Abstract—We used the radioligand binding method to study the neuroreceptor profile in the brain structures of subpopulations of outbred CD-1 mice that differ in stability of attention to environmental objects in the enriched closed plus maze test. In the prefrontal cortex of the subpopulation of mice with low attention to new objects, the density (Bmax, fmol/mg of protein) of D2-dopamine receptors was 25% higher whereas the density of GABAB-receptors was 34% lower compared to the mice with normal attention. We did not find any significant differences in the Kd and Bmax indices in the binding with NMDA-receptors in the hippocampus and prefrontal cortex between the subpopulations of mice. We additionally examined mouse behavior in the enriched closed plus maze and elevated plus maze tests using correlation and factor analysis. The index of attention to objects of the enriched closed plus maze correlated and had significant factor load with the indices of exploratory activity, such as time in center and amount of rearing in the elevated plus maze but did not correlate with anxiety indices.
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This study was performed in accordance with the state assignment of the Ministry of Education and Science of the Russian Federation, no. 0521-2019-0009.
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Ethical approval. The organization of the experiments corresponded to the ethical norms regulating experiments in animals suggested in the European Convention for the protection of vertebrates used for experiments or for other scientific purposes, EST no. 123, March 18, 1986, Strasbourg and the “Rules of good laboratory practice”, approved by the order of the Ministry of health of the Russian Federation no. 199n, April 1, 2016).
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Kovalev, G.I., Salimov, R.M., Sukhorukova, N.A. et al. Neuroreceptor Profile and Behavior of CD-1 Mice Subpopulations with Different Attention Stability. Neurochem. J. 14, 13–19 (2020). https://doi.org/10.1134/S1819712420010146
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DOI: https://doi.org/10.1134/S1819712420010146