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Endogenous Testosterone

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https://www.readbyqxmd.com/read/29349906/pregnancy-greatly-affect-the-steroidal-module-of-the-athlete-biological-passport
#1
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
https://www.readbyqxmd.com/read/29335782/association-of-endogenous-circulating-sex-steroids-and-condition-specific-quality-of-life-domains-in-postmenopausal-women-with-pelvic-floor-disorders
#2
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
https://www.readbyqxmd.com/read/29330698/circulating-hormones-and-mammographic-density-in-premenopausal-women
#3
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
https://www.readbyqxmd.com/read/29299723/current-smoking-is-associated-with-a-larger-waist-circumference-and-a-more-androgenic-profile-in-young-healthy-women-from-high-risk-breast-cancer-families
#4
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
https://www.readbyqxmd.com/read/29291455/high-resolution-full-scan-liquid-chromatography-mass-spectrometry-comprehensive-screening-in-sports-antidoping-urine-analysis
#5
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
https://www.readbyqxmd.com/read/29281666/circulating-sex-hormones-in-relation-to-anthropometric-sociodemographic-and-behavioural-factors-in-an-international-dataset-of-12-300-men
#6
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
https://www.readbyqxmd.com/read/29280355/muscles-of-the-trunk-and-pelvis-are-responsive-to-testosterone-administration-data-from-testosterone-dose-response-study-in-young-healthy-men
#7
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
https://www.readbyqxmd.com/read/29275030/testosterone-and-cardiovascular-health
#8
REVIEW
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
https://www.readbyqxmd.com/read/29273454/effects-of-non-contingent-cocaine-on-3-alpha-androstanediol-ii-disruption-of-lordosis-of-proestrous-rats
#9
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
https://www.readbyqxmd.com/read/29247680/changes-in-steroid-profiles-of-the-blue-mussel-mytilus-trossulus-as-a-function-of-season-stage-of-gametogenesis-sex-tissue-and-mussel-bed-depth
#10
Katarzyna Smolarz, Sandra Zabrzańska, Lucyna Konieczna, Anna Hallmann
This paper describes changes in the content of free steroid hormones e.g. testosterone (T), estradiol-17β (E2), estrone (E1) and estriol (E3) of Mytilus trossulus from the southern Baltic Sea as a function of season, stage of gametogenesis, sex, tissue (gonadal and somatic) and depth. The highest levels of T, E2, E1 and E3 were found in mussels sampled in spring and summer while the lowest levels were found in winter. This pattern was stable and was seen in both sexes and tissues in mussels from both mussel beds...
December 13, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29241825/sex-hormones-are-negatively-associated-with-vertebral-bone-marrow-fat
#11
Swaroop D Mistry, Gina N Woods, Sigurdur Sigurdsson, Susan K Ewing, Trisha F Hue, Gudny Eiriksdottir, Kaipin Xu, Joan F Hilton, Deborah M Kado, Vilmundur Gudnason, Tamara B Harris, Clifford J Rosen, Thomas F Lang, Xiaojuan Li, Ann V Schwartz
CONTEXT: Higher bone marrow fat (BMF)1 is associated with osteoporosis and reduced hematopoiesis. Exogenous estradiol reduces BMF in older women, but effects of endogenous sex hormones are unknown. OBJECTIVE: To determine if endogenous sex hormones are associated with BMF in older men and women. DESIGN, SETTING AND PARTICIPANTS: Cross-sectional study in the Age Gene/Environment Susceptibility (AGES) Reykjavik cohort. Participants using medications that may affect BMF were excluded...
December 11, 2017: Bone
https://www.readbyqxmd.com/read/29241756/gynecologic-and-andrologic-dermatology-and-the-metabolic-syndrome
#12
Maria Magdalena Roth, Nicholas Leader, George Kroumpouzos
The relationship of sex hormones to obesity and inflammation has been extensively studied. Research on endogenous and exogenous sex steroids, including studies on animal models of metabolic syndrome (MetS), has indicated that sex hormones are involved in metabolic pathways relevant to MetS. Lower testosterone levels in men and higher levels in women increase risks of MetS and type 2 diabetes mellitus (T2DM). Lower levels of sex hormone-binding globulin increase risks of MetS and T2DM in both sexes. Skin diseases that are sex hormone mediated, such as polycystic ovary syndrome, acanthosis nigricans, acne vulgaris, and pattern alopecia, have been associated with insulin resistance...
January 2018: Clinics in Dermatology
https://www.readbyqxmd.com/read/29220342/effect-of-penetration-enhancers-on-the-percuaneous-delivery-of-hormone-replacement-actives
#13
John O Trimble, Bob Light
Transdermal compositions for hormone replacement are comprised of exogenous hormones that are biochemically similar to those produced endogenously by the ovaries or elsewhere in the body. In this work, estradiol, estriol, and testosterone were loaded in transdermal vehicles, prepared using one of three selected penetration enhancer mixtures: Vehicle 1 (olive oil and oleic acid), Vehicle 2 (isopropyl palmitate and lecithin), and Vehicle 3 (isopropyl myristate and lecithin). The influence of penetration enhancers on transdermal delivery was evaluated using Franz-type diffusion cells and Normal Human 3D Model of Epidermal Tissue...
