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Wang JN, He S, Yang WX, Lu Y, Li K, Zhang YM, Wang YK. Type III NRG-1 plays a regulatory role in the regeneration process of nerves from the beginning of transplantation. J Orthop Surg Res 2023; 18:707. [PMID: 37730632 PMCID: PMC10512478 DOI: 10.1186/s13018-023-04191-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 09/12/2023] [Indexed: 09/22/2023] Open
Abstract
The present study investigated the effect of type III Neuregulin-1 (NRG-1) on changes in the myelin sheath and the recovery of nerve function during the regeneration process following autologous nerve transplantation. Seventy-two Sprague-Dawley rats were divided into a Blank, Model and (antisense oligonucleotide, ASON) group. The Model and ASON groups of SD rats were subjected to autologous nerve transplantation, and the Blank group only had the sciatic nerve exposed. The Model and ASON groups were given local injections of 2 ml PBS buffer solution and 2 ml ASON of Type III NRG-1, respectively, the NRG-1 type III was inhibited by ASON. Changes in the sciatic nerve functional index (SFI) and conduction velocities were observed at different 6 time points. Regeneration of the myelin sheath was observed using transmission electron microscopy. Type III NRG-1 protein was detected using Western blotting and immunohistochemistry, and NRG-1 mRNA was detected using PCR. The SFI of the ASON group was lower than the Model group after transplantation. The conduction velocities of the ASON group on the 14th and 21st days after autologous nerve transplantation were lower than the Model group (P < 0.01). The protein and mRNA expression of type III NRG-1 in the ASON group was lower than the Model group at all 6 time points. The area of medullated nerve fibres was significantly different between the ASON group and the Model group on the 3rd day (P < 0.05), as was the number of medullated nerve fibres per unit area (P < 0.01). The diameter of axons was obviously different between the two groups (P < 0.01). Type III NRG-1 played an important regulatory role in the regeneration process of the nerve from the beginning of transplantation to the 28th day.
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Affiliation(s)
- Jun-Ning Wang
- Department of Respiratory, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, 710054, People's Republic of China
| | - Sai He
- Department of Breast Cancer, Shaanxi Provincial Cancer Hospital, Xi'an, Shaanxi, China
| | - Wei-Xia Yang
- Department of Pathology, Genertec Universal Xihang Hospital (Xi'an) Co., Ltd., Xi'an, 710021, People's Republic of China
| | - Yao Lu
- Department of Orthopedics, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, 710054, People's Republic of China
| | - Kun Li
- Department of Orthopedics, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, 710054, People's Republic of China
| | - Yu-Min Zhang
- Department of Orthopedics, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, 710054, People's Republic of China
| | - Ya-Kang Wang
- Department of Orthopedics, Honghui Hospital, Xi'an Jiao Tong University, Xi'an, 710054, People's Republic of China.
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Liu J, Liu B, Yuan P, Cheng L, Sun H, Gui J, Pan Y, Huang D, Chen H, Jiang L. Role of PKA/CREB/BDNF signaling in PM2.5-induced neurodevelopmental damage to the hippocampal neurons of rats. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 214:112005. [PMID: 33640725 DOI: 10.1016/j.ecoenv.2021.112005] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 01/23/2021] [Accepted: 01/27/2021] [Indexed: 05/20/2023]
Abstract
Exposure to fine particulate matter (PM2.5) is implicated in neurodevelopmental disorders including cognitive decline, attention-deficit/hyperactivity disorder, and autism spectrum disorder. However, the specific molecular mechanisms by which PM2.5 impacts neurodevelopment are poorly understood. Accordingly, in the present study, the role of protein kinase A (PKA)/cAMP response element binding protein (CREB)/brain-derived neurotrophic factor (BDNF) signaling in PM2.5-induced neurodevelopmental damage was investigated using primary cultured hippocampal neurons. When hippocampal neurons cultured for 3 days in vitro (DIV3) were exposed to PM2.5 for 24 h and 96 h, neuronal viability decreased by 18.8% and 32.7% respectively, percentage of TUNEL-positive neurons increased by 78.5% and 64.0% separately, caspase-9 expression increased, lower postsynaptic density and shorter active zones were observed by transmission electron microscopy, expression of synapse-related proteins including postsynaptic density-95 (PSD95), growth associated protein-43 (GAP43), and synaptophysin (SYP) were decreased, and the phosphorylation levels of PKA, CREB, and BDNF expression also decreased. However, the PM2.5-induced neuronal damage could be ameliorated or aggravated to varying degrees by up- or down-regulation of the PKA/CREB/BDNF signaling pathway, respectively. Our results indicate that PM2.5 exposure exerts neurodevelopmental toxicity as indicated by lower viability, apoptosis, and synaptic damage in primary cultured hippocampal neurons, and that the PKA/CREB/BDNF pathways could play a vital role in PM2.5-mediated neurodevelopmental toxicity.
