Abstract
tDCS, a new, safe, non-invasive physical therapy method, is often used in motor dysfunction rehabilitation. However, the effects and underlying mechanisms of tDCS on hippocampal neurogenesis after cerebral ischemia (CI) are still unclear. This study aimed to investigate the promotive effect and mechanism of repetitive anodal-tDCS on hippocampal neurogenesis after CI in mice. The CI model in mice was established using bilateral common carotid artery occlusion (BCCAO). The pathological changes in the hippocampal CA1 region and cognitive function were assessed by hematoxylin and eosin staining and Morris water maze test, respectively. Hippocampal neurogenesis was observed by immunofluorescence staining. The levels of expression of ephrinb1, EPHB2, MAP-2, and NMDAR in the hippocampi were analyzed by qRT-PCR and Western blotting. Compared with the sham mice, the model mice showed significant neuronal damage in the hippocampal CA1 region (P < 0.01), cognitive dysfunction (P < 0.01), and endogenous hippocampal neurogenesis (P < 0.01). These results suggested that the CI model was successfully established, and that CI could promote endogenous hippocampal neurogenesis, but this hippocampal neurogenesis was unable to recover cognitive dysfunction. Compared with the model mice, the tDCS mice had ameliorated pathological damage in the CA1 region (P < 0.01), improved cognitive function (P < 0.01), increased hippocampal neurogenesis (P < 0.01), and increased mRNA and protein expression of ephrinb1, EPHB2, MAP-2, and NMDAR (P < 0.05). Repetitive anodal-tDCS can promote hippocampal neurogenesis and improve cognitive function in CI mice. The effect may be related to the activation of the ephrinb1/EPHB2/MAP-2/NMDAR signaling pathway.
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Abbreviations
- BCCAO:
-
Bilateral common carotid artery occlusion
- BrdU:
-
5-Bromo-2′-deoxyuridine
- CI:
-
Cerebral ischemia
- DCX:
-
Doublecortin
- DG:
-
Dentate gyrus
- Eph:
-
Erythropoietin-producing hepatocellular
- H&E:
-
Hematoxylin and eosin
- MAP-2:
-
Microtubule-associated protein 2
- MWM:
-
Morris water maze
- NMDA:
-
N-Methyl-d-aspartic acid
- NSC:
-
Neural stem cells
- SVZ:
-
Subventricular zone
- tDCS:
-
Transcranial direct current stimulation
- TMS:
-
Transcranial magnetic stimulation
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Funding
This study was supported by the National Natural Science Foundation of China The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by grants from the National Natural Science Foundation of China (Nos. 81871002, 81471334, 81100981), Pharmacy College of Chongqing Medical University (Nos. YXY2019SDTR01), and the Natural Science Foundation of Chongqing (No. cstc2017jcyjAX0211).
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HMQ, OMC and QSJ conceived and designed the experiment. XJM and HX performed the experiments. XJM, HX, and JXY analyzed the data. XJM and HMQ wrote the manuscript.
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Ma, X., Cheng, O., Jiang, Q. et al. Activation of ephrinb1/EPHB2/MAP-2/NMDAR Mediates Hippocampal Neurogenesis Promoted by Transcranial Direct Current Stimulation in Cerebral-Ischemic Mice. Neuromol Med 23, 521–530 (2021). https://doi.org/10.1007/s12017-021-08654-2
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DOI: https://doi.org/10.1007/s12017-021-08654-2