Navigation Links
Sperm may be harmed by exposure to BPA, study suggests

ANN ARBOR, Mich.---In one of the first human studies of its kind, researchers have found that urinary concentrations of the controversial chemical Bisphenol A, or BPA, may be related to decreased sperm quality and sperm concentration.

However, the researchers are quick to point out that these results are preliminary and more study is needed. Several studies have documented adverse effects of BPA on semen in rodents, but none are known to have reported similar relationships in humans.

BPA is a common chemical that's stirred much controversy in the media lately over its safety. Critics say that BPA mimics the body's own hormones and may lead to negative health effects. BPA is most commonly used to make plastics and epoxy resins used in food and beverage cans, and people are exposed primarily through diet, although other routes are possible. More than 6 billion pounds of BPA are produced annually.

The new study suggests that more research should focus on BPA and health effects in adults, says John Meeker, assistant professor of Environmental Health Sciences at the University of Michigan School of Public Health.

Meeker is the lead author on the study, along with Russ Hauser, the Frederick Lee Hisaw Professor of Reproductive Physiology at Harvard School of Public Health. Colleagues at Massachusetts General Hospital and the U.S. Centers for Disease Control and Prevention also contributed to the research.

"Much of the focus for BPA is on the exposures in utero or in early life, which is of course extremely important, but this suggests exposure may also be a concern for adults," Meeker said. "Research should focus on impacts of exposure throughout multiple life stages."

Meeker and Hauser recruited 190 men through a fertility clinic. All gave spot urine samples and sperm samples the same day. Subsequently, 78 of the men gave one or two additional urine samples a month apart. Researchers detected BPA in 89 percent of the urine samples.

Researchers measured sperm concentration, sperm motility, sperm shape and DNA damage in the sperm cell.

"We found that if we compare somebody in the top quartile of exposure with the lowest quartile of exposure, sperm concentration was on average about 23 percent lower in men with the highest BPA," Meeker said.

Results also suggested a 10 percent increase in sperm DNA damage.

The results are consistent with a previous study by Meeker and Hauser suggesting that certain hormones, specifically FSH (follicle-stimulating hormone) and Inhibin B, are elevated or decreased in relation to BPA, respectively, a pattern consistent with low sperm production and development.

Meeker stressed that further study is necessary due to the study's relatively small sample size and design.

"The study from which these data came is currently in progress," Hauser said. "With a larger sample size and enhanced study design, we will be able to more definitively investigate this preliminary association in the near future."


Contact: Laura Bailey
University of Michigan

Related biology news :

1. Yale researchers develop test to identify best sperm
2. UT Southwestern researchers use novel sperm stem-cell technique to produce genetically modified rats
3. Females shut down male-male sperm competition in leafcutter ants
4. Molecular study could push back angiosperm origins
5. MMS and NOAA scientists study prey of Gulf of Mexico sperm whales
6. ESHREs workshop on freezing of human sperm, eggs and embryos in Athens
7. Spread your sperm the smart way
8. The egg makes sure that sperm dont get too old
9. CSHL scientists discover how companion cells to sperm protect them from genetic damage
10. The more promiscuous the female, the speedier the sperm
11. Proteins in sperm unlock understanding of male infertility says new study
Post Your Comments:
(Date:5/20/2016)... 20, 2016  VoiceIt is excited to announce ... By working together, VoiceIt and VoicePass ... and VoicePass take slightly different approaches to voice ... security and usability. ... new partnership. "This marketing and technology ...
(Date:5/12/2016)... May 12, 2016 , a ... the overview results from the Q1 wave of its ... wave was consumers, receptivity to a program where they ... a health insurance company. "We were surprised ... says Michael LaColla , CEO of Troubadour Research, ...
(Date:5/3/2016)... Lithuania , May 3, 2016  Neurotechnology, ... released the MegaMatcher Automated Biometric Identification System ... of large-scale multi-biometric projects. MegaMatcher ABIS can process ... accuracy using any combination of fingerprint, face or ... MegaMatcher SDK and MegaMatcher Accelerator ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... CLEVELAND , June 27, 2016  Global ... average 4.6 percent through 2020 to $7.2 billion.  ... (food and beverages, cleaning products, biofuel production, animal ... and biotechnology, diagnostics, and biocatalysts). Food and beverages ... gains driven by increasing consumption of products containing ...
(Date:6/27/2016)... , ... June 27, 2016 , ... ... their findings on what they believe could be a new and helpful biomarker ... new research. Click here to read it now. , Biomarkers are ...
(Date:6/27/2016)... Chapel Hill, N.C. (PRWEB) , ... June 27, ... ... of U.S. commercial operations for Amgen, will join the faculty of the ... will serve as adjunct professor of strategy and entrepreneurship at UNC Kenan-Flagler, with ...
(Date:6/24/2016)... discussions on a range of subjects including policies, debt and ... Poloz. Speaking at a lecture to the Canadian ... to the country,s inflation target, which is set by both ... "In certain areas there needs to be ... why not sit down and address strategy together?" ...
Breaking Biology Technology: