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Dopamine acts on pituitary lactotroph D 2 receptors to inhibit prolactin secretion while other peptides and hormones, such as thyrotropin releasing hormone (TRH), stimulate prolactin secretion. [3] As a result, hyperprolactinemia may be caused by disinhibition (e.g., compression of the pituitary stalk or reduced dopamine levels) or excess ...
Prolactin has a wide variety of effects. It stimulates the mammary glands to produce milk (): increased serum concentrations of prolactin during pregnancy cause enlargement of the mammary glands and prepare for milk production, which normally starts when levels of progesterone fall by the end of pregnancy and a suckling stimulus is present.
Estrogen, progesterone, and prolactin, as well as GH/IGF-1, produce their effects on breast development by modulating the local expression in breast tissue of an assortment of autocrine and paracrine growth factors, [25] [44] [62] [63] [64] including IGF-1, IGF-2, amphiregulin, [65] EGF, FGF, hepatocyte growth factor (HGF), [66] tumor necrosis factor α (TNF-α), tumor necrosis factor β (TNF ...
A prolactin cell (also known as a lactotropic cell, epsilon acidophil, lactotrope, lactotroph, mammatroph, mammotroph) is a cell in the anterior pituitary which produces prolactin (a peptide hormone) in response to hormonal signals including dopamine (which is inhibitory), thyrotropin-releasing hormone and estrogen (especially during pregnancy), which are stimulatory.
This is in accordance with higher prolactin levels being associated with increased breast cancer risk. [32] [33] In puberty induction in hypogonadal girls and in feminizing hormone therapy in transgender women, as well as hormonal breast enhancement in women with breast hypoplasia or small breasts, mammoplasia is a desired effect. [34] [35] [36 ...
Prolactin-releasing hormone, also known as PRLH, is a hypothetical human hormone or hormone releasing factor.Existence of this factor has been hypothesized as prolactin is the only currently known hormone for which almost exclusively negative regulating factors are known (such as dopamine, leukemia inhibitory factor, some prostaglandins) but few stimulating factor.
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