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https://www.readbyqxmd.com/read/29229849/obligatory-role-of-hypothalamic-neuroestradiol-during-the-estrogen-induced-lh-surge-in-female-ovariectomized-rhesus-monkeys
#1
Brian P Kenealy, Kim L Keen, James P Garcia, Lucille K Kohlenberg, Ei Terasawa
Negative and positive feedback effects of ovarian 17β-estradiol (E2) regulating release of gonadotropin releasing hormone (GnRH) and luteinizing hormone (LH) are pivotal events in female reproductive function. While ovarian feedback on hypothalamo-pituitary function is a well-established concept, the present study shows that neuroestradiol, locally synthesized in the hypothalamus, is a part of estrogen's positive feedback loop. In experiment 1, E2 benzoate-induced LH surges in ovariectomized female monkeys were severely attenuated by systemic administration of the aromatase inhibitor, letrozole...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29223284/daily-rhythms-count-for-female-fertility
#2
REVIEW
Valérie Simonneaux, Thibault Bahougne, Eleni Angelopoulou
Female ovulation depends on a surge in circulating luteinizing hormone (LH) which occurs at the end of the resting period and requests high circulating estradiol. This fine tuning involves both an estradiol feedback as an indicator of oocyte maturation, and the master circadian clock of the suprachiasmatic nuclei as an indicator of the time of the day. This review describes the mechanisms through which daily time cues are conveyed to reproductive hypothalamic neurons to time the pre-ovulatory surge. In female rodents, neurotransmitters released by the suprachiasmatic nuclei activate the stimulatory kisspeptin neurons and reduce the inhibitory RFRP neurons precisely at the end of the afternoon of proestrus to allow a full surge in LH secretion...
October 2017: Best Practice & Research. Clinical Endocrinology & Metabolism
https://www.readbyqxmd.com/read/29216287/transcriptomic-profiles-in-peripheral-blood-between-women-with-unexplained-recurrent-implantation-failure-and-recurrent-miscarriage-and-the-correlation-with-endometrium-a-pilot-study
#3
Jin Huang, Nana Jin, Hao Qin, Xiao Shi, Yingyu Liu, Wingching Cheung, Chi Chiu Wang, Ting Fung Chan, Tin Chiu Li
AIM: To study the transcriptome profiles in the blood of recurrent implantation failure (RIF), recurrent miscarriage (RM) and fertile women during the window of implantation, and further analysis the correlation of transcriptome profiles between blood and endometrium. METHODS: This is an observational prospective study. In total 9 subjects were recruited, 3 RIF, 3 RM, and 3 controls. Paired samples (endometrium and peripheral blood) from the same subjects were precisely timed on the 7th days after luteal hormone surge (LH+7)...
2017: PloS One
https://www.readbyqxmd.com/read/29203140/coordination-or-coincidence-the-relationship-between-prolactin-and-gonadotropin-secretion
#4
David R Grattan
A recent paper demonstrates that kisspeptin can stimulate the secretion of both prolactin and luteinizing hormone (LH). This provides novel insight into mechanisms that could account for previous observations of concordant patterns of secretion of the two hormones, such as pulsatile secretion with simultaneous pulses, as well as the preovulatory surges of both prolactin and LH.
December 1, 2017: Trends in Endocrinology and Metabolism: TEM
https://www.readbyqxmd.com/read/29177238/comparing-the-effect-of-gonadotropin-releasing-hormone-agonist-and-human-chorionic-gonadotropin-on-final-oocytes-for-ovulation-triggering-among-infertile-women-undergoing-intrauterine-insemination-an-rct
#5
Robabeh Taheripanah, Marzieh Zamaniyan, Atefeh Moridi, Anahita Taheripanah, Narges Malih
Background: The purpose of triggering in ovulation induction is to induce the final maturation of oocytes and their release from the ovary for fertilization. Objective: The aim of the present study was to compare the effectiveness of gonadotropin-releasing hormone (GnRH) agonist and human chorionic gonadotropin (HCG) on the final maturation of oocytes and pregnancy rates in intrauterine insemination (IUI) cycles. Materials and Methods: In this randomized clinical trial, 110 infertile women who were selected for IUI entered the study...
