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Preclinical study suggests organ-transplant drug may aid in lupus fight
Date:8/15/2007

DALLAS Aug. 15, 2007 A compound related to a drug used in humans to prevent organ-transplant rejection attacks a key biochemical process in the faulty immune cells of lupus-prone mice, suggesting a possible new approach to combating the disease, UT Southwestern Medical Center researchers have found.

We found that an analog of rapamycin is very effective in improving all aspects of the disease in lupus-prone mice, said Dr. Chandra Mohan, professor of internal medicine and senior author of a study appearing in the August issue of the Journal of Clinical Investigation. Our next step will be to see if the same biochemical pathways exist in humans. If they do, this research and treatment could prove very significant.

Lupus is a chronic autoimmune disease in which the immune system attacks the bodys cells and tissues. In a normal immune system, foreign intruders are recognized by special immune cells called B-cells, which produce antibodies. In patients with lupus, however, the antibodies created by the B-cells start to attack the body itself.

Certain genetic strains of mice are prone to developing lupus. In the current study, a research team led by Dr. Mohan discovered that an analog of rapamycin shuts down specific biochemical processes in the B-cells of the mice. Rapamycin has been used in humans to prevent organ transplant rejection and for treating cancer. The analog of rapamycin halted production of antibodies and the development of lupus in all the strains of lupus-prone mice, as well as improved symptoms, despite each animal having a different genetic makeup that led to the disease.

Though lupus in different mouse models may originate from different genetic triggers, those triggers ultimately funnel through a shared series of biochemical pathways that lead to the disease, Dr. Mohan said. These shared biochemical pathways represent an attractive target for future therapeutic intervention in lupus patients.

In humans, lupus can cause life-threatening damage to the kidneys, lungs, heart, central nervous system, joints, blood vessels and skin. It can be associated with severe fatigue, joint pain, skin rashes, hair loss and neurological problems. Although treatable symptomatically, there is currently no cure for the disease, which affects up to 1 million people in the U.S.


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Contact: Erin Prather Stafford
erin.pratherstafford@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
Source:Eurekalert

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