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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Cerebrospinal fluid interleukin (IL)-6 in unipolar major depression.

BACKGROUND: Previous studies have suggested that regulation of the proinflammatory cytokine interleukin (IL)-6 is abnormal in patients with major depression. This study was undertaken to determine whether IL-6 concentrations in cerebrospinal fluid (CSF) differ between depressed patients and healthy control subjects. METHODS: Lumbar puncture with a standardized procedure was performed on 18 drug-free patients meeting DSM-IV criteria for unipolar major depression and 26 age- and sex-matched healthy volunteers. CSF was assayed for IL-6 using a quantitative 'sandwich' enzyme immunoassay technique. RESULTS: Mean+/-S.D. CSF IL-6 levels did not differ between depressed (2.2+/-1.0 pg/ml) and healthy control (2.4+/-1.9 pg/ml) subjects. LIMITATIONS: This study had adequate power (0.8) to detect a large (d=0.88) effect size at alpha = 0.05. Although sample sizes were comparable to or larger than those of previous CSF studies, it is possible that a less robust difference between depressed and healthy subjects was not detected. CONCLUSIONS: These findings fail to support speculation that immune activation may be causally involved in the pathogenesis of depression.[1]

References

  1. Cerebrospinal fluid interleukin (IL)-6 in unipolar major depression. Carpenter, L.L., Heninger, G.R., Malison, R.T., Tyrka, A.R., Price, L.H. Journal of affective disorders. (2004) [Pubmed]
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