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Oestradiol

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https://www.readbyqxmd.com/read/28808344/hypothalamic-effects-of-progesterone-on-regulation-of-the-pulsatile-and-surge-release-of-luteinising-hormone-in-female-rats
#1
Wen He, Xiaofeng Li, Daniel Adekunbi, Yali Liu, Hui Long, Li Wang, Qifeng Lyu, Yanping Kuang, Kevin T O'Byrne
Progesterone can block the oestradiol-induced GnRH/LH surge and inhibit LH pulse frequency. Recent studies reported that progesterone prevented premature LH surges during ovarian hyperstimulation in women. As the most potent stimulator of GnRH/LH release, kisspeptin is believed to mediate the positive and negative feedback effects of oestradiol in the hypothalamic anteroventral periventricular (AVPV) and arcuate (ARC) nuclei, while the region-specific role of progesterone receptors in these nuclei remains unknown...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28791047/central-precocious-puberty-and-response-to-gnrha-therapy-in-children-with-cerebral-palsy-and-moderate-to-severe-motor-impairment-data-from-a-longitudinal-case-control-multicentre-italian-study
#2
Patrizia Bruzzi, Maria Francesca Messina, Alessandra Bartoli, Barbara Predieri, Laura Lucaccioni, Simona Filomena Madeo, Alberto Verrotti, Filippo De Luca, Lorenzo Iughetti
BACKGROUND: Children affected by neurodevelopmental disability could experience early pubertal changes at least 20 times more than the general population. Limited data about central precocious puberty (CPP) among children affected by cerebral palsy (CP) are available. METHODS: This is a longitudinal, observational, retrospective, case-control study involving 22 children affected by CPP and CP (group A), 22 paired with CP but without CPP (group B), and 22 children with CPP without CP...
2017: International Journal of Endocrinology
https://www.readbyqxmd.com/read/28776117/gnrh-antagonist-administered-twice-the-day-before-hcg-trigger-combined-with-a-step-down-protocol-may-prevent-ohss-in-ivf-icsi-antagonist-cycles-at-risk-for-ohss-without-affecting-the-reproductive-outcomes-a-prospective-randomized-control-trial
#3
Yannis Prapas, Konstantinos Ravanos, Stamatios Petousis, Yannis Panagiotidis, Achilleas Papatheodorou, Chrysoula Margioula-Siarkou, Assunta Iuliano, Giuseppe Gullo, Nikos Prapas
PURPOSE: The purpose this study is to investigate whether a double antagonist dose (0.25 mg/12 h) administered the day before hCG trigger is effective in preventing ovarian hyperstimulation syndrome (OHSS) in GnRH antagonist IVF/intracytoplasmic sperm injection (ICSI) cycles at risk for OHSS. METHODS: This is a prospective randomized control study, conducted from November 2012 to January 2016. A total of 194 patients undergoing a IVF/ICSI GnRH antagonist cycle that were at risk of OHSS and chose to proceed with embryo transfer and avoid cycle cancellation or embryo cryopreservation were allocated into two groups...
August 3, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28775186/are-thyroid-nodules-associated-with-sex-related-hormones-a-cross-sectional-spect-china-study
#4
Yi Chen, Yingchao Chen, Ningjian Wang, Chi Chen, Xiaomin Nie, Qin Li, Bing Han, Fangzhen Xia, Hualing Zhai, Boren Jiang, Zhoujun Shen, Yingli Lu
OBJECTIVE: Little is known about the association between thyroid nodules (TNs) and endogenous sex hormones. We aimed to investigate the relationship between TNs and sex-related hormones among men in China. SETTING: The data were obtained from a cross-sectional study Survey on Prevalence in East China for Metabolic Diseases and Risk Factors (SPECT-China study, 2014-2015) based on the population. PARTICIPANTS: In total, 4024 men over 18 years of age who were not using hormone replacement therapy and who underwent complete assays of the serum total testosterone (T), oestradiol (E2), follicle-stimulating hormone (FSH), luteinising hormone (LH) and sex hormone-binding globulin (SHBG) levels as well as thyroid ultrasonography (US) enrolled in this study...
August 3, 2017: BMJ Open
https://www.readbyqxmd.com/read/28768143/intrauterine-exposure-to-17%C3%AE-oestradiol-e2-impairs-postnatal-development-in-both-female-and-male-prostate-in-gerbil
#5
Bruno D A Sanches, Juliana M Santos, Bruno C Zani, Manoel F Biancardi, Fernanda C A Santos, Rejane M Góes, Patricia S L Vilamaior, Sebastião R Taboga
We employed histological techniques to assess the effects of intrauterine exposure to different dosages of E2 on male and female Mongolian gerbils on the postnatal development of the prostate. E2 promotes alterations this gland branches in the female, but not in males, even at low dosage, at higher dosages, acini of altered aspect are verified in the male and female prostate, as well as a decrease in branching number, reduced cell proliferation and staining for FGF10, simultaneously to the increased labelling for TGFβ1, which may account for alterations on branching of the prostate...
