Navigation Links
Weizmann Institute scientists discover: Antioxidants cause fertility problems in females

Antioxidants are sold over the counter everywhere. They're added to food, drink and face cream. But according to Prof. Nava Dekel of the Biological Regulation Department, we still don't have a complete understanding of how they act in our bodies. New research by Dekel and her team, recently published in the Proceedings of the National Academy of Sciences USA (PNAS), has revealed a possible unexpected side effect of antioxidants: They might cause fertility problems in females.

Common antioxidants include vitamins C and E. These work by eliminating molecules called reactive oxygen species that are produced naturally in the body. Stress can cause these chemically active molecules to be overproduced; in large amounts they damage cells indiscriminately. By neutralizing these potentially harmful substances, antioxidants may, theoretically, improve health and slow down the aging process.

But when Dekel and her research team including her former and present Ph.D. students Dr. Ketty Shkolnik and Ari Tadmor applied antioxidants to the ovaries of female mice, the results were surprising: ovulation levels dropped precipitously. That is, very few eggs were released from the ovarian follicles to reach the site of fertilization, compared to those in untreated ovaries.

To understand what lies behind these initial findings, the team asked whether it is possible that the process of ovulation might rely on the very 'harmful' substances destroyed by antioxidants reactive oxygen species.

Further testing in mice showed that this is, indeed, the case. In one experiment, for instance, Dekel and her team treated some ovarian follicles with luteinizing hormone, the physiological trigger for ovulation, and others with hydrogen peroxide, a reactive oxygen species. The results showed hydrogen peroxide fully mimicked the effect of the ovulation-inducing hormone. This implies that reactive oxygen species that are produced in response to luteinizing hormone serve, in turn, as mediators for this physiological stimulus leading to ovulation.

Among other things, these results help fill in a picture that has begun to emerge in recent years of fertility and conception, in which it appears that these processes share a number of common mechanisms with inflammation. It makes sense, says Dekel, that substances which prevent inflammation in other parts of the body might also get in the way of normal ovulation, and so more caution should be taken when administering such substances.

Much of Dekel's research has focused on fertility -- her previous results are already helping some women become pregnant. Ironically, the new study has implications for those seeking the opposite effect. Dekel: 'On the one hand, these findings could prove useful to women who are having trouble getting pregnant. On the other, further studies might show that certain antioxidants might be effective means of birth control that could be safer than today's hormone-based prevention.'

Dekel and her team are now planning further studies to investigate the exact mechanics of this step in ovulation and to examine its effect on mice when administered in either food or drink. In addition, they plan to collect data on the possible link between females being administered antioxidant supplements and the difficulty to conceive.


Contact: Yivsam Azgad
Weizmann Institute of Science

Related medicine news :

1. Cancer Research Institute launches Cancer Vaccine Acceleration Fund
2. CRN reacts to Institute of Medicine DRI recommendations for vitamin D
3. Richard Call Family Endowed Chair honors Dr. Yves DeClerck at the Saban Research Institute Symposium
4. National Cancer Institute awards nearly $4 million to University of New Mexico Cancer Center
5. Massachusetts Institute of Technology IDs new cancer drug target
6. 20th public data release by Allen Institute for Brain Science
7. Neuroprosthetics symposium to be webcast live from Worcester Polytechnic Institute Nov. 3
8. Inhaled steroids increase diabetes risk, say Lady Davis Institute researchers
9. Ming Hsieh donates $50 million to establish a USC institute for research on engineering medicine for cancer
10. Feinstein Institute to share $5M US Department of Defense grant
11. National Institutes of Health awards $1.2 million to GSU for collaborative study on discharge decisions at hospitals
Post Your Comments:
(Date:6/26/2016)... ... June 27, 2016 , ... Quality metrics are proliferating ... many ways they remain in the eye of the beholder, according to experts who ... of The American Journal of Managed Care. For the full issue, click here ...
(Date:6/26/2016)... ... June 26, 2016 , ... Pixel Film Studios Released ProSlice Levels, ... editors can give their videos a whole new perspective by using the title ... Pixel Film Studios. , ProSlice Levels contains over 30 Different presets to choose ...
(Date:6/26/2016)... ... 2016 , ... Brent Kasmer, a legally blind and certified personal trainer is helping to develop ... The fitness app plans to fix the two major problems leading the fitness industry today:, ... all type program , They don’t eliminate all the reasons people quit their ...
(Date:6/25/2016)... Washington, D.C. (PRWEB) , ... June 25, 2016 ... ... will discuss health policy issues and applications at AcademyHealth’s Annual Research Meeting June ... share their work on several important health care topics including advance care planning, ...
(Date:6/25/2016)... ... June 25, 2016 , ... The temporary closing of Bruton Memorial Library on June ... , brings up a new, often overlooked aspect of head lice: the parasite’s ability to ... is not a common occurrence, but a necessary one in the event that lice have ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... WAYNE, Pa. , June 23, 2016 ... provider, will launch its next generation clinical outcomes platform, Bracket ... DIA Meeting held on June 26 – 30, 2016 in ... 6.0, the first electronic Clinical Outcome Assessment product of its ... DIA Booth #715. Bracket eCOA 6.0 is a ...
(Date:6/23/2016)... , June 23, 2016 Revolutionary ... Oticon , industry leaders in advanced audiology ... of Oticon Opn ™, the world,s first internet ... possibilities for IoT devices.      (Photo: ... introduces a number of ,world firsts,: , ...
(Date:6/23/2016)... FRANKLIN, Tenn. , June 23, 2016 ... for automating, integrating and transforming the patient ... launch of several innovative new products and ... depth of its revenue cycle offerings. These ... establish more efficient workflows, remain compliant in ...
Breaking Medicine Technology: