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https://www.readbyqxmd.com/read/28222406/leydig-cell-clustering-and-reinke-crystal-distribution-in-relation-to-hormonal-function-in-adult-patients-with-testicular-dysgenesis-syndrome-tds-including-cryptorchidism
#1
Rikke R Soerensen, Trine H Johannsen, Niels E Skakkebaek, Ewa Rajpert-De Meyts
OBJECTIVE: Testicular dysgenesis syndrome (TDS) comprises testicular germ cell cancer, cryptorchidism and some cases of male infertility and hypospadias, which can be linked to impairment of intrauterine gonadal development. Among histological signs of TDS, large Leydig cell (LC) clusters (micronodules) are frequently present. This study aimed to investigate possible associations of LC micronodules with the presence of Reinke crystals and hormonal function of LCs, the latter primarily reflected by serum concentrations of luteinising hormone (LH) and testosterone, in patients with TDS...
October 2016: Hormones: International Journal of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28216160/effect-of-cortisol-on-gonadotropin-inhibitory-hormone-gnih-in-the-cinnamon-clownfish-amphiprion-melanopus
#2
Young Jae Choi, Hamid R Habibi, Gyung-Suk Kil, Min-Min Jung, Cheol Young Choi
Hypothalamic peptides, gonadotropin-releasing hormone (GnRH) and gonadotropin inhibitory hormone (GnIH), play pivotal roles in the control of reproduction and gonadal maturation in fish. In the present study we tested the possibility that stress-mediated reproductive dysfunction in teleost may involve changes in GnRH and GnIH activity. We studied expression of brain GnIH, GnIH-R, seabream GnRH (sbGnRH), as well as circulating levels of follicle stimulating hormone (FSH), luteinizing hormone (LH) and cortisol in the cinnamon clownfish, Amphiprion melanopus...
February 16, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28196547/validation-of-a-mathematical-model-of-the-bovine-estrous-cycle-for-cows-with-different-estrous-cycle-characteristics
#3
H M T Boer, S T Butler, C Stötzel, M F W Te Pas, R F Veerkamp, H Woelders
A recently developed mechanistic mathematical model of the bovine estrous cycle was parameterized to fit empirical data sets collected during one estrous cycle of 31 individual cows, with the main objective to further validate the model. The a priori criteria for validation were (1) the resulting model can simulate the measured data correctly (i.e. goodness of fit), and (2) this is achieved without needing extreme, probably non-physiological parameter values. We used a least squares optimization procedure to identify parameter configurations for the mathematical model to fit the empirical in vivo measurements of follicle and corpus luteum sizes, and the plasma concentrations of progesterone, estradiol, FSH and LH for each cow...
February 15, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28190662/prospective-ultrasonographic-and-endocrine-predictors-of-spermatogenic-onset-in-ram-lambs
#4
Pawel M Bartlewski, Jennifer L Giffin, Olutobi A Oluwole, Ann C Hahnel
The objective of this study was to examine testicular ultrasonographic characteristics and endocrine profiles in prepubescent ram lambs for correlations with the age at first detection of elongated spermatids (ESt age). Bi-weekly ultrasound examinations and weekly testicular biopsies began at 10 weeks of age or at the time that testicular volume reached 15cm(3), and continued until 1-2 weeks after Est's were first detected by histological examination of testicular biopsies in twenty-two spring-born Rideau Arcott×Polled Dorset lambs...
February 6, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28189123/impact-of-various-progestins-with-or-without-transdermal-testosterone-on-gonadotropin-levels-for-non-invasive-hormonal-male-contraception-a-randomized-clinical-trial
#5
M Zitzmann, J Rohayem, J Raidt, S Kliesch, N Kumar, R Sitruk-Ware, E Nieschlag
Although several progestins have been tested for hormonal male contraception, the effects of dosage and nature of various progestins on gonadotropin suppression combined with and without additional testosterone has not been performed in a comparative trial. The aim of this study was to evaluate the differential impact of four oral or transdermal progestins on the suppression of gonadotropins in healthy men: oral: cyproterone acetate (CPA), levonorgestrel (LNG), norethisterone acetate (NETA), and transdermal: Nestorone(®) (NES), all in combination with transdermal testosterone (T)...