July 30, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/28758506/exposure-to-modern-widespread-environmental-endocrine-disrupting-chemicals-and-their-effect-on-the-reproductive-potential-of-women-an-overview-of-current-epidemiological-evidence
#6
Anetta Karwacka, Dorota Zamkowska, Michał Radwan, Joanna Jurewicz
Growing evidence indicates that exposure to widespread, environmental contaminants called endocrine disruptors (EDCs) negatively affects animal and human reproductive health and has been linked to several diseases including infertility. This review aims to evaluate the impact of environmental exposure to endocrine disrupting chemicals [phthalates, parabens, triclosan, bisphenol A (BPA), organochlorine (PCBs) and perfluorinated (PFCs) compounds] on the reproductive potential among women, by reviewing most recently published literature...
July 31, 2017: Human Fertility: Journal of the British Fertility Society
https://www.readbyqxmd.com/read/28757672/aggressive-behaviours-track-transitions-in-seasonal-phenotypes-of-female-siberian-hamsters
#7
Nikki M Rendon, Andrea C Amez, Melissa R Proffitt, Elizabeth R Bauserman, Gregory E Demas
Seasonally breeding animals exhibit profound physiological and behavioural responses to changes in ambient day length (photoperiod), including changes in reproductive function and territorial aggression.Species where aggression persists when gonads are regressed and circulating levels of gonadal hormones are low, such as Siberian hamsters (Phodopus sungorus) and song sparrows (Melospiza melodia), challenge the well-established framework that gonadal hormones are important mediators of aggression.A solution to this apparent paradox is that a season-specific increase in sensitivity to hormones in brain areas associated with aggression offsets low levels of gonadal hormones during periods of reproductive quiescence...
May 2017: Functional Ecology
https://www.readbyqxmd.com/read/28753895/oestradiol-releasing-biodegradable-mesh-stimulates-collagen-production-and-angiogenesis-an-approach-to-improving-biomaterial-integration-in-pelvic-floor-repair
#8
Naşide Mangır, Christopher J Hillary, Christopher R Chapple, Sheila MacNeil
BACKGROUND: Polypropylene meshes cause severe complications in some patients. Materials that are biomechanically compatible and can better integrate into host tissues are urgently needed. OBJECTIVE: To design an oestradiol-releasing electrospun poly-l-lactic acid (PLA) mesh and evaluate its ability to stimulate new extracellular matrix and new blood vessel formation. DESIGN, SETTING, AND PARTICIPANTS: Human adipose derived mesenchymal cells (ADMSC) were isolated from fat...
June 3, 2017: European Urology Focus
https://www.readbyqxmd.com/read/28743351/chronic-stress-effects-and-their-reversibility-on-the-fallopian-tubes-and-uterus-in-rats
#9
S Divyashree, H N Yajurvedi
The durational effects of chronic stress on the Fallopian tubes and uterus were studied by exposing rats to stressors in the form of restraint (1h) and forced swimming (15min) daily for 4, 8 or 12 weeks. One group of stressed rats from each time period was then maintained without exposure to stressors for a further 4 weeks to assess their ability to recover from stress. All time periods of stress exposure resulted in decreased weight of the body and Fallopian tubes; however, the relative weight of the uterus and serum concentrations of oestradiol and insulin increased significantly...
July 26, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28741838/intrauterine-exposure-to-oestradiol-promotes-sex-specific-differential-effects-on-the-prostatic-development-of-neonate-gerbils
#10
Bruno D A Sanches, Juliana S Maldarine, Manoel F Biancardi, Fernanda C A Santos, Maria E Pinto-Fochi, Julia Q Antoniassi, Rejane M Goés, Patrícia S L Vilamaior, Sebastião R Taboga
The effects of intrauterine exposure to 17β-oestradiol (E2) are well studied for the male prostate and there are accumulating evidences that the exposure to high dosages leads to a hypomorphic development. However there is a lack of information about the effects of intrauterine exposure to E2 in the prostate of rodent females, and such research becomes relevant in view of the presence of functional prostate in a proportion of women, and the morphophysiological similarities between the prostate of female rodents and the prostate of women...
