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USC research: Cancer cells and stem cells share same origin
Date:7/18/2011

Oncogenes are generally thought to be genes that, when mutated, change healthy cells into cancerous tumor cells. Scientists at the Keck School of Medicine of the University of Southern California (USC) have proven that those genes also can change normal cells into stem-like cells, paving the way to a safer and more practical approach to treating diseases like multiple sclerosis and cancer with stem cell therapy.

"The reality may be more complicated than people think," said Jiang F. Zhong, Ph.D., assistant professor of pathology at the Keck School. "What is a stem cell gene? What is a cancer gene? It may be the same thing."

Zhong and colleagues at the Children's Hospital of Orange County (CHOC) in California and Good Samaritan Hospital Medical Center in New York successfully converted human skin cells into brain cells by suppressing the expression of p53, a protein encoded by a widely studied oncogene. This suggests that p53 mutation helps determine cell fate good or bad rather than only the outcome of cancer.

The study is slated to appear in the online edition of Proceedings of the National Academy of Sciences, a peer-reviewed scientific journal, the week of July 18, 2011.

"When you turn off p53, people think the cell becomes cancerous because we tend to focus on the bad thing," Zhong said. "Actually, the cell becomes more plastic and could do good things, too. Let's say the cell is like a person who loses his job (the restriction of p53). He could become a criminal or he could find another job and have a positive effect on society. What pushes him one way or the other, we don't know because the environment is very complicated."

Stem cells can divide and differentiate into different types of cells in the body. In humans, embryonic stem cells differentiate into three families, or germ layers, of cells. The reasons why and how certain stem cells differentiate into particular layers are not clearly understood.
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Contact: Alison Trinidad
alison.trinidad@usc.edu
323-442-3941
University of Southern California
Source:Eurekalert

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