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Knijff, E.M. et al.

Knijff, Ruwhof, de Wit, Kupka, Vonk, Akkerhuis, Nolen, Drexhage,

Monocyte-derived dendritic cells in bipolar disorder.

BACKGROUND: Dendritic cells (DC) are key regulators of the immune system, which is compromised in patients with bipolar disorder. We sought to study monocyte-derived DC in bipolar disorder. METHODS: Monocytes purified from blood collected from DSM-IV bipolar disorder outpatients (n = 53, 12 without lithium treatment) and healthy individuals (n = 34) were differentiated into DC via standard granulocyte-macrophpage colony-stimulating factor/interleukin-4 culture (with/without 1, 5, and 10 mmol/L lithium chloride). The DC were analyzed for DC-specific and functional markers and for T-cell stimulatory potency. RESULTS: Monocytes of bipolar patients showed a mild hampering in their differentiation into fully active DC, showing a weak residual expression of the monocyte marker CD14 and a relatively low potency to stimulate autologous T cells. Lithium treatment abolished this mild defect, and monocyte-derived DC of treated bipolar patients showed signs of activation (i.e., an up-regulated potency to stimulate autologous T cells and a higher expression of the DC-specific marker CD1a). This activated phenotype contrasted with the suppressed phenotype of monocyte-derived DC exposed to lithium in vitro (10 mmol/L) during culture. CONCLUSIONS: Dendritic cells show mild aberrancies in bipolar disorder that are fully restored to even activation after in vivo lithium treatment.[1]

References

Monocyte-derived dendritic cells in bipolar disorder. Knijff, E.M., Ruwhof, C., de Wit, H.J., Kupka, R.W., Vonk, R., Akkerhuis, G.W., Nolen, W.A., Drexhage, H.A. Biol. Psychiatry (2006) [Pubmed]

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