نتایج جستجو برای: gonadotropin releasing hormone

تعداد نتایج: 165313  

2017
Kazuhiro SATOU Yuta MOCHIMARU Takashi NAKAKURA Tomoyuki KUSADA Jun NEGISHI Shiori MUSHA Nanaka YOSHIMURA Yukio KATO Hideaki TOMURA

Reproduction is regulated by gonadotropins secreted from gonadotrophs. The production and secretion of gonadotropins are mainly regulated by gonadotropin-releasing hormone (GnRH). Agonists or antagonists that influence GnRH action on gonadotrophs are important to regulate reproduction; however, these factors have not been fully characterized due to the lack of simple and easy-to-use techniques ...

Journal: :Endokrynologia Polska 2008
Robert Krysiak Bogdan Marek Bogusław Okopień

Central precocious puberty, defined as the onset of puberty before the age 8 years in girls and 9 years in boys, results from a premature activation of gonadotropin-releasing hormone neurons in the hypothalamus. This condition is characterised by early pubertal changes, acceleration of growth velocity, and rapid bone maturation that often result in reduced adult height. It may be either idiopat...

Journal: :Peptides 1988
E G Stopa S A Sower C N Svendsen J C King

A non-mammalian lamprey-like gonadotropin-releasing hormone (lGnRH) has been detected in human hypothalami using a combination of immunocytochemistry, high performance liquid chromatography and radioimmunoassay. The hypothalamic distribution of immunopositive lGnRH neurons is similar to that observed for those containing the mammalian gonadotropin-releasing hormone (mGnRH), indicating a possibl...

2013
Fugui Fang Shiping Su Ya Liu Yunhai Zhang Yong Pu Xijie Zhao Yunsheng Li Hongguo Cao Juhua Wang Jie Zhou Xiaorong Zhang

BACKGROUND Gonadotropin cell is the main responsible for the secretion of follicle stimulating hormone (FSH) and luteinizing hormone (LH), and immunocastration reduces the concentrations of serum FSH and LH. A few studies have reported the histological structure of gonadotropin cells obtained from immunocastration animals at the light microscopy level. However, the ultrastructure of gonadotropi...

2014
Satoshi Ogawa Ishwar S. Parhar

Gonadotropin-inhibitory hormone (GnIH) was discovered as a novel hypothalamic peptide that inhibits gonadotropin release in the quail. The presence of GnIH-homologous peptides and its receptors (GnIHRs) have been demonstrated in various vertebrate species including teleosts, suggesting that the GnIH-GnIHR family is evolutionarily conserved. In avian and mammalian brain, GnIH neurons are localiz...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2002
J K Hiney S A Sower W H Yu S M McCann W L Dees

This study utilized a newly developed antiserum, specific for lamprey gonadotropin-releasing hormone III (l-GnRH-III), to determine the following: in which regions of the rat hypothalamus the neuronal perikarya producing l-GnRH-III are localized; and whether this peptide, known to selectively induce follicle-stimulating hormone release, is coexpressed in neurons containing mammalian luteinizing...

Journal: :international journal of reproductive biomedicine 0
javid ahmad ganaie vinoy k shrivastava

background: gonadotropin releasing hormone conjugate (gnrh-bsa) raises antibodies against biologically active gonadotropin releasing hormone (gnrh) which affects body weight, gonadosomatic indices (gsi) and sperm quality in male mice. objective: the objective of this experimental investigation is to develop an effective and reliable hormonal immunocontraceptive vaccine to suppress spermatogenes...

Journal: :Reproductive biology 2007
Anna Leska Luiza Dusza

Seasonal reproduction in birds is the adaptation to breed at the time of the greatest survival of young. This exact moment is mainly imposed by the photoperiod which stimulates the hypothalamo-pituitary-gonadal axis and starts breeding season. This article summarizes present knowledge concerning: 1/ perception and transduction of light into the biological signal; 2/ model of the avian photoperi...

Journal: :Archives of medical research 2001
S M McCann S Karanth C A Mastronardi W L Dees G Childs B Miller S Sower W H Yu

Fractionation of hypothalamic extracts on a Sephadex G-25 column separates follicle-stimulating hormone-releasing factor (FSHRF) from luteinizing hormone-releasing hormone (LHRH). The FSH-releasing peak contained immunoreactive lamprey gonadotropin-releasing hormone (lGnRH) by radioimmunoassay, and its activity was inactivated by an antiserum specific to lGnRH. The identity of lGnRH-III with FS...

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