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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.
In mammals, prolactin is associated with milk production; in fish it is thought to be related to the control of water and salt balance. Prolactin also acts in a cytokine-like manner and as an important regulator of the immune system. It has important cell cycle-related functions as a growth-, differentiating- and anti-apoptotic factor.
The prolactin receptor (PRLR) is a type I cytokine receptor [1] encoded in humans by the PRLR gene on chromosome 5p13-14. It is the receptor for prolactin (PRL). The PRLR can also bind to and be activated by growth hormone (GH) and human placental lactogen (hPL).
Prolactin-releasing peptide (PrRP) is a peptide hormone that in humans is encoded by the PRLH gene. [5] PrRP stimulates prolactin (PRL) release and regulates the expression of prolactin through binding to the prolactin-releasing peptide receptor (GPR10).
Thyrotropin-releasing hormone (TRH) is a hypophysiotropic hormone produced by neurons in the hypothalamus that stimulates the release of thyroid-stimulating hormone (TSH) and prolactin from the anterior pituitary. TRH has been used clinically for the treatment of spinocerebellar degeneration and disturbance of consciousness in humans. [1]
The most common complex found in blood consists of prolactin and immunoglobulin G (IgG). [1] While the free prolactin hormone is active, prolactin in the macroprolactin complex does not have any biological activity in the body and is considered benign. [2] However, macroprolactin is detected by all Laboratory tests that measure prolactin in ...
Lyn is activated by stimulation of B-cell receptor, which leads to the recruitment and phosphorylation of Zap70-related nRTK, Syk. Another nRTK, Btk, is also involved in signaling mediated by the B-cell receptor. Mutations in the Btk gene are responsible for X-linked agammaglobulinemia, [2] [3] a disease characterized by the lack of mature B-cells.
Folliculostellate (FS) cells are asserted to be of sustentacular (support) function due to their positioning alongside the endocrine (hormone-secreting) cells of the pituitary gland, implying an either mechanical or chemical support – by forming structural support around the endocrine cells or releasing growth factors and cytokines (cell ...