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Endogenous Testosterone

Lucyna Konieczna, Mariusz Belka, Magdalena Okońska, Magdalena Pyszka, Tomasz Bączek
In recent years, there has been an increasing worldwide interest in the use of alternative sample preparation methods that are proceeded by separation techniques. Fused deposition modeling (FDM) is a 3D printing technique that is based the consecutive layering of softened/melted thermoplastic materials. In this study, a group of natural steroids and sexual hormones - namely, aldosterone, cortisol, β-estradiol, testosterone, dihydrotestosterone, and synthetic methyltestosterone and betamethasone - were separated and determined using an optimized high-performance liquid chromatography coupled to mass spectrometry (LC-MS) method in positive ionization mode...
February 21, 2018: Journal of Chromatography. A
Dong-Mei Su, Ying Feng, Lin Wang, Yi-Lun Wu, Ren-Shan Ge, Xue Ma
Leydig cells are the main endogenous testosterone synthesis cells in the body. Testosterone is an essential hormone in males that affects metabolism, emotion, and pubertal development. However, little is known about the development of Leydig cells and relationship between fetal Leydig cells (FLCs) and adult Leydig cells (ALCs). The aims of this study were to investigate the effect of (FLCs) on ALC development. Our study showed that FLCs in neonatal rat testis can be eliminated by 100 mg/kg ethane dimethane sulfonate (EDS) treatment without affecting the health of newborn rats...
March 6, 2018: Journal of Reproduction and Development
Lei Zhihai
Neuropeptide B (NPB) is an endogenous ligand for the orphan G protein-coupled receptors NPBWR1 (GPR7) and NPBWR2 (GPR8). Some reports have investigated the role of NPB in the regulation of feeding, energy metabolism and hormone secretion in many species. However, few papers reported the physiological function of NPB in the pig. In this study, we cloned and sequenced the NPB mRNA from a pig, which was found to consist of 123 bases. NPB mRNA expression was detected in central and peripheral tissues by the quantitative fluorescence method...
February 23, 2018: General and Comparative Endocrinology
Normaliza Abdul Manaf, Bahruddin Saad, Mohamed H Mohamed, Lee D Wilson, Aishah A Latiff
Sorbents were prepared by cross-linking β-cyclodextrin (β-CD) using two different types of cross-linker units at variable reactant mole ratios. The resulting polymers containing β-CD were evaluated as sorbents in micro-solid phase extraction (μ-SPE) format for the extraction of the endogenous steroids testosterone (T), epitestosterone (E), androsterone (A), etiocholanolone (Etio), 5α-androstane-3α,17β-diol (5αAdiol) and 5β-androstane-3α,17β-diol (5βAdiol). The best sorbent (C1; cyclodextrin polymer) showed superior extraction characteristics compared with commercial sorbents (C18 and Bond Elut Plexa)...
February 20, 2018: Journal of Chromatography. A
Min Pi, Karan Kapoor, Ruisong Ye, Jeremy C Smith, Jerome Baudry, L Darryl Quarles
SCOPE: The molecular mechanisms whereby gallates in green tea exert metabolic effects are poorly understood. METHODS AND RESULTS: We found that GPRC6A, a multi-ligand sensing G-protein coupled receptor that regulates energy metabolism, sex hormone production and prostate cancer progression, is a target for gallates. Sodium gallate,1 gallic acid (GA) > ethyl gallate (EG) > octyl gallate (OG) dose dependently activated ERK in HEK-293 cells transfected with GPRC6A but not in non-transfected controls...
February 21, 2018: Molecular Nutrition & Food Research
Gellért Karvaly, Krisztián Kovács, Katalin Mészáros, Ibolya Kocsis, Attila Patócs, Barna Vásárhelyi
The perturbation of the homeostasis of adrenocortical steroids plays a fundamental role in several pathological conditions. Currently, only a few of the substances involved in steroidogenesis are routinely analysed in clinical laboratories for the diagnosis of these conditions. Recently, interest has grown over the development of clinical assays of endogenous steroids using liquid chromatography-tandem mass spectrometry (LC-MS/MS). However, no approaches have assessed the adrenocortical steroidogenesis comprehensively...
