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MicroRNA cocktail helps turn skin cells into stem cells
Date:2/2/2011

LA JOLLA, Calif., February 1, 2011 Stem cells are ideal tools to understand disease and develop new treatments; however, they can be difficult to obtain in necessary quantities. In particular, generating induced pluripotent stem (iPS) cells can be an arduous task because reprogramming differentiated adult skin cells into iPS cells requires many steps and the efficiency is very low researchers might end up with only a few iPS cells even if they started with a million skin cells. A team at Sanford-Burnham Medical Research Institute (Sanford-Burnham) set out to improve this process. In a paper published February 1 in The EMBO Journal, the team identified several specific microRNAs (miRNAs) that are important during reprogramming and exploited them to make the transition from skin cell to iPS cell more efficient.

"We identified several molecular barriers early in the reprogramming process and figured out how to remove them using miRNA," said Tariq Rana, Ph.D., director of the RNA Biology program at Sanford-Burnham and senior author of the study. "This is significant because it will enhance our ability to use iPS cells to model diseases in the laboratory and search for new therapies."

"Our study not only presents new mechanistic insights about the role of non-coding RNAs during somatic cell reprogramming but also provides proof of principle using microRNAs as great enhancers for iPS cell generation," added Zhonghan Li, graduate student and first author of the study.

MiRNAs are small strands of genetic material that may play a major role in many diseases by gumming up protein production. In this study, Dr. Rana and his colleagues observed that three groups of miRNAs, including two known individually as miR-93 and miR-106b, are activated as part of a defense mechanism that occurs when cells are stressed by the standard skin cell reprogramming process. Digging deeper, they determined that miR-93 and miR-106b target two proteins cal
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Contact: Josh Baxt
jbaxt@sanfordburnham.org
858-795-5236
Sanford-Burnham Medical Research Institute
Source:Eurekalert

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