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Study uncovers why anti-rejection drugs for transplant patients cause hypertension
Date:10/7/2011

PORTLAND, Ore. Modern medicine's ability to save lives through organ transplantation has been revolutionized by the development of drugs that prevent the human body from rejecting the transplanted organ.

But those antirejection drugs have their own side effects sometimes serious.

A group of researchers led by scientists at Oregon Health & Science University has discovered the process that may be causing many of those side effects. And the discovery means those side effects likely can be dealt with cheaply and easily with a class of widely used drugs that are often avoided in patients with organ transplants.

The researchers' findings were published this week in the online edition of the journal Nature Medicine.

The researchers examined the effects of a class of antirejection or immunosuppressive drugs called calcineurin inhibitors, which includes cyclosporine and tacrolimus.

Calcineurin inhibitors, which can be instrumental in preventing organ rejection in transplant patients, also can cause hypertension and kidney problems. The researchers' findings reveal what ultimately causes those problems a calcineurin inhibitor spurs the production of an abnormally high level of a natural protein in the kidney.

Researchers found that a thiazide diuretic drug, which blocks the responsible protein, reduced hypertension in mice that had been given the calcineurin inhibitor. And mice lacking this protein did not develop hypertension at all.

The collaborative team of researchers, which included scientists from University College London, extended their observations to humans kidney transplant patients in the United Kingdom.

University College London scientists found that kidney transplant patients who received the calcineurin inhibitor were more sensitive to a thiazide diuretic than were patients treated with other antirejection drugs.

The research results could mean very good new
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Contact: Todd Murphy
murphyt@ohsu.edu
Oregon Health & Science University
Source:Eurekalert

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