February 3, 2018: Journal of Pharmaceutical and Biomedical Analysis
Youwei Bi, Paul J Perry, Michael Ellerby, Daryl J Murry
A randomized, double-blind clinical trial was conducted to investigate long-term abuse effects of testosterone cypionate. Thirty-one healthy males were randomized into a dose group of 100, 250 or 500mg/wk and received 14 weekly injections of TC. A PK-PD model was developed to characterize testosterone concentrations and link exposure to change in luteinizing hormone and spermatogenesis following long-term TC administration. A linear one-compartment model best described the concentration-time profile of total testosterone...
February 13, 2018: CPT: Pharmacometrics & Systems Pharmacology
Jingwei Zhang, Bisheng Huang, Guanghui Hu, Xiangcheng Zhan, Tiancheng Xie, Saiyang Li, Xiaolu Zhang, Huitao Li, Ren-Shan Ge, Yunfei Xu
Aldosterone (ALDO) is a primary endogenous mineralocorticoid, appearing as the main hormone controlling sodium and water homeostasis. Its emerging role in the development of many organs has gained interest over the past few years. In the testis, Leydig cells contain mineralocorticoid receptors and ALDO stimulates androgen synthesis via the mineralocorticoid receptors in rat adult Leydig cells. Although ALDO pharmacologically promoted the Leydig cell function, its role in Leydig cell development was unclear...
2018: Frontiers in Endocrinology
Merja R Häkkinen, Taija Heinosalo, Niina Saarinen, Tero Linnanen, Raimo Voutilainen, Timo Lakka, Jarmo Jääskeläinen, Matti Poutanen, Seppo Auriola
An LC-MS/MS method was developed and validated to analyze simultaneously estrogens (estradiol, E2; estrone, E1), androgens (testosterone, T; androstenedione, A4; dehydroepiandrosterone, DHEA), progestagens (17a-hydroxypregnenolone, 17OHP5; 17a-hydroxyprogesterone, 17OHP4; progesterone, P4), glucocorticoids (cortisol, F; cortisone E; corticosterone, B; 11-deoxycortisol, S; 21-hydroxyprogesterone, 21OHP4), and mineralocorticoids (aldosterone, A) from 150 μl of human serum, plasma, or endometrium and endometriotic tissue homogenates...
January 31, 2018: Journal of Pharmaceutical and Biomedical Analysis
Sina Radke, Theresa Kalt, Lisa Wagels, Birgit Derntl
Motivational tendencies to happy and angry faces are well-established, e.g., in the form of aggression. Approach-avoidance reactions are not only elicited by emotional expressions, but also linked to the evaluation of stable, social characteristics of faces. Grounded in the two fundamental dimensions of face-based evaluations proposed by Oosterhof and Todorov (2008), the current study tested whether emotionally neutral faces varying in trustworthiness and dominance potentiate approach-avoidance in 50 healthy male participants...
2018: Frontiers in Behavioral Neuroscience
Emily J Meyer, Gary Wittert
In men, obesity and metabolic complications are associated with lower serum testosterone (T) and dihydrotestosterone (DHT) and an increased risk of, and mortality from, multiple chronic diseases in addition to cardiovascular disease (CVD). The causal interrelationships between these factors remain a matter of debate. In men with untreated congenital and lifelong forms of hypogonadotropic hypogonadism, there appears to be no increased risk. Men with Klinefelter's syndrome have an increased risk of various types of cancers, as well as CVD, which persist despite T therapy...