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Affiliation(s)
- Jie Liu
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Benke Liu
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Ping Yuan
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Li Cheng
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Hong Sun
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Jianxiong Gui
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Yanan Pan
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Dishu Huang
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Hengsheng Chen
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China
| | - Li Jiang
- Department of Neurology Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, 136# Zhongshan 2nd Road, Chongqing 400014, China.
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Qiao Y, Cong M, Li J, Li H, Li Z. The effects of neuregulin-1β on intrafusal muscle fiber formation in neuromuscular coculture of dorsal root ganglion explants and skeletal muscle cells. Skelet Muscle 2018; 8:29. [PMID: 30219099 PMCID: PMC6139134 DOI: 10.1186/s13395-018-0175-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 09/03/2018] [Indexed: 01/24/2023] Open
Abstract
Background The formation of intrafusal muscle (IM) fibers and their contact with afferent proprioceptive axons is critical for construction, function, and maintenance of the stretch reflex. Many factors affect the formation of IM fibers. Finding new factors and mechanisms of IM fiber formation is essential for the reconstruction of stretch reflex arc after injury. Methods We established a coculture system of organotypic dorsal root ganglion (DRG) explants and dissociated skeletal muscle (SKM) cells. The formation of IM fibers was observed in this coculture system after neuregulin-1β (NRG-1β) incubation. Results We found that NRG-1β promoted outgrowth of neurites and migration of neurons from the organotypic DRG explants and that this correlated with an induction of growth-associated protein 43 (GAP-43) expression. NRG-1β also increased the amount of nuclear bag fibers and nuclear chain fibers by elevating the proportion of tyrosine kinase receptor C (TrkC) phenotypic DRG neurons. In addition, we found that the effects of NRG-1β could be blocked by inhibiting ERK1/2, PI3K/Akt, and JAK2/STAT3 signaling pathways. Conclusion These data imply that NRG-1β promoted neurite outgrowth and neuronal migration from the organotypic DRG explants and that this correlated with an induction of GAP-43 expression. The modulating effects of NRG-1β on TrkC DRG neuronal phenotype may link to promote IM fiber formation. The effects produced by NRG-1β in this neuromuscular coculture system provide new data for the therapeutic potential on IM fiber formation after muscle injury. Electronic supplementary material The online version of this article (10.1186/s13395-018-0175-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yuan Qiao
- Department of Anatomy, Shandong University School of Basic Medical Sciences, 44 Wenhua Xi Road, Jinan, 250012, Shandong Province, China.,Department of Orthopaedics, Shandong University Qilu Hospital, Jinan, 250012, China
| | - Menglin Cong
- Department of Orthopaedics, Shandong University Qilu Hospital, Jinan, 250012, China
| | - Jianmin Li
- Department of Orthopaedics, Shandong University Qilu Hospital, Jinan, 250012, China
| | - Hao Li
- Department of Orthopaedics, Shandong University Qilu Hospital, Jinan, 250012, China
| | - Zhenzhong Li
- Department of Anatomy, Shandong University School of Basic Medical Sciences, 44 Wenhua Xi Road, Jinan, 250012, Shandong Province, China.
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