词条 | Follicle-stimulating hormone |
释义 |
| Name = glycoprotein hormones, alpha polypeptide | caption =FSH (α-FSH (green), β-FSH (orange)) with receptors (blue) | image =FSHA+B+receptor 1XWD.png | width = | HGNCid = 1885 | Symbol = CGA | AltSymbols = | EntrezGene = 1081 | OMIM = 118850 | RefSeq = NM_000735 | UniProt = P01215 | PDB = | ECnumber = | Chromosome = 6 | Arm = q | Band = 14 | LocusSupplementaryData = -q21 }}{{infobox protein | Name = follicle stimulating hormone, beta polypeptide | caption = Follicle-stimulating hormone | image = Follitropine.gif | width = 320 | HGNCid = 3964 | Symbol = FSHB | AltSymbols = | EntrezGene = 2488 | OMIM = 136530 | RefSeq = NM_000510 | UniProt = P01225 | PDB = | ECnumber = | Chromosome = 11 | Arm = p | Band = 13 | LocusSupplementaryData = }} Follicle-stimulating hormone (FSH) is a gonadotropin, a glycoprotein polypeptide hormone. FSH is synthesized and secreted by the gonadotropic cells of the anterior pituitary gland,[1] and regulates the development, growth, pubertal maturation, and reproductive processes of the body. FSH and luteinizing hormone (LH) work together in the reproductive system. Structure{{multiple issues|section=yes|{{refimprove section|date=February 2013}}{{confusing|section|date=February 2013}}{{technical|section needs attention from an expert from either Molecular Biology or Medicine because it|date=February 2013}}}} FSH is a 35.5 kDa glycoprotein heterodimer, consisting of two polypeptide units, alpha and beta. Its structure is similar to those of luteinizing hormone (LH), thyroid-stimulating hormone (TSH), and human chorionic gonadotropin (hCG). The alpha subunits of the glycoproteins LH, FSH, TSH, and hCG are identical and consist of 96 amino acids, while the beta subunits vary.[2][3] Both subunits are required for biological activity. FSH has a beta subunit of 111 amino acids (FSH β), which confers its specific biologic action, and is responsible for interaction with the follicle-stimulating hormone receptor.[4] The sugar portion of the hormone is covalently bonded to asparagine, and is composed of N-acetylgalactosamine, mannose, N-acetylglucosamine, galactose, and sialic acid. GenesIn humans, the gene for the alpha subunit is located at cytogenetic location 6q14.3.[5] It is expressed in two cell types, most notably the basophils of the anterior pituitary. The gene for the FSH beta subunit is located on chromosome 11p13, and is expressed in gonadotropes of the pituitary cells, controlled by GnRH, inhibited by inhibin, and enhanced by activin. Activity/functionsFSH regulates the development, growth, pubertal maturation and reproductive processes of the human body.
Control of FSH release from the pituitary gland is unknown. Low frequency gonadotropin-releasing hormone (GnRH) pulses increase FSH mRNA levels in the rat,[6] but is not directly correlated with an increase in circulating FSH.[7] GnRH has been shown to play an important role in the secretion of FSH, with hypothalamic-pituitary disconnection leading to a cessation of FSH. GnRH administration leads to a return of FSH secretion. FSH is subject to oestrogen feed-back from the gonads via the hypothalamic pituitary gonadal axis. Effects in femalesFSH stimulates the growth and recruitment of immature ovarian follicles in the ovary. In early (small) antral follicles, FSH is the major survival factor that rescues the small antral follicles (2–5 mm in diameter for humans) from apoptosis (programmed death of the somatic cells of the follicle and oocyte). In the luteal-follicle phase transition period the serum levels of progesterone and estrogen (primarily estradiol) decrease and no longer suppress the release of FSH, consequently FSH peaks at about day three (day one is the first day of menstrual flow). The cohort of small antral follicles is normally sufficient in number to produce enough Inhibin B to lower FSH serum levels. In addition, there is evidence that gonadotropin surge-attenuating factor produced by small follicles during the first half of the follicle phase also exerts a negative feedback on pulsatile luteinizing hormone (LH) secretion amplitude, thus allowing a more favorable environment for follicle growth and preventing premature luteinization.[9] As a woman nears perimenopause, the number of small antral follicles recruited in each cycle diminishes and consequently insufficient Inhibin B is produced to fully lower FSH and the serum level of FSH begins to rise. Eventually, the FSH level becomes so high that downregulation of FSH receptors occurs and by postmenopause any remaining small secondary follicles no longer have FSH nor LH receptors.