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Showing 1 to 20 of 31 for “"Androstenedione"”.
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The Osteogenic Effects of 12 Weeks of Oral Supplementation of Androstenedione in Middle-Aged Men.
… supplementation with an aromatizable androgen (androstenedione) may stimulate increases in BMD.</p><p>BMD (measured by dual energy x-ray absorptiometry) and biochemical markers of bone turnover (1, 25 OH2 Vitamin D, calcitonin, deoxypyrodinoline, and parathyroid hormone) were assessed before and …
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ΤΡΟΠΟΠΟΙΗΣΗ ΤΟΥ ΑΝΟΣΟΠΟΙΗΤΙΚΟΥ ΣΥΣΤΗΜΑΤΟΣ ΤΗΣ ΑΙΓΑΣ ΓΙΑ ΑΥΞΗΣΗ ΤΟΥ ΡΥΘΜΟΥ ΑΝΑΠΑΡΑΓΩΓΗΣ
THE INDUCTION OF ACTIVE IMMUNIZATION AGAINST ANDROSTENEDIONE IN INDEGENOUS DAIRY GOATS AND THE EFFECT ON THE FUNCTION OF REPRODUCTIVE AND ENDOCRINE SYSTEMS WAS STUDIED IN THE PRESENT RESEARCH. A TOTAL OF THREE (3) EXPERIMENTS WERE CONDUCTED DURING A PERIOD OF FOUR YEARS (1984-1988). IN CONCLUSION …
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Intrauterine position in pigs: effects on conceptus development and fetal fluids steroid content
… fluid volume) and seven steroids (progesterone, androstenedione, dehydroepiandrosterone, dehydroepiandrosterone sulfate, testosterone, estrone and estrone sulfate) were evaluated. Four fetal positions were studied: females between females (f2F), females between males (fOF) , males between females …
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The acute effects of transdermal testosterone precursor administration on serum steroid hormone levels in females
… surface of the upper arm on the serum levels of androstenedione, and free and total testosterone in female subjects. Serum levels were measured before application and every 45 minutes thereafter for six hours. Serum androstenedione, and free and total testosterone levels were analyzed using …
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The Role of 5-Alpha Reductase 3 In Steroid Metabolism
… Steroid substrates (testosterone, progesterone, androstenedione, epitestosterone, 11-ketotestosterone, 11α-hydroxytestosterone, 11β-hydroxytestosterone, 6β-hydroxytestosterone, and cortisol) were added to transfected HEK293 cells. The dual 5-alpha reductase 1 and 2 inhibitor, dutasteride, was …
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Validation of the obese Ossabaw miniature pig as a model of the obese polycystic ovary syndrome phenotype with concomitant metabolic syndrome: exploration of polycystic ovary syndrome pathophysiology using in vivo and in vitro
… size ovarian cysts; 3) both OSS sows (androstenedione only) and gilts (androstenedione and DHEAS) became hyperandrogenemic; 4) both OSS sows and gilts developed protracted estrous cycle length; 5) both OSS sows and gilts developed increased numbers of medium (3.5-6.5 mm) and large …
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The effect of ACTH and progesterone on semen characteristics, blood hormones and testicular histology in the bull
… response in total corticoids, testosterone and androstenedione was monitored in Experiment 1. During Experiment 2 corticoids, testosterone, LH and progesterone concentrations were monitored. Corticoid concentrations were determined by competitive protein binding; androstenedione, progesterone, …
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Spectroscopic characterization of iron-oxygen intermediates in human aromatase (CYP19A1)
… with its androgenic substrates, testosterone and androstenedione, CYP19A1 forms estradiol and estrone utilizing one molecule of atmospheric oxygen and two reducing equivalents in the form of NADPH. This is accomplished in a three-step process one of which involves a carbon-carbon bond scission and …
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Význam androgenů adrenálního původu u syndromu polycystických ovarií a hirsutismu
… formed in the adrenal cortex is 11β-hydroxy-androstenedione. This steroid also has low androgenic potency, but its importance lies in the fact that it serves as a precursor of the active androgens - 11-oxygenated derivatives of testosterone and dihydrotestosterone. Besides their high …
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Effect of extra-gonadal sperm depletion on steroid hormone profiles in semen of bulls
Profiles for testosterone (T), androstenedione (A), dehydroepiandrosterone (DHEA), and progesterone (P) in bovine semen were established for a group of four post-pubertal bulls by depleting the bulls' extra-gonadal sperm reserves (EGR) on three occasions at two week intervals. Each depletion …
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Steroid 2,4-Dinitrophenylhydrazones: their preparation, separation, and characterization
… other of type 1b. The steroids studied were Δ4-androstenedione, progesterone and 11α-hydroxyprogesterone. These compounds were red-orange to red (λmax = 380-382, εmax. = 49,300 ± 500) and decomposed before melting. Group 2b. - DNPH's of diketonic steroids, as in group 2a., but with a hydroxyl …
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Temporal profile of gonadal steroids in populations of roosters divergently selected for mating frequency
… differing in sexual activity. Plasma levels of androstenedione (AE), dihydrotestosterone (DHT), testosterone (T), total androgens (Total A) and estradiol-17<sub>β</sub> (E₂) were measured at 1, 56, 112 and 168 days of age by radioimmunoassay. No significant differences in mean hormone values …
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Η επίδραση της κετοκοναζόλης στην ιδιοπαθή ορμονοεξαρτώμενη τριχοφυΐα
… of Testosterone, DHEA-S, SHBG and A4-Androstenedione. The above profile showed a considerable variation within the population. Nonetheless certain patterns of hormonal changes were noticed between the patients. [...]
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Equol inhibits growth, induces atresia, and inhibits steroidogenesis of mouse antral follicles
… decreased the levels of estradiol, testosterone, androstenedione, and progesterone, and decreased mRNA levels of cholesterol side-chain cleavage, steroid 17-α-hydroxalase, and aromatase compared to control. Collectively, these data suggest that equol alters antral follicle function by inhibiting …
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Rapid social regulation of 3β-HSD activity in the songbird brain
… isomerase (3β-HSD) catalyzes DHEA conversion to androstenedione (AE) and the cofactor NAD⁺ assists in this transformation. In this thesis, I asked whether brain 3β-HSD activity is regulated by social encounters in seasonally breeding male songbirds. In Experiment 1, I looked at the long-term …
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Ecotoxicogenomic New Approach Methods for Screening Development in Danio rerio
… tPOD approach was evaluated using the prohormone androstenedione. In the chronic Fish Sexual Development Test (FSDT; OECD TG 234), androstenedione induced complete masculinization at the lowest test concentration, preventing the determination of the No Observed Effect Concentration (NOEC). To …
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Clinical and endocrine responses to ovarian hyperstimulation in flare and and luteal gonadotropin-releasing hormone agonist (GnRHa) protocols
… Luteinizing Hormone (LH), progesterone (P), androstenedione (D₄) and AMH levels were measured from aliquots of frozen serum samples. Hormone responses were evaluated by Area Under the Curve (AUC). Data were analyzed using the t-test and statistical significance was considered present at …
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Towards a More Accurate Diagnosis of Polycystic Ovary Syndrome (Pcos): The Role of Anti-Müllerian Hormone and Ultrasound in Identifying Polycystic Ovary Morphology in Pcos Patients
… con i livelli di LH, LH/FSH, testosterone, androstenedione, indice degli androgeni liberi (FAI), numero medio dei follicoli e volume ovarico medio. Le curve di AMH stratificate per età che abbiamo sviluppato offrono un metodo più preciso e standardizzato per interpretare i livelli di AMH …
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