Effect of proline-containing oligopeptides on the behavior of outbred ICR mice in the Forced Swim Test

The effect of proline-containing oligopeptides N-Ac-DSer-Pro-DArg-Gly-NH2 (B-4), N-Ac-Trp-Pro-Arg-Gly-NH2 (B-5), N-Ac-Tyr-Pro-Arg-Gly-NH2 (B-7), and Pro-Gly on the behavior of male ICR mice in the Forced Swim Test was studied. N-Ac-DSer-Pro-DArg-Gly-NH2 (1.0 mcg/kg, i.n) increased the intensity of active swimming, most pronounced – during the last 2 minutes of testing (maximum fatigue period), i.e., it prevented the behavior of “despair”.