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SLU researchers see possible answer to chemo pain in a multiple sclerosis drug
Date:6/23/2014

ST. LOUIS In a recently published study in the Journal of Biological Chemistry, Saint Louis University professor of pharmacological and physiological sciences Daniela Salvemini, Ph.D. describes two discoveries: a molecular pathway by which a painful chemotherapy side effect happens and a drug that may be able to stop it.

"The chemotherapy drug paclitaxel is widely used to treat many forms of cancer, including breast, ovarian and lung cancers," said Salvemini. "Though it is highly effective, the medication, like many other chemotherapy drugs, frequently is accompanied by a debilitating side effect called chemotherapy induced peripheral neuropathy, or CIPN."

CIPN can appear as tingling or numbness in the hands and feet, shooting or burning pain in the limbs, or can feel like hot or cold temperature extremes. Symptoms may resolve within weeks or months of stopping the chemotherapy treatment or may last for years. In addition to causing patients suffering, CIPN is often a limiting factor when it comes to treatment.

Physicians estimate that CIPN can occur in 30 to 90 percent of patients treated with taxanes (the class of drugs that includes paclitaxel) and combination chemotherapies.

Salvemini and her colleagues studied paclitaxel, which also is known as Taxol, and discovered that the pain pathway (the series of interactions between molecular-level components) is dependent on activation of sphingosine 1-phosphate receptor subtype 1 (S1PR1) in the central nervous system by engaging a series of damaging neuro-inflammatory processes leading to pain. By inhibiting this molecule, they found that they could block and reverse paclitaxel-induced neuropathic pain without interfering with the drug's anticancer effects.

This finding is particularly encouraging because a drug that modulates S1PR1 is already on the market. A medication called FTY720 (Gilenya) is FDA-approved as a therapy for multiple sclerosis. When Salvemi
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Contact: Carrie Bebermeyer
bebermcl@slu.edu
314-977-8015
Saint Louis University
Source:Eurekalert

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