February 11, 2017: Andrology
https://www.readbyqxmd.com/read/28187771/the-effect-of-estradiol-on-granulosa-cell-responses-to-fsh-in-women-with-polycystic-ovary-syndrome
#6
Michael V Homer, Marcus A Rosencrantz, Rana F Shayya, R Jeffrey Chang
BACKGROUND: The influence of estradiol (E2) on granulosa cell (GC) function has not been tested clinically in women with polycystic ovary syndrome (PCOS). The objective of this study is to determine if E2 influences GC responses to FSH in women with PCOS. METHODS: This is a two phase, single cohort study conducted over a 2-year period at a single academic center. Nine women with PCOS according to NIH criteria. In Phase 1, FSH stimulation of GC responses as measured by E2 and Inhibin B (Inh B) were assessed before and at 5 and 6 weeks after GnRH agonist administration...
February 10, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/28186349/effect-of-gonadotropin-inhibitory-hormone-gnih-on-luteinizing-hormone-secretion-in-humans
#7
J T George, M Hendrikse, J D Veldhuis, I J Clarke, R A Anderson, R P Millar
: Gonadotropin inhibitory hormone (GnIH, human homologue of RFRP-3) suppresses gonadotropin secretion in animal models, but its effects have not been studied in the human. OBJECTIVE: We tested the hypotheses that exogenous GnIH inhibits LH secretion a) in postmenopausal women, and b) in men concurrently administered exogenous kisspeptin. DESIGN: Following in vitro and in vivo pre-clinical studies to functionally characterize the GnIH peptide, a dose-finding study (human GnIH 1...
February 10, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28181328/protein-and-mrna-expression-of-follicle-stimulating-hormone-receptor-and-luteinizing-hormone-receptor-during-the-oestrus-in-the-yak-bos-grunniens
#8
S-D Huo, S-E Chen, R-J Long, J-T Yang, J-X Lu, R-X Zang, T-J Zhang, A Abudureyimu, J-L Liu, G-H Zhang, Y-Q Zhao, Z-R Ma
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) have a central role in follicle growth, maturation and oestrus, but no clear pathway in the seasonal oestrus of yak (Bos grunniens) has been found. To better understand the role of FSH and LH in seasonal oestrus in the yak, six yaks were slaughtered while in oestrus, and the pineal gland, hypothalamus, pituitary gland, and gonads were collected. Using real-time PCR and immunohistochemical assays, we determined the mRNA and protein expression of the FSH and LH receptors (FSHR and LHR) in these organs...
February 8, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28166985/in%C3%A2-vitro-growth-and-maturation-of-isolated-caprine-preantral-follicles-influence-of-insulin-and-fsh-concentration-culture-dish-coculture-and-oocyte-size-on-meiotic-resumption
#9
G M Silva, I R Brito, A D Sales, F L N Aguiar, A B G Duarte, V R Araújo, L A Vieira, D M Magalhães-Padilha, L F Lima, B G Alves, L B R Silveira, E G Lo Turco, A P Rodrigues, C C Campello, M B Wheeler, J R Figueiredo
The aims of this study were: (1) to evaluate the effect of different insulin concentrations, alone or in combination with either a fixed FSH concentration or increasing FSH concentrations on the in vitro culture of isolated caprine preantral follicles and (2) to analyze the efficiency of two IVM media and maturation culture systems (with or without coculture with in vivo grown oocytes) on the meiosis resumption. Secondary follicles were cultured for 18 days in a basic medium supplemented with low- or high-insulin concentration alone or with a fixed FSH concentration or with increasing FSH concentrations...
March 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28164072/leptin-and-adiponectin-levels-in-girls-with-central-precocious-puberty-before-and-during-gnrh-agonist-treatment
#10
Jae Won Yoo, Chun Woo Song, Han Hyuk Lim
PURPOSE: The effects of gonadotropin-releasing hormone agonist (GnRHa) treatment on the energy metabolism in girls with central precocious puberty (CPP) are controversial. We focused the changes and related factors of serum levels of leptin and adiponectin in girls with CPP before and during GnRHa treatment. METHODS: Thirty girls with idiopathic CPP were enrolled in the study. Their auxological data and fasting blood were collected at the baseline and after six months of GnRHa treatment...
