrilli, A Lenzi, A M Isidori
Adult-onset hypogonadism is a syndrome often underdiagnosed, undertreated, or incompletely explored. There are various reasons for this: firstly, undefined age range of men in whom testosterone levels should be investigated and then no definitive serum cutoff point for the diagnosis of hypogonadism; and finally, variable and non-specific signs and symptoms; men and physicians do not pay adequate attention to sexual health. All these factors make the diagnostic criteria for hypogonadism controversial. The evaluation of the clinical features and causes of this syndrome, its link with age, the role of testosterone and other hormone levels, and the presence of any comorbidities are all useful factors in the investigation of this population...
June 10, 2018: Andrology
https://www.readbyqxmd.com/read/29887901/effect-of-chamomile-capsule-on-lipid-and-hormonal-related-parameters-among-women-of-reproductive-age-with-polycystic-ovary-syndrome
#15
Maryam Heidary, Zahra Yazdanpanahi, Mohammad Hossain Dabbaghmanesh, Mohammad Ebrahin Parsanezhad, Masoumeh Emamghoreishi, Marzieh Akbarzadeh
Background: According to traditional herbal medicine, chamomile has been considered as one of the herbal remedies for patients with polycystic ovary syndrome (PCOS). The study aimed to investigate the effect of chamomile on lipid and hormonal parameters in women of reproductive age with PCOS. Materials and Methods: This study is a randomized clinical trial which was conducted on 80 women (40 patients in each group) of childbearing age with PCO. The intervention group received 370 mg oral capsules of chamomile three times a day for 3 months...
2018: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/29887899/comparison-of-salivary-testosterone-levels-in-different-phases-of-bipolar-i-disorder-and-control-group
#16
Sabra Mousavizadegan, Mohsen Maroufi
Background: Testosterone is considered as a primary sex hormone, also known as an important anabolic steroid, that may involve in various mental disorders such as bipolar I disorder (BID). The goal of this study was to compare the testosterone salivary levels between different phases of BID and its association with the clinical features of BID. Materials and Methods: In a case-control study, 15 patients in the mania phase, 10 patients in the depression phase, and 16 in the euthymia phase were selected as patient groups...
2018: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/29887834/diabetes-mellitus-and-infertility-different-pathophysiological-effects-in-type-1-and-type-2-on-sperm-function
#17
Rosita A Condorelli, Sandro La Vignera, Laura M Mongioì, Angela Alamo, Aldo E Calogero
Although the prevalence of sub-infertility in diabetic patients in childbearing age is known, the mechanisms by which diabetes mellitus (DM) causes male infertility are not completely explained. This detrimental effect is achieved with a variety of mechanisms that include pre-testicular, testicular, and post-testicular pathogenetic moments and can be different in type 1 diabetes mellitus (DM1) and type 2 diabetes mellitus (DM2) patients because of type of diabetes, duration of disease, and glycemic metabolic compensation...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29886763/inhibin-b-in-seminiferous-tubules-of-human-testes-in-normal-spermatogenesis-and-in-idiopathic-infertility
#18
Grigory A Demyashkin
Inhibin B is one of the most significant serum markers of spermatogenesis, but its testicular expression has been poorly studied. Inhibin B sensitivity as well as the ability to reflect the level and condition of spermatogenesis and forecast certain changes in reproductive homeostasis in males is still a subject of active discussion. The purpose of this study is to examine the level of expression of inhibin B in cells of human seminiferous tubules in normal and in pathological spermatogenesis (idiopathic infertility) by revealing the proportion of immunostaining cells for inhibin B...
June 9, 2018: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/29886652/-diagnosis-and-management-of-adult-onset-idiopathic-hypogonadotropic-hypogonadism
#19
J F Mao, X Wang, B Q Yu, Y J Gao, M Nie, X Y Wu
Objective: To investigate the clinical features and management of male patients with adult-onset idiopathic hypogonadotropic hypogonadism (AIHH). Methods: Clinical features and treatment of six patients with AIHH between January 2010 and June 2017 were retrospectively reviewed. Results: The patients were all male, with an age of 26 (20-35) years old and they experienced complete pubertal development. The main complaints were decreased libido, erectile dysfunction and gynecomastia. Physical examination found that the testicular size was 15 (12-20) ml and they were fully virilized...
May 29, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29886316/a-pharmacogenetic-approach-to-improve-low-ovarian-response-the-role-of-cag-repeats-length-in-the-androgen-receptor-gene
#20
Belén Lledo, Joaquín Llácer, Jose A Ortiz, Beatriz Martinez, Ruth Morales, Rafael Bernabeu
The AR (androgen receptor) polymorphism is associated with POR risk. Furthermore, the use of androgens in POR remains controversial. Our data could clarify the effectiveness of androgen pretreatment. AR genotyping could help us to identify patients at risk for POR and POR patients that will be benefited of androgen pretreatment. OBJECTIVE: The aim of this project was to investigate if the AR (androgen receptor) polymorphism could be used to identify patients at risk for POR and that will benefit from androgens pretreatment...
June 4, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
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