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CNS & Neurological Disorders - Drug Targets

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ISSN (Online): 1996-3181

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General Research Article

Neurokinin-1 Receptor Antagonist Reverses Functional CNS Alteration Caused by Combined γ-rays and Carbon Nuclei Irradiation

Author(s): Viktor S. Kokhan, Sofia Mariasina, Vladimir A. Pikalov, Denis A. Abaimov, Siva G. Somasundaram , Cecil E. Kirkland and Gjumrakch Aliev*

Volume 21, Issue 3, 2022

Published on: 26 November, 2021

Page: [278 - 289] Pages: 12

DOI: 10.2174/1871527320666210122092330

Price: $65

Abstract

Background: Ionizing Radiation (IR) is one of the major limiting factors for human deep-space missions. Preventing IR-induced cognitive alterations in astronauts is a critical success factor. It has been shown that cognitive alterations in rodents can be inferred by alterations of a psycho- emotional balance, primarily an anxiogenic effect of IR. In our recent work, we hypothesized that the neurokinin-1 (NK1) receptor might be instrumental for such alterations.

Objective: The NK1 receptor antagonist rolapitant and the classic anxiolytic diazepam (as a comparison drug) were selected to test this hypothesis on Wistar rats.

Methods: Pharmacological substances were administered through intragastric probes. We used a battery of tests for a comprehensive ethological analysis. High-performance liquid chromatography was applied to quantify monoamines content. An analysis of mRNA expression was performed by real-time PCR. Protein content was studied by the Western blotting technique.

Results: Our salient finding includes no substantial changes in anxiety, locomotor activity and cognitive abilities of treated rats under irradiation. No differences were found in the content of monoamines. We discovered a synchronous effect on mRNA expression and protein content of 5- HT2a and 5-HT4 receptors in the prefrontal cortex, as well as decreased content of serotonin transporter and increased content of tryptophan hydroxylase in the hypothalamus of irradiated rats. Rolapitant affected the protein amount of a number of serotonin receptors in the amygdala of irradiated rats.

Conclusion: Rolapitant may be the first atypical radioprotector, providing symptomatic treatment of CNS functional disorders in astronauts caused by IR.

Keywords: Ionizing radiation, neurokinin-1 receptor, anxiety, monoamines, serotonin, radioprotector, rolapitant, diazepam

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