The diversity of sex steroid action: regulation of metabolism by estrogen signaling.
- Estrogen is a major effector for the regulation of energy balance, body weight, fat distribution, and appetite (in mice )
- Ovariectomized mice display an increase in food consumption, decreased running wheel activities, and increased fat mass, which can be reversed with estrogen replacement
- Energy homeostasis and feeding behavior in the hypothalamus also follows the menstrual cycle, and food intake in women varies across the cycle with lowest daily food intake during the peri-ovulatory period when estrogen levels are maximum
- After puberty, estrogen modulates leptin synthesis and secretion
- In addition, raised levels of estrogens have been associated with increased leptin sensitivity in the brain
- Premenopausal women are more insulin sensitive with associated improved glucose tolerance, are more resistant to develop IR compared with men, and display increased expression of GLUT4
- Importantly, men with aromatase deficiency, who cannot synthesize estrogen hormones, display impairment in glucose metabolism and IR
- female mice have increased lipogenic capacities in adipocytes compared with male mice
- When circulating levels of estrogen are raised above the physiological range, adipose tissue metabolism is altered resulting in reduced lipogenic rates and fat depot size.
- This is further supported by epidemiological observations that serum triglyceride levels increase in postmenopausal women and that the level of LPL activity is reduced by estrogen treatment
- 17β-estradiol treatment suppressed the expression of lipogenic genes, i.e. fatty acid synthase (Fasn), stearoyl-coenzyme A desaturase 1 (Scd1), and glycerol-3-phosphate acyltransferase (Gpam), in livers of leptin-deficient Ob/Ob mice
- 17β-estradiol suppresses lipogenesis and TG accumulation in adipose tissue and liver in high-fat diet (HFD) fed and leptin-deficient female mice
Sounds about right.
ReplyDeleteBut remember: estrogen kills old women!