[10] When the follicle matures and reaches 8–10 mm in diameter it starts to secrete significant amounts of estradiol. Normally in humans only one follicle becomes dominant and survives to grow to 18–30 mm in size and ovulate, the remaining follicles in the cohort undergo atresia. The sharp increase in estradiol production by the dominant follicle (possibly along with a decrease in gonadotrophin surge-attenuating factor) cause a positive effect on the hypothalamus and pituitary and rapid GnRH pulses occur and an LH surge results. The increase in serum estradiol levels cause a decrease in FSH production by inhibiting GnRH production in the hypothalamus.[11] The decrease in serum FSH level causes the smaller follicles in the current cohort to undergo atresia as they lack sufficient sensitivity to FSH to survive. Occasionally two follicles reach the 10 mm stage at the same time by chance and as both are equally sensitive to FSH both survive and grow in the low FSH environment and thus two ovulations can occur in one cycle possibly leading to non-identical (dizygotic) twins. Effects in malesFSH stimulates primary spermatocytes to undergo the first division of meiosis, to form secondary spermatocytes. FSH enhances the production of androgen-binding protein by the Sertoli cells of the testes by binding to FSH receptors on their basolateral membranes,[12] and is critical for the initiation of spermatogenesis. MeasurementFollicle stimulating hormone is typically measured in the early follicular phase of the menstrual cycle, typically day three to five, counted from last menstruation. At this time, the levels of estradiol (E2) and progesterone are at the lowest point of the menstrual cycle. FSH levels in this time is often called basal FSH levels, to distinguish from the increased levels when approaching ovulation. FSH is measured in International Units (IU). For Human Urinary FSH, one IU is defined as the amount of FSH that has an activity corresponding to 0.11388 mg of pure Human Urinary FSH.[13] For recombinant FSH, one IU corresponds to approximately 0.065 to 0.075 µg of a "fill-by-mass" product.[14] Disease states{{Unreferenced section|date=September 2010}}FSH levels are normally low during childhood and, in females, high after menopause. High FSH levelsThe most common reason for high serum FSH concentration is in a female who is undergoing or has recently undergone menopause. High levels of FSH indicate that the normal restricting feedback from the gonad is absent, leading to an unrestricted pituitary FSH production. If high FSH levels occur during the reproductive years, it is abnormal. Conditions with high FSH levels include:
Most of these conditions are associated with subfertility and/or infertility. Therefore, high FSH levels are an indication of subfertility and/or infertility. Low FSH levelsDiminished secretion of FSH can result in failure of gonadal function (hypogonadism). This condition is typically manifested in males as failure in production of normal numbers of sperm. In females, cessation of reproductive cycles is commonly observed. Conditions with very low FSH secretions are:
Isolated FSH deficiency due to mutations in the gene for β-subunit of FSH is rare with 13 cases reported in the literature up to 2019.[16] Use as therapy{{Further information|Gonadotropin preparations|Controlled ovarian hyperstimulation}}FSH is used commonly in infertility therapy, mainly for ovarian hyperstimulation as part of IVF. In some cases, it is used for reversal of anovulation as well. FSH is available mixed with LH activity in various menotropins including more purified forms of urinary gonadotropins such as Menopur, as well as without LH activity as recombinant FSH (Gonapure, Gonal F, Follistim, Follitropin alpha). Potential role in vascularization of solid tumorsElevated FSH receptor levels have been detected in the endothelia of tumor vasculature in a very wide range of solid tumors. FSH binding is thought to upregulate neovascularization via at least two mechanisms – one in the VEGF pathway, and the other VEGF independent – related to the development of umbilical vasculature when physiological. This presents possible use of FSH and FSH-receptor antagonists as an anti-tumor angiogenesis therapy (cf. avastin for current anti-VEGF approaches).[17] References1. ^{{cite web|url=https://www.webmd.com/women/follicle-stimulating-hormone#1|title=Follicle-Stimulating Hormone|website=WebMD}} 2. ^{{cite journal|last1=Pierce|first1=John G.|last2=Parsons|first2=Thomas F.|title=Glycoprotein Hormones: Structure and Function|journal=Annual Review of Biochemistry|date=July 1981|volume=50|issue=1|pages=465–495|doi=10.1146/annurev.bi.50.070181.002341|pmid=6267989}} 3. ^{{cite web|title=CGA glycoprotein hormones, alpha polypeptide [Homo sapiens (human)]|url=https://www.ncbi.nlm.nih.gov/gene/1081|website=NCBI|accessdate=2 January 2016}} 4. ^{{cite journal|last1=Jiang|first1=Xuliang|last2=Liu|first2=Heli|last3=Chen|first3=Xiaoyan|last4=Chen|first4=Po-Han|last5=Fischer|first5=David|last6=Sriraman|first6=Venkataraman|last7=Yu|first7=Henry N.