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Monday, February 6, 2012

How can an infection cause a mental illness?

How can an infection cause a mental illness? It's an autoimmune issue. Mady Hornig at Columbia University has a mouse model that shows how it works. They give strep to mice, then give them another agent that breaks down the blood–brain barrier, and that induces a neuropsychiatric syndrome: the mice have trouble running mazes, and so on. Then they purify the antibodies from those mice, inject them in another mouse that never had strep, and that mouse gets the neuropsychiatric symptoms, too. That shows it's the antibodies doing the damage.

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