The novel element in the mechanism of endogenous regulation of depressive-like states

It was shown previously that cyclo-prolylglycine, an endogenous neuropeptide, is a positive AMPA receptor modulator and is able to increase the content of BDNF in neurons. In the present work it was shown that cyclo-prolylglycine at a dose of 1 mg/kg with subchronic intraperitoneal administration reduces the time of animal immobility to passive control, from 167.6 to 83.6 s on the 12th day of the experiment using the model of learned helplessness in rats. That indicates the presence of antidepressant-like activity. The results of the study allow us to consider that cyclo-prolylglycine is a link in the physiological regulation of a depressive-like state.