Discovery of biomarkers for evaluation of efficacy of psychopharmacotherapy is important task.

To study parameters characteristic for albumin binding sited in melancholic depression (MD) using fluorescent laser spectroscopy in range of 30–50 picoseconds.

22 patients with MD (dep) (F33.1 and 2) were investigated in dynamics of antidepressant therapy (venlafaxine: 75–150 mg/daily) for 30 days. Control group (con) consists of 54 volunteers. Decay of fluorescence amplitude (A) of fluorescent probe K-35 from serum albumin was measured using laser. Earlier, we revealed 3 binding sites in albumin with amplitudes A1, A2 and A3 with decay time of 1, 3 and 9 nanoseconds, respectively.

There was revealed significant decrease of amplitude A1dep, normalized on mean value of A1 for controls (A1dep/A1con), for patients with MD after treatment with venlafaxine. In this case, A1depvalues decreased and were equal to A1 values of controls (P < 0.01): A1dep/A1con before treatment–1.23 and after 30 days of therapy–0.97 relative units; for controls this value was–1.00 relative units. The same type of normalization was observed for amplitudes A2 and A3 of melancholic patients. There were revealed significant changes of A3/A1 ratio that points out on conformational changes of serum albumin molecule in dynamics of venlafaxine therapy.

We have registered unidirectional changes in albumin molecule in patients with MD. Investigated parameters can serve as potential biomarkers for evaluation of efficacy of psychopharmacotherapy.

The authors have not supplied their declaration of competing interest.