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Song Guo, Zhichao Li, Li Yan, Yijuan Sun, Yun Feng
Purpose: Adenomyosis has a negative impact on female fertility. GnRH agonist treatment can improve pregnancy outcomes in women with adenomyosis. However, the impact of GnRH agonist upon endometrium receptivity of patients with adenomyosis remains unclear. In this study, endometrial receptivity and pregnancy outcome were investigated using a mouse model of adenomyosis. Materials and methods: Adenomyosis was induced in 12 female ICR mice, neonatally treated with tamoxifen, while another six female mice (control group) received solvent only...
2018: Drug Design, Development and Therapy
M Faya, C Marchetti, M Priotto, M Grisolía, F D'Francisco, C Gobello
The objective of this study was to assess the efficiency and clinical safety of postnatal administration of a GnRH agonist on canine puberty postponement. Sexual steroids and histological gonadal changes were also described. Twenty-four littermate puppies were randomly assigned to: Deslorelin acetate 18.8 mg sc (DESLO; n = 12) or Placebo: sc (PLACE; n = 12) postnatally. The dogs were clinically and endocrinologically followed up until puberty when they were gonadectomized and their gonads histomorphometrically studied...
June 2, 2018: Theriogenology
María P Di Yorio, Daniela I Pérez Sirkin, José A Muñoz-Cueto, Tomás H Delgadin, Kazuyoshi Tsutsui, Gustavo M Somoza, Paula G Vissio
Reproduction is regulated by the hypothalamic-pituitary-gonadal axis. The first neuropeptide identified that regulates this function was the decapeptide gonadotropin-releasing hormone (GnRH). Nowadays, in gnatostomates, a number of GnRH variants have been identified and classified into three different types: GnRH1, GnRH2, and GnRH3. Almost 30 years later, a new peptide that inhibits gonadotropin synthesis and secretion was discovered and thus named as gonadotropin-inhibitory hormone (GnIH). In avians and mammals, the interaction and regulation between GnRH and GnIH neurons has been widely studied; however, in other vertebrate groups there is little information about the relationship between these neurons...
June 15, 2018: General and Comparative Endocrinology
Anand S Dixit, Sanborlang Byrsat
Day length has been shown to be a major source of temporal information regulating seasonal reproduction in the Eurasian tree sparrow (Passer montanus). The present study aims to investigate the photoperiodic expression of gonadotropin-releasing hormone-I (GnRH-I), and how it mediates seasonal reproduction in male tree sparrows. In different experiments, we studied photoperiod-induced changes in GnRH-I expressing neurons in the hypothalamic preoptic area (POA), together with changes in testicular size under both natural and artificial photoperiodic conditions...
June 18, 2018: Photochemical & Photobiological Sciences
J Manuel Palomino, Lori Jones, Tom Vanhanen, Gabriela F Mastromonaco, Rachel Busato, Gregg P Adams
This study evaluated the feasibility of using an embryo transfer protocol in an alpaca farm in Canada. Alpaca donors and recipients were synchronized with 2 doses of gonadotrophin-releasing hormone (GnRH), 12 days apart. In donors ( n = 5), superstimulation was induced with follicle stimulating hormone (FSH) given daily (40 mg) for 5 days beginning 2 days after the second GnRH treatment. Cloprostenol was given on the last day of FSH, the donors were bred 2 days later, embryos were collected 7 days after breeding...
June 2018: Canadian Veterinary Journal. la Revue Vétérinaire Canadienne
Wei Wang, Zhao-Xia Chen, Dong-Yu Guo, Ya-Xiong Tao
Regulation of prostate cancer by androgen and androgen receptor (AR), and blockade of AR signaling by AR antagonists and steroidogenic enzyme inhibitors have been extensively studied. G protein-coupled receptors (GPCRs) are a family of membrane receptors that regulate almost all physiological processes. Nearly 40% of FDA-approved drugs in the market target GPCRs. A variety of GPCRs that mediate reproductive function have been demonstrated to be involved in the regulation of prostate cancer. These GPCRs include gonadotropin-releasing hormone receptor, luteinizing hormone receptor, follicle-stimulating hormone receptor, relaxin receptor, ghrelin receptor, and kisspeptin receptor...
June 15, 2018: Pharmacology & Therapeutics
Ila Mishra, Neha Agarwal, Sangeeta Rani, Vinod Kumar
Circannual rhythm regulates annual timing of reproduction in spotted munia, with sex-differences in its relationship with the external photoperiod environment. Interestingly, munia show an atypical photosensitivity and exhibit gonadal maturation when acutely exposed to an unnatural short photoperiod (e.g. 3 h light per day; i.e. a long scotoperiod). The proximate mechanisms regulating scotoperiod-induced hypothalamus-pituitary-gonadal (HPG) activation are unclear. Since thyroid hormone signalling plays a central role in photoperiodic induction, we hypothesized the involvement of similar mechanism, i...
June 16, 2018: Journal of Neuroendocrinology
Denise Niza Benardete-Harari, José Manuel Muñoz-de Cote Frade, Jaime Antonio Hidalgo-Carrera, Alberto Felgueres-Hermida, Diego Meraz-Ávila
Background: Umbilical endometriosis or Villar’s nodule is uncommon. Incidence goes up to 0.5-1.2% of all patients with endometriosis. As far as 2012, only 109 cases of umbilical endometriosis have been reported worldwide, there is no incidence reports in Mexico. Clinically, it’s a solitary node, solid and well defined, colored red, blue or black and it’s ocassionally accompanied by bleeding and dysmenorrhea. The treatment can be medical or surgical and it consists of painkillers, and hormonal suppression using GnRH analogues, hormonal contraceptives, danazol or progesterone...
March 2018: Revista Médica del Instituto Mexicano del Seguro Social
Rachel A Ross, Silvia Leon, Joseph C Madara, Danielle Schafer, Chrysanthi Fergani, Caroline A Maguire, Anne Mj Verstegen, Emily Brengle, Dong Kong, Allan E Herbison, Ursula B Kaiser, Bradford B Lowell, Victor M Navarro
Pituitary adenylate cyclase activating polypeptide (PACAP, Adcyap1 ) is a neuromodulator implicated in anxiety, metabolism and reproductive behavior. PACAP global knockout mice have decreased fertility and PACAP modulates LH release. However, its source and role at the hypothalamic level remain unknown. We demonstrate that PACAP-expressing neurons of the ventral premamillary nucleus of the hypothalamus (PMVPACAP ) project to, and make direct contact with, kisspeptin neurons in the arcuate and AVPV/PeN nuclei and a subset of these neurons respond to PACAP exposure...
June 15, 2018: ELife
Anna Szeliga, Adam Czyzyk, Agnieszka Podfigurna, Andrea R Genazzani, Alessandro D Genazzani, Blazej Meczekalski
Women during perimenopausal period experience a range of symptoms, which interfere with physical, sexual, and social life. About 65-75% of symptoms connected with postmenopausal period are vasomotor symptoms (VMS), such as hot flushes and night sweats. Hot flushes are subjective sensation of heat associated with cutaneous vasodilatation and drop in core temperature. It is suspected that VMS are strongly correlated with pulsatile oversecretion of gonadotropin-releasing hormone (GnRH) and subsequently luteinizing hormone (LH)...
June 14, 2018: Gynecological Endocrinology
Eva Maria Greunz, Anne K H Krogh, Wouter Pieters, Olga Amann Ruiz, Julia Bohner, Anja Reckendorf, Davide Monaco, Mads Frost Bertelsen
  Acute-phase reactants indicate inflammation and are increasingly used in veterinary medicine to indicate and to monitor progression of disease. Hemostasis and inflammation have interconnected pathophysiologic pathways and influence each other on different levels. This study established observed normal ranges for acute-phase reactants and for coagulation and thromboelastographic (TEG) parameters in 49 dromedary camels ( Camelus dromedarius) and assessed the response to chronic and acute inflammation. Chronically infected animals suffering from lymph abscessation due to Corynebacterium spp...
June 2018: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
Teruyuki Higa, Hana Takahashi, Sayomi Higa-Nakamine, Mikio Suzuki, Hideyuki Yamamoto
Gonadotropin-releasing hormone (GnRH) is secreted from hypothalamic neurons (GnRH neurons) and stimulates anterior pituitary gonadotrophs to synthesize and secrete gonadotropins. In addition to gonadotrophs, GnRH neurons also express GnRH receptors, and the autocrine action of GnRH is reportedly involved in the regulation of functions of GnRH neurons. There is accumulating evidence that extracellular signal-regulated kinase (ERK), one of mitogen-activated protein kinases (MAPKs), is activated by GnRH and involved in various effects of GnRH in GnRH neurons...
2018: Biomedical Research
Richard Piet, Bruna Kalil, Tim McLennan, Robert Porteous, Katja Czieselsky, Allan E Herbison
A population of kisspeptin-GABA co-expressing neurons located in the rostral periventricular area of the third ventricle (RP3V) is believed to activate gonadotropin-releasing hormone (GnRH) neurons to generate the luteinizing hormone (LH) surge triggering ovulation. Selective optogenetic activation of RP3V kisspeptin (RP3VKISS ) neurons in female mice for >30s and ≥10Hz in either a continuous or bursting mode was found to reliably generate a delayed and long-lasting activation of GnRH neuron firing in brain slices...
