Navigation Links
Recipe for large numbers of stem cells requires only one ingredient, says NIH/Pitt team
Date:4/17/2013

Stem cells and tissue-specific cells can be grown in abundance from mature mammalian cells simply by blocking a certain membrane protein, according to scientists at the University of Pittsburgh School of Medicine and the National Institutes of Health (NIH). Their experiments, reported today in Scientific Reports, also show that the process doesn't require other kinds of cells or agents to artificially support cell growth and doesn't activate cancer genes.

Scientists hope that lab-grown stem cells and induced pluripotent stem (iPS) cells, which have the ability to produce specialized cells such as neurons and cardiac cells, could one day be used to treat diseases and repair damaged tissues, said co-author Jeffrey S. Isenberg, M.D., associate professor, Division of Pulmonary, Allergy and Critical Care Medicine, Pitt School of Medicine.

"Even though stem cells are able to self-renew, they are quite challenging to grow in the lab," he said. "Often you have to use feeder cells or introduce viral vectors to artificially create the conditions needed for these cells to survive and thrive."

In 2008, prior to joining Pitt, Dr. Isenberg was working in the National Cancer Institute (NCI) lab of senior author David D. Roberts, Ph.D., using agents that block a membrane protein called CD47 to explore their effects on blood vessels. He noticed that when cells from the lining of the lungs, called endothelium, had been treated with a CD47 blocker, they stayed healthy and maintained their growth and function for months.

Dr. Roberts' NIH team continued to experiment with CD47 blockade, focusing on defining the underlying molecular mechanisms that control cell growth.

They found that endothelial cells obtained from mice lacking CD47 multiplied readily and thrived in a culture dish, unlike those from control mice. Lead author Sukhbir Kaur, Ph.D., discovered that this resulted from increased expression of four genes that are regarded to be essential for formation of iPS cells. When placed into a defined growth medium, cells lacking CD47 spontaneously formed clusters characteristic of iPS cells. By then introducing various growth factors into the culture medium, these cells could be directed to become cells of other tissue types. Despite their vigorous growth, they didn't form tumors when injected into mice, a major disadvantage when using existing iPS cells.

"Stem cells prepared by this new procedure should be much safer to use in patients," Dr. Roberts noted. "Also, the technique opens up opportunities to treat various illnesses by injecting a drug that stimulates patients to make more of their own stem cells."

According to Dr. Isenberg, "These experiments indicate that we can take a primary human or other mammalian cell, even a mature adult cell, and by targeting CD47 turn on its pluripotent capability. We can get brain cells, liver cells, muscle cells and more. In the short term, they could be a boon for a variety of research questions in the lab."

In the future, blocking CD47 might make it possible to generate large numbers of healthy cells for therapies, such as alternatives to conventional bone marrow transplantation and complex tissue and organ bioengineering, he added.

"These exciting findings provide a rationale for using CD47 blocking therapies to increase stem cell uptake and survival in transplanted organs, matrix grafts, or other applications," said Mark Gladwin, M.D., professor and chief, Division of Pulmonary, Allergy and Critical Care Medicine, Pitt School of Medicine. "This continues a strong and productive collaboration between investigators at the NCI and the University of Pittsburgh's Vascular Medicine Institute."


'/>"/>

Contact: Anita Srikameswaran
SrikamAV@upmc.edu
412-578-9193
University of Pittsburgh Schools of the Health Sciences
Source:Eurekalert

Related biology news :

1. Searching for the solar systems chemical recipe
2. Study provides recipe for supercharging atoms with X-ray laser
3. Different recipes for success in the world of plants
4. Nonsurgical treatment turns back the clock, shrinks enlarged prostate
5. 8 M € from EU to enhance access by scientists to the largest European biobanks
6. Genes behind obesity mapped in large-scale study
7. Tracking sediments fate in largest-ever dam removal
8. The large-scale EU project EU BON: Towards integration with its global counterpart GEO BON
9. Color in fossil insects, diamonds from the ancient ocean floor and modeling the worlds largest rivers
10. Centre for Carbon Measurement set to deliver large carbon reductions
11. Large, ancient landslides delivered preferred upstream habitats for coho salmon
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/9/2016)... TURKU, Finland , June 9, 2016 ... French National Police deploy Teleste,s video security solution to ensure ... France during the major tournament ... and data communications systems and services, announced today that its ... Police Prefecture to back up public safety across ...
(Date:6/2/2016)... Perimeter Surveillance & Detection Systems, ... Infrastructure, Support & Other Service  The latest ... comprehensive analysis of the global Border Security market ... of $17.98 billion in 2016. Now: In ... in software and hardware technologies for advanced video surveillance. ...
(Date:5/12/2016)... -- WearablesResearch.com , a brand of Troubadour Research ... the Q1 wave of its quarterly wearables survey. A ... to a program where they would receive discounts for ... "We were surprised to see that so ... , CEO of Troubadour Research, "primarily because there are ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... ... 2016 , ... Cancer experts from Austria, Hungary, Switzerland, and ... new and helpful biomarker for malignant pleural mesothelioma. Surviving Mesothelioma has just published ... , Biomarkers are components in the blood, tissue or body fluids that ...
(Date:6/27/2016)... ... 2016 , ... Newly created 4Sight Medical Solutions ... healthcare market. The company's primary focus is on new product introductions, to include ... are necessary to help companies efficiently bring their products to market. , The ...
(Date:6/27/2016)... 2016  Liquid Biotech USA ... a Sponsored Research Agreement with The University of ... from cancer patients.  The funding will be used ... with clinical outcomes in cancer patients undergoing a ... be employed to support the design of a ...
(Date:6/24/2016)...  Regular discussions on a range of subjects including policies, ... entities said Poloz. Speaking at a lecture to ... he pointed to the country,s inflation target, which is set ... "In certain areas there needs ... economic goals, why not sit down and address strategy together?" ...
Breaking Biology Technology: