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September 27, 2012--------News Archive Return to: News Alerts


Induced pluripotent stem cells generated using a kinase inhibitor.

Credit: Sanford-Burnham Medical Research Institute

WHO Child Growth Charts

       

Making Stem Cells More Easily

Researchers identify kinase inhibitors that lower the barrier to producing stem cells in the laboratory—cells important for disease research and drug development

The process researchers have used to generate induced pluripotent stem cells (iPSCs)—a special type of stem cell that can be made in the lab from any type of adult cell—is time consuming and inefficient.

To speed things up, researchers at Sanford-Burnham Medical Research Institute (Sanford-Burnham) turned to kinase inhibitors. These chemical compounds block the activity of kinases, enzymes responsible for many aspects of cellular communication, survival, and growth.

As they outline in a paper published September 25 in Nature Communications, the team found several kinase inhibitors that, when added to starter cells, help generate many more iPSCs than the standard method.

This new capability will likely speed up research in many fields, better enabling scientists around the world to study human disease and develop new treatments.


"Generating iPSCs depends on the regulation
of communication networks within cells.

So, when you start manipulating which genes are
turned on or off in cells to create pluripotent stem cells,
you are probably activating a large number of kinases.

Since many of these active kinases are likely inhibiting
the conversion to iPSCs, it made sense to us that
inhibiting kinases might lower the barrier."

Tariq Rana, Ph.D., program director, Sanford-Burnham's Sanford Children's Health Research Center,senior author


According to Tony Hunter, Ph.D., professor in the Molecular and Cell Biology Laboratory at the Salk Institute for Biological Studies and director of the Salk Institute Cancer Center, "The identification of small molecules that improve the efficiency of generating iPSCs is an important step forward in being able to use these cells therapeutically. Tariq Rana's exciting new work has uncovered a class of protein kinase inhibitors that override the normal barriers to efficient iPSC formation, and these inhibitors should prove useful in generating iPSCs from new sources for experimental and ultimately therapeutic purposes." Hunter, a kinase expert, was not involved in this study.

The promise of iPSCs
At the moment, the only treatment option available to many heart failure patients is a heart transplant. Looking for a better alternative, many researchers are coaxing stem cells into new heart muscle.

In Alzheimer's disease, researchers are also interested in stem cells, using them to reproduce a person's own malfunctioning brain cells in a dish, where they can be used to test therapeutic drugs. But where do these stem cells come from?

Since the advent of iPSC technology, the answer in many cases is the lab.


Like their embryonic cousins, iPSCs
can be used to generate just about any cell type
—heart, brain, or muscle, to name a few—
that can be used to test new therapies
or potentially to replace diseased
or damaged tissue.


It sounds simple enough: you start with any type of differentiated cell, such as skin cells, add four molecules that reprogram the cells' genomes, and then try to catch those that successfully revert to unspecialized iPSCs. But the process takes a long time and isn't very efficient—you can start with thousands of skin cells and end up with just a few iPSCs.

Inhibiting Kinases to Make More iPSCs
Zhonghan Li, a graduate student in Rana's laboratory, took on the task of finding kinase inhibitors that might speed up the iPSC-generating process. Scientists in the Conrad Prebys Center for Chemical Genomics, Sanford-Burnham's drug discovery facility, provided Li with a collection of more than 240 chemical compounds that inhibit kinases.

Li painstakingly added them one-by-one to his cells and waited to see what happened. Several kinase inhibitors produced many more iPSCs than the untreated cells—in some cases too many iPSCs for the tiny dish housing them. The most potent inhibitors targeted three kinases in particular: AurkA, P38, and IP3K.

Working with the staff in Sanford-Burnham's genomics, bioinformatics, animal modeling, and histology core facilities—valuable resources and expertise available to all Sanford-Burnham scientists and the scientific community at large—Rana and Li further confirmed the specificity of their findings and even nailed down the mechanism behind one inhibitor's beneficial actions.


"We found that manipulating the activity
of these kinases can substantially increase
cellular reprogramming efficiency.
But what's more, we've also provided new insights
into the molecular mechanism of reprogramming
and revealed new functions for these kinases.

We hope these findings will encourage further efforts
to screen for small molecules that might prove
useful in iPSC-based therapies."

Tariq Rana, Ph.D.


About Sanford-Burnham Medical Research Institute
Sanford-Burnham Medical Research Institute is dedicated to discovering the fundamental molecular causes of disease and devising the innovative therapies of tomorrow. The Institute consistently ranks among the top five organizations worldwide for its scientific impact in the fields of biology and biochemistry (defined by citations per publication) and currently ranks third in the nation in NIH funding among all laboratory-based research institutes. Sanford-Burnham utilizes a unique, collaborative approach to medical research and has established major research programs in cancer, neurodegeneration, diabetes, and infectious, inflammatory, and childhood diseases. The Institute is especially known for its world-class capabilities in stem cell research and drug discovery technologies. Sanford-Burnham is a U.S.-based, non-profit public benefit corporation, with operations in San Diego (La Jolla), California and Orlando (Lake Nona), Florida. For more information, news, and events, please visit us at sanfordburnham.org.

Original article: Making it easier to make stem cells