Abstract
The effects of cryopreservation for different periods of time on the amplitudes of AMPA (α‑amino-3-hydroxy-5-methylisoxazole-4-propionic acid) and NMDA (N-methyl-D-aspartate) glutamatergic ionotropic mechanisms and the action potential of the lateral olfactory tract (AP LOT) at –20°C and subsequent warming to 37°C was studied. Experiments were performed on brain slices of 22 nonhibernating animals—Wistar rats. After cryopreservation, the glutamatergic ionotropic mechanisms were preserved and restored using electrophysiological recording of the AMPA and NMDA potentials and the total AP LOT. The AMPA-dependent mechanisms and the activity of conductive LOT fibers were restored to the normothermal values; the recovery of the NMDA-dependent mechanisms was incomplete and averaged 34% compared with the normothermal values; the long-term post-tetanic potentiation was not restored after cryopreservation.
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