Navigation Links
Cancer from fetal exposure to carcinogens depends on dose, timing
Date:12/15/2011

CORVALLIS, Ore. The cancer-causing potential of fetal exposure to carcinogens can vary substantially, a recent study suggests, causing different types of problems much later in life depending on the stage of pregnancy when the fetus is exposed.

The research sheds further light on the way in which toxic damage early in life can later manifest itself as cancer, due to "epigenetic" changes in cells. It was done by scientists in the Linus Pauling Institute at Oregon State University, and other institutions, in laboratory studies with mice.

In this study, published in the journal Cancer Letters, mice received four separate doses of a carcinogen commonly found in air pollutants or other combustion products. As a result, they had triple the level of ovarian cancer at the rodent equivalent of middle age. About 80 percent of them also got lung cancer, and many of the male mice had abnormally small testes a phenomenon not seen before.

In previous research, by contrast, the same amount of this carcinogen given in a single dose had caused a much higher rate of T-cell lymphoma, a type of blood cancer, which this study found to almost disappear when the carcinogen exposure was spread out over time. Liver cancer also was largely absent.

"There's still a lot of uncertainty about how the fetus responds to carcinogens and at what points in time it is most vulnerable," said David Williams, a professor of environmental and molecular toxicology at OSU.

"We know it's far more sensitive than adults for several reasons, including faster cell division and the lack of protective detoxifying enzymes," he said. "But it's interesting that the timing of fetal exposure makes such a difference in which organs are targeted. These results were somewhat surprising."

The mice in these experiments were exposed to one type of polycyclic aromatic hydrocarbon, a group of compounds commonly produced by everything from coal combustion to automobile exhaust. The levels of carcinogen the mice received were far higher than humans would face in a normal environment.

In the research, tracking with radioactive labeling showed that the carcinogens clearly made their way into the mouse fetuses, although at about 10 percent of the tissue concentration of those in the mother. The study was supported by the National Institutes of Health, and included collaborators from OSU and the Pacific Northwest National Laboratory.

Increasing amounts of research are being done on PAHs, which are associated with the burning of fossil fuels such as coal and petroleum, and may be on the rise in some areas, particularly China, Williams said. They can also get into soils, be taken up by plants and make their way into the human food chain.

The types of cancer that these carcinogens can cause in animal models include lymphoma and leukemia, and cancer is the number one cause of disease-related death in children. Epidemiological studies have shown that exposure of pregnant women to carcinogens such as cigarette smoke enhances the risk for offspring to develop a number of cancers.

"The fetal basis of adult disease is relevant to a number of chronic diseases in humans, including diabetes, asthma, cardiovascular disease and cancer," the researchers wrote in their report, "as well as neurological and behavior toxicities."

Research such as this, scientists say, suggests that a healthy diet is important during pregnancy, including a wide range of fruits and vegetables. Cruciferous vegetables such as broccoli and cauliflower, in particular, have high levels of some compounds believed to help protect against cancer.


'/>"/>
Contact: David Williams
david.williams@oregonstate.edu
541-737-3277
Oregon State University
Source:Eurekalert

Related biology news :

1. Breast cancer treatment resistance linked to signaling pathway
2. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
3. The dietary supplement genistein can undermine breast cancer treatment
4. Saliva proteins could help detection of oral cancer
5. Vitamin C supplements may reduce benefit from wide range of anti-cancer drugs
6. Breakthrough optical technology to assess colon cancer risk, accuracy
7. Breast cancer cells recycle to escape death by hormonal therapy
8. Nanodiamond drug device could transform cancer treatment
9. Second lumpectomy for breast cancer reduces survival rates
10. Study looks at psychological impact of gene test for breast cancer
11. SNM releases new fact sheet on breast cancer and molecular imaging
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/28/2017)...   Acuant , a leading provider of data ... to new and core technologies building upon the acquisition ... and desktop Acuant FRM TM facial recognition and ... time manual review of identity documents by accredited professionals. ... and most accurate capture software to streamline workflows by ...
(Date:2/24/2017)... , Feb. 24, 2017  EyeLock LLC, a leader ... its elite iris biometric solution on the latest ... LTE at Mobile World Congress 2017 (February ... Booth in Hall 3, Stand 3E10. ... Qualcomm Haven™ security platform—a combination of hardware, ...
(Date:2/14/2017)... 14, 2017  Wake Forest Baptist Medical Center today ... chief executive officer (CEO). Freischlag joins the medical center ... McConnell , M.D., who last year announced that he ... Center, after leading it since 2008.   ... Wake Forest Baptist,s academic health system, which includes Wake ...
Breaking Biology News(10 mins):
(Date:3/22/2017)... ... , ... March 22, 2017...Council for Agricultural Science and Technology, Ames, Iowa. ... innovation in smart, sustainable ways. Humans depend on plants for food, feed, fiber, and ... This paper is the first in a series that connects science and technology to ...
(Date:3/22/2017)... 2017  RXi Pharmaceuticals Corporation (NASDAQ: RXII), a ... significant unmet medical needs, today announced Alexey ... present at the 5th Annual Cancer BioPartnering & ... to present to and meet with thought leaders ... companies as well as institutional investors. This event ...
(Date:3/20/2017)... Diego, CA (PRWEB) , ... ... ... (EDCs) are substances that interfere with the ability of endogenous hormones to ... or inhibiting ligand binding activity (antagonists), EDCs produce adverse reproductive, neurological, proliferative, ...
(Date:3/20/2017)... (PRWEB) , ... March 20, 2017 , ... ... expensive and laborious sample preparation methods in order to reduce the impact on ... outside of the area of elemental analysis. , This presentation will discuss ...
Breaking Biology Technology: