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      Gold nanoclusters conjugated berberine reduce inflammation and alleviate neuronal apoptosis by mediating M2 polarization for spinal cord injury repair

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          Abstract

          Spinal cord injury (SCI) leads to nerve cell apoptosis and loss of motor function. Herein, excessive activation of the M1 phenotype macrophages/microglia is found to be the main reason for the poor prognosis of SCI, but the selective activation phenotype (M2) macrophages/microglia facilitates the recovery of SCI. Thereafter, we used gold nanoclusters loaded berberine (BRB-AuNCs) to reduce inflammation by inhibiting the activation of M1 phenotype macrophages/microglia, which simultaneously inhibited neuronal apoptosis after SCI. In vitro and in vivo experiments showed that BRB-AuNCs reduced M1 protein marker CD86, increased M2 protein marker CD206, reduced inflammation and apoptotic cytokines (IL-1β, IL-6, TNF-α, Cleaved Caspase-3 and Bax). These results indicate that BRB-AuNCs have excellent anti-inflammatory and anti-apoptotic effects by inducing the polarization of macrophages/microglia from M1 phenotype to M2 phenotype. Thereafter, the motor functions of SCI rats were significantly improved after treatment with BRB-AuNCs. This work not only provides a new way for the treatment of SCI but also broadens BRB utilization strategies.

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          Most cited references43

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          Traumatic Spinal Cord Injury: An Overview of Pathophysiology, Models and Acute Injury Mechanisms

          Traumatic spinal cord injury (SCI) is a life changing neurological condition with substantial socioeconomic implications for patients and their care-givers. Recent advances in medical management of SCI has significantly improved diagnosis, stabilization, survival rate and well-being of SCI patients. However, there has been small progress on treatment options for improving the neurological outcomes of SCI patients. This incremental success mainly reflects the complexity of SCI pathophysiology and the diverse biochemical and physiological changes that occur in the injured spinal cord. Therefore, in the past few decades, considerable efforts have been made by SCI researchers to elucidate the pathophysiology of SCI and unravel the underlying cellular and molecular mechanisms of tissue degeneration and repair in the injured spinal cord. To this end, a number of preclinical animal and injury models have been developed to more closely recapitulate the primary and secondary injury processes of SCI. In this review, we will provide a comprehensive overview of the recent advances in our understanding of the pathophysiology of SCI. We will also discuss the neurological outcomes of human SCI and the available experimental model systems that have been employed to identify SCI mechanisms and develop therapeutic strategies for this condition.
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            Repertoire of microglial and macrophage responses after spinal cord injury.

            Macrophages from the peripheral circulation and those derived from resident microglia are among the