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Why antidepressants don't work for so many
Date:10/23/2009

ey aim to boost neurotransmitters based on the popular molecular explanation of depression, which is that it's the result of decreased levels of the neurotransmitters serotonin, norepinephrine and dopamine. But that's wrong, Redei said.

Drugs Aim at Wrong Molecular Target

In the second part of the study, Redei found strong indications that depression actually begins further up in the chain of events in the brain. The biochemical events that ultimately result in depression actually start in the development and functioning of neurons.

"The medications have been focusing on the effect, not the cause," she said. "That's why it takes so long for them to work and why they aren't effective for so many people."

Her animal model of depression did not show dramatic differences in the levels of genes controlling neurotransmitters functions. "If depression was related to neurotransmitter activity, we would have seen that," she said.

Similarities Between Human and Rodent Brains

Her findings in depressed rats, she said, are very likely applicable to humans.

"The similarities between these regions of the human and rodent brain are remarkable," Redei explained. "The hippocampus and amygdala are part of the so-called ancient lizard brain that controls survival and are the same in even primitive organisms."


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Contact: Marla Paul
Marla-Paul@northwestern.edu
312-503-8928
Northwestern University
Source:Eurekalert

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