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Gonadotropin-releasing hormone (GnRH) is a releasing hormone responsible for the release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the anterior pituitary. GnRH is a tropic peptide hormone synthesized and released from GnRH neurons within the hypothalamus .
The gonadotropin-releasing hormones (GnRH) (gonadoliberin) [1] are a family of peptides that play a pivotal role in reproduction. The main function of GnRH is to act on the pituitary to stimulate the synthesis and secretion of luteinizing and follicle-stimulating hormones, but GnRH also acts on the brain, retina, sympathetic nervous system, gonads, and placenta in certain species.
Gonadotropins are glycoprotein hormones secreted by gonadotropic cells of the anterior pituitary of vertebrates. [1] [2] [3] This family includes the mammalian hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH), the placental/chorionic gonadotropins, human chorionic gonadotropin (hCG) and equine chorionic gonadotropin (eCG), [3] as well as at least two forms of fish ...
GnRH is a hormone released by the hypothalamus, and it is responsible for signaling gonadotrophs to release gonadotropins FSH and LH. GnRH binds to gonadotropin-releasing hormone receptors (GnRHR), which is a G-protein coupled receptor , and signals the oscillation of calcium that hyperpolarizes gonadotropic cell membranes. [ 6 ]
Releasing hormones increase (or, in case of inhibitory factors, decrease) the intracellular concentration of calcium (Ca 2+), resulting in vesicle fusion of the respective primary hormone. [citation needed] For GnRH, TRH and GHRH the increase in Ca 2+ is achieved by the releasing hormone coupling and activating G protein coupled receptors ...
A gonadotropin-releasing hormone antagonist (GnRH antagonist) is a GnRH modulator that blocks the GnRH receptor resulting in an immediate drop in gonadotropin (FSH, LH) secretion. GnRH antagonists are primarily used in IVF treatments to block natural ovulation.
A gonadotropin-releasing hormone agonist (GnRH agonist) is a type of medication which affects gonadotropins and sex hormones. [1] They are used for a variety of indications including in fertility medicine and to lower sex hormone levels in the treatment of hormone-sensitive cancers such as prostate cancer and breast cancer, certain gynecological disorders like heavy periods and endometriosis ...
Human chorionic gonadotropin (hCG), progesterone, 17β-estradiol, endorphins and gonadotropin-releasing hormone (GnRH) synthesis are rapidly upregulated by the developing embryo following fertilization of the ovum. [1] [2] [3] During early embryonic development, paracrine/juxtacrine signaling of hCG induces blastulation and neurulation.
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