Increased Sensitivity to Agonist Stimulation of the Ca2+ Response in Neutrophils of Manic-Depressive Patients: Effect of Lithium Therapy

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Abstract
The agonist-stimulated increase of intracellular free-Ca2+ concentration, an indicator of the sensitivity of the inositol phospholipid second-messenger generating system, was measured in neutrophils from patients with manic-depressive disorder, and controls. Dose-response curves of the calcium response were determined by measuring the fluorescence of neutrophils loaded with fura-2 and stimulated with various concentrations of the chemotactic tripeptide formylmethionylleucylphenylalanine. EC50 values were obtained for 14 medication-free patients (5 acutely depressive, and 9 symptom free remitted patients with a history of manic-depression or recurrent major depression), 9 lithium-treated, euthymic manic-depressive patients and 10 drug-free healthy controls. The EC50 values of the untreated patients were significantly lower than in the controls. Lithium-treated patients had EC50 values significantly higher than controls. These results suggest that manic-depressive disorder is associated with an increased sensitivity of the inositol phospholipid second-messenger generating system, which is counteracted by lithium treatment.

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