Liver plays key role in maintaining fertility
February 2nd, 2011 - 12:16 pm ICT by ANIWashington, Feb 2 (ANI): A University of Milan study has suggested that estrogen receptors in the liver are critical for maintaining fertility.
Moreover, the expression of those receptors is under the control of dietary amino acids, the building blocks of proteins.
The findings in mice may have important implications for some forms of infertility and for metabolic changes that come with menopause, said the researchers.
“This is the first time it has been demonstrated how important the liver is in fertility. The idea that diet may have an impact on fertility isn’t totally new of course, but this explains how diet, and especially a diet poor in protein, can have a direct influence,” said Adriana Maggi of the University of Milan in Italy.
Maggi’s team got interested in the liver receptors quite by accident. In studies of mice, “we saw that the organ that always had the highest activation of estrogen receptor was the liver,” she said.
Initially they thought it must be a mistake and disregarded it, but over time they began to think maybe the mice were telling them something.
The researchers have now reported that the expression of those estrogen receptors depends on dietary amino acids.
Mice on a calorie-restricted diet and those lacking estrogen receptors in their livers showed a decline in an important hormone known as IGF-1. Blood levels of the hormone dropped to levels inadequate for the correct growth of the lining of their uteruses and normal progression of the estrous cycle, they show.
When the calorie-restricted mice were given more protein, their reproductive cycles got back on track. Dietary fats and carbohydrates, on the other hand, had no effect on the estrogen receptors or fertility.
The researchers have suggested that this connection between amino acids, estrogen receptor signaling in liver, and reproductive functions may have clinical implications.
The results also provide new clues for understanding the increased risk of metabolic and inflammatory disease in menopausal women.
The findings have been published in the journal Cell Metabolism, a Cell Press publication. (ANI)
- Female sex hormone regulates weight - Oct 20, 2011
- Right balance of proteins, not cutting calories, 'key' to longevity - Dec 03, 2009
- Estrogen helps women pile on pounds - Oct 06, 2011
- Low-carb diets better for easing weight: Study - Dec 13, 2011
- Obesity begins in brain, say US researchers - Feb 04, 2012
- A missing link from obesity to infertility discovered - Sep 12, 2010
- Heart hormone helps shape fat metabolism - Feb 07, 2012
- Protein, not sugar, key to keeping us alert and thin - Nov 17, 2011
- How dietary restrictions are beneficial for healthy aging - Dec 05, 2009
- Successful dieting may be all in the mind - Jul 07, 2010
- Low-calorie diet tied to bowel disease deaths - Mar 21, 2012
- Aging-related protein holds breast cancer clues - Jan 28, 2011
- Childhood obesity could erode fertility later - Aug 01, 2012
- Birch bark ingredient has an array of metabolic benefits - Jan 05, 2011
- Apple compound may help burn fat, reduce obesity - Jun 21, 2012
Tags: blood levels, building blocks of proteins, calorie restricted diet, clinical implications, dietary amino acids, dietary fats, estrogen receptor, estrogen receptors, estrous cycle, feb 2, fertility, infertility, key role, livers, maggi, metabolic changes, reproductive cycles, reproductive functions, university of milan, uteruses