July 25, 2017: Cell Biology International
https://www.readbyqxmd.com/read/28733189/systematic-review-of-serum-steroid-reference-intervals-developed-using-mass-spectrometry
#11
REVIEW
Nevada Tavita, Ronda F Greaves
The aim of this study was to perform a systematic review of the published literature to determine the available serum/plasma steroid reference intervals generated by mass spectrometry (MS) methods across all age groups in healthy subjects and to suggest recommendations to achieve common MS based reference intervals for serum steroids. MEDLINE, EMBASE and PubMed databases were used to conduct a comprehensive search for English language, MS-based reference interval studies for serum/plasma steroids. Selection of steroids to include was based on those listed in the Royal College of Pathologists of Australasia Quality Assurance Programs, Chemical Pathology, Endocrine Program...
July 19, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/28721436/age-at-natural-menopause-and-risk-of-type-2-diabetes-a-prospective-cohort-study
#12
Taulant Muka, Eralda Asllanaj, Naim Avazverdi, Loes Jaspers, Najada Stringa, Jelena Milic, Symen Ligthart, M Arfan Ikram, Joop S E Laven, Maryam Kavousi, Abbas Dehghan, Oscar H Franco
AIMS/HYPOTHESIS: In this study, we aimed to examine the association between age at natural menopause and risk of type 2 diabetes, and to assess whether this association is independent of potential mediators. METHODS: We included 3639 postmenopausal women from the prospective, population-based Rotterdam Study. Age at natural menopause was self-reported retrospectively and was treated as a continuous variable and in categories (premature, <40 years; early, 40-44 years; normal, 45-55 years; and late menopause, >55 years [reference])...
July 18, 2017: Diabetologia
https://www.readbyqxmd.com/read/28714586/activation-of-autophagy-is-involved-in-the-protective-effect-of-17%C3%AE-oestradiol-on-endotoxaemia-induced-multiple-organ-dysfunction-in-ovariectomized-rats
#13
Ming-Tzeung Chung, Yen-Mei Lee, Hsin-Hsueh Shen, Pao-Yun Cheng, Yu-Chen Huang, Yu-Ju Lin, Yu-Yang Huang, Kwok-Keung Lam
Oestrogens have been reported to attenuate acute inflammation in sepsis. In this study, the effects of long-term oestrogen replacement with 17β-oestradiol (E2 ) on endotoxaemia-induced circulatory dysfunction and multiple organ dysfunction syndrome were evaluated in ovariectomized (Ovx) rats. E2 (50 μg/kg, s.c., 3 times/week) was administered for 8 weeks, followed by the induction of endotoxaemia by intravenous infusion of lipopolysaccharides (LPS; 30 mg/kg/4 hrs). Oestrogen deficiency induced by ovariectomy for 9 weeks augmented the LPS-induced damage, including endotoxic shock, myocardial contractile dysfunction, renal dysfunction and rhabdomyolysis...
July 17, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28706210/regulation-of-aromatase-expression-in-the-anterior-amygdala-of-the-developing-mouse-brain-depends-on-er%C3%AE-and-sex-chromosome-complement
#14
Carla Daniela Cisternas, Lucas Ezequiel Cabrera Zapata, María Angeles Arevalo, Luis Miguel Garcia-Segura, María Julia Cambiasso
During development sex differences in aromatase expression in limbic regions of mouse brain depend on sex chromosome factors. Genes on the sex chromosomes may affect the hormonal regulation of aromatase expression and this study was undertaken to explore that possibility. Male E15 anterior amygdala neuronal cultures expressed higher levels of aromatase (mRNA and protein) than female cultures. Furthermore, treatment with oestradiol (E2) or dihydrotestosterone (DHT) increased Cyp19a1 expression and aromatase protein levels only in female neuronal cultures...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28699698/reduced-dosing-and-liability-in-methadone-maintenance-treatment-by-targeting-oestrogen-signal-for-morphine-addiction
#15
Yao-Chang Chiang, Ruey-Yun Wang, Chieh-Liang Huang, Shue-Hwa Chen, Wen-Jing Ho, Hsien-Yuan Lane, Ing-Kang Ho, Hwei-Ting Yang, Wen-Lung Ma
Methadone maintenance treatment (MMT) is the major tapering therapy for morphine addictive patients. There have gender differences reported in response to MMT. This study discovered that the estrogen-response element single nucleotide polymorphism (ERE-SNP; rs16974799, C/T) of cytochrome 2B6 gene (cyp2b6; methadone catabolic enzyme) responded differently to MMT dosing. Oestradiol was associated with high MMT dosing, high enantiomer (R- or S-) of 2-ethylidene-1,5-dimethyl-3,3-dipheny-pyrrolidine (EDDP; methadone metabolite) to methadone ratio and increased drug-seeking behaviour, implicating oestradiol-CYP-EDDP/methadone axis decreasing MMT efficacy...
