A protein hormone of the anterior lobe of the hypophysis that stimulates the secretion of milk and possibly, during pregnancy, breast growth. SYN: galactopoietic hormone, lactation hormone, lactogenic hormone, lactotropin, mammotropic factor, mammotropic hormone. [pro- + L. lac, lact-, milk, + -in]

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pro·lac·tin prō-'lak-tən n a protein hormone of the adenohypophysis of the pituitary gland that induces and maintains lactation in the postpartum mammalian female abbr. PRL called also luteotropic hormone, luteotropin, mammotropin

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a hormone, synthesized and stored in the anterior pituitary gland, that stimulates milk production after childbirth and also stimulates production of progesterone by the corpus luteum in the ovary. In both sexes excessive secretion of prolactin gives rise to abnormal production of milk (galactorrhoea).

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pro·lac·tin (PRL) (Prl) (pro-lakґtin) [pro- + L. lac milk] an anterior pituitary hormone with 198 amino acids, molecular weight 23,000, which stimulates and sustains lactation in postpartum mammals after the mammary glands have been prepared by other hormones such as estrogens, progesterone, growth hormone, corticosteroids, and insulin. It also stimulates formation of “milk” in the crop sac of birds such as pigeons and doves (an action formerly used for bioassay), is luteotropic in certain mammals, and has many other effects, including essential roles in the maintenance of immune system functions. Called also lactogen, luteotropin, and lactogenic or luteotropic hormone.

Medical dictionary. 2011.

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  • Prolactin — Prolactin, luteotropes Hormon, lactotropes Hormon, LTH, in der Adenohypophyse gebildetes, in seiner Struktur dem Somatotropin ähnelndes Proteinhormon, das bei Säugern die Progesteronbildung im Gelbkörper und während der Schwangerschaft die… …   Deutsch wörterbuch der biologie

  • prolactin — 1932, from PRO (Cf. pro ) + stem of LACTATION (Cf. lactation) + chemical suffix IN (Cf. in) (2) …   Etymology dictionary

  • prolactin — [prō lak′tin] n. [ PRO 1 + LACT(O) + IN1] a pituitary hormone stimulating milk secretion in mammals and secretion by the crop gland in certain birds …   English World dictionary

  • Prolactin — Protein Name=Prolactin Caption= Symbol=PRL AltSymbols= HGNCid=9445 Chromosome=6 Arm=p Band=22.2 LocusSupplementaryData= p21.3 ECnumber= OMIM=176760 EntrezGene=5617 RefSeq=NM 000948 UniProt=P01236Prolactin (PRL) or Luteotropic hormone (LTH) is a… …   Wikipedia

  • prolactin — Pituitary lactogenic hormone (23 kD), synthesized on ER bound ribosomes as preprolactin that has an N terminal signal peptide that is cleaved from the mature form. The conversion of preprolactin to prolactin has been much used as an assay for… …   Dictionary of molecular biology

  • prolactin — /proh lak tin/, n. Biochem. an anterior pituitary polypeptide hormone that stimulates lactation by the mammary glands at parturition in mammals, the activity of the crop in birds, and in some mammalian species the production of progesterone by… …   Universalium

  • prolactin — lactogenic hormone; = luteotrophic hormone; = luteotrophin; n. a hormone, synthesized and stored in the anterior pituitary gland, that stimulates milk production after childbirth and also stimulates production of progesterone by the corpus luteum …   The new mediacal dictionary

  • prolactin — prolaktinas statusas T sritis chemija apibrėžtis Baltyminis hipofizės hormonas. atitikmenys: angl. lactotropin; prolactin rus. пролактин …   Chemijos terminų aiškinamasis žodynas

  • prolactin — A hormone that is made by the pituitary gland (a pea sized organ in the center of the brain). Prolactin causes a woman’s breasts to make milk during and after pregnancy, and has many other effects in the body …   English dictionary of cancer terms

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