Search results
Results From The WOW.Com Content Network
Prolactin is crucial for milk production during pregnancy and lactation. 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 ...
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.
High levels of prolactin during pregnancy and breastfeeding also increase insulin resistance, increase growth factor levels (IGF-1) and modify lipid metabolism in preparation for breastfeeding. During lactation, prolactin is the main factor maintaining tight junctions of the ductal epithelium and regulating milk production through osmotic balance.
Changes in breast size during pregnancy may be related to the sex of the infant, as mothers of female infants have greater changes in breast size than mothers of male infants. [ 14 ] Many people and even medical professionals mistakenly think that breastfeeding causes the breasts to sag (referred to as ptosis ).
It modifies the metabolic state of the mother during pregnancy to facilitate energy supply to the fetus. hPL has anti-insulin properties. hPL is a hormone secreted by the syncytiotrophoblast during pregnancy. Like human growth hormone, hPL is encoded by genes on chromosome 17q22-24. It was identified in 1963. [2]
Its levels increase during pregnancy to prepare the breasts for milk production and remain high after childbirth to continue supporting breastfeeding. Issues related to abnormal lactation, such as inadequate milk supply or galactorrhea, an excessive milk flow not linked to childbirth, are also explored.
Male mammals of many species have been observed to lactate under unusual or pathogenic conditions, such as extreme stress, castration, and exposure to phytoestrogens, or pituitary tumors. Therefore, it is hypothesized that while most male mammals could easily develop the ability to lactate, there is no selective advantage to male lactation.
[10]: 18–21 [23] [24] While prolactin is the predominant hormone in milk production, progesterone, which is at high levels during pregnancy, blocks the prolactin receptors in the breast, thus inhibiting milk from "coming in" during pregnancy. [10]: 18–21 [22] [25]