June 2017: International Journal of Reproductive Biomedicine (Yazd, Iran)
https://www.readbyqxmd.com/read/29171353/the-neuro-control-of-the-ovarain-cycle-a-hypothesis
#6
Bruno Lunenfeld, Klaus Bühler
Since more than 100 years, it is known that pituitary function depends upon the function of higher centers in the brain. It was already assumed at this time that pituitary extracts could influence the gonads and postulated that their use could have practical applications. In 1926, the 'gonadal principle' was discovered revealing the regulation of ovarian function by the pituitary. The two pituitary hormones were called 'Prolan A' and 'Prolan B' which are responsible for ovarian function especially secretion of the hormones: 'lutein' and 'foliculin'...
November 24, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29162648/biological-age-of-the-endometrium-using-dna-methylation
#7
Mia S Olesen, Anna Starnawska, Jonas Bybjerg-Grauholm, Alexandra P Bielfeld, Inge E Agerholm, Axel Forman, Michael T Overgaard, Mette Nyegaard
Age has a detrimental effect on reproduction and as an increasing number of women postpone motherhood, it is imperative to assess biological age in terms of fertility prognosis and optimizing fertility treatment individually. Horvath's epigenetic clock is a mathematical algorithm that calculates the biological age of human cells, tissues or organs based on DNA methylation levels. The clock however, was previously shown to be highly inaccurate for the human endometrium, most likely because of the hormonal responsive nature of this tissue...
November 21, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29153058/induction-of-the-lh-surge-in-premenarchal-girls-confirms-early-maturation-of-the-hypothalamic-pituitary-ovarian-axis
#8
Polina Rovner, Julia Keltz, Amanda Allshouse, Barbara Isaac, Cheryl Hickmon, Jennifer Lesh, Justin Chosich, Nanette Santoro
PURPOSE: To determine whether premenarchal girls exhibit positive estradiol feedback similar to regularly cycling adult women when given exogenous estradiol. METHODS: This was a prospective clinical cohort study at 2 institutions. Nine girls and 6 women received a 7-day course of transdermal estradiol designed to produce physiologic, mid-cycle circulating estradiol levels. Participants collected daily morning urine for luteinizing hormone (LH), estradiol metabolites (E1c), and progesterone metabolites (Pdg), corrected for creatinine...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/29152085/the-effect-of-human-chorionic-gonadotrophin-contained-in-human-menopausal-gonadotropin-on-the-clinical-outcomes-during-progestin-primed-ovarian-stimulation
#9
Xiuxian Zhu, Jing Ye, Yonglun Fu, Ai Ai, Renfei Cai, Yun Wang, Qingging Hong, Tian Hui, Qifeng Lyu, Qiuju Chen, Yanping Kuang
Progestin-primed ovarian stimulation (PPOS) protocol has recently been demonstrated to be an novel regimen for preventing premature LH surges during controlled ovarian hyperstimulation (COH) in combination with frozen-thawed embryo transfer (FET). Our prospective controlled study was to explore the effect of human chorionic gonadotropin (hCG) contained in human menopausal gonadotropin (hMG) on the clinical outcomes in normalovulatory women undergoing COH with PPOS. A total of 180 patients were allocated into three groups according to the gonadotropin (Gn) used: group A (human menopausal gonadotropin, hMG-A), group B (hMG-B) or group C (follicle stimulating hormone, FSH)...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29134775/changes-in-sensitivity-to-the-effects-of-atrazine-on-the-luteinizing-hormone-surge-in-female-sprague-dawley-rats-after-repeated-daily-doses-correlation-with-liver-enzyme-expression
#10
Charles B Breckenridge, Chad D Foradori, Pragati Sawhney Coder, James W Simpkins, Robert L Sielken, Robert J Handa
BACKGROUND: Atrazine suppression of the LH surge slowly develops over time and peaks after 4 days; sensitivity to atrazine decreases after 8 or 14 days of dosing. Adaptation of the LH response was correlated with increased phase I and phase II liver enzyme activity/expression. METHODS: The effect of atrazine on the LH surge was evaluated in female Sprague-Dawley rats administered 100 mg/kg/day atrazine by gavage for 1, 2, 3, or 4 consecutive days or 6.5, 50, or 100 mg/kg/day atrazine for 4, 8, or 14 days...
November 14, 2017: Birth Defects Research
https://www.readbyqxmd.com/read/29126131/continuous-kisspeptin-restores-luteinizing-hormone-pulsatility-following-cessation-by-a-neurokinin-b-antagonist-in-female-sheep
#11
Iain J Clarke, Qun Li, Belinda A Henry, Robert P Millar
Pulsatile secretion of gonadotropin releasing hormone (GnRH) drives pulsatile secretion of luteinizing hormone (LH), with evidence that this depends upon kisspeptin (Kiss) input to GnRH neurons. Kiss administration causes acute GnRH/LH secretion and electrophysiological data suggest that Kiss neurons may act in a phasic manner to drive GnRH secretion, but there is not definitive evidence for this. The product of the Kiss1 gene is proteolytically cleaved to smaller products and the 10 amino-acid C-terminal product (Kiss-10) displays full bioactivity...
November 3, 2017: Endocrinology
https://www.readbyqxmd.com/read/29114074/glutamatergic-transmission-to-hypothalamic-kisspeptin-neurons-is-differentially-regulated-by-estradiol-through-estrogen-receptor-%C3%AE-in-adult-female-mice
#12
Luhong Wang, Laura L Burger, Megan L Greenwald-Yarnell, Martin G Myers, Suzanne M Moenter
Estradiol feedback regulates gonadotropin-releasing hormone (GnRH) neurons and subsequent luteinizing hormone (LH) release. Estradiol acts through estrogen receptor α (ERα)-expressing afferents of GnRH neurons including kisspeptin neurons in the anteroventral periventricular (AVPV) and arcuate nuclei, providing homeostatic feedback on episodic GnRH/LH release as well as positive feedback to control ovulation. Ionotropic glutamate receptors are important for estradiol feedback but it is not known where they fit in the circuitry...
November 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29110350/fertilizing-ability-of-canine-spermatozoa-cryopreserved-with-skim-milk-based-extender-in-a-retrospective-study
#13
Y Abe, S Yokozawa, R Umemiya-Shirafuji, Pfa Moumouni, Y Suwa, H Suzuki
We previously reported that skim milk (SM) is an effective cryoprotectant for cryopreservation of canine spermatozoa instead of egg yolk (EY), which is the conventional cryoprotectant. In this study, the fertilizing ability and practical use of frozen canine spermatozoa prepared with SM were evaluated by transcervical insemination. Frozen-thawed spermatozoa were inseminated one to four times on days 2-9 after the LH surge. In SM group, a single transcervical insemination (TCI) on Day 5 led to higher delivery rate (83%) than any other days (33%-50%) post-LH surge...
November 7, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/29102625/reprint-of-role-of-g-protein-coupled-estrogen-receptor-gper-gpr30-in-maintenance-of-meiotic-arrest-in-fish-oocytes
#14
REVIEW
Peter Thomas
An essential role for GPER (formerly known as GPR30) in regulating mammalian reproduction has not been identified to date, although it has shown to be involved in the regulation a broad range of other estrogen-dependent functions. In contrast, an important reproductive role for GPER in the maintenance of oocyte meiotic arrest has been identified in teleost fishes, which is briefly reviewed here. Recent studies have clearly shown that ovarian follicle production of estradiol-17β (E2) maintains meiotic arrest in several teleost species through activation of GPER coupled to a stimulatory G protein (Gs) on oocyte plasma membranes, resulting in stimulation of cAMP production and maintenance of elevated cAMP levels...
November 2, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29098175/inhibiting-production-of-new-brain-cells-during-puberty-or-adulthood-blunts-the-hormonally-induced-surge-of-luteinizing-hormone-in-female-rats
#15
Margaret A Mohr, Lydia L DonCarlos, Cheryl L Sisk
New cells are added during both puberty and adulthood to hypothalamic regions that govern reproduction, homeostasis, and social behaviors, yet the functions of these late-born cells remain elusive. Here, we pharmacologically inhibited cell proliferation in ventricular zones during puberty or in adulthood and determined subsequent effects on the hormone-induced surge of luteinizing hormone (LH) in female rats. Initial neuroanatomical analyses focused on verifying incorporation, activation, and pharmacological inhibition of pubertally or adult born cells in the anteroventral periventricular nucleus (AVPV) of the hypothalamus because of the essential role of the AVPV in triggering the preovulatory LH surge in females...
