CAMBRIDGE, Mass. (August 6, 2008) A drug-like molecule called Wnt can be substituted for the cancer gene c-Myc, one of four genes added to adult cells to reprogram them to an embryonic-stem-cell-like state, according to Whitehead researchers. Researchers hope that such embryonic stem-cell-like cells, known as induced pluripotent (IPS) cells, eventually may treat diseases such as Parkinson's disease and diabetes.
Demonstrated in mice, the elimination of c-Myc represents an important step in creating IPS cells in a manner that in the future may be applied to human therapeutics.
"This is a good sign for the possible replacement of the other three genes used to reprogram cells," says Ruth Foreman, a MD/PhD student in the lab of Whitehead Member Rudolf Jaenisch and a lead co-author on the paper, published online in Cell Stem Cell on August 6. The other lead co-authors are Alex Marson, an MD/PhD student in the labs of Jaenisch and Whitehead Member Richard Young, and Brett Chevalier, a research scientist in the Young lab.
"IPS cells hold great potential for future medicine, but we must learn how to generate these cells in a manner that is safe for clinical therapies," says Young, who is also a professor of biology at Massachusetts Institute of Technology. "This advance in reprogramming is one key step toward that goal,"
Currently, IPS cells can be created by reprogramming adult cells through the use of viruses to transfer four genes (Oct4, Sox2, c-Myc and Klf4) into the cells' DNA. The activated genes then override the adult state and convert the cells to embryonic-like IPS cells.
However, this method poses significant risks for potential use in humans.
First, the viruses employed in the process, called retroviruses, are associated with cancer because they insert DNA anywhere in a cell's genome, thereby potentially triggering the expression of cancer-causing genes, or oncogenes. Second, c-Myc is a kno
|Contact: Cristin Carr|
Whitehead Institute for Biomedical Research