Antidepressant properties of Proproten (antibodies to S100 protein in ultralow doses) were studied on outbred albino rats. The animals were subjected to the Porsolt's test of behavioral helplessness and Nomura's test of forced swimming in a reservoir with freely rotating wheels. Proproten in a dose of 2.5 ml/kg produced a strong antidepressant effect. It was observed after single and repeated (5 days) peroral treatment with the preparation. Proproten decreased the immobility time (Porsolt's test) and increased the number of wheel turns (Nomura's test). The activity of Proproten compared well with the standard preparation amitriptyline. As differentiated from amitriptyline, Proproten did not produce the sedative effect.
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