September 2017: ENeuro
https://www.readbyqxmd.com/read/29062796/controlled-ovarian-hyperstimulation-with-intrauterine-insemination-is-more-successful-after-r-hcg-administration-than-spontaneous-lh-surge
#16
Evan Taerk, Edward Hughes, Cassandra Greenberg, Michael Neal, Shilpa Amin, Mehrnoosh Faghih, Megan Karnis
BACKGROUND: The purpose of this study was to evaluate whether clinical pregnancy rate is affected by timing intrauterine insemination (IUI) according to serum LH surge, r-hCG trigger, or a combination of LH surge and r-hCG trigger in controlled ovarian hyperstimulation (COH) cycles for patients with a variety of infertility etiologies. METHODS: The last 365 consecutive COH-IUI cycles performed at ONE Fertility Burlington in 2014 were reviewed and categorized according to method of IUI timing...
July 2017: Journal of Reproduction & Infertility
https://www.readbyqxmd.com/read/29040622/neurokinin-b-regulates-gonadotropin-secretion-ovarian-follicle-growth-and-the-timing-of-ovulation-in-healthy-women
#17
Karolina Skorupskaite, Jyothis T George, Johannes D Veldhuis, Richard A Anderson
Context: Neurokinin B (NKB) is obligate for human puberty, but its role in adult female gonadotropin secretion and ovarian follicle growth is unknown. Objective: To investigate antagonism of NKB on pulsatile GnRH/LH secretion and ovarian follicle development in normal women. Design: Open investigation of the effects of a neurokinin-3 receptor antagonist (NK3Ra) vs no treatment control cycle. Setting: Clinical Research Facility...
October 12, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29037231/optimal-parameters-for-determining-the-lh-surge-in-natural-cycle-frozen-thawed-embryo-transfers
#18
Mohamad Irani, Alex Robles, Vinay Gunnala, David Reichman, Zev Rosenwaks
BACKGROUND: There is no consensus on the exact parameters that define the LH surge for natural cycle frozen-thawed embryo transfers (NC-FET). Accurately determining the LH surge would affect the timing, and subsequently the success rates, of embryo transfer. Therefore, the aim of this study was to delineate the optimal levels and relationship for luteinizing hormone (LH) and estradiol in an effort to optimally identify the LH surge in NC-FET. METHODS: It is a retrospective study that was performed in an academic medical center...
October 16, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/29029246/the-epidermal-growth-factor-network-role-in-oocyte-growth-maturation-and-developmental-competence
#19
Dulama Richani, Robert B Gilchrist
BACKGROUND: The LH surge induces great physiological changes within the preovulatory follicle, which culminate in the ovulation of a mature oocyte that is capable of supporting embryo and foetal development. However, unlike mural granulosa cells, the oocyte and its surrounding cumulus cells are not directly responsive to LH, indicating that the LH signal is mediated by secondary factors produced by the granulosa cells. The mechanisms by which the oocyte senses the ovulatory LH signal and hence prepares for ovulation has been a subject of considerable controversy for the past four decades...
September 20, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/29028571/identifying-ovarian-tissue-in-the-bitch-using-anti-m%C3%A3-llerian-hormone-amh-or-luteinizing-hormone-lh
#20
Helene Alm, Bodil S Holst
Reliable methods for determining whether or not a bitch has ovarian tissue present are needed for cases with unknown neutering status. Vaginal cytology consistent with heat is indicative of functional ovarian tissue. Other methods are required when the bitch is not presented in suspected heat. Progesterone can be analyzed during 2 months after suspected heat. During other stages, assays for the analyses of anti-Müllerian hormone (AMH) and luteinizing hormone (LH) have been used. The AMH assay is expected to give detectable concentrations (positive) in bitches with ovarian tissue, and the LH assay should give negative results in intact bitches, except during the pre-ovulatory LH peak...
September 27, 2017: Theriogenology
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