prolactin

(redirected from prolactin releasing factor (PRF))
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Related to prolactin releasing factor (PRF): Prolactin Inhibiting Hormone

prolactin

 [pro-lak´tin]
a hormone secreted by the anterior pituitary gland that promotes the growth of breast tissue and stimulates and sustains milk production in postpartum mammals, and shows luteotropic activity in certain mammals. Called also lactogenic hormone and mammotropin.

pro·lac·tin (PRL),

(prō-lak'tin), [MIM*176760]
A protein hormone of the anterior lobe of the hypophysis that stimulates the secretion of milk and possibly, during pregnancy, breast growth.
[pro- + L. lac, lact-, milk, + -in]

prolactin

/pro·lac·tin/ (-lak´tin) a hormone of the anterior pituitary that stimulates and sustains lactation in postpartum mammals, and shows luteotropic activity in certain mammals.

prolactin

(prō-lăk′tĭn)
n.
A pituitary hormone that stimulates and maintains the secretion of milk in mammals and also plays a role in metabolism and in modulation of the immune response.

prolactin (PRL)

[prōlak′tin]
Etymology: Gk, pro, before, lac, milk
a hormone produced and secreted into the bloodstream by the anterior pituitary gland. Prolactin stimulates the development and growth of the mammary glands after the glands have been prepared by estrogen, progesterone, thyroxine, insulin, growth hormone, glucocorticoids, and human placental lactogen. After parturition, prolactin, together with glucocorticoids, is essential for the initiation and maintenance of milk production. Prolactin synthesis and release from the pituitary are mediated by the central nervous system in response to suckling by the infant. When suckling or its mechanical equivalent ceases, prolactin secretion slows and milk production ceases. Prolactin has no known function in human males. Prolactin is similar to growth hormone in its chemical structure. Prolactin excess is seen with prolactin-secreting pituitary tumors in both sexes. Also called lactogenic hormone.

prolactin

A gonadotropic hormone encoded by PRL on chromosome 6p22.2-p21.3 and secreted by the anterior pituitary, which in females stimulates mammary gland growth and lactation after childbirth.

pro·lac·tin

(PRL) (prō-lak'tin)
A protein hormone of the anterior lobe of the hypophysis that stimulates the secretion of milk and possibly, during pregnancy, breast growth.
Compare: bioregulator
Synonym(s): lactogenic hormone.
[pro- + L. lac,lact-, milk, + -in]

prolactin

One of the PITUITARY GLAND hormones. Prolactin stimulates the development and growth of the breasts (mammary glands) and helps to start and maintain milk production at the end of pregnancy.

prolactin

see LUTEOTROPHIC HORMONE.

Prolactin

A hormone that helps the breast prepare for milk production during pregnancy.
Mentioned in: Pituitary Dwarfism

pro·lac·tin

(prō-lak'tin) [MIM*176760]
Protein hormone of anterior lobe of hypophysis that stimulates secretion of milk and possibly, during pregnancy, breast growth.
[pro- + L. lac,lact-, milk, + -in]

prolactin,

prolactin

a hormone secreted by the anterior pituitary that promotes the growth of mammary tissue and stimulates and sustains milk production in postpartum mammals, and shows luteotropic activity in certain mammals. Promotes the secretion of milk in the crop of pigeons and doves. Called also lactogenic hormone, luteotropic hormone, LTH and mammotropin. It is identical with luteotropin.

prolactin inhibitory factor (PIF)
probably the catecholamine dopamine, released in the hypothalamus, carried to the anterior pituitary via the hypophyseal portal system, and inhibits the secretion of prolactin.
prolactin releasing factor (PRF)
appears to be released from the hypothalamus in a pulsatile fashion and it is the fluctuation in PRF that regulates the circulating level of prolactin.
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