July 12, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28699305/enhancement-of-the-lh-surge-by-male-olfactory-signals-is-associated-with-avpv-kiss1-cell-activation-in-female-rats
#16
Youki Watanabe, Kana Ikegami, Ren Ishigaki, Nahoko Ieda, Yoshihisa Uenoyama, Kei-Ichiro Maeda, Hiroko Tsukamura, Naoko Inoue
Olfactory stimuli play an important role in regulating reproductive functions in mammals. The present study investigated the effect of olfactory signals derived from male rats on kisspeptin neuronal activity and luteinizing hormone (LH) secretion in female rats. Wistar-Imamichi strain female rats were ovariectomised (OVX) and implanted with preovulatory levels of oestradiol-17β (E2). OVX+E2 rats were sacrificed 1 hour after exposure to either: clean bedding, female-soiled bedding or male-soiled bedding. Dual staining for Kiss1 mRNA in situ hybridization and c-Fos immunohistochemistry revealed that the numbers of Kiss1-expressing cells and c-Fos-immunopositive Kiss1-expressing cells in the anteroventral periventricular nucleus (AVPV) were significantly higher in OVX+E2 rats exposed to male-soiled bedding than those of the other groups...
July 12, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28687450/role-of-androgens-in-the-ovary
#17
REVIEW
K A Walters, D J Handelsman
It has been well established for decades that androgens, namely testosterone (T) plays an important role in female reproductive physiology as the precursor for oestradiol (E2). However, in the last decade a direct role for androgens, acting via the androgen receptor (AR), in female reproductive function has been confirmed. Deciphering the specific roles of androgens in ovarian function has been hindered as complete androgen resistant females cannot be generated by natural breeding. In addition, androgens can be converted into estrogens which has caused confusion when interpreting findings from pharmacological studies, as observed effects could have been mediated via the AR or estrogen receptor...
July 4, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28684292/the-polymorphic-insertion-of-the-luteinizing-hormone-receptor-inslq-show-a-negative-association-to-lhr-gene-expression-and-to-the-follicular-fluid-hormonal-profile-in-human-small-antral-follicles
#18
T Borgbo, J Chrudimska, M Macek, J V Jeppesen, J A Bøtkjær, S G Kristensen, K T Macklon, E Ernst, L L Hansen, C Yding Andersen
The luteinizing hormone receptor (LHCGR) has a little studied polymorphic 6 bp insertion (rs4539842/insLQ). This study has evaluated the insLQ polymorphism in relation to potential associations with hormonal characteristics of human small antral follicles (hSAFs). In total, 310 hSAFs were collected from 86 women undergoing fertility preservation. Analysis included hormonal profile of 297 follicular fluid (FF) samples and 148 corresponding granulosa cells samples were evaluated by qPCR for selected genes. Significantly reduced and non-detectable mRNA levels of anti-Müllerian hormone receptor II (AMHR2) and LHCGR, respectively, were observed for insLQ/insLQ compared to -/insLQ and the -/- genotypes...
July 3, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28680060/novel-oestrogen-receptor-%C3%AE-selective-ligand-reduces-obesity-and-depressive-like-behaviour-in-ovariectomized-mice
#19
Daimei Sasayama, Nobuhiro Sugiyama, Shigeru Yonekubo, Akiko Pawlak, Hiroyasu Murasawa, Mie Nakamura, Morimichi Hayashi, Takashi Ogawa, Makoto Moro, Shinsuke Washizuka, Naoji Amano, Kazuhiro Hongo, Hideki Ohnota
Hormonal changes due to menopause can cause various health problems including weight gain and depressive symptoms. Multiple lines of evidence indicate that oestrogen receptors (ERs) play a major role in postmenopausal obesity and depression. However, little is known regarding the ER subtype-specific effects on obesity and depressive symptoms. To delineate potential effects of ERβ activation in postmenopausal women, we investigated the effects of a novel oestrogen receptor β-selective ligand (C-1) in ovariectomized mice...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28661216/luteal-phase-protocol-in-poor-ovarian-response-a-comparative-study-with-an-antagonist-protocol
#20
Yan Wu, Fu-Chun Zhao, Yong Sun, Pei-Shu Liu
Objective This retrospective study compared the effect of the luteal phase ovarian stimulation protocol (LP group) with the gonadotrophin-releasing hormone (GnRH) antagonist protocol (AN group) in women with poor ovarian responses. Methods Ovarian stimulation was initiated with 225 IU of human gonadotrophin (hMG) daily. When the dominant follicle diameter exceeded 13 mm, 0.25 mg of a GnRH antagonist was used daily until human chorionic gonadotrophin (HCG) administration in the AN group. A GnRH antagonist was not used in the LP group...
January 1, 2017: Journal of International Medical Research
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