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Compound enhances SSRI antidepressant's effects in mice
Date:6/21/2013

SAN ANTONIO (June 20, 2013) A synthetic compound is able to turn off "secondary" vacuum cleaners in the brain that take up serotonin, resulting in the "happy" chemical being more plentiful, scientists from the School of Medicine at The University of Texas Health Science Center San Antonio have discovered. Their study, released June 18 by The Journal of Neuroscience, points to novel targets to treat depression.

Serotonin, a neurotransmitter that carries chemical signals, is associated with feelings of wellness. Selective serotonin reuptake inhibitors (SSRIs) are commonly prescribed antidepressants that block a specific "vacuum cleaner" for serotonin (the serotonin transporter, or SERT) from taking up serotonin, resulting in more supply of the neurotransmitter in circulation in the extracellular fluid of the brain.

Delicate balance

"Serotonin is released by neurons in the brain," said Lyn Daws, Ph.D., professor of physiology and pharmacology in the School of Medicine. "Too much or too little may be a bad thing. It is thought that having too little serotonin is linked to depression. That's why we think Prozac-type drugs (SSRIs) work, by stopping the serotonin transporter from taking up serotonin from extracellular fluid in the brain."

A problem with SSRIs is that many depressed patients experience modest or no therapeutic benefit. It turns out that, while SSRIs block the activity of the serotonin transporter, they don't block other "vacuum cleaners." "Until now we did not appreciate the presence of backup cleaners for serotonin," Dr. Daws said. "We were not the first to show their presence in the brain, but we were among the first show that they were limiting the ability of the SSRIs to increase serotonin signaling in the brain. The study described in this new paper is the first demonstration of enhancing the anti
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Contact: Will Sansom
sansom@uthscsa.edu
210-567-2579
University of Texas Health Science Center at San Antonio
Source:Eurekalert

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