January 30, 2018: Asian Journal of Andrology
Jenny Mullen, Yifat Gadot, Emma Eklund, Alexander Andersson, Jenny J Schulze, Magnus Ericsson, Angelica Lindén Hirschberg, Anders Rane, Lena Ekström
Concentrations of urinary steroids are measured in anti-doping test programs to detect doping with endogenous steroids. These concentrations are combined into ratios and followed over time in the steroidal module of the Athlete Biological Passport (ABP). The most important ratio in the ABP is the testosterone/epitestosterone (T/E) ratio but this ratio is subject to intra-individual variations, especially large in women, which complicates interpretation. In addition there are other factors affecting T/E, pregnancy for example is known to affect the urinary excretion rate of epitestosterone and hence the T/E ratio...
January 18, 2018: Drug Testing and Analysis
Barbara Bodner-Adler, Klaus Bodner, Oliver Kimberger, Ksenia Halpern, Heinz Koelbl, Wolfgang Umek
OBJECTIVE: To examine the relationship between endogenous sex steroids and various condition-specific quality of life domains in postmenopausal women with pelvic floor disorders. We hypothesized that woman with lowest androgen and estradiol concentrations would report worse scores of quality of life domains. METHODS: Forty-six women with pelvic organ prolapse (POP) and 47 cases with stress urinary incontinence (SUI) answered the validated pelvic floor questionnaire and underwent serum sex steroid measurement...
January 15, 2018: Archives of Gynecology and Obstetrics
Kimberly A Bertrand, A Heather Eliassen, Susan E Hankinson, Bernard A Rosner, Rulla M Tamimi
Prior research suggests that several endogenous hormones in premenopausal women are associated with breast cancer risk; however, few studies have evaluated associations of endogenous hormones with mammographic density (MD) in premenopausal women. We conducted a cross-sectional study of plasma hormone levels in relation to MD among 634 cancer-free premenopausal women in the Nurses' Health Study II. We measured percent MD from screening mammograms using a computer-assisted method. We assayed estradiol, estrone, and estrone sulfate in blood samples timed in early follicular and mid-luteal phases of the menstrual cycle as well as testosterone, androstenedione, progesterone, dehydroepiandrosterone (DHEA), DHEA sulfate, sex hormone-binding globulin (SHBG), and anti-Müllerian hormone in luteal or untimed samples...
January 12, 2018: Hormones & Cancer
Carolina Ellberg, Håkan Olsson, Helena Jernström
The purpose was to elucidate the interplay between current smoking, anthropometric measurements, and endogenous hormone levels in women ≤ 40 years. Questionnaires on lifestyle and reproductive factors were completed by 269 healthy women from high-risk breast cancer families between 1996 and 2006 in Sweden. Blood samples for analyses of plasma testosterone, estradiol, androstenedione, sex hormone-binding globulin, and body measurements were obtained 5-10 days before predicted onset of the next menstrual period...
January 3, 2018: Cancer Causes & Control: CCC
Wadha Abushareeda, Ariadni Vonaparti, Khadija Al Saad, Moneera Almansoori, Mbarka Meloug, Amal Saleh, Rodrigo Aguilera, Yiannis Angelis, Peter L Horvatovich, Arjen Lommen, Mohammed Alsayrafi, Costas Georgakopoulos
The aim of this paper is to present the development and validation of a high-resolution full scan (HR-FS) electrospray ionization (ESI) liquid chromatography coupled to quadrupole Orbitrap mass spectrometer (LC/Q/Orbitrap MS) platform for the screening of prohibited substances in human urine according to World Antidoping Agency (WADA) requirements. The method was also validated for quantitative analysis of six endogenous steroids (epitestosterone, testosterone, 5α-dihydrotestosterone, dehydroepiandrosterone, androsterone and etiocholanolone) in their intact sulfates form...
