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Urine biomarker test can diagnose as well as predict rejection of transplanted kidneys
Date:7/3/2013

lleagues found that increased expression of three mRNAs can determine if an organ will be, or is being, rejected. The mRNAs (18S ribosomal (rRNA)normalized CD3ε mRNA, 18S rRNAnormalized interferon-inducible protein 10 (IP-10) mRNA, and 18S rRNA) indicate that killer T immune cells are being recruited to the kidney in order to destroy what the body has come to recognize as alien tissue.

The signature test consists of adding levels of the three mRNAs in urine into a composite score. Tracked over time, a rising score can indicate heightened immune system activity against a transplanted kidney, Dr. Suthanthiran says. A score that stays the same suggests that the patient is not at risk for rejection.

"We were always looking for the most parsimonious model for an organ rejection biomarker test," Dr. Suthanthiran says. "Minimizing the number of genes that we test for is just more practical and helps to give us a clearer path towards diagnosis and use in the clinic."

Physicians can tailor a patient's use of multiple immunosuppressive drugs by lowering the doses steadily, and monitoring the patient's composite score over time. Any increase would suggest a somewhat higher dose of therapy is needed to keep the organ safe.

"This is akin to monitoring blood glucose in a patient with diabetes," Dr. Suthanthiran says. "Because different people have different sensitivity to the two-to-four immunosuppressive drugs they have to take, this test offers us a very personalized approach to managing transplantations."

Predicting rejection weeks before it happens

The clinical trial began in 2006 with participation from five medical centers -- NewYork-Presbyterian/Columbia University Medical Center, the University of Pennsylvania's Perelman School of Medicine, the Northwestern University Feinberg School of Medicine, the University of Wisconsin School of Medicine and Public Health and NewYork-Presbyterian/Weill Cornell Medical Cent
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Contact: Linda Kamateh
lib9027@nyp.org
212-821-0560
Weill Cornell Medical College
Source:Eurekalert

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