Premium
Effects of repeated electroconvulsive seizure on cell proliferation in the rat hippocampus
Author(s) -
Ito Masanobu,
Seki Tatsunori,
Liu Juan,
Nakamura Kyoko,
Namba Takashi,
Matsubara Yoichiro,
Suzuki Toshihito,
Arai Heii
Publication year - 2010
Publication title -
synapse
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.809
H-Index - 106
eISSN - 1098-2396
pISSN - 0887-4476
DOI - 10.1002/syn.20796
Subject(s) - dentate gyrus , subgranular zone , hippocampus , cell growth , electroconvulsive therapy , neuroscience , stimulation , cell , apoptosis , medicine , endocrinology , chemistry , pharmacology , biology , stem cell , neural stem cell , microbiology and biotechnology , electroconvulsive shock , biochemistry , subventricular zone
Electroconvulsive therapy (ECT) is known as a successful treatment for severe depression. Despite great efforts, the biological mechanisms underlying the beneficial effects of ECT remain largely unclear. In this study, animals received a single, 10, or 20 applications of electroconvulsive seizure (ECS), and then cell proliferation and apoptosis were investigated in the subgranular zone (SGZ) of the dentate gyrus. We analyzed whether a series of ECSs could induce changes in the dentate gyrus in a dose‐response fashion. A single‐ECS seizure significantly increased cell proliferation in the SGZ by ∼2.3‐fold compared to sham treatment. After 10 ECSs, a significant increase in cell proliferation was observed in the SGZ by ∼2.4‐fold compared to sham treatment. Moreover, 10 ECSs induced a significant increase in cell proliferation by 1.3‐fold compared to a single‐ECS group. However, cell proliferation did not differ between the group with 20 ECSs and sham group. In addition, a significant increase in the number of apoptotic cells was found in the group with 10 ECSs, whereas no significant change in it was found in either a single ECS or 20 ECSs group compared to sham treatment. These findings indicate that the optimal number of treatments and duration of stimulation requires investigation. Further studies are needed to elucidate the intracellular mechanisms underlying both effective and excessive ECT. Synapse 64:814–821, 2010. © 2010 Wiley‐Liss, Inc.