[Vascular endothelial growth factor (VEGF) as a potential biomarker in major depressive disorder]

There is growing evidence that vascular endothelial growth factor (VEGF) plays a crucial role in neurodevelopment and regeneration. Several data support that intact VEGF pathway is indispensable for therapeutic effect of antidepressants, any disruption of VEGF signaling can result treatment resistance. In our study we investigated the peripherial blood VEGF level before and 4-week after antidepressant treatment in patients with major depressive episode and we compared VEGF levels between responders and non-responders.

We recruited 34 patients diagnosed with major depression disorder rom our department. Depressive symptoms were followed by the Montgomery Asberg Depression Scale. Level of VEGF was measured from peripheral plasma by ELISA technic. For comparisons we performed general linear models and Mann-Whitney U tests.

Baseline VEGF level was significantly higher in the non-responder subgroup compared to responders (p=0.017). In regression analyses the baseline and end-point VEGF levels were correlated with end-point MADRS (p=0.03; p=0.02, respectively). In our sample the higher baseline VEGF level was correlated with 2.75 times greater chance for treatment resistance in non-responders compared to responders.

Our results confirm the significant role of VEGF signaling in the pathomechanism of major depression disorder. These data suggest that high baseline VEGF level can be a predictor for lack of therapy response, thus VEGF can be regarded as a potential biomarker for treatment resistance in major depression disorder.