Curious female rats survive tumors longer
Curious female rats, more willing to step out and explore their environment, survive breast and pituitary tumors longer than their more cautious sisters, says a Penn State researcher.
Dr. Sonia Cavigelli, assistant professor of biobehavioral health, says that her study of 80 female rats from birth to death shows that the curious ones with tumors lived, on average, an additional six months, or 25 percent longer lives, than the cautious ones.
“Its difficult to extrapolate from rats to people,Ó she notes.ÒHowever, there have been studies that show that shy elderly people report more health symptoms than their more outgoing age-mates. Our new results with rats are consistent with those findings and support the notion that personality traits may have a significant impact on health and resilience to disease.”
Cavigelli, who joined the Penn State faculty in August, detailed the results at the American Psychosomatic Society meeting in Vancouver, Canada, in a paper, Exploratory Tendency During Infancy and Survival in Female Rats with Spontaneous Tumors. She conducted the study while she was a postdoctoral researcher at the University of Chicago. Her co-authors are J. R. Yee, graduate student in human development, and Dr. Martha McClintock, professor of psychology, both at the University of Chicago.
The rats used in the study spontaneously develop breast or pituitary tumors near the end of their lives. In the study, 93 percent of the rats developed these tumors.
Cavigelli says,”Tumor progression is a lengthy process and, therefore, may be particularly prone to subtle effects of personality on disease resilience.”
The rats were tested in infancy and as adults to see how curious or cautious they were by placing them in a “playground” filled with unfamiliar objects likely to intrigue rodents, including tunnels, bricks, stones and a small box. Some of the rats, from infancy, readily explored the environment and were designated “curious.” Those that hesitated to emerge from the bowl used to introduce them into the environment were designated “cautious.”
The cautious and curious rats developed equal numbers of breast and pituitary tumors over their lifespan but those identified as more curious during infancy/early childhood lived longer than the cautious ones. The difference in life span was comparable to several human years.
The same rats stress hormones were also measured after being placed briefly in a new tunnel.The cautious females had lower stress hormone responses than the curious ones. This finding in female rats is the opposite of the result Cavigelli saw in an earlier study with male rats.The males stress hormones were lower in the curious rodents.
“These results suggest that both elevated and dampened stress hormone production may be associated with disease resilience or accelerated aging,” says the Penn State researcher.
All latest news from the category: Life Sciences and Chemistry
Articles and reports from the Life Sciences and chemistry area deal with applied and basic research into modern biology, chemistry and human medicine.
Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.
Under arrest: Using nanofibers to stop brain tumor cells from spreading
Researchers from Japan develop a platform based on nanofibers to trap brain cancer cells as a therapeutic strategy. Our body heals its injuries by essentially replacing damaged cells with new…
New photonic chip for isolating light may be key to miniaturizing quantum devices
Light offers an irreplaceable way to interact with our universe. It can travel across galactic distances and collide with our atmosphere, creating a shower of particles that tell a story…
A traffic light for light-on-a-chip
Integrated photonics allow us to build compact, portable, low-power chip-scale optical systems used in commercial products, revolutionizing today’s optical datacenters and communications. But integrating on-chip optical gain elements to build…