|last8=Arkinstall|first8=Steve|last9=He|first9=Xiaolin|last-author-amp=y|date=2012-07-31|orig-year=Published online ahead of print 2012-07-16|editor1-last=Hendrickson|editor1-first=Wayne A.|editor1-link=Wayne Hendrickson|title=Structure of follicle-stimulating hormone in complex with the entire ectodomain of its receptor|journal=PNAS|volume=109|issue=31|pages=12491–12496|eissn=1091-6490|pmid=22802634|doi=10.1073/pnas.1206643109|doi-access=free|pmc=3411987|layurl= |laysource= |laydate= |quote= |ref= }} 5. ^{{OMIM|118850|CHORIONIC GONADOTROPIN, ALPHA CHAIN; CGA}} 6. ^{{cite journal|last1=Dalkin|first1=Alan C.|last2=Haisenleder|first2=Daniel J.|last3=Gilrain|first3=J. 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Hypothalamic Control of Pituitary FSH-Regulatory Proteins and Their Relationship to Changes in FSH Synthesis and Secretion|journal=Biology of Reproduction|publication-date=2012-06-01|volume=86|issue=6|at=article 171, p. 1-9|pmc=3386145|doi=10.1095/biolreprod.111.098442|doi-access=free|issn=0006-3363|pmid=22423050|eissn=1529-7268}} 8. ^{{cite journal|date=2014-03-25|orig-year=Last updated 2017-04-04|publication-date=2014-03-26|title=Reference ranges for estradiol, progesterone, luteinizing hormone and follicle-stimulating hormone during the menstrual cycle|journal=WikiJournal of Medicine|volume=1|issue=1|doi=10.15347/wjm/2014.001|doi-access=free|issn=2002-4436|last1=Häggström|first1=Mikael}} 9. ^{{cite journal|last1=Fowler|first1=Paul Alfred Francois|last2=Sorsa-Leslie|first2=Tarja Kristina|last3=Harris|first3=William Joseph|last4=Mason|first4=Helen D.|last-author-amp=y| title=Ovarian gonadotrophin surge-attenuating factor (GnSAF): where are we after 20 years of research?|journal=Reproduction|volume=126|issue=6|pages=689–99|date=2003-12-01|pmid=14748688|doi=10.1530/rep.0.1260689|doi-access=free|url=http://www.reproduction-online.org/content/126/6/689.full.pdf|issn=1470-1626|eissn=1741-7899|citeseerx=10.1.1.516.1420}} 10. ^{{cite journal | author = Vihko KK | title=Gonadotropins and ovarian gonadotropin receptors during the perimenopausal transition period | journal = Maturitas | volume = 23 | issue = Supplement | pages = S19–22 | date=May 1996 | pmid = 8865134 | doi=10.1016/s0378-5122(96)90009-2}} 11. ^{{cite book |vauthors=Dickerson LM, Shrader SP, Diaz VA |veditors=Wells BG, DiPiro JT, Talbert RL, Yee GC, Matzke GR | title = Pharmacotherapy: a pathophysiologic approach | edition = | language = | publisher = McGraw-Hill Medical | location = | year = 2008 | chapter = Chapter 8: Contraception | pages = 1313–28 | quote = | isbn = 978-0-07-147899-1 | oclc = | doi = | accessdate = }} 12. ^{{cite book |vauthors=Boulpaep EL, Boron WF | title = Medical physiology: a cellular and molecular approach | edition = | language = | publisher = Elsevier Saunders | location = St. Louis, Mo | year = 2005 | origyear = | pages = 1125 | quote = | isbn = 978-1-4160-2328-9 | oclc = | doi = | url = | accessdate = }} 13. ^World Health Organization Technical Report Series N0. 565. WHO Expert Committee on Biological Standardization. Twenty-sixth Report. World Health Organization. Geneva. 1975 14. ^{{cite journal | title = Gonadotropin preparations: Past, present, and future perspectives | journal = Fertility and Sterility | volume = 90 | issue = 5 Suppl | pages = S13–20 | year = 2008 | pmid = 19007609 | doi = 10.1016/j.fertnstert.2008.08.031 | last1 = Practice Committee Of American Society For Reproductive Medicine | first1 = Birmingham }} 15. ^{{cite journal|doi=10.1002/art.21436 | pmid=16320320 | volume=52 | issue=12 | title=Pituitary hormones and systemic lupus erythematosus | journal=Arthritis & Rheumatism | pages=3701–3712| year=2005 | last1=Li | first1=Jing | last2=May | first2=Warren | last3=McMurray | first3=Robert W. }} 16. ^Misgar RA, Wani AI, Bankura B, Bashir MI, Roy A, Das M (2019) FSH β-subunit mutations in two sisters: the first report from the Indian sub-continent and review of previous cases. Gynecol Endocrinol 2:1-4 17. ^{{cite journal |vauthors=Radu A, Pichon C, Camparo P, Antoine M, Allory Y, Couvelard A, Fromont G, Hai MT, Ghinea N | title = Expression of follicle-stimulating hormone receptor in tumor blood vessels | journal = N. Engl. J. Med. | volume = 363 | issue = 17 | pages = 1621–30 | date = October 2010 | pmid = 20961245 | doi = 10.1056/NEJMoa1001283 | url = }} External links{{commons category}}
9 : Recombinant proteins|Glycoproteins|Peptide hormones|Sex hormones|Human hormones|In vitro fertilisation|Hormones of the hypothalamus-pituitary-gonad axis|Anterior pituitary hormones|Human female endocrine system |
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