Abstract
Acute stress exposure triggers a cascade of neurochemical reactions, leading, specifically, to behavior changes and increased pain tolerance in humans and animals. ACTH/MSH-like peptides play an important role in regulating the organism’s response to stressful exposures. The aim of the present study was to assess the effects of the heptapeptide Semax, a synthetic ACTH4–10 analog, in various models of acute stress. The effect of intraperitoneal Semax administration at doses of 0.05 and 0.5 mg/kg on changes in behavior and pain sensitivity of Wistar rats was investigated in models of inescapable intermittent footshock stress and forced cold-water swim stress. To assess the involvement of the endogenous opioid system in the effects of stress, there was studied an impact of the preadministration with the opioid receptor antagonist Naloxone (1 mg/kg). The stressors used led to an increase in the pain threshold in the paw-pressure test, which indicates the development of stress-induced analgesia (SIA). In addition, rats exposed to stress showed decreased exploratory behavior and increased anxiety-like behavior in the hole board test. Both Semax and Naloxone attenuated SIA in the model of inescapable footshock stress, but did not affect pain threshold values in the model of forced cold-water swim stress. Both drugs did not affect rat behavior in the above models of acute stress. It can be concluded that Semax attenuates the opioid form of SIA, but does not affect behavior changes in rats exposed to acute stress.
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The work was funded by the Russian Science Foundation (RSF), Grant no. 19-14-00268, https://rscf.ru/project/22-14-35023/.
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Conceptualization and design of the experiments (N.G.L., A.A.K., L.V.D., S.A.L., N.F.M.); data collection (N.Yu.G., D.M.M., D.A.V., E.A.S., L.A.A.); data processing (N.Yu.G., D.M.M., D.A.V., E.A.S., N.G.L.); writing and editing the manuscript (N.G.L., N.Yu.G., D.M.M., E.A.S.).
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The study was carried out in compliance with bioethical standards for the treatment of experimental animals stated in the Rules of Good Laboratory Practice (Order of the Ministry of Health of the Russian Federation no. 199 of 01.04.2016), as well as the requirements of Directive 2010/63/EU of the European Parliament of 22.09.2010.
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Translated by A. Polyanovsky
Russian Text © The Author(s), 2023, published in Rossiiskii Fiziologicheskii Zhurnal imeni I.M. Sechenova, 2023, Vol. 109, No. 1, pp. 119–135https://doi.org/10.31857/S0869813923010053.
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Glazova, N.Y., Manchenko, D.M., Vilensky, D.A. et al. Effects of Semax in the Rat Models of Acute Stress. J Evol Biochem Phys 59, 200–212 (2023). https://doi.org/10.1134/S0022093023010179
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DOI: https://doi.org/10.1134/S0022093023010179