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Bipolar Disord. 2006 Jun;8(3):265-70.

Serum calcium-independent phospholipase A2 activity in bipolar affective disorder.

Author information

1
Northern Ontario School of Medicine, Lakehead University, Thunder Bay, ON, Canada. brian.ross@normed.ca

Abstract

OBJECTIVE:

Phospholipases A2 (PLA2) are a family of enzymes involved in membrane phospholipid metabolism and cell signalling. The gene encoding one form, type VI calcium-independent phospholipase A2, is located in a region of DNA that may contain a gene important in the aetiology of psychosis. Moreover, the activity of calcium-independent PLA2 is reported to be elevated in the blood and brain of patients with schizophrenia. In this study we determined whether a similar change takes place in patients with bipolar disorder with and without a history of psychosis.

METHODS:

Serum calcium-independent and -dependent PLA2 activities were determined in 24 patients with bipolar I disorder.

RESULTS:

Serum calcium-independent and -dependent PLA2 activities in bipolar cases did not differ significantly from that in healthy volunteers (HVs). However, calcium-independent PLA2 activity was significantly (p < 0.05) higher in patients with a history of psychosis compared with those with no history of psychosis (by 55%) or to HVs (by 31%).

CONCLUSIONS:

Our data suggest that a subset of bipolar I disorder patients with a history of psychosis have elevated calcium-independent PLA2 activity. Given that this enzyme activity is also increased in schizophrenia, elevated rates of phospholipid turnover mediated by the enzyme could represent a common biochemical feature of psychotic illness.

[Indexed for MEDLINE]

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