Abstract
Stressing events in the early period of life affect neuronal plasticity and cognitive functions in adulthood. A key role in the mechanisms of formation of memory and attention is played by the glutamatergic system. However, there has been virtually no systematic study on the effect of early postnatal stress on the expression of glutamatergic system genes in various regions of the brain in mice. In this study, we used two types of early postnatal stress: prolonged separation of pups from mothers (for 3 hours per day) and shortterm separation (15 minutes per day) during the first 2 weeks of life. We used an object recognition test to evaluate attention and memory to assess cognitive abilities in adults. We found that prolonged maternal separation reduced the ability to recognize a novel object and also disrupted motor and exploratory activities in adult animals, while short-term separation did not affect the studied parameters. We assessed the expression of the major genes of the glutamatergic system (AMPA receptor subunits Gria1, Gria2; NMDA subunits Grin1, Grin2a, and Grin2b; metabotropic receptor subunits Grm1, Grm2, and Grm3; glutamate transporters Vglut2, Eaat2, and Rab4a) in the frontal cortex, hippocampus, and hypothalamus. In the group with prolonged maternal separation, we found a decrease in the expression of Grin2b in the hypothalamus in comparison with the control, which led to a decrease in the mRNA ratio of this subunit to Grin2a mRNA, and possibly to a change in the ratio of these subunits in the NMDA receptor. In spite of the revealed cognitive impairments, we did not find significant changes in the expression of genes in the frontal cortex and hippocampus. Shortterm daily separation from mothers did not lead to changes in cognitive abilities and expression of genes of the glutamatergic system in mice. Thus, our results show that prolonged maternal separation may lead to a redistribution of the receptor subunits in the hypothalamus, which can modify the activity of the HPAA and determine the response to stress in these mice.
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Abbreviations
- PND:
-
postnatal day
- HD:
-
handling (short-term maternal separation)
- MS:
-
maternal separation (long-term maternal separation)
- NC:
-
normal conditions
- AMPA:
-
a-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor
- NMDA:
-
N-methyl-D-aspartate receptor.
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Original Russian Text © V.V. Reshetnikov, A.A. Lepeshko, Yu.A. Ryabushkina, A.A. Studenikina, T.I. Merkulova, N.P. Bondar, 2018, published in Neirokhimiya, 2018, Vol. 35, No. 2, pp. 140–150.
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Reshetnikov, V.V., Lepeshko, A.A., Ryabushkina, Y.A. et al. The Long-Term Effects of Early Postnatal Stress on Cognitive Abilities and Expression of Genes of the Glutamatergic System in Mice. Neurochem. J. 12, 142–151 (2018). https://doi.org/10.1134/S1819712418020095
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DOI: https://doi.org/10.1134/S1819712418020095