Abstract
We investigated the role of ghrelin and its receptors in the manifestation of gambling addiction elements in rats exposed to early psychogenic stress. Rearing in conditions of social isolation or maternal deprivation in early ontogeny increased risk behavior and impulsivity in the Iowa Gambling Task test: animals sought more food reinforcement, but with a low probability. Maternal deprivation or rearing in social isolation increased expression of Ghsr in the amygdala and hypothalamus respectively. The level of expression of the gene under study in the prefrontal cortex did not change. It is concluded that early psychogenic stress causes an imbalance in the brain ghrelin regulatory system, which manifests itself in increased of Ghsr level as well as elements of gambling addiction. The scheme of the effect of chronic stress on the hypothalamic ghrelin system and on the extrahypothalamic regulation of ghrelin is presented.
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Funding
The work was performed within the framework of the state task of the Ministry of Education and Science of Russia (2022–2025). “Search for molecular targets for pharmacological action in addictive and neuroendocrine disorders and creation of new pharmacologically active substances acting on CNS receptors,” code FGWG-2022-0004.
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A.A.L.—idea of work, planning the experiment, discussion, writing and editing the article. S.S.P.—collecting data in the experiment, data processing, writing and editing the article. E.A.S.—collecting data in the experiment, processing the data, performing PCR analysis. B.A.R.—creating a scheme of stress action, discussing the data obtained. E.R.B.- statistical processing of data, writing and editing the article. P.D.Sh.—general management, discussion, writing and editing of the article.
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The experiments were conducted in accordance with the ethical principles outlined in Directive 2010/63/EC of the European Parliament and the Council of the European Union of September 22, 2010, and approved by the Bioethics Commission of FGBNU “Institute of Experimental Medicine.”
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The authors declare that they have no conflicts of interest.
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Translated by A. Dyomina
Russian Text © The Author(s), 2023, published in Rossiiskii Fiziologicheskii Zhurnal imeni I.M. Sechenova, 2023, Vol. 109, No. 8, pp. 1080–1093https://doi.org/10.31857/S086981392308006X.
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Lebedev, A.A., Purveev, S.S., Sexte, E.A. et al. Studying the Involvement of Ghrelin in the Mechanism of Gambling Addiction in Rats after Exposure to Psychogenic Stressors in Early Ontogenesis. J Evol Biochem Phys 59, 1402–1413 (2023). https://doi.org/10.1134/S1234567823040316
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DOI: https://doi.org/10.1134/S1234567823040316