December 2016: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/28144163/association-between-telomere-length-and-cyp19-ttta-repetition-polymorphism-in-healthy-and-breast-cancer-diagnosed-women
#11
Blanca Murillo-Ortiz, Sandra Martínez-Garza, David Suárez García, Rosa Del Carmen Castillo Valenzuela, Juan Francisco García Regalado, Gerardo Cano Velázquez
INTRODUCTION: Several studies have reported an increase in breast cancer (BC) risk when patients are carriers of the CYP19 TTA polymorphism with ≥10 repeats; moreover, it has been reported that telomere length is associated with a higher susceptibility of developing cancer. OBJECTIVE: The objective of this study was to understand the relationship between CYP19 TTTA repetition polymorphism and telomere length and its effects on serum estradiol, estrone and follicle-stimulating hormone (FSH)...
2017: Breast Cancer: Targets and Therapy
https://www.readbyqxmd.com/read/28141919/effect-of-corticosteroids-and-cyclophosphamide-on-sex-hormone-profiles-in-male-patients-with-systemic-lupus-erythematosus-and-systemic-sclerosis
#12
Laurent Arnaud, Annica Nordin, Hannes Lundholm, Elisabet Svenungsson, Erik Hellbacher, Johan Wikner, Agneta Zickert, Iva Gunnarsson
OBJECTIVE: Systemic Lupus Erythematosus (SLE) and Systemic Sclerosis (SSc) are predominantly female autoimmune diseases, therefore men are less well investigated. We analysed sex hormone levels in male patients with SLE and SSc comparatively to controls, in relation with use of corticosteroids and cyclophosphamide. METHODS: Sex hormone levels were measured from fasting blood samples in male patients with SLE (n=71), SSc (n=29) and compared to population-based age-matched male controls...
January 31, 2017: Arthritis & Rheumatology
https://www.readbyqxmd.com/read/28141661/association-of-follicle-stimulating-hormone-levels-and-risk-of-type-2-diabetes-in-older-postmenopausal-women
#13
Elizabeth R Bertone-Johnson, Jyrki K Virtanen, Leo Niskanen, Tarja Nurmi, Kimmo Ronkainen, Sari Voutilainen, Jaakko Mursu, Jussi Kauhanen, Tomi-Pekka Tuomainen
OBJECTIVE: Recent studies of perimenopausal women have observed associations of follicle-stimulating hormone (FSH) levels with markers of insulin resistance, independent of estradiol. Whether FSH is related to type 2 diabetes (T2D) in older women who have completed the menopause transition remains unknown. We assessed the association of FSH levels with diabetes and measures of insulin resistance among 588 postmenopausal Finnish women. METHODS: Study participants were aged 53 to 73 years and not using hormone therapy at baseline (1998-2001) when FSH was measured...
January 30, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28138749/the-relationship-between-postmenopausal-women-s-sclerostin-levels-and-their-bone-density-age-body-mass-index-hormonal-status-and-smoking-and-consumption-of-coffee-and-dairy-products
#14
Muberra Namlı Kalem, Ziya Kalem, Nilufer Akgun, Batuhan Bakırarar
PURPOSE: To investigate the relationship between postmenopausal women's sclerostin levels and bone density and the factors that may affect this relationship. MATERIALS AND METHODS: 135 postmenopausal patients' ages, BMIs, hormonal statuses, BMD values, and smoking, and consumption of coffee and dairy products were compared with their sclerostin levels. RESULTS: No statistical relationship was found between sclerostin level and age in the group with osteoporosis (p = 0...
January 31, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28137754/efficacy-and-safety-of-follitropin-alfa-lutropin-alfa-in-art-a-randomized-controlled-trial-in-poor-ovarian-responders
#15
P Humaidan, W Chin, D Rogoff, T D'Hooghe, S Longobardi, J Hubbard, J Schertz
STUDY QUESTION: How does the efficacy and safety of a fixed-ratio combination of recombinant human FSH plus recombinant human LH (follitropin alfa plus lutropin alfa; r-hFSH/r-hLH) compare with that of r-hFSH monotherapy for controlled ovarian stimulation (COS) in patients with poor ovarian response (POR)? SUMMARY ANSWER: The primary and secondary efficacy endpoints were comparable between treatment groups and the safety profile of both treatment regimens was favourable...