June 13, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Bufang Xu, Mingjuan Zhou, Jingwen Wang, Dan Zhang, Feng Guo, Chenchen Si, Peter C K Leung, Aijun Zhang
STUDY QUESTION: Is allograft inflammatory factor-1 (AIF-1), a cytokine associated with inflammation and allograft rejection, aberrantly elevated in in vitro fertilization (IVF) cycles with gonadotropin-releasing hormone (GnRH) antagonist protocol with potential effects on endometrial receptivity? SUMMARY ANSWER: Our findings indicated AIF-1 is increased in IVF cycles with GnRH antagonist protocol and mediates greater TNF-α expression during implantation phase, which may be unfavorable for embryo implantation...
June 12, 2018: Human Reproduction
Gideon Omariba, Li Tong, Maochun Wang, Kai Li, Yuxun Zhou, Junhua Xiao
Puberty onset is a milestone in sexual development. A tumor suppress gene (TSG) network had been reported to be involved in the regulation of female puberty onset. The observations in rodents and primates showed a potential link between microRNAs and puberty onset. To figure out what miRNAs play roles in this important biological process, profilings of microRNAs in the hypothalamus of female mice from three different pubertal stages, juvenile [postnatal day (P10)], early pubertal (P25) and pubertal (P30) were performed on the Affymetrix GeneChip miRNA 3...
March 2018: Genes & Genomics
Yusuke Suzuki, Masaaki Ii, Takashi Saito, Yoshito Terai, Yasuhiko Tabata, Masahide Ohmichi, Michio Asahi
Uterine leiomyoma is the most common benign tumour in women, and an appropriate animal model for leiomyoma would be useful for exploring new therapeutic strategies. Therefore, we have been challenged to develop a new simple mouse model for human leiomyoma. Leiomyoma tissues were harvested from myomas resected by different surgical procedures with or without gonadotropin-releasing hormone agonist (GnRHa) treatment and were subcutaneously implanted into BALB/c nude mice with an estradiol/progesterone-releasing pellet...
June 11, 2018: Scientific Reports
Li-Qing He, Xu-Zi Cai, Yan Wang, Xue-Feng Wang
OBJECTIVE: To investigate the impact of conservative laparoscopic surgery for endometriosis with postoperative gonadotropin-releasing hormone agonist (GnRHa) therapy on the pregnancy outcomes in patients with endometriosis-associated infertility. METHODS: The clinical data were collected from the patients with endometriosis-associated infertility undergoing conservative laparoscopic surgery in our department between January, 2011 and December, 2016. The patients were divided into laparoscopic surgery only group (without any other treatments) and postoperative GnRha therapy group, and the pregnancy outcomes were compared between the two groups at different time points during the follow-up...
May 20, 2018: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
B R Crites, R Vishwanath, A M Arnett, P J Bridges, W R Burris, K R McLeod, L H Anderson
The objective of this study was to compare conception rates of female beef cattle inseminated at a fixed-time with either conventional (CON) or SexedUltra™ sex-sorted (SU) semen. Treatments included CON or SU with two sires represented within each treatment. Cows (n = 316) and heifers (n = 78) from six locations were randomly assigned treatment. Ovulation was synchronized in all females using the industry-standard 7-d CO-Synch + controlled internal drug release (CIDR) protocol (100 μg GnRH + CIDR [1...
June 6, 2018: Theriogenology
Eric Surrey, Hugh S Taylor, Linda Giudice, Bruce A Lessey, Mauricio S Abrao, David F Archer, Michael P Diamond, Neil P Johnson, Nelson B Watts, J Chris Gallagher, James A Simon, Bruce R Carr, W Paul Dmowski, Nicholas Leyland, Sukhbir S Singh, Tomasz Rechberger, Sanjay K Agarwal, W Rachel Duan, Brittany Schwefel, James W Thomas, Paul M Peloso, Juki Ng, Ahmed M Soliman, Kristof Chwalisz
OBJECTIVE: To evaluate the efficacy and safety of elagolix, an oral, nonpeptide gonadotropin-releasing hormone antagonist, over 12 months in women with endometriosis-associated pain. METHODS: Elaris Endometriosis (EM)-III and -IV were extension studies that evaluated an additional 6 months of treatment after two 6-month, double-blind, placebo-controlled phase 3 trials (12 continuous treatment months) with two elagolix doses (150 mg once daily and 200 mg twice daily)...
June 6, 2018: Obstetrics and Gynecology
Ivan Mazzon, Alessandro Favilli, Mario Grasso, Stefano Horvath, Vittorio Bini, Gian Carlo Di Renzo, Sandro Gerli
Introduction: The aim of the study was to analyze which variables influenced the completion of a cold loop hysteroscopic myomectomy in a one-step procedure in a large cohort of patients. Materials and Methods: A retrospective cohort study of 1434 cold loop resectoscopic myomectomies consecutively performed. The study population was divided into two groups according to the number of procedures needed to accomplish the treatment. Variables influencing the completion of hysteroscopic myomectomy in a one-step procedure were investigated...
2018: BioMed Research International
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