Capt. David M. Harlan, left, and Dr. Carl H. June have been awarded the inaugural Frank Brown Berry Prize in Federal Medicine for their work in t-cell manipulation at the Naval Medical Research Institute in Bethesda, Md. Drs. Harlan and June have identified and are working with two t-cell "switches" , CD 28 and its counter-receptor, B7, focusing on three areas: stem cell biology, immune augmentation and immune suppression.
Using t-cell clones, the researchers have shown that preventing signaling through CD28 renders t-cells inactive toward the antigen they otherwise would
have recognized, a finding which has been used by other researchers to demonstrate the ability to transplant human insulin-producing cells in mice without an immune response. Drs. Harlan and June now report similar results with renal allografts in monkeys. This successful bypassing of immune mechanisms "clearly demonstrates that allograft tolerance might be an achievable goal in humans using this or a similar therapeutic approach," Drs. Harlan and June observe.
This "anergy therapy" approach might also block the immune responses in other important instances: for burn patients, for example, who cannot undergo skin transplants because they cannot undergo immunosuppression, and for xenotransplantations, that is, use of organs from other species. In addition, anergy therapy could be used on the battlefield, where treatment options are limited, to allow unrelated organ transplants.
On the flip side of immune research, Drs. Harlan and June are studying tel-cell augmentation, particularly as it relates to HIV infection. They have found that stimulating t-cells to grow via CD28 and another molecule made the cells resistant to a common strain of HIV. The exact mechanism of action was found to be the inactivation of CCR5, one of the t-cells' co-receptors. This finding could lead to new drugs that prevent CCR5 expression.
In addition to their research advances, Drs. Harlan and June have been honored for transferring their findings to industry.
In the words of one of the judges for the Berry Prize, the work being done by Drs. Harlan and June "may prove to be revolutionary in future approaches to rejection prevention of transplants organs, including both allografts and xenografts. Further, the targeted manipulation of t-cell activation or suppression may permit the improved treatment of autoimmune disorders, lymphocytotrophic retroviral infections and many other immune-mediated disorders. It is possible that t-cell manipulation may also be used to enhance clearance of certain viruses and even fungi that commonly infect humans and mammals."
Dr. Harlan is director of the Immune Cell Biology Program at the Naval Medical Research Institute. Dr. June, who headed that program during his years on active duty in the Navy, currently is with the Military HIV Research Program and the Henry M. Jackson Foundation for the Advancement of Military Medicine.
The Frank Brown Berry Prize in Federal Medicine honors the late Dr. Frank B. Berry, who served as assistant secretary of defense for health affairs and as editorial advisor to U.S. MEDICINE during its formative years. Judges for the prize were drawn from the Veterans Health Administration, National Institutes of Health, Uniformed Services University of the Health Sciences and U.S. MEDICINE.
The Frank Brown Berry
Prize for 1997 is co-sponsored by Science Applications International Corp.
(SAIC)
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