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Prolactin (PRL), also known as lactotropin and mammotropin, is a protein best known for its role in enabling mammals to produce milk. It is influential in over 300 separate processes in various vertebrates, including humans. [5] Prolactin is secreted from the pituitary gland in response to eating, mating, estrogen treatment, ovulation and ...
Despite the increase in cortisol, the pregnant mom does not exhibit Cushing syndrome or symptoms of high cortisol. One theory is that high progesterone levels act as an antagonist to the cortisol. The adrenal gland also produces more aldosterone, leading to an eight-fold increase in aldosterone. [5]
Together with estrogen, progesterone, insulin-like growth factor-1 (IGF-1), and hormones from the placenta, prolactin stimulates the proliferation of breast alveolar elements during pregnancy. However, lactation is inhibited during pregnancy due to elevated estrogen levels. [ 1 ]
Across multiple species and in some cases across sexes, there is evidence for the phylogenetic conservation of parental hormones. These include the relationships between the hormones estrogen, progesterone, prolactin, and oxytocin. In males across species, including humans, increased prolactin levels are associated with fatherhood.
Estrogen and progesterone cause the secretion of high levels of prolactin from the anterior pituitary, [32] [33] which reach levels as high as 20 times greater than normal menstrual cycle levels. [31] IGF-1 and IGF-2 levels also increase dramatically during pregnancy, due to secretion of placental growth hormone (PGH). [34]
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.
An estrogen-dependent condition can be that relating to the differentiation in the steroid sex hormone that is associated with the female reproductive system and sex characteristics. [1] These conditions can fall under the umbrella of hypoestrogenism, hyperestrogenim, or any sensitivity to the presence of estrogen in the body.
Estrogen promotes the development of breast cancers that have estrogen receptor (ER) by stimulating the proliferation and survival of breast cancer cells. [39] Estrogen receptor (ER) is a significant indicator for predicting outcomes and guiding treatment decisions, and it is found in around 75% of breast cancers. [ 39 ]