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[The role of opioid system in peculiarities of anti-anxiety effect of peptide anxiolytic selank].
Peculiarities of the anxiolytic effects of selank (heptapeptide analog of taftsin) under reduced activity of opioid system upon acute administration of naloxone have been studied in BALB/C and C57BL/6 inbred mice with high and low levels of anxiety, with passive and active emotional stress reaction phenotypes in the open field (OF) test. Selank (0.25 mg/kg, i.p.) per se exhibited anxiolytic effect in BALB/C mice by increasing the general locomotor activity, with no effects on the behavior of C57BL/6 mice in the OF test. Naloxone (1.0 mg/kg, i.p.) per se evoked swift runaway in OF peripheral areas in BALB/C mice while "freezing" the reaction in C57BL/6 mice with active response to stress under the same conditions. Pretreatment with naloxone attenuated the sensitivity to selank in BALB/C mice whereas the response to anxiolytic effects of peptide was increased in C57BL/6 mice. The data obtained reveal a new target for selank in CNS and indicate significance of the activity of enkephalin-opioid system in individual sensitivity to selank.
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