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New clues found to preventing lung transplant rejection
Date:2/25/2014

Organ transplant patients routinely receive drugs that stop their immune systems from attacking newly implanted hearts, livers, kidneys or lungs, which the body sees as foreign.

But new research at Washington University School of Medicine in St. Louis suggests that broadly dampening the immune response, long considered crucial to transplant success, may encourage lung transplant rejection.

In a surprising discovery, the researchers found that newly transplanted lungs in mice were more likely to be rejected if key immune cells were missing, a situation that simulates what happens when patients take immunosuppressive drugs.

These long-lived memory T cells are primed to "remember" pathogens that infiltrate the body and quickly trigger an immune response during subsequent encounters. In heart, liver and kidney transplants, knocking down memory T cells with immunosuppressive drugs helps to ensure that the immune system recognizes a new organ as the body's own.

But not so in lung transplants, according to the new research published online Feb. 24 in the Journal of Clinical Investigation.

"In mice, memory T cells are critical for a lung transplant to have a good outcome," said co-corresponding author Daniel Kreisel, MD, PhD, a Washington University lung transplant surgeon at Barnes-Jewish Hospital. "A lot of transplant recipients receive drugs that indiscriminately deplete many different T cells. But in lung transplants, this strategy may contribute to organ rejection."

In light of the new findings, the researchers think current immune-suppression strategies should be re-evaluated in lung transplantation.

"Most immunosuppressive drugs were adopted for use in lung transplants based on their results in other solid organ transplants, without an appreciation that the lung is different," Kreisel said.

The research also may help explain, in part, why the success of lung transplants in people
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Contact: Caroline Arbanas
arbanasc@wustl.edu
314-286-0109
Washington University School of Medicine
Source:Eurekalert  

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