Prolactin (PRL) exhibits many physiological effects on women. PRL is also known as luteotropic (LTH) hormone and is regulated by the PRL gene. Perhaps the most well-known effects of prolactin in women are on the mammary gland, where they regulate the production of milk, or lactation. PRL is also partly responsible for development of mammary tissue during adolescence and pregnancy. It is considered a multi-function hormone, meaning it has many other more subtle effects on the body, including in the areas of ovulation and the maintenance of other fertility mechanisms.
The PRL gene stimulates the production of PRL from lactotrophs located in the anterior pituitary region inside the brain. In addition, it has been discovered that other tissues secrete the hormone on their own. For example, the uterus produces its own prolactin while it is maintaining pregnancy, and immune cells also produce it when they are stimulated. Most cells within the human body contain PRL receptors, and for this reason, researchers believe that the effects of prolactin in women are more numerous than originally thought. The phenomenon known as “nesting,” which is a behavioral change exhibited by a woman as she gets close to delivering a baby, is believed to be caused by a rise in PRL toward the end of pregnancy.
The effect of prolactin in women who are getting ready to breastfeed a child is paramount. If there is a dysfunction within the system, a woman will be unable to physiologically produce enough milk to nourish a baby. There are two major roles that PRL plays in the production of milk; the first role is increasing the lobuloalveolar growth of mammary tissues. The growth of alveoli, which are clusters of small cells inside the breast, enable the tissue to prepare for the storage of lactate. After birth, PRL stimulates lactogenesis, or the production of milk and the letdown of milk for expression.
Studies have shown the importance of PRL in the production of milk. A study done on mice confirmed a link between the PRL gene and the inability of female mice to produce enough milk after pregnancy. The mice were genetically altered to possess two deletion PLR genes. These mice, while still able to produce prolactin from other sources, were unable to produce a substantial amount of milk after giving birth. The effects of prolactin in women with cases of infertility are being studied, which may lead to alternative fertility treatments.
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feruze
Post 4 |
@fify-- That makes sense. Since prolactin plays a role in lactation, it's really high when women are making breast milk. I think it's not possible to ovulate and conceive during lactation. The reason must be high prolactin levels.
I wonder if prolactin has anything to do with miscarriage? My sister-in-law has had two miscarriages and I remember her saying something about her prolactin levels.
I've also heard that low or elevated prolactin levels causes an increase or decrease in body hair. So I guess prolactin has too do with body hair production as well. |
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ElizaBennett
Post 3 |
@fify - I have never had a problem with high prolactin when I'm not pregnant or breastfeeding, but while nursing I have definitely noticed how prolactin levels in women affect your system.
The drop in your estrogen levels is probably the most noticeable. It's why lactating women usually don't get their period back for several months, or even over a year. It also causes a loss of bone density, but that's temporary - when you are done breastfeeding, your bones regain their lost density (possibly even stronger than they were before). I can see how the loss of bone density, in particular, would be a problem if you had abnormally high levels of prolactin outside pregnancy/nursing. And doesn't estrogen protect against heart disease as well?
Vaginal dryness and painful intercourse are other side effects of low estrogen that many women will notice. I think it's important to just be patient with yourself and give yourself time - knowing the hormonal causes of what you're going through, I find, can really help. |
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fify
Post 2 |
@turkay1-- Yea, I would agree with that. That's why if a woman is having a problem with fertility, prolactin is one of the hormones that they do a test for because it has a direct affect on fertility health.
I also used to have high prolactin levels. I didn't have an irregular period, but my breasts were leaking milk even though I was not pregnant. My doctor prescribed a medication that lowered my prolactin to normal. I'm still taking it.
At that time, my doctor had also asked me if I had been trying to conceive since I was newly married. Apparently, having high prolactin affects the production of estrogen which is necessary to conceive.
I think doctors are aware of how important the prolactin hormone is and always test for it in addition to progesterone, estrogen, androgen and so forth when there is a reproductive issue. |
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turkay1
Post 1 |
I completely agree that prolactin is very important in women, it seems to affect the entire reproductive system and how it functions. I've had very high prolactin counts for the past couple of years. I had gone to the doctor because of irregular periods and found out then that my prolactin levels are much higher than normal.
Since then, I've also been dealing with low libidio (basically none) and headaches more than usual. My doctor feels that these are also side effects of having high prolactin. I don't know what's causing my prolactin levels to rise, but I've definitely learned in these several years that prolactin is very important in how the reproduction system functions.
I think that higher or lower than usual amount of prolactin messes with the female reproductive hormones. Is anyone else suffering from this? Would you agree with this statement? |
