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Genetic difference predicts antidepressant response
Date:1/23/2008

by P-gpthat the antidepressants were thus substrates of the transporter.

Studying 443 patients on the antidepressants, they next searched for variants in the human gene that correlated with reduced efficacy of the drugs. Their genetic analysis identified 11 such variants.

To our knowledge, our results provide for the first time evidence that genetic variants in the [gene for P-gp] account for differences in the clinical efficacy of antidepressants, most likely by influencing their access to the brain, they wrote.

The general conclusion to be drawn is that any drug administered to treat CNS diseases should be analyzed for its P-gp substrate status, which can be determined by using knockout mice. From a clinical point of view, the findings warrant that patients receiving a drug that is a P-gp substrate for the treatment of brain diseases are genotyped to exclude the possibility that a patient receives a drug that fails to enter the CNS to an extent required for efficacy.

The researchers also suggested that development of future antidepressants should take into account whether the candidate drugs are transported by P-gp. And, clinical trials of antidepressants should be designed to take into account the P-gp genetic status of patients in the trial.


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Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

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