Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Reprogramming patients' cells offers powerful new tool for studying, treating blood diseases

31.07.2013
CHOP researchers advance stem cell studies in a childhood leukemia and diamond blackfan anemia

First produced only in the past decade, human induced pluripotent stem cells (iPSCs) are capable of developing into many or even all human cell types. In new research, scientists reprogrammed skin cells from patients with rare blood disorders into iPSCs, highlighting the great promise of these cells in advancing understanding of those challenging diseases—and eventually in treating them.

"The technology for generating these cells has been moving very quickly," said hematologist Mitchell J. Weiss, M.D., Ph.D., corresponding author of two recent studies led by The Children's Hospital of Philadelphia (CHOP). "These investigations can allow us to better understand at a molecular level how blood cells go wrong in individual patients—and to test and generate innovative treatments for the patients' diseases."

Weiss, with Monica Bessler, M.D., Philip Mason, Ph.D., and Deborah L. French, Ph.D., all of CHOP, led a study on iPSCs and Diamond Blackfan anemia (DBA) published online June 6 in Blood. Another study by Weiss, French and colleagues in the same journal on April 25 focused on iPSCs in juvenile myelomonocytic leukemia (JMML).

In DBA, a mutation prevents a patient's bone marrow from producing normal quantities of red blood cells, resulting in severe, sometimes life-threatening anemia. This basic fact makes it difficult for researchers to discern the underlying mechanism of the disease: "It's very difficult to figure out what's wrong, because the bone marrow is nearly empty of these cells," said Bessler, the director of CHOP's Pediatric and Adult Comprehensive Bone Marrow Failure Center.

The study team removed fibroblasts (skin cells) from DBA patients, and in cell cultures, using proteins called transcription factors, reprogrammed the cells into iPSCs. As those iPSCs were stimulated to form blood tissues, like the patient's original mutated cells, they were deficient in producing red blood cells.

However, when the researchers corrected the genetic defect that causes DBA, the iPSCs developed into red blood cells in normal quantities. "This showed that in principle, it's possible to repair a patient's defective cells," said Weiss.

Weiss cautioned that this proof-of-principle finding is an early step, with many further studies to be done to verify if this approach will be safe and effective in clinical use.

However, he added, the patient-derived iPSCs are highly useful as a model cell system for investigating blood disorders. For instance, DBA is often puzzling, because two family members may have the same mutation, but only one may be affected by the disease. Because each set of iPSCs is specific to the individual from whom they are derived, researchers can compare the sets to identify molecular differences, such as a modifier gene active in one person but not the other.

Furthermore, the cells offer a renewable, long-lasting model system for testing drug candidates or gene modifications that may offer new treatments, personalized to individual patients.

The second study in Blood provides a concrete example of using iPSCs for drug testing, specifically for the often-aggressive childhood leukemia, JMML. First the study team generated iPSCs from two children with JMML, and then manipulated the iPSCs in cell cultures to produce myeloid cells that multiplied uncontrollably, much as the original JMML cells do.

They then tested the cells with two drugs, each able to inhibit a separate protein known to be highly active in JMML. One drug, an inhibitor of the MEK kinase, reduced the proliferation of cancerous cells in culture. "This provides a rationale for a potential targeted therapy for this specific subtype of JMML," said Weiss.

A stem cell core facility at CHOP, directed by study co-author Deborah French under the auspices of the hospital's Center for Cellular and Molecular Therapeutics, generated the iPSCs lines used in these studies. The facility's goal is to develop and maintain standardized iPSCs lines specific to a variety of rare inherited diseases—not only DBA and JMML, but also dyskeratosis congenita, congenital dyserythropoietic anemia, thrombocytopenia absent radii (TAR), Glanzmann's thrombasthenia and Hermansky- Pudlak syndrome.

A longer-term goal, added Weiss, is for the iPSC lines to provide the raw materials for eventual cell therapies that could be applied to specific genetic disorders. "The more we learn about the molecular details of how these diseases develop, the closer we get to designing precisely targeted tools to benefit patients."

