中国神经再生研究(英文版) ›› 2024, Vol. 19 ›› Issue (2): 425-433.doi: 10.4103/1673-5374.379048

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

调节海马CA1区和运动皮质M1中特定异常钙信号延缓颞叶癫痫的进展

  

  • 出版日期:2024-02-15 发布日期:2023-08-30

Regulation of specific abnormal calcium signals in the hippocampal CA1 and primary cortex M1 alleviates the progression of temporal lobe epilepsy

Feng Chen1, 2, #, Xi Dong1, 3, #, Zhenhuan Wang1, Tongrui Wu1, Liangpeng Wei1, 4, Yuanyuan Li5, Kai Zhang6, Zengguang Ma1, #br# Chao Tian1, Jing Li7, Jingyu Zhao1, Wei Zhang8, *, Aili Liu9, *, Hui Shen5, 9, * #br#   

  1. 1Laboratory of Neurobiology, School of Biomedical Engineering, Tianjin Medical University, Tianjin, China; 2Institute for Translational Neuroscience, the Second Affiliated Hospital of Nantong University, Nantong, Jiangsu Province, China; 3Institute for Translational Brain Research, Fudan University, Shanghai, China; 4Department of Radiology, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu Province, China; 5Innovative Institute of Chinese Medicine and Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan, China; 6Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin, China; 7Department of Orthopaedics, Tianjin Medical University General Hospital, Tianjin, China; 8Tianjin Eye Hospital, Tianjin Eye Institute, Tianjin Key Lab of Ophthalmology and Visual Science, Tianjin, China; 9Laboratory of Neurobiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
  • Online:2024-02-15 Published:2023-08-30
  • Contact: Hui Shen, MD, PhD, shenhui@tmu.edu.cn; Aili Liu, MS, liuaili6201@tmu.edu.cn; Wei Zhang, MD, PhD, zhangwei3067@163.com.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China, Nos. 62027812 (to HS), 81771470 (to HS), and 82101608 (to YL); Tianjin Postgraduate Research and Innovation Project, No. 2020YJSS122 (to XD).

摘要:

细胞内钙离子的动态变化被认为与诱发颞叶癫痫有关,而且对海马区钙离子的调节已被证明可以影响颞叶癫痫。然而,调节海马CA1区锥体神经元的钙离子活动对颞叶癫痫的影响尚不清楚,而且迄今为止还未见自由活动的颞叶癫痫小鼠中海马和大脑皮质的异常钙信号在多个脑区中传播情况。在此,实验使用多通道纤维测光系统连续记录颞叶癫痫海马CA1区和运动皮质M1的钙信号变化。结果发现:(1)使用化学遗传法抑制双侧CA1锥体神经元能缓解颞叶癫痫发作,使得不同等级颞叶癫痫发作的潜伏期延长、高等级颞叶癫痫发作概率降低、颞叶癫痫发作期间的死亡率下降,以及发作后的恢复率增高;同时,CA1区锥体神经元抑制还能改善CA1区和M1的钙稳态异常,能减少两个脑区与颞叶癫痫发作相关的异常钙信号。(2)颞叶癫痫 发作时CA1区与M1的钙信号具有一定同步性。颞叶癫痫发作时,无论是CA1和M1中所有神经细胞(包括所有神经元和胶质细胞)的钙信号,还是单独锥体神经元的钙信号,都具有一定同步性,并且这种同步性常随颞叶癫痫发作程度变高而增强。(3)CA1区和M1锥体神经元钙信号与不同颞叶癫痫发作之间的关系明晰。颞叶癫痫发作会伴随的复杂胞内Ca2+浓度变化,并且两个脑区的钙信号关系会随着行为变化而发生改变。实验结果表明,CA1区和M1之间的钙离子动态可以对不同等级的癫痫行为具有特异性,选择性地调节CA1区锥体神经元的异常钙离子信号可以有效缓解颞叶癫痫,从而阐明了颞叶癫痫诊断和治疗策略提供潜在新分子机制。

https://orcid.org/0000-0002-8195-8143 (Hui Shen); https://orcid.org/0000-0002-2210-0956 (Aili Liu)

Abstract: Temporal lobe epilepsy is a multifactorial neurological dysfunction syndrome that is refractory, resistant to antiepileptic drugs, and has a high recurrence rate. The pathogenesis of temporal lobe epilepsy is complex and is not fully understood. Intracellular calcium dynamics have been implicated in temporal lobe epilepsy. However, the effect of fluctuating calcium activity in CA1 pyramidal neurons on temporal lobe epilepsy is unknown, and no longitudinal studies have investigated calcium activity in pyramidal neurons in the hippocampal CA1 and primary motor cortex M1 of freely moving mice. In this study, we used a multi-channel fiber photometry system to continuously record calcium signals in CA1 and M1 during the temporal lobe epilepsy process. We found that calcium signals varied according to the grade of temporal lobe epilepsy episodes. In particular, cortical spreading depression, which has recently been frequently used to represent the continuously and substantially increased calcium signals, was found to correspond to complex and severe behavioral characteristics of temporal lobe epilepsy ranging from grade II to grade V. However, vigorous calcium oscillations and highly synchronized calcium signals in CA1 and M1 were strongly related to convulsive motor seizures. Chemogenetic inhibition of pyramidal neurons in CA1 significantly attenuated the amplitudes of the calcium signals corresponding to grade I episodes. In addition, the latency of cortical spreading depression was prolonged, and the above-mentioned abnormal calcium signals in CA1 and M1 were also significantly reduced. Intriguingly, it was possible to rescue the altered intracellular calcium dynamics. Via simultaneous analysis of calcium signals and epileptic behaviors, we found that the progression of temporal lobe epilepsy was alleviated when specific calcium signals were reduced, and that the end-point behaviors of temporal lobe epilepsy were improved. Our results indicate that the calcium dynamic between CA1 and M1 may reflect specific epileptic behaviors corresponding to different grades. Furthermore, the selective regulation of abnormal calcium signals in CA1 pyramidal neurons appears to effectively alleviate temporal lobe epilepsy, thereby providing a potential molecular mechanism for a new temporal lobe epilepsy diagnosis and treatment strategy.

Key words: Ca2+, calcium signals, chemogenetic methods, hippocampus, primary motor cortex, pyramidal neurons, temporal lobe epilepsy