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Cancer risk: Aspirin and smoking affect aging of genes
Date:7/1/2014

The risk of developing cancer increases with age. Factors like smoking and regular aspirin use also affect the risk of cancer although in the opposite sense. Researchers from the University of Basel were now able to show that aspirin use and smoking both influence aging processes of the female genome that are connected to colorectal cancer. The Journal of the National Cancer Institute has published their results.

Already in the 1990s, scientists discovered that regular use of aspirin over long periods of time decreases the cancer risk. Since then, numerous studies have confirmed the protective effect of the drug against different types of cancer. Regular aspirin use is said to reduce the risk to develop colorectal cancer by an average of 40%. However, it is unknown how exactly the drug influences the cancer risk.

A research group led by Prof. Primo Schr, molecular geneticists at the Department of Biomedicine from the University of Basel and gastrointestinal specialist PD Dr. Kaspar Truninger, has now discovered a possible mechanism of how aspirin decreases the risk of cancer: It slows down certain aging processes of the genome - namely modifications that also play an important role in the development of tumors.

In order to analyze the relationships between lifestyle and genome aging, the researchers examined intestinal tissue samples of 546 healthy women over 50 years of age. They compared age-specific changes of gene markers, so-called DNA methylations, with the women's lifestyle factors regarding aspirin use, smoking, body mass index and hormonal replacement therapy. The most significant effects were measured for aspirin use and smoking.

Aging Markers

"Each cell's genome resembles a library that is full of bookmarks", explains Schr. Thanks to these bookmarks, the cells know which genes to read, so that they can fulfill their specialized tasks as skin, muscle or intestinal cells.
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Contact: Olivia Poisson
olivia.poisson@unibas.ch
University of Basel
Source:Eurekalert  

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