Abstract
One of the leading neurobiological hypotheses on depression states that decreased expression of brain-derived neurotrophic factor (BDNF) contributes to depression. This is supported by consistent findings of low serum BDNF levels in depressed patients compared with non-depressed controls. Whereas it has been generally assumed that this is a state characteristic of depression, strong inferences about state or trait effects require a longitudinal study design. To investigate the longitudinal association between serum BDNF and depression, we measured serum BDNF, (current and past) depression status, use of antidepressants, and all potential covariates at baseline and after 2 years in 1751 individuals, consisting of patients with an incident (n=153), remitted (n=420) and persistent depression (n=310) and non-depressed controls (n=868). We analyzed change/differences in serum BDNF across these four groups with analyses of covariance adjusted for covariates and baseline BDNF value, together with the effects of starting and stopping antidepressant treatment. Our analyses revealed a significant difference for the depression course groups (P=0.007). Compared with non-depressed controls, persistently depressed and remitted patients had a steeper decrease of BDNF levels over time (−1.33 (P=0.001) and −0.97 ng ml−1 (P=0.011), respectively), whereas BDNF reductions in patients with incident depression were similar to those in healthy controls. Initiation or discontinuation of antidepressants was not associated with BDNF change (P=0.72). These findings suggest that BDNF not only contributes to depression, but that depression in turn may also contribute to low BDNF.
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Acknowledgements
The BDNF measurements were financed by a Clinical Fellowship from the NWO (Netherlands Organisation for Scientific Research; project number 90700231) awarded to Richard C. Oude Voshaar, MD, PhD and a VIDI-grant from the NWO (grant nr. 016.085.353) awarded to Bernet M. Elzinga, PhD.
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Bus, B., Molendijk, M., Tendolkar, I. et al. Chronic depression is associated with a pronounced decrease in serum brain-derived neurotrophic factor over time. Mol Psychiatry 20, 602–608 (2015). https://doi.org/10.1038/mp.2014.83
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DOI: https://doi.org/10.1038/mp.2014.83
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