Effects of Specific Inhibitor of Phosphodiesterase 7 at the Late Stage of Long-Term Potentiation in Murine Hippocampal Slices.

Second messengers cAMP and cGMP play an important role in synaptic plasticity and memory consolidation. The inhibitors of phosphodiesterases, enzymes hydrolyzing these cyclic nucleotides, are actively studied as potential drugs for the treatment of various cognitive disorders and depression. We studied the effects of a new inhibitor of phosphodiesterase 7 AGF2.20 on the formation of long-term potentiation in hippocampal slices. Administration of AGF2.20 (10 nM) in 90 min after weak tetanization prevented a decrease in the amplitude of excitatory post-synaptic potentials and stabilized long-term potentiation. These data attest to the involvement of phosphodiesterase 7 in the development of synaptic plasticity in the hippocampus. The inhibitor AGF2.20 is considered for the further analysis as a promising substance for the treatment of cognitive impairments.

[Mathematical modeling of calcium incurrent flow in a somatic membrane during an action potential]. / Matematicheskoe modelirovanie kal'tsievogo vkhodiashchego toka v somaticheskoi membrane vo vremia potentsiala deistviia.

The application of modified Hodgkin -- Huxley equations to the description of transmembrane ionic currents when the action potential is generated in the somatic membrane of mullusc giant neurons is described. The input currents were divided on sodium and calcium components. The results of calculations were compared with the experimental data. An observed discrepancy between predicted and experimental action potentials is explained. Using the corrections proposed the results of calculations well agree with the experimental results.