November 2017: International Journal of Pharmaceutical Compounding
https://www.readbyqxmd.com/read/29206779/concentration-range-of-serum-sex-steroids-in-normal-postmenopausal-women-and-those-with-diagnosis-of-vulvovaginal-atrophy
#14
Yuyong Ke, Alain Bélanger, Jean-Nicolas Simard, Renaud Gonthier, Céline Martel, Mario Vaillancourt, Fernand Labrie
OBJECTIVE: The aim of the study was to determine the range of serum sex-related steroids in normal postmenopausal women and in women of the same age with a diagnosis of vulvovaginal atrophy (VVA). METHODS: Validated mass spectrometry-based assays coupled to gas or liquid chromatography were used over a 10-year period for steroid measurements. Serum samples were obtained in up to 1,512 women aged 55 to 65 years. RESULTS: Serum estrone sulfate (E1S) and androsterone glucuronide (ADT-G), the main metabolites of estrogens and androgens, respectively, were 16...
December 4, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/29203165/sex-hormone-levels-in-the-brain-of-d-aspartate-treated-rats
#15
Maria Maddalena Di Fiore, Alessandra Santillo, Sara Falvo, Gabriella Chieffi Baccari, Massimo Venditti, Federica Di Giacomo Russo, Monica Lispi, Antimo D'Aniello
d-Aspartate (d-Asp) is an endogenous amino acid present in the central nervous system and endocrine glands of various animal taxa. d-Asp is implicated in neurotransmission, physiology of learning, and memory processes. In gonads, it plays a crucial role in sex hormone synthesis. We have investigated the effects of chronic (30 days d-Asp drinking solution) and acute (i.p. injection of 2μmol/g bw d-Asp) treatments on sex steroid synthesis in rat brain. Furthermore, to verify the direct effect of d-Asp on neurosteroidogenic enzyme activities, brain homogenates were incubated with different substrates (cholesterol, progesterone, or testosterone) with or without the addition of d-Asp...
December 1, 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29199649/testosterone-and-its-metabolites-differential-associations-with-cardiovascular-and-cerebrovascular-events-in-men
#16
REVIEW
Bu B Yeap
As men grow older, circulating testosterone declines while the incidence of cardiovascular disease increases. Thus, the role of sex hormones as biomarkers, and possibly contributing factors to clinical manifestations of cardiovascular disease in the increasing demographic of aging men, has attracted considerable interest. This review focuses on observational studies of endogenous androgens, namely circulating testosterone and dihydrotestosterone, which have examined their associations with cardiovascular events such as myocardial infarction and stroke...
December 1, 2017: Asian Journal of Andrology
https://www.readbyqxmd.com/read/29197795/reproductive-steroids-and-adhd-symptoms-across-the-menstrual-cycle
#17
Bethan Roberts, Tory Eisenlohr-Moul, Michelle M Martel
Although Attention-Deficit/Hyperactivity Disorder shows (ADHD) male predominance, females are significantly impaired and exhibit additional comorbid disorders during adolescence. However, no empirical work has examined the influence of cyclical fluctuating steroids on ADHD symptoms in women. The present study examined estradiol (E2), progesterone (P4), and testosterone (T) associations with ADHD symptoms across the menstrual cycle in regularly-cycling young women (N=32), examining trait impulsivity as a moderator...
November 28, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29197553/evidence-for-condition-mediated-trade-offs-between-the-hpa-and-hpg-axes-in-the-wild-zebra-finch
#18
Ondi L Crino, Sophia M Jensen, Katherine L Buchanan, Simon C Griffith
Opportunistic breeding is a strategy used to maximize reproductive success in unpredictable environments. Birds that breed opportunistically are thought to maintain partial activation of the reproductive axis in order to rapidly initiate breeding when environmental conditions become suitable. The physiological mechanisms that modulate reproduction in seasonally breeding birds have been well explored. In contrast, the physiological mechanisms that allow opportunistic breeding birds to maintain a continued state of reproductive readiness has not been well established...
November 29, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29194818/rapid-non-genomic-modulation-by-neurosteroids-of-dendritic-spines-in-the-hippocampus-androgen-estrogen-and-corticosteroid
#19
REVIEW
Gen Murakami, Yasushi Hojo, Asami Kato, Yoshimasa Komatsuzaki, Shigeo Horie, Mika Soma, Jonghyuk Kim, Suguru Kawato
Memories are stored in synapses which consist of axon terminals and dendritic spines. Dendritic spines are postsynaptic structures of synapses and essential for synaptic plasticity and cognition. Therefore, extensive investigations about functions and structures of spines have been performed. Sex steroids and stress steroids have been shown to modulate hippocampal synapses. Although rapid modulatory action of sex steroids on synapses has been studied in hippocampal neurons over several decades, its essential molecular mechanisms have not been fully understood...
December 1, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/29193847/genetic-loss-of-diazepam-binding-inhibitor-in-mice-impairs-social-interest
#20
A L Ujjainwala, C D Courtney, S G Rhoads, J S Rhodes, C A Christian
Neuropsychiatric disorders in which reduced social interest is a common symptom, such as autism, depression, and anxiety, are frequently associated with genetic mutations affecting γ-aminobutyric acid (GABA)ergic transmission. Benzodiazepine treatment, acting via GABA type-A receptors, improves social interaction in male mouse models with autism-like features. The protein diazepam binding inhibitor (DBI) can act as an endogenous benzodiazepine, but a role for DBI in social behavior has not been described. Here, we investigated the role of DBI in the social interest and recognition behavior of mice...
November 28, 2017: Genes, Brain, and Behavior
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