The role of actin depolymerization in the mechanisms of ltp consolidation
- Authors: Kudryashova I.V.1
-
Affiliations:
- Institute of Higher Nervous Activity and Neurophysiology RAS
- Issue: Vol 75, No 5 (2025)
- Pages: 597-611
- Section: ФИЗИОЛОГИЧЕСКИЕ МЕХАНИЗМЫ ПОВЕДЕНИЯ ЖИВОТНЫХ: ВОСПРИЯТИЕ ВНЕШНИХ СТИМУЛОВ, ДВИГАТЕЛЬНАЯ АКТИВНОСТЬ, ОБУЧЕНИЕ И ПАМЯТЬ
- URL: https://journals.rcsi.science/0044-4677/article/view/320690
- DOI: https://doi.org/10.31857/S0044467725050083
- ID: 320690
Cite item
Abstract
The change of CA1 LTP profile in response to high frequency stimulation of Schaffer collaterals after inhibition of actin depolymerization was studied in the rat hippocampal slices. For this purpose before tetanization the slices of experimental group were subjected to inhibitor of actin depolymerization jasplakinolide. To prevent additional activation of actin polymerization during LTP maintenance jasplakinolide infusion stopped 15 minutes after tetanization. In was supposed that the blockade of actin polymerization would prevent consolidation of long-term synaptic plasticity. The mean percentage of posttetanic amplitude increase 1 hour after tetanization with jasplakinolide was significantly less compared to control group. However decreased level of early LTP does not allow to relate this effect directly to impairment of LTP consolidation. To detect specific for consolidation jasplakinolide effects correlation analysis was performed or transformed variables, excluding the contribution of the factor of eLTP magnitude, were compared. It was found that under the same, including high, level of eLTP quite usual after tetanization 100 Hz 1 s depotentiation, was absent in the experimental, but not in the control group. This may indicate improved LTP maintenance, while decreased magnitude compared to control. According to other independent on different eLTP indices LTP maintenance at least was not impaired. The results do not confirm, although they do not disprove the hypothesis of actin depolymerization as a key factor of LTP consolidation. It is supposed that under blockade of actin depolymerization LTP maintenance may be mediated by the local protein synthesis in the dendrites.
About the authors
I. V. Kudryashova
Institute of Higher Nervous Activity and Neurophysiology RAS
Author for correspondence.
Email: iv_kudryashova@mail.ru
Moscow, Russia
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