HOME >> BIOLOGY >> NEWS
PCB exposure is bad news for the female sex drive

Female rats that are exposed to PCBs in the womb are reluctant to mate as adults. This raises the possibility that similar chemical contaminants can cause low sex drives in women.

PCBs are a group of stable chemical additives once widely used in the production of pesticides, lubricants and plastics. Their use was banned in many countries after it became clear that some PCBs mimic hormones. But there is strong evidence that PCBs are still widespread in the environment. The food crisis that struck Belgium in June was partly caused by PCB contamination of poultry and dairy produce.

Zoologists Yu-Wen Chung and Lynwood Clemens of Michigan State University in East Lansing tested the effects on rats of two commercial PCBs, Aroclor 1221 and 1254. A1221 is known to mimic oestrogen and A1254 is thought to reduce dopamine levels in the brain.

They injected 40 pregnant rats with either pure sesame oil or a mixture of oil and the PCBs, first on day 14 of gestation, then on the day of the pup's birth and again 10 days later while the pups were suckling. Two months later, Chung and Clemens looked at the sexual behaviour of the female offspring.

"Female rats normally adopt a stereotypical posture when copulating, raising their back and hindquarters to help the male mate," says Chung. But rats exposed to A1221 did not indulge in this sexual come-on nearly as often as rats exposed to A1254 or those that had not been exposed to either PCB.

A second test paired female and large male rats in a cage with two compartments. If the females didn't feel like mating, they could escape into the second chamber through a hole too small for the larger frustrated males to follow.

It turned out that females exposed to A1221 left the males more often and took longer to return after each copulation attempt by the males (Bulletin of Environmental Contamination and Toxicology, vol 62, p 664). "We found that females stayed away
'"/>

Contact: Claire Bowles
claire.bowles@rbi.co.uk
44-171-331-2751
New Scientist
4-Aug-1999


Page: 1 2

Related biology news :

1. USC study links historical increases in life span to lower childhood exposure to infection
2. 9/11 search-and-rescue dogs exhibit few effects from exposure to disaster sites
3. Managing occupational exposures to potential bioterrorist agents
4. Infant rats eagerly accept high concentrations of alcohol upon first exposure
5. Early dexamethasone exposure has long-term neurodevelopment, neuroendocrine effects
6. Transplant rejection averted by simple light exposure in Stanford animal study
7. OHSU researchers discover possible connection between infant hormone exposure, obesity
8. Prenatal exposure to second-handsmoke greater for disadvantaged children, study finds
9. Deficits associated with prenatal alcohol exposure can be seen as early as infancy
10. Household activities release a cloud of dust, increasing exposure to particulate pollution
11. Models help estimate childrens exposure to toxins

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:5/6/2017)... 5, 2017 RAM Group , ... new breakthrough in biometric authentication based on a ... properties to perform biometric authentication. These new sensors are ... created by Ram Group and its partners. This sensor ... supply chains and security. Ram Group is a ...
(Date:4/19/2017)... , April 19, 2017 The ... vendor landscape is marked by the presence of several ... however held by five major players - 3M Cogent, ... companies accounted for nearly 61% of the global military ... companies in the global military biometrics market boast global ...
(Date:4/17/2017)... -- NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... 2016 Annual Report on Form 10-K on Thursday April 13, 2017 ... ... Investor Relations section of the Company,s website at http://www.nxt-id.com  under ... http://www.sec.gov . 2016 Year Highlights: ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... NJ (PRWEB) , ... October 11, 2017 , ... Personal eye wash is a basic ... one eye at a time. So which eye do you rinse first if a dangerous ... have Plum Duo Eye Wash with its unique dual eye piece. , “Whether ...
(Date:10/11/2017)... ROTTERDAM, the Netherlands and LAGUNA HILLS, ... that The Institute of Cancer Research, London ... will use MMprofilerâ„¢ with SKY92, SkylineDx,s prognostic tool to risk-stratify ... high-risk trial known as MUK nine . The University ... this trial, which is partly funded by Myeloma UK, and ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... San Diego-based ... of its corporate rebranding initiative announced today. The bold new look is part ... as the company moves into a significant growth period. , It will also expand ...
(Date:10/10/2017)... Oct. 10, 2017 International research firm Parks Associates ... speak at the TMA 2017 Annual Meeting , October 11 in ... the residential home security market and how smart safety and security products ... Parks Associates: Smart ... "The residential security market ...
Breaking Biology Technology:
Cached News: