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Liu CH, Kuo YC, Wang CY, Hsu CC, Ho YJ, Chiang YC, Mai FD, Lin WJ, Liao WC. Syndecan-3 contributes to the regulation of the microenvironment at the node of Ranvier following end-to‑side neurorrhaphy: sodium image analysis. Histochem Cell Biol 2020; 155:355-367. [PMID: 33170350 DOI: 10.1007/s00418-020-01936-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2020] [Indexed: 12/15/2022]
Abstract
Syndecan-3 (SDC3) and Syndecan-4 (SDC4) are distributed throughout the nervous system (NS) and are favourable factors in motor neuron development. They are also essential for regulation of neurite outgrowth in the CNS. However, their roles in the reconstruction of the nodes of Ranvier after peripheral nerve injury (PNI) are still unclear. Present study used an in vivo model of end-to-side neurorrhaphy (ESN) for 1-3 months. The recovery of neuromuscular function was evaluated by grooming test. Expression and co-localization of SDC3, SDC4, and Nav1.6 channel (Nav1.6) at regenerating axons were detected by proximity ligation assay and confocal microscopy after ESN. Time-of-flight secondary ion mass spectrometry was used for imaging ions distribution on tissue. Our data showed that the re-clustering of sodium and Nav1.6 at nodal regions of the regenerating nerve corresponded to the distribution of SDC3 after ESN. Furthermore, the re-establishment of sodium and Nav1.6 correlated with the recovery of muscle power 3 months after ESN. This study suggested syndecans may involve in stabilizing Nav1.6 and further modulate the distribution of sodium at nodal regions after remyelination. The efficiency of sodium re-clustering was improved by the assistance of anionic syndecan, resulting in a better functional repair of PNI.
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Affiliation(s)
- Chiung-Hui Liu
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
- Department of Medical Education, Chung Shan Medical University Hospital, No. 110, Sec.1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Yu-Chen Kuo
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Che-Yu Wang
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Chao-Chun Hsu
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Ying-Jui Ho
- Department of Psychology, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Yun-Chi Chiang
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Fu-Der Mai
- Department of Biochemistry and Molecular Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, No. 250, Wuxing St, Taipei, 11031, Taiwan
| | - Wei-Jhih Lin
- Department of Forensic Science, Central Police University, 56 Shu-Jen Road, Kwei-San, Taoyuan, 33304, Taiwan
| | - Wen-Chieh Liao
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan.
- Department of Medical Education, Chung Shan Medical University Hospital, No. 110, Sec.1, Jianguo N. Rd, Taichung, 40201, Taiwan.
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Gao J, Su G, Liu J, Zhang J, Zhou J, Liu X, Tian Y, Zhang Z. Mechanisms of Inhibition of Excessive Microglial Activation by Melatonin. J Mol Neurosci 2020; 70:1229-1236. [PMID: 32222896 DOI: 10.1007/s12031-020-01531-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Accepted: 03/12/2020] [Indexed: 12/22/2022]
Abstract
As the innate immune cells that permanently reside in the central nervous system (CNS), microglia play an increasingly important role in maintaining brain function. Normally, microglia act as resting phenotype, which can be activated by various types of stimuli and release a variety of inflammatory mediators. Melatonin is an endogenous rhythmic hormone secreted principally by the pineal gland. Increasing evidence suggests that melatonin can detoxify reactive oxygen species (ROS) and prevent microglia from over-activation. This review summarizes the mechanisms of melatonin in inhibiting excessive activation of microglia and demonstrates the feasibility of melatonin in the treatment of diseases related to microglial over-activation.
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Affiliation(s)
- Juan Gao
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Gang Su
- Institute of Genetics, School of Basic Medical Sciences, Lanzhou University, Lanzhou, 730000, Gansu, China
| | - Jifei Liu
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Jiajia Zhang
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Juanping Zhou
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Xiaoyan Liu
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Ye Tian
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China
| | - Zhenchang Zhang
- Department of Neurology, Lanzhou University Second Hospital, Lanzhou, 730030, Gansu, China.
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Liu CH, Chang HM, Wu TH, Chen LY, Yang YS, Tseng TJ, Liao WC. Rearrangement of potassium ions and Kv1.1/Kv1.2 potassium channels in regenerating axons following end-to-end neurorrhaphy: ionic images from TOF-SIMS. Histochem Cell Biol 2017; 148:407-416. [PMID: 28405806 DOI: 10.1007/s00418-017-1570-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/03/2017] [Indexed: 11/28/2022]
Abstract
The voltage-gated potassium channels Kv1.1 and Kv1.2 that cluster at juxtaparanodal (JXP) regions are essential in the regulation of nerve excitability and play a critical role in axonal conduction. When demyelination occurs, Kv1.1/Kv1.2 activity increases, suppressing the membrane potential nearly to the equilibrium potential of K+, which results in an axonal conduction blockade. The recovery of K+-dependent communication signals and proper clustering of Kv1.1/Kv1.2 channels at JXP regions may directly reflect nerve regeneration following peripheral nerve injury. However, little is known about potassium channel expression and its relationship with the dynamic potassium ion distribution at the node of Ranvier during the regenerative process of peripheral nerve injury (PNI). In the present study, end-to-end neurorrhaphy (EEN) was performed using an in vivo model of PNI. The distribution of K+ at regenerating axons following EEN was detected by time-of-flight secondary-ion mass spectrometry. The specific localization and expression of Kv1.1/Kv1.2 channels were examined by confocal microscopy and western blotting. Our data showed that the re-establishment of K+ distribution and intensity was correlated with the functional recovery of compound muscle action potential morphology in EEN rats. Furthermore, the re-clustering of Kv1.1/1.2 channels 1 and 3 months after EEN at the nodal region of the regenerating nerve corresponded to changes in the K+ distribution. This study provided direct evidence of K+ distribution in regenerating axons for the first time. We proposed that the Kv1.1/Kv1.2 channels re-clustered at the JXP regions of regenerating axons are essential for modulating the proper patterns of K+ distribution in axons for maintaining membrane potential stability after EEN.
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Affiliation(s)
- Chiung-Hui Liu
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan.,Department of Medical Education, Chung Shan Medical University Hospital, No. 110, Sec. 1, Jianguo N. Rd, Taichung, Taiwan
| | - Hung-Ming Chang
- Department of Anatomy and Cell Biology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan
| | - Tsung-Huan Wu
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Li-You Chen
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Yin-Shuo Yang
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - To-Jung Tseng
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan
| | - Wen-Chieh Liao
- Department of Anatomy, Faculty of Medicine, Chung Shan Medical University, No. 110, Sec. 1, Jianguo N. Rd, Taichung, 40201, Taiwan. .,Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan.
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