December 21, 2017: Journal of Pharmaceutical and Biomedical Analysis
Eleanor L Watts, Paul N Appleby, Demetrius Albanes, Amanda Black, June M Chan, Chu Chen, Piera M Cirillo, Barbara A Cohn, Michael B Cook, Jenny L Donovan, Luigi Ferrucci, Cedric F Garland, Graham G Giles, Phyllis J Goodman, Laurel A Habel, Christopher A Haiman, Jeff M P Holly, Robert N Hoover, Rudolf Kaaks, Paul Knekt, Laurence N Kolonel, Tatsuhiko Kubo, Loïc Le Marchand, Tapio Luostarinen, Robert J MacInnis, Hanna O Mäenpää, Satu Männistö, E Jeffrey Metter, Roger L Milne, Abraham M Y Nomura, Steven E Oliver, J Kellogg Parsons, Petra H Peeters, Elizabeth A Platz, Elio Riboli, Fulvio Ricceri, Sabina Rinaldi, Harri Rissanen, Norie Sawada, Catherine A Schaefer, Jeannette M Schenk, Frank Z Stanczyk, Meir Stampfer, Pär Stattin, Ulf-Håkan Stenman, Anne Tjønneland, Antonia Trichopoulou, Ian M Thompson, Shoichiro Tsugane, Lars Vatten, Alice S Whittemore, Regina G Ziegler, Naomi E Allen, Timothy J Key, Ruth C Travis
INTRODUCTION: Sex hormones have been implicated in the etiology of a number of diseases. To better understand disease etiology and the mechanisms of disease-risk factor associations, this analysis aimed to investigate the associations of anthropometric, sociodemographic and behavioural factors with a range of circulating sex hormones and sex hormone-binding globulin. METHODS: Statistical analyses of individual participant data from 12,330 male controls aged 25-85 years from 25 studies involved in the Endogenous Hormones Nutritional Biomarkers and Prostate Cancer Collaborative Group...
2017: PloS One
J Tapper, S Arver, K M Pencina, A Martling, L Blomqvist, C Buchli, Z Li, T Gagliano-Jucá, T G Travison, G Huang, T W Storer, S Bhasin, S Basaria
Testosterone dose-dependently increases appendicular muscle mass. However, the effects of testosterone administration on the core muscles of the trunk and the pelvis have not been evaluated. The present study evaluated the effects of testosterone administration on truncal and pelvic muscles in a dose-response trial. Participants were young healthy men aged 18-50 years participating in the 5α-Reductase (5aR) Trial. All participants received monthly injections of 7.5 mg leuprolide acetate to suppress endogenous testosterone production and weekly injections of 50, 125, 300, or 600 mg of testosterone enanthate and were randomized to receive either 2...
January 2018: Andrology
Andrew Elagizi, Tobias S Köhler, Carl J Lavie
There is an ongoing debate in the medical community regarding the effects of testosterone on cardiovascular (CV) health. For decades, there has been conflicting evidence regarding the association of endogenous testosterone levels and CV disease (CVD) events that has resulted in much debate and confusion among health care providers and patients alike. Testosterone therapy has become increasingly widespread, and after the emergence of studies that reported increased CVD events in patients receiving testosterone therapy, the US Food and Drug Administration (FDA) released a warning statement about testosterone and its potential risk regarding CV health...
December 20, 2017: Mayo Clinic Proceedings
Amy S Kohtz, Alicia A Walf, Cheryl A Frye
Drug use influences sexual behavior, performance, and can be associated with increased sexual risk-taking. Our prior results using an animal model indicate that progestogens contribute to hormonally-mediated changes in sexual behavior of female rodents during acute cocaine exposure. Androgens, such as testosterone, and its metabolite 3ɑ-androstanediol (3α-diol), and estradiol, are known to influence male sexual behavior, but can also alter the expression of sexual behavior of female rodents. As such, we investigated the influence of endogenous androgen and estradiol fluctuations on cocaine-mediated changes in motor behavior and sexual receptivity of rats during diestrous or proestrous phases of the estrous cycle...
December 19, 2017: Physiology & Behavior
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