A protein found in immune cells may be a reliable marker for schizophrenia risk, report scientists in a new proteomics study appearing in the recent issue of Molecular and Cellular proteomics.

Schizophrenia is a severe and complex psychiatric illness that affects about 1% of the population. Diagnosis currently relies on subjective clinical interviews and the assessment of ambiguous symptoms, which frequently leads to delayed diagnosis and therapy. As such, biomarkers that would indicate schizophrenia risk or onset would be extremely useful.

Sabine Bahn and his colleagues sought to find such a "protein fingerprint" in the blood (due to its accessibility). They compared protein profiles of schizophrenia patients and controls using mass spectrometry and identified two peaks highlighting a significant change. These were identified as alpha defensins, proteins responsible for killing microbes and viruses in the innate immune response.

Bahn and his colleagues confirmed their findings by examining alpha defensin levels in the blood of 21 twin pairs discordant for schizophrenia (where one sibling manifests the disease while the other does not). In these twin sets, both siblings had significantly elevated alpha defensins as compared with a group of control twins. Changes were also found in patients who were investigated soon after diagnosis, which means that higher levels of alpha defensins were not caused by medicine or progression of the disease.

Because both discordant twins had elevated alpha defensins, these proteins do not indicate disease onset, but the scientists suggest they could be a useful and simple marker for evaluating schizophrenia risk. Eventhough they think that more markers will be needed in order to develop a sensitive and specific schizophrenia blood test.


Posted by: Emily    Source

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