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Scientists bioengineer a protein to fight leukemia
Date:2/18/2011

LOS ANGELES (February 18, 2011) Scientists at the Children's Center for Cancer and Blood Diseases and The Saban Research Institute of Children's Hospital Los Angeles today announced a breakthrough discovery in understanding how the body fights leukemia. They have identified a protein called CD19-ligand (CD19-L) located on the surface of certain white blood cells that facilitates the recognition and destruction of leukemia cells by the immune system. This work represents the first report of a bioengineered version of CD19-L, a recombinant human biotherapeutic agent, targeting CD19-positive leukemic stem cells.

B-lineage acute lymphoblastic leukemia (ALL) is the most common cancer occurring in children and adolescents. Despite having received intensive chemotherapy, some patients have recurring disease. For these individuals, the prospect of long-term survival is poor.

"We need new anti-leukemia therapies capable of killing chemotherapy-resistant leukemia cells in patients with relapsed ALL. These are the cells that are the most difficult to treat. The challenge is to kill these cells while leaving healthy cells intact," said Fatih Uckun, MD, PhD, first author on the paper that has been published in the British Journal of Haematology. Dr. Uckun is also a professor of Pediatrics at the University of Southern California Keck School of Medicine and a member of the Developmental Therapeutics Program at the Norris Comprehensive Cancer Center.

Lymphocytes are a type of white blood cell involved in immune function and are categorized as either B-cells or T-cells. This newly discovered element, CD19-L, is expressed on the surface of T-lymphocytes and allows them to selectively bind to the CD19 receptor on the surface of B-lineage leukemia cells, and most importantly on leukemic stem cells responsible for the survival and expansion of the leukemia cell population. Once the CD19-L binds to leukemia cells, cell death occurs.
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Contact: Ellin Kavanagh
ekavanagh@chla.usc.edu
323-361-8505
Children's Hospital Los Angeles
Source:Eurekalert  

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