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GnRH Antagonist

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https://www.readbyqxmd.com/read/29453138/increased-coagulation-index-as-measured-by-thromboelastography-during-ovarian-stimulation-for-in-vitro-fertilization-influence-of-the-final-oocyte-maturation-triggering-agent
#1
Ronit Beck-Fruchter, Israel Gavish, Shira Baram, Yoel Geslevich, Amir Weiss
OBJECTIVE: Thromboelastography (TEG) is a viscoelastic test of hemostasis which allows measurement of the processes of clot initiation, propagation, stabilization, and dissolution in real time. In this study we aimed to evaluate the alterations in coagulation as measured by TEG during In Vitro Fertilization (IVF) stimulation cycles and to investigate whether final oocyte maturation with recombinant hCG (rhCG) versus GnRH agonist results in a different coagulation state. STUDY DESIGN: This is a prospective observational study which included fifty-three normogonadotrophic women...
February 10, 2018: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/29446744/delivery-of-peptidic-gonadotropin-releasing-hormone-antagonists
#2
Rawda Yaseen AlSheyyab, Bashar Mohammad Al-Taani, Rana Mohammad Obeidat, Motasem Mohammad Alsmadi, Rafeef Khalid Masaedeh, Raghda Nasry Sabat
GnRH antagonists have several clinical applications in prostate cancer, regulation of ovulation induction in females, breast cancer, male contraception and others. Antagonists differ from natural GnRH decapeptide in having five or more amino acid substitutions. Whereas most of antagonists are available as subcutaneous (SC) formula for injection, some are formulated as a depot formulation for sustained release (e.g. Cetrarelix, Degarelix). Systemic delivery of cetrorelix acetate by intratracheal route can be achieved using dry powder for inhalation of adhesive mixture when the powder deposition reaches stage four...
February 14, 2018: Current Drug Delivery
https://www.readbyqxmd.com/read/29438534/both-in-vivo-fsh-depletion-and-follicular-exposure-to-gonadotrophin-releasing-hormone-analogues-in-vitro-are-not-effective-to-prevent-follicular-depletion-during-chemotherapy-in-mice
#3
F Horicks, G Van Den Steen, C Gervy, H J Clarke, I Demeestere
STUDY QUESTION: Does fertility preservation using gonadotrophin-releasing hormone (GnRH) analogues during chemotherapy act through a direct effect on the ovary or through inhibition of FSH secretion? SUMMARY ANSWER: The absence of FSH in vivo and the direct exposition of ovarian follicles to GnRH analogues in vitro did not prevent chemotherapy-induced ovarian damage. WHAT IS KNOWN ALREADY: The potential mechanisms of action of GnRH analogues in protecting ovaries against chemotherapy damage remain poorly understood...
February 9, 2018: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29435182/dual-trigger-of-triptorelin-and-hcg-optimizes-clinical-outcome-for-high-ovarian-responder-in-gnrh-antagonist-protocols
#4
Saijiao Li, Danni Zhou, Tailang Yin, Wangming Xu, Qingzhen Xie, Dan Cheng, Jing Yang
In this paper, a retrospective cohort study was conducted to the high ovarian responders in GnRH-antagonist protocols of IVF/ICSI cycles. The purpose of the study is to investigate whether dual triggering of final oocyte maturation with a combination of gonadotropin-releasing hormone (GnRH) agonist and human chorionic gonadotropin (HCG) can improve the clinical outcome compared with traditional dose (10000IU) HCG trigger and low-dose (8000IU) HCG trigger for high ovarian responders in GnRH-antagonist in vitro fertilization/intracytoplasmic sperm injection (IVF-ICSI) cycles...
January 12, 2018: Oncotarget
https://www.readbyqxmd.com/read/29430154/repeat-dose-of-gonadotropin-releasing-hormone-agonist-trigger-in-polycystic-ovarian-syndrome-undergoing-in-vitro-fertilization-cycles-provides-a-better-cycle-outcome-a-proof-of-concept-study
#5
Krishna Deepika, Pookilath Baiju, Praneesh Gautham, Rathore Suvarna, Vohra Arveen, Rao Kamini
Objective: Is a single dose of gonadotropin-releasing hormone agonist (GnRHa) trigger to induce final oocyte maturation in polycystic ovarian syndrome (PCOS) undergoing in vitro fertilization (IVF) cycles with GnRH antagonist protocol sufficient to provide optimal oocyte maturity? Design: This is a prospective, randomized, double-blind, proof-of-concept study. Setting: This study was carried out at a tertiary care center. Material and Methods: A total of 125 patients diagnosed with PCOS defined as per the ESHRE/ASRM Rotterdam criteria (2003) undergoing IVF in antagonist protocol were randomized into two groups...
