( In a study to be published in the Janua...)Sickle cell disease corrected in human models using stem cell-based gene therapy

In a study to be published in the January 2006 issue of Nature Biotechnology, researchers led by a team of scientists at Memorial Sloan-Kettering Cancer Center have devised a novel strategy that uses stem cell-based gene therapy and RNA interference to genetically reverse sickle cell disease (SCD) in human cells. This research is the first to demonstrate a way to genetically correct this debilitating blood disease using RNA interference technology.

To prevent the production of the abnormal hemoglobin that causes sickle cell disease, a viral vector was introduced in cell cultures of patients who have the disease. The vector carried a therapeutic globin gene harboring an embedded small interfering RNA precursor designed to suppress abnormal hemoglobin formation. Tested in adult stem cells from SCD patients, researchers found that the newly formed red blood cells made normal hemoglobin and suppressed production of the sickle shaped hemoglobin typical of the disease.

"Sickle cell disease can only be cured by transplanting healthy blood-forming stem cells from another individual, but this option is not available to most patients due to the difficulty in finding a compatible donor," explained Michel Sadelain, MD, PhD, of the Immunology Program at MSKCC and the study's senior author. "By using gene transfer, there is always a donor match because the patient's own stem cells are used to treat the disease."

Sickle cell disease is a genetic condition that causes an abnormal type of hemoglobin to be made in red blood cells. The aggregation of hemoglobin S inside red cells interferes with the body's blood cells' ability to flow through small blood vessels, depriving tissues of adequate oxygen supply. This can cause pain, anemia, infections, organ damage, and stroke. Approximately 80,000 people in the United States have this inherited condition, which is primarily found in people of African, Mediterranean, Indian, or Middle Eastern origin. There is no kn
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Source:Memorial Sloan-Kettering Cancer Center

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