Blood test for efficacy of antidepressants in the future?

Scientists have found that a biomarker for depression could show whether a person's antidepressant is working. The discovery could lead to something everyone in the psych world has been waiting for: a blood test of some kind.

The researchers looked at the interaction of neurotransmitters and a protein called Gs alpha. In brain cells, the protein acts like a kind of butler, passing messages from neurotransmitters on the outside and amplifying their messages, [study co-author Mark] Rasenick explained.

When the protein is working properly, it's like a butler whose "hands are just flying, cooking and cleaning at the same time," he said. But when the brain is depressed, "it just sits there in the corner."

That's an interesting observation. This might finally explain the difference between "depressed" brain activity and normal brain activity on an MRI. (By the way, has anyone had an MRI performed for depression?)

Researchers compared the proteins in the brains of people who committed suicide as a result of depression to those who did not. "They found the protein would have worked less effectively in the brain cells of the suicide victims."

Dr. Gregory Simon conceded that doctors cannot determine which antidepressant will work for which person.

"There's a long history of research using patterns of symptoms or biological measures — chemicals measured in blood or spinal fluid — to predict response to a particular antidepressant. None of those hoped-for predictors have significant value.

[Genetic tests] would not eliminate trial-and-error, but it would reduce the waiting time with each trial. But it's a long way from a study like this one to a test that's useful to patients and doctors."

Good news for the skeptics about this research study: It was funded by the U.S. Public Health Service and the American Foundation for Suicide Prevention. But a test simply to see if an antidepressant is working has the smell of pharma somewhere on it.

(Hat tip: Ephphatha)

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