The National Institutes of Health (grants HL101606, DK090969) supported both studies. Also supporting the Diamond Blackfan anemia study were the U.S. Department of Defense (grant BM090168), and N.I.H. grants CA106995, CA105312, RR024134, and TR000003. Other funders of the JMML study were N.I.H. grants HL099656 and CA082103, the Cookies for Kids' Cancer Foundation, the Leukemia and Lymphoma Society and the Frank A. Campini Foundation. Weiss's research on stem cells is also supported by the Jane Fishman Grinberg Endowed Chair and Bessler receives support from the Buck Family Endowed Chair in Hematology.

"Ribosomal and hematopoietic defects in induced pluripotent stem cells derived from Diamond Blackfan anemia patients," Blood, published online June 6, 2013. http://doi.org/10.1182/blood-2013-01-478321

"Patient-derived induced pluripotent stem cells recapitulate hematopoietic abnormalities of juvenile myelomonocytic leukemia," Blood, published online April 25, 2013. http://doi.org/10.1182/blood-2013-01-478412

About The Children's Hospital of Philadelphia: The Children's Hospital of Philadelphia was founded in 1855 as the nation's first pediatric hospital. Through its long-standing commitment to providing exceptional patient care, training new generations of pediatric healthcare professionals and pioneering major research initiatives, Children's Hospital has fostered many discoveries that have benefited children worldwide. Its pediatric research program receives the highest amount of National Institutes of Health funding among all U.S. children's hospitals. In addition, its unique family-centered care and public service programs have brought the 527-bed hospital recognition as a leading advocate for children and adolescents.

John Ascenzi | EurekAlert!
Further information:
http://www.chop.edu

More articles from Life Sciences:

nachricht New eDNA technology used to quickly assess coral reefs
18.04.2019 | University of Hawaii at Manoa

nachricht New automated biological-sample analysis systems to accelerate disease detection
18.04.2019 | Polytechnique Montréal

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

A stellar flare 10 times more powerful than anything seen on our sun has burst from an ultracool star almost the same size as Jupiter

  • Coolest and smallest star to produce a superflare found
  • Star is a tenth of the radius of our Sun
  • Researchers led by University of Warwick could only see...

Im Focus: Quantum simulation more stable than expected

A localization phenomenon boosts the accuracy of solving quantum many-body problems with quantum computers which are otherwise challenging for conventional computers. This brings such digital quantum simulation within reach on quantum devices available today.

Quantum computers promise to solve certain computational problems exponentially faster than any classical machine. “A particularly promising application is the...

Im Focus: Largest, fastest array of microscopic 'traffic cops' for optical communications

The technology could revolutionize how information travels through data centers and artificial intelligence networks

Engineers at the University of California, Berkeley have built a new photonic switch that can control the direction of light passing through optical fibers...

Im Focus: A long-distance relationship in femtoseconds

Physicists observe how electron-hole pairs drift apart at ultrafast speed, but still remain strongly bound.

Modern electronics relies on ultrafast charge motion on ever shorter length scales. Physicists from Regensburg and Gothenburg have now succeeded in resolving a...

Im Focus: Researchers 3D print metamaterials with novel optical properties

Engineers create novel optical devices, including a moth eye-inspired omnidirectional microwave antenna

A team of engineers at Tufts University has developed a series of 3D printed metamaterials with unique microwave or optical properties that go beyond what is...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Revered mathematicians and computer scientists converge with 200 young researchers in Heidelberg!

17.04.2019 | Event News

First dust conference in the Central Asian part of the earth’s dust belt

15.04.2019 | Event News

Fraunhofer FHR at the IEEE Radar Conference 2019 in Boston, USA

09.04.2019 | Event News

 
Latest News

New automated biological-sample analysis systems to accelerate disease detection

18.04.2019 | Life Sciences

Explosion on Jupiter-sized star 10 times more powerful than ever seen on our sun

18.04.2019 | Physics and Astronomy

New eDNA technology used to quickly assess coral reefs

18.04.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>