October 2017: Journal of Human Reproductive Sciences
https://www.readbyqxmd.com/read/29430153/the-impact-of-progesterone-level-on-day-of-hcg-injection-in-ivf-cycles-on-clinical-pregnancy-rate
#6
Jawa Ashmita, Swarankar Vikas, Garg Swati
Background: Premature progesterone rise (PPR) has long been implicated as contributing to implantation failure. Despite the use of gonadotropin-releasing hormone (GnRH) analogues, subtle increases in serum progesterone ( P 4 ) levels beyond a threshold progesterone concentration were observed on the day of trigger in controlled ovarian hyperstimulation cycles. Aims: The purpose of the study was to evaluate the incidence of PPR on the day of trigger in conventional IVF/ICSI cycles and its impact on clinical pregnancy rate...
October 2017: Journal of Human Reproductive Sciences
https://www.readbyqxmd.com/read/29404536/low-dose-hcg-as-trigger-day-and-35-hr-later-have-different-ovarian-hyperstimulation-syndrome-occurrence-in-females-undergoing-in-vitro-fertilization-an-rct
#7
Marzieh Aghahosseini, Ashraf Aleyasin, Venus Chegini, Victoria Chegini
Background: Ovarian hyperstimulation syndrome (OHSS) is an iatrogenic complication, which can cause high morbidity and mortality. Use of gonadotropin releasing hormone (GnRH) agonist instead of human chorionic gonadotropin (hCG) in GnRH antagonist cycles causes luteinizing hormone surge by GnRH stimulation which reduces the risk of OHSS by reducing the total amount of gonadotropin; however, there is no possibility of transferring fresh embryos. Objective: The current study aimed to evaluate the effect of hCG along with GnRH agonist administration in the occurrence of OHSS and pregnancy rate in females undergoing in vitro fertilization...
November 2017: International Journal of Reproductive Biomedicine (Yazd, Iran)
https://www.readbyqxmd.com/read/29402595/lower-rate-of-early-pregnancy-loss-in-patients-experiencing-early-onset-low-lh-in-gnrh-antagonist-cycles-supplemented-with-menotropin
#8
Po-Kai Yang, Ming-Yih Wu, Kuang-Han Chao, Chin-Hao Chang, Mei-Jou Chen, Shee-Uan Chen
BACKGROUND/PURPOSE: The role of LH during controlled ovarian stimulation (COS) in the general population remains contentious. There is no consensus on the indications for LH supplementation during COS. The purpose of this study is to determine whether menotropin supplement is associated with decreases in early pregnancy loss rates in patients exhibiting low endogenous LH during COS. METHOD: This is a single-center, retrospective cohort from a university-affiliated hospital...
February 2, 2018: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/29395088/trek2a-regulates-gnrh3-expression-under-control-of-melatonin-receptor-mt1-and-%C3%AE-2-adrenoceptor
#9
Kavinash Loganathan, Shogo Moriya, Ishwar S Parhar
Gonadotrophin-releasing hormone (GnRH) expression is associated with the two-pore domain potassium ion (K+) channel-related K+ (TREK) channel trek2a expression and melatonin levels. We aimed to investigate correlation of trek2a expression with gnrh3 expression, and regulatory mechanisms of trek2a expression by the melatonin receptor Mt1 and α2-adrenoceptor which are regulated by melatonin. trek2a specific siRNA, Mt1 antagonist luzindole and α2-adrenoceptor antagonist prazosin were administered into the adult zebrafish brain and gene expressions were examined by real-time PCR...
January 22, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29388691/comparison-of-dual-trigger-with-combination-gnrh-agonist-and-hcg-versus-hcg-only-trigger-of-oocyte-maturation-for-normal-ovarian-responders
#10
Xingyu Zhou, Pingping Guo, Xin Chen, Desheng Ye, Yudong Liu, Shiling Chen
OBJECTIVE: To investigate whether dual triggering of oocyte maturation with a gonadotropin-releasing hormone (GnRH) agonist and standard dose of human chorionic gonadotropin (hCG) can improve clinical outcomes for normal ovarian responders in GnRH antagonist cycles. METHODS: The present retrospective cohort study included women aged up to 40 years with normal ovarian response who underwent in vitro fertilization and/or intracytoplasmic sperm injection under the GnRH antagonist protocol at Nanfang Hospital, China, between January 1 and December 31, 2015...
February 1, 2018: International Journal of Gynaecology and Obstetrics
https://www.readbyqxmd.com/read/29386731/severe-ovarian-hyperstimulation-syndrome-can-we-eliminate-it-through-a-multipronged-approach
#11
Nikita Naredi, S K Singh, Prasad Lele, N Nagraj
Background: Prevention of severe Ovarian Hyperstimulation Syndrome (OHSS), a potentially fatal complication of controlled ovarian hyperstimulation has been the aim of all fertility experts. Various pharmacologic and non-pharmacologic interventions have been instituted but the results have been conflicting. These preventive strategies were administered in isolation or as a combination of few aiming to eliminate this iatrogenic sequel. This study aimed to eliminate severe OHSS by multipronged approach incorporating almost all preventive modalities available in patients at high risk for this dreadful complication...
January 2018: Medical Journal, Armed Forces India
https://www.readbyqxmd.com/read/29378196/additive-effect-of-simultaneous-continuous-administration-of-degarelix-and-tak-448-on-lh-suppression-in-a-castrated-rat-model
#12
Jacek Stalewski, Diane M Hargrove, Monica Wolfe, Trudy A Kohout, Adeela Kamal
Gonadotropin releasing hormone (GnRH) analogs have long been used in androgen deprivation therapy (ADT) in the treatment of prostate cancer. Chronic administration of either GnRH agonists or antagonists leads to suppression of testosterone production in the testes via either downregulation or direct blockade of the GnRH receptor in the pituitary, respectively. Chronic administration of kisspeptin analogs has more recently been shown to lead to testosterone suppression via desensitization of GnRH neurons in the hypothalamus and an optimized kisspeptin analog, TAK-448, was proven effective in a small phase 1 trial...
January 25, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29376451/infertile-polycystic-ovary-syndrome-patients-undergoing-in-vitro-fertilization-with-the-gonadotropin-releasing-hormone-antagonist-protocol-role-of-hyperandrogenism
#13
Wan Yang, Rui Yang, Shuo Yang, Jia Li, Binbin Tu, Chang Gao, Ying Wang
This retrospective cohort study is to assess the effects of hyperandrogenism (HA) in polycystic ovary syndrome (PCOS) patients with gonadotropin-releasing hormone (GnRH)-antagonist protocol during in vitro fertilization (IVF). Total 892 infertile Patients between 20 and 35 years of age with normal body mass index (BMI, 18.50 -24.99 kg/m2), including those with tubal factor infertility (control, n = 318), PCOS infertility with HA (HA PCOS, n = 244), and PCOS infertility without HA (non-HA PCOS, n = 330), were included...
January 28, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29373930/does-progesterone-to-oocyte-index-have-a-predictive-value-for-ivf-outcome-a-retrospective-cohort-and-review-of-the-literature
#14
Leonti Grin, Yossi Mizrachi, Ornit Cohen, Tal Lazer, Gad Liberty, Simion Meltcer, Shevach Friedler
The potential adverse effect of Serum progesterone (SP) elevation on the day of hCG administration is a matter of continued debate. Our study aimed to evaluate the relative value of progesterone to a number of aspirated oocytes ratio (POI) to predict clinical pregnancy (CP) and live birth (LB) in fresh IVF cycles and to review the relevant literature. A retrospective analysis of GnRH Antagonist IVF-ET cycles. POI was calculated by dividing the SP on the day of hCG by the number of aspirated mature oocytes. A multivariate logistic regression analysis was performed to evaluate the predictive value of POI for CP and LB...
January 26, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29345163/low-dose-hp-hmg-in-an-antagonist-protocol-for-ivf-in-ovulatory-and-anovulatory-patients-with-high-amh
#15
Negjyp Sopa, Elisabeth Clare Larsen, Anders Nyboe Andersen
Women with high-AMH levels have an increased risk of ovarian hyperstimulation syndrome (OHSS). Studies have suggested that highly purified menotropin (HP-hMG) Menopur® reduces the risk. We, therefore, studied use of low-dose (112.5 IU/day) HP-hMG in ovulatory and anovulatory patients with high AMH (>32 pmol/L). The primary endpoint was the distribution of patients with appropriate, excessive, and inadequate response (5-14, ≥15, and ≤4 oocytes). Another endpoint was frequency of OHSS. Totally 115 women were included and 78 (67...
