The effect of peptide bioregulators on the resistance of rats to cold-stress factor

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Abstract

BACKGROUND: Biologically active regulatory peptides are the drugs of new type that act selectively on targets, with having no significant side effects.

AIM: The aim of the study was to study the potential effect of peptide preparations Cortexin® and Semax® on the resistance of the rat organism to the cold stress factor in the model of cold stress maladaptation.

MATERIALS AND METHODS: White outbred male rats were injected intraperitoneally twice daily with placebo (n = 30), Cortexin® 5 mg/kg (n = 30) or Semax® 0.3 mg/kg (n = 30). Three days after the start of the injection course, the cold-stress effect was simulated in the climate chamber (Feutron, Germany) by cooling the air to 5°C at a relative humidity of 75–80%.

RESULTS: The use of RP significantly increased the duration of the rectal temperature plateau-period within 35°C (moderate hypothermia): in animals of the Cortexin® group from 10 days to 12 days, and in animals of the Semax® group, from 10 to 14 days. Cortexin® demonstrated moderate immunomodulatory properties, and Semax® had a more pronounced immunomodulatory effect. Both preparations showed a stress-protective effect. The use of regulatory peptides provided to delay the decrease in the rat general motor activity and exploratory behavior which develops under the influence of a simulated cold-stress factor. A slower rate of decrease in the swimming time of rats under the influence of regulatory peptides was registrated.

CONCLUSIONS: The meteoadaptogenic, stress-protective and nootropic effects of the regulatory peptides Cortexin® and Semax® were confirmed in rats on the model of cold-stress maladaptation.

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About the authors

Vyacheslav P. Ganapolsky

Kirov Military Medical Academy

Email: ganvp@mail.ru

MD, PhD, Dr. Sci. (Med.), Head of the Research Department of the Habitability, Research Center

Russian Federation, Saint Petersburg

Pavel V. Agafonov

Kirov Military Medical Academy

Author for correspondence.
Email: agafonov23@yandex.ru

MD, PhD, Cand. Sci. (Med.), Senior Lecturer at the Department of Military Field Therapy

Russian Federation, Saint Petersburg

Vyacheslav O. Matytsyn

Kirov Military Medical Academy; Academisian I.P. Pavlov First St. Petersburg State Medical University

Email: matitsin@list.ru

MD, PhD, Cand. Sci. (Med.), Senior Research Associate, Research Department of the Habitability, Research Center; Assistant Professor, Department of Normal Physiology

Russian Federation, Saint Petersburg; Saint Petersburg

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Supplementary files

Supplementary Files
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1. JATS XML
2. Fig. 1. General scheme of the experiment to assess the effect of peptide bioregulators on the resistance of rats to cold-stress factor

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3. Fig. 2. Dynamics of the level during the entire period of the experiment. *Statistically valid difference of rats parameters in Semax® group in comparison to similar parameters in the placebo group (p < 0.05). Arrows (↓) mark the end of temperature plato in the range below 35 °C in the Cortexin® and Semax® groups

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4. Fig. 3. Dynamics of the number of leukocytes in animals of their groups of placebo, Cortexin® and Semax® injections. *Statistically valid difference of rats parameters in comparison to similar parameters in the placebo group (p < 0.05)

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5. Fig. 4. Dynamics of serum cortisol level in rats in the groups of study drugs. *Statistically valid difference of rats parameters in comparison to similar parameters in the placebo group (p < 0.05)

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6. Fig. 5. Dynamics of the content of insulin in the blood serum of rats in the groups of study drugs.

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7. Fig. 6. Dynamics of the HSP-70 index in the blood serum of rats in the groups of study preparations. *Statistically valid difference of rats parameters in comparison to similar parameters in the placebo group (p < 0.05)

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8. Fig. 7. Dynamics of the content of HIF-1α in the blood serum of rats in the groups of study drugs. *Statistically valid difference of rats parameters in comparison to similar parameters in the placebo group (p < 0.05)

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