January 30, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28125168/prednisone-treatment-in-infertile-patients-with-oligozoospermia-and-accessory-gland-inflammatory-alterations
#16
D Milardi, G Luca, G Grande, M Ghezzi, N Caretta, G Brusco, G De Filpo, R Marana, A Pontecorvi, R Calafiore, C Foresta, A Garolla
The association between inflammation of the male reproductive system and oligozoospermia has been frequently reported in the clinical work-up of male infertility. To improve sperm parameters in infertile patients with genital inflammation, many phytochemical and nutraceutical drugs are currently being used. However, their use is still empirical and no conclusive data have been provided about their efficacy. The treatment with steroid anti-inflammatory drugs might be useful in reducing inflammation and improving sperm parameters, thus increasing the fertility outcome...
January 26, 2017: Andrology
https://www.readbyqxmd.com/read/28124728/jumping-exercise-preserves-bone-mineral-density-and-mechanical-properties-in-osteopenic-ovariectomized-rats-even-following-established-osteopenia
#17
R Okubo, L S Sanada, V A Castania, M J Q Louzada, F J A de Paula, N Maffulli, A C Shimano
: The effects of jump training on bone structure before and after ovariectomy-induced osteopenia in rats were investigated. Jumping exercise induced favorable changes in bone mineral density, bone mechanical properties, and bone formation/resorption markers. This exercise is effective to prevent bone loss after ovariectomy even when osteopenia is already established. INTRODUCTION: The present study investigated the effects of jump training on bone structure before and after ovariectomy-induced osteopenia in 80 10-week-old Wistar rats...
January 26, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28107821/effects-of-a-single-20%C3%A2-mg-dose-of-letrozole-on-ovarian-function-post-dominant-follicle-selection-an-exploratory-randomized-controlled-trial
#18
H C M Allaway, D R Chizen, G P Adams, R A Pierson
BACKGROUND: Our objective was to explore the impact of a single dose of an aromatase inhibitor (letrozole) administered at defined times of the follicular phase or immediately after ovulation on dominant follicle development, luteogenesis and new follicle wave emergence. METHODS: A prospective pilot study using a randomized complete block, controlled, open label design was conducted at an academic clinical research center. Forty-five healthy, female volunteers (25...
January 21, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28093458/single-cell-gene-expression-analysis-reveals-diversity-among-human-spermatogonia
#19
N Neuhaus, J Yoon, N Terwort, S Kliesch, J Seggewiss, A Huge, R Voss, S Schlatt, R V Grindberg, H R Schöler
STUDY QUESTION: Is the molecular profile of human spermatogonia homogeneous or heterogeneous when analysed at the single-cell level? SUMMARY ANSWER: Heterogeneous expression profiles may be a key characteristic of human spermatogonia, supporting the existence of a heterogeneous stem cell population. WHAT IS KNOWN ALREADY: Despite the fact that many studies have sought to identify specific markers for human spermatogonia, the molecular fingerprint of these cells remains hitherto unknown...
January 15, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28081480/does-the-addition-of-salpingectomy-or-fimbriectomy-to-hysterectomy-in-premenopausal-patients-compromise-ovarian-reserve-a-prospective-study
#20
Y Naaman, Y Hazan, M Gillor, G Marciano, R Bardenstein, Z Shoham, A Ben-Arie
OBJECTIVE: To evaluate changes in ovarian reserve in patients following hysterectomy, with or without bilateral salpingectomy or fimbriectomy. STUDY DESIGN: Open-label, prospective cohort trial of patients undergoing hysterectomy for benign uterine indications. Levels of follicle-stimulating hormone (FSH), anti-Müllerian hormone (AMH), and ultrasonic measures of peak systolic flow velocity/diastolic velocity (S/D) ratio and resistance index (RI) in the ovarian artery were taken from patients before and 6 weeks after hysterectomy, hysterectomy+salpingectomy or hysterectomy+fimbriectomy...
December 27, 2016: European Journal of Obstetrics, Gynecology, and Reproductive Biology
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