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Endogenous Testosterone

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https://www.readbyqxmd.com/read/29788255/reproductive-hormones-and-subclinical-cardiovascular-disease-in-midlife-women
#1
Rebecca C Thurston, Shalender Bhasin, Yuefang Chang, Emma Barinas Mitchell, Karen A Matthews, Ravi Jasuja, Nanette Santoro
Context: Reproductive hormones are understood to be important to the pathophysiology of cardiovascular disease (CVD) in women. However, standard estradiol (E2) and testosterone (T) assays lack sensitivity at the levels of postmenopausal women. Objective: Investigate relations of mass spectrometry-assessed estrone (E1), estradiol (E2), and testosterone (T), and sex hormone binding globulin (SHBG) and subclinical CVD in women. Design, Setting, Participants: 304 peri- and postmenopausal women, aged 40-60 years, and free of clinical CVD underwent subclinical CVD measurements...
May 18, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29769663/endogenous-testosterone-and-exogenous-oxytocin-influence-the-response-to-baby-schema-in-the-female-brain
#2
Sarah K C Holtfrerich, Roland Pfister, Alexander T El Gammal, Eugen Bellon, Esther K Diekhof
Nurturing behavior may be critically influenced by the interplay of different hormones. The neuropeptide oxytocin is known to promote maternal behavior and its reduction has been associated with postpartum depression risk and child neglect. Contrariwise, the observed decrease in testosterone level during early parenthood may benefit caretaking behavior, whereas increased testosterone may reduce attention to infants. Here we used functional magnetic resonance imaging to investigate the interactive influence of testosterone and oxytocin on selective attention to and neural processing of the baby schema (BS)...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29744800/trait-and-state-patterns-of-basolateral-amygdala-connectivity-at-rest-are-related-to-endogenous-testosterone-and-aggression-in-healthy-young-women
#3
Macià Buades-Rotger, Christin Engelke, Ulrike M Krämer
The steroid hormone testosterone (T) has been suggested to influence reactive aggression upon its action on the basolateral amygdala (BLA), a key brain region for threat detection. However, it is unclear whether T modulates resting-state functional connectivity (rsFC) of the BLA, and whether this predicts subsequent aggressive behavior. Aggressive interactions themselves, which often induce changes in T concentrations, could further alter BLA rsFC, but this too remains untested. Here we investigated the effect of endogenous T on rsFC of the BLA at baseline as well as after an aggressive encounter, and whether this was related to behavioral aggression in healthy young women (n = 39)...
May 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29733874/diffuse-noxious-inhibitory-controls-and-brain-networks-are-modulated-in-a-testosterone-dependent-manner-in-sprague-dawley-rats
#4
Joyce T Da Silva, Youping Zhang, Jamila Asgar, Jin Y Ro, David A Seminowicz
Diffuse noxious inhibitory control (DNIC), which involves endogenous pain modulation, has been investigated as a potential mechanism for the differences in pain modulation observed between men and women, though the literature shows contradictory findings. We used a capsaicin-induced DNIC behavioral assay and resting state functional magnetic resonance imaging (rsfMRI) to assess the effect of testosterone on pain modulation and related brain circuitry in rats. We hypothesized that testosterone is required for DNIC that leads to efficient pain inhibition by increasing descending pain modulation...
May 4, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29732458/hepatocellular-carcinoma-virilization-and-hilus-cell-hyperplasia-in-a-girl-with-turner-syndrome
#5
Jennifer R Law, Sang Lee, Eizaburo Sasatomi, Christine E Bookhout, Julie Blatt
Patients with Turner syndrome (TS) are known to be at risk for excess androgen production and virilization associated with gonadoblastoma and Y chromosome mosaicism, and excess androgens are a risk factor for the development of hepatocellular carcinoma. However, virilization and hepatocellular carcinoma have not been described in a patient with TS. A 10-year-old with nonmosaic 45,X TS presented with clitoromegaly, accelerated linear growth velocity, advanced bone age, and elevated testosterone levels as well as a second occurrence of hepatocellular carcinoma...
May 1, 2018: Journal of the Endocrine Society
https://www.readbyqxmd.com/read/29730483/individual-differences-in-risk-taking-and-endogeneous-levels-of-testosterone-estradiol-and-cortisol-a-systematic-literature-search-and-three-independent-meta-analyses
#6
REVIEW
Jennifer Kurath, Rui Mata
Hormonal levels have been hypothesized to serve as proximal biological mechanisms underlying individual differences in risk taking. We conducted a systematic literature search and independent meta-analyses to assess the link between endogenous testosterone, estradiol, and cortisol levels and risk-taking related constructs (i.e., risk-taking propensity, impulsivity, sensation seeking, novelty seeking). We found small correlations between risk-taking constructs and testosterone (r = 0.12, 95% CI = 0.08, 0...
