Blocking a serotonin receptor subtype induces fast-acting antidepressant effects in mice, say researchers. Findings indicate a potential new class of therapeutics for depression.
![New Class of Fast-acting Antidepressant Discovered New Class of Fast-acting Antidepressant Discovered](https://www.medindia.net/afp/images/Health-US-medicine-psychology-141516.jpg)
Delayed onset of antidepressant therapeutics can significantly impact patients, especially those with major depressive disorder, who often spend months switching between ineffective medications. Currently, only two drugs—ketamine and scopolamine—exhibit rapid onset. Due to severe side effects, however, neither is suitable for human use.
In seeking a new class of fast-acting therapeutics, Dulawa and her team tested biological pathways that had previously been shown to generate antidepressant effects but had never been studied for rate of onset. They looked at different subtypes of serotonin receptors, proteins that are binding partners for serotonin, a neurotransmitter that has been shown to regulate mood, memory and appetite.
Of these subtypes, serotonin 2C receptors stood out. Selectively blocking these receptors in mice significantly reduced depression-like behaviors in only five days, compared to a minimum of two weeks for a control antidepressant medication.
"We observed fast-acting therapeutic effects in multiple behavioral tasks after we administered compounds that selectively block serotonin 2C receptors," said Mark Opal, a graduate student at the University of Chicago and lead author of the paper. "We began our measurements at five days, but we think there's a possibility it could be effective even sooner than that."
Serotonin 2C receptors normally inhibit the release of dopamine, another neurotransmitter commonly associated with mood, from certain neurons. When 2C is blocked, the researchers believe, more dopamine is released into regions of the brain such as the prefrontal cortex. The team also observed the induction of biomarkers that indicate antidepressant action.
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"One of the primary advantages to our discovery is that this is much more of an innocuous target than others that have been identified," Dulawa said.
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