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Patent pending for pain-free method of monitoring drug levels in transplant patients
Date:4/3/2009

KINGSTON, R.I. March 27, 2009 The U.S. Patent and Trademark Office is reviewing a University of Rhode Island pharmacy professor's proposal to use saliva as a non-invasive way to monitor concentrations of anti-rejection drugs in patients that undergo transplants.

Associate Professor of Pharmacy Fatemeh Akhlaghi said saliva offers a pain-free way to measure levels of immunosuppressive agents such as cyclosporine, and mycophenolic acid, which are essential in preventing organ rejection after transplantation. She is also researching the use of saliva for monitoring the concentration of two other immunosuppressive drugs, tacrolimus and sirolimus.

"Routine concentration measurement for these agents is essential for their efficacious and safe use. This is currently done through blood tests that are usually administered twice a week in a clinic or hospital," Akhlaghi said. "Our method uses saliva to measure these drug levels. Saliva tests are good for children and elderly. With the elderly, blood draws can be difficult because of the loss of muscle and connective tissue, making the veins less stable and more prone to bruising."

Frequent testing of medication levels in transplant patients is required for two reasons; if the concentration of an immunosuppressive agent is low, the patient risks rejection of the organ, and if the concentrations are high, the patient risks infections and toxicity.

"We seek commercial partners to allow us to expand the clinical studies, optimize the sample collection procedure and investigate the possibility of developing non-mass spectrometry methods for this application," Akhlaghi said.

Mass spectrometry is an instrumental method for identifying the chemistry of a substance through the separation of gaseous ions based on their differing mass and charge. Akhlaghi's method is less complicated and less expensive.

"This method is very effective for the drugs listed in my study," Akhlaghi
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Contact: David Lavallee
dlavallee@advance.uri.edu
401-874-2116
University of Rhode Island
Source:Eurekalert

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