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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.
Meanwhile, breastfeeding quality within the first 48 hours of birth, indicated by signs of successful lactation such as nipple discomfort, is inversely correlated with DOL. [9] This association can be attributed to insufficient nipple stimulation and breast emptying for stimulating lactogenesis II, as a result of low breastfeeding quality. [9]
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.
Hypoprolactinemia can result from autoimmune disease, [2] hypopituitarism, [1] growth hormone deficiency, [2] hypothyroidism, [2] excessive dopamine action in the tuberoinfundibular pathway and/or the anterior pituitary, and ingestion of drugs that activate the D 2 receptor, such as direct D 2 receptor agonists like bromocriptine and pergolide, and indirect D 2 receptor activators like ...
In breastfeeding women, low milk supply, ... and often do not grow during pregnancy. [3] ... High levels of prolactin are necessary for lactation, ...
During pregnancy, the production of prolactin by the mother increases steadily, starting at 6–8 weeks of gestation and continuing until the end of the pregnancy. [32] Prolactin levels in the human fetal circulation see a gradual increase from around 30 weeks of gestation until birth. [32] Prolactin is released into milk at amounts consistent ...
Physiologic amenorrhea is present before menarche, during pregnancy and breastfeeding, and after menopause. [3] Breastfeeding or lactational amenorrhea is also a common cause of secondary amenorrhoea. [26] Lactational amenorrhea is due to the presence of elevated prolactin and low levels of LH, which suppress ovarian hormone secretion. [27]
During pregnancy, the level of prolactin rises to trigger the development of mammary tissue in the breast to prepare it for milk supply. [17] Yet, due to high levels of progesterone and oestrogen, which are female hormones released from the placenta, milk production is prohibited until the removal of the placenta after labour.