January 18, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29335207/synthesis-and-biological-evaluation-of-3-2-aminoethyl-uracil-derivatives-as-gonadotropin-releasing-hormone-gnrh-receptor-antagonists
#16
Seon-Mi Kim, Minhee Lee, So Young Lee, Soo-Min Lee, Eun Jeong Kim, Jae Sun Kim, Jihyae Ann, Jiyoun Lee, Jeewoo Lee
We investigated a series of uracil analogues by introducing various substituents on the phenyl ring of the N-3 aminoethyl side chain and evaluated their antagonistic activity against human gonadotropin-releasing hormone (GnRH) receptors. Analogues with substituents at the ortho or meta position demonstrated potent in vitro antagonistic activity. Specifically, the introduction of a 2-OMe group enhanced nuclear factor of activated T-cells (NFAT) inhibition up to 6-fold compared to the unsubstituted analogue...
January 2, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29334275/laparoscopic-ovarian-drilling-versus-gnrh-antagonist-combined-with-cabergoline-as-a-prophylaxis-against-the-re-development-of-ovarian-hyperstimulation-syndrome
#17
Emaduldin Seyam, Enas Hefzy
OBJECTIVE: The aim of this work was to investigate the value of laparoscopic ovarian drilling (LOD) compared with GnRH antagonist flexible protocol combined with cabergoline (Cb), as a prophylaxis against the re-development of ovarian hyperstimulation syndrome (OHSS) in women with clomiphene citrate-resistant polycystic ovary disease (CCR-PCOD) who had severe OHSS before in a previous ICSI cycle. STUDY DESIGN: It is a prospective controlled study, where 250 CCR-PCOD women (n = 250) with a history of severe OHSS before, had been recruited for the study...
January 15, 2018: Gynecological Endocrinology
https://www.readbyqxmd.com/read/29315797/high-luteinizing-hormone-weakens-urinary-continence-mechanisms-in-association-with-prostaglandin-e2-elevation-in-a-postmenopausal-rat-model
#18
Tomohiro Eriguchi, Naoki Kawamorita, Natsuho Hayashi, Yohei Satake, Hideaki Izumi, Yasuhiro Kaiho, Yoichi Arai
AIMS: To explore the role of luteinizing hormone (LH) in the urinary continence mechanism, urethral function was investigated using a postmenopausal rat model with high serum LH concentrations and the postmenopausal rat model given a gonadotropin releasing hormone (GnRH) antagonist to lower LH concentrations. METHODS: Adult female rats were divided into: 1) sham group; 2) ovariectomy group (OVX) with removal of bilateral ovaries; 3) OVX and GnRH-antagonist administered group (OVX + G); and 4) sham and GnRH-antagonist administered group (Sham + G)...
January 9, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29303236/andro-ivf-a-novel-protocol-for-poor-responders-to-ivf-controlled-ovarian-stimulation
#19
Ludmila Bercaire, Sara Mb Nogueira, Priscila Cm Lima, Vanessa R Alves, Nilka Donadio, Artur Dzik, Mario Cavagna, Renato Fanchin
OBJECTIVE: This study aimed to assess a novel protocol designed to improve poor ovarian response through intra-ovarian androgenization. The endpoints were: number of oocytes and mature oocytes retrieved, fertilization, cancellation and pregnancy rates. METHODS: This prospective crossover study enrolled poor responders from previous ovarian stimulation cycles submitted to a novel protocol called ANDRO-IVF. The protocol included pretreatment with transdermal AndroGel(r) (Besins) 25 mg, oral letrozole 2...
January 5, 2018: JBRA Assisted Reproduction
https://www.readbyqxmd.com/read/29300905/reply-gnrh-antagonists-vs-long-gnrh-agonists-in-ivf-significant-flaws-in-a-meta-analysis-lead-to-invalid-conclusions
#20
C B Lambalk, F R Banga, J A Huirne, M Toftager, A Pinborg, R Homburg, F van der Veen, M van Wely
No abstract text is available yet for this article.
December 29, 2017: Human Reproduction Update
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