[Lotus]

Btw,

Estrogen, 17-beta-estradiol binds to both the ER alpha and ER beta receptors but not to androgen, progestin, or thyroid receptors. Each receptor version may turn on and off different responses in different cells in different parts of the body. For instance, ER alpha, promotes tissue growth and is found in greater amounts in the uterus, pituitary gland, and epididymis (the male sperm storing structure). ER alpha stimulates certain breast cancer cells to grow in response to estrogen hormones. The other version, ER beta, inhibits growth (possibly suppressing cancer) and prevails in the ovary and prostate. It can act like a dimmer switch for ER alpha, turning down its growth-stimulating effect.


Binding produces two distinct signaling routines: either slower via gene expression (hours to days) or very rapidly via molecular exchanges, or cascades (seconds to minutes). In both cases, the cell responds to the signals by manipulating proteins or building new ones. The affected workhorse proteins carry out specialized functions, such as controlling cell processes, building cells and tissues, or carting messages elsewhere within the cell or around the body.
14-02-2015 04:14 PM