May 3, 2018: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/29728876/kisspeptin-and-lh-pulsatile-temporal-coupling-in-pcos-patients
#7
Krzysztof Katulski, Agnieszka Podfigurna, Adam Czyzyk, Blazej Meczekalski, Alessandro D Genazzani
PURPOSE: To evaluate the temporal coupling between spontaneous kisspeptin and luteinizing hormone (LH) pulsatile releases in polycystic ovary syndrome (PCOS) patients. METHODS: We examined 71 patients diagnosed with PCOS. A 2 h pulsatility study was performed to evaluate serum kisspeptin and LH pulse frequency and concentration, sampled every 10 min; baseline follicle-stimulating hormone (FSH), estradiol (E2), prolactin (PRL), cortisol, 17-hydroksy-progesterone (17OHP), testosterone (T), free testosterone index (FTI, and insulin levels were also measured...
May 4, 2018: Endocrine
https://www.readbyqxmd.com/read/29703118/endogenous-testosterone-does-not-improve-prediction-of-incident-cardiovascular-disease-in-a-community-based-cohort-of-adult-men-results-from-the-tehran-lipid-and-glucose-study
#8
Hossein Hatami, Donna Parizadeh, Razieh Bidhendi Yarandi, Maryam Tohidi, Fahimeh Ramezani Tehrani
INTRODUCTION: To explore the predictive value of testosterone added to the Framingham Risk Score (FRS) for cardiovascular disease (CVD). METHODS: Among 816 men, 30-70 years/old, without prevalent CVD, from a community-based cohort (Tehran Lipid and Glucose Study), we assessed the predictive value of testosterone with incident CVD, using three multivariate Cox proportional-hazards models. Model I: FRS variables; model II: Model I plus total testosterone; model III: Model II plus Systolic blood pressure (SBP) * total testosterone (the best fit interaction-term between testosterone and FRS variables)...
April 27, 2018: Aging Male: the Official Journal of the International Society for the Study of the Aging Male
https://www.readbyqxmd.com/read/29687691/side-effects-of-anabolic-steroids-used-by-athletes-at-unaizah-gyms-saudi-arabia-a-pilot-study
#9
Amer A Almaiman, Sulaiman H Almaiman, Elsayed I Elagamy, Osama Al Wutayd, Mohammed Almarzuqi, Rayyan Alzunaidi, Sami Alhatlani, Eltayeb E Eid
BACKGROUND: A large number of Saudi athletes are recently shown to use androgenic anabolic steroid (AAS) products to achieve rapid muscle growth without realizing the serious health risks of these drugs. Aim of this study was to elucidate the side effects encountered with prolonged use of AAS products by Saudi athletes. METHODS: A cross-sectional study was conducted, in which 16 regular gym members, 12 of them used AAS, were asked to answer a questionnaire and provide blood samples following current AAS course completion...
April 20, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29627396/characterization-of-circulating-steroid-hormone-profiles-in-the-bottlenose-dolphin-tursiops-truncatus-by-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms
#10
Thomas M Galligan, Lori H Schwacke, Dorian S Houser, Randall S Wells, Teri Rowles, Ashley S P Boggs
Systemic steroid hormone measurements are often used in the assessment of reproductive, developmental, and stress physiology in vertebrates. In protected wildlife, such as the common bottlenose dolphin (Tursiops truncatus), these measures can provide critical information about health and fitness to aid in effective conservation and management. Circulating steroid hormone concentrations are typically measured by immunoassays, which have imperfect specificity and are limited to the measurement of a single hormone per assay...
April 5, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29625166/neuroprotective-effect-of-a-physiological-ratio-of-testosterone-and-estradiol-on-corticosterone-induced-apoptosis-in-pc12-cells-via-traf6-tak1-pathway
#11
Rui Peng, Wen Dai, Yan Li
Clinical and experimental studies suggested that testosterone or estradiol alone supplementation may have antidepressant-like effects. However, the synergistic effect of testosterone/estradiol on the treatment of depression and the underlying mechanism remain largely unknown. Here, we hypothesized that an appropriate dosage of testosterone combined with estradiol may became a new therapeutic strategy in depression. Our results indicated that an appropriate testosterone/estradiol ratio of 10:1 (10-8  mol/L testosterone and 10-9  mol/L estradiol) was found, which has a significant synergistic anti-apoptotic effect on PC12 cells injury stimulated by corticosterone...
April 3, 2018: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/29625121/is-there-any-value-in-measuring-vertebrate-steroids-in-invertebrates
#12
REVIEW
Alexander P Scott
This brief review questions the belief that just because it is possible to measure vertebrate steroids (such as estradiol-17β, testosterone and progesterone) in the tissues of invertebrates, this necessarily means that they are endogenously derived or are hormones. There is a surprisingly large number of studies, mainly on mollusks, showing that they can readily absorb vertebrate steroids from the environment. They are also able to conjugate these steroids to fatty acids with great efficiency, and subsequently retain them for very long periods (with half-lives measured in weeks rather than days)...
April 3, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29560447/currently-available-murine-leydig-cell-lines-can-be-applied-to-study-early-steps-of-steroidogenesis-but-not-testosterone-synthesis
#13
Roger T Engeli, Cornelia Fürstenberger, Denise V Kratschmar, Alex Odermatt
Androgen biosynthesis in males occurs to a large extent in testicular Leydig cells. This study focused on the evaluation of three murine Leydig cell lines as potential screening tool to test xenobiotics interfering with gonadal androgen synthesis. The final step of testosterone (T) production in Leydig cells is catalyzed by the enzyme 17β-hydroxysteroid dehydrogenase 3 (17β-hsd3). The endogenous 17β-hsd3 mRNA expression and Δ4-androstene-3,17-dione (AD) to T conversion were determined in the murine cell lines MA-10, BLTK1 and TM3...
February 2018: Heliyon
https://www.readbyqxmd.com/read/29556180/no-evidence-for-a-relationship-between-hair-testosterone-concentrations-and-2d-4d-ratio-or-risk-taking
#14
Richard Ronay, Leander van der Meij, Janneke K Oostrom, Thomas V Pollet
Using a recently developed alternative assay procedure to measure hormone levels from hair samples, we examined the relationships between testosterone, cortisol, 2D:4D ratio, overconfidence and risk taking. A total of 162 (53 male) participants provided a 3 cm sample of hair, a scanned image of their right and left hands from which we determined 2D:4D ratios, and completed measures of overconfidence and behavioral risk taking. While our sample size for males was less than ideal, our results revealed no evidence for a relationship between hair testosterone concentrations, 2D:4D ratios and risk taking...
2018: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29551993/gonadal-hormones-and-retinal-disorders-a-review
#15
REVIEW
Raffaele Nuzzi, Simona Scalabrin, Alice Becco, Giancarlo Panzica
Aim: Gonadal hormones are essential for reproductive function, but can act on neural and other organ systems, and are probably the cause of the large majority of known sex differences in function and disease. The aim of this review is to provide evidence for this hypothesis in relation to eye disorders and to retinopathies in particular. Methods: Epidemiological studies and research articles were reviewed. Results: Analysis of the biological basis for a relationship between eye diseases and hormones showed that estrogen, androgen, and progesterone receptors are present throughout the eye and that these steroids are locally produced in ocular tissues...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29551255/sex-steroids-sex-hormone-binding-globulin-and-levels-of-n-terminal-pro-brain-natriuretic-peptide-in-postmenopausal-women
#16
Marija Glisic, Lyda Z Rojas, Eralda Asllanaj, Kris G Vargas, Maryam Kavousi, M Arfan Ikram, Bart C J M Fauser, Joop S E Laven, Taulant Muka, Oscar H Franco
BACKGROUND: Amino-terminal pro-B-type natriuretic peptide (NT-proBNP) has a well-documented prognostic value for cardiovascular disease and sex-hormones are suggested to modulate NT-proBNP levels. OBJECTIVE: To examine whether endogenous sex-hormones and sex hormone-binding globulin (SHBG) are associated with NT-proBNP levels in postmenopausal women free of clinical cardiovascular diseases. METHODS: Total estradiol (E2 ), total testosterone (TT), androstenedione (AD), dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulfate (DHEAS), sex hormone-binding globulin (SHBG) and NT-proBNP were assessed in 4112 postmenopausal women free of cardiovascular diseases from the prospective population-based Rotterdam Study...
June 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29549104/short-term-effects-of-transdermal-estradiol-in-men-undergoing-androgen-deprivation-therapy-for-prostate-cancer-a-randomized-placebo-controlled-trial
#17
RANDOMIZED CONTROLLED TRIAL
Nicholas Russell, Rudolf Hoermann, Ada S Cheung, Michael Ching, Jeffrey D Zajac, David J Handelsman, Mathis Grossmann
OBJECTIVE: There is increasing recognition that, in men, some biological actions attributed to testosterone (TS) are mediated by estradiol (E2). This study used two low doses of daily transdermal E2 gel to assess the effects on circulating E2 concentrations in men with prostate cancer with suppressed endogenous E2 production arising from androgen deprivation therapy (ADT). Secondarily, we aimed to assess short-term biological effects of E2 add-back without increasing circulating TS. DESIGN: 28-day randomised, placebo-controlled trial...
May 2018: European Journal of Endocrinology
https://www.readbyqxmd.com/read/29523348/new-3d-printed-sorbent-for-extraction-of-steroids-from-human-plasma-preceding-lc-ms-analysis
#18
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...
April 13, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29515056/influence-of-fetal-leydig-cells-on-the-development-of-adult-leydig-cell-population-in-rats
#19
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
https://www.readbyqxmd.com/read/29481768/cloning-and-mrna-expression-of-npb-and-its-effect-on-hormone-secretion-of-the-reproductive-cells-in-the-pig
#20
Sheng Yang, Zhiyu Ma, Chuan Suo, Ling Cheng, Juan Su, Zhihai Lei
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...
May 15, 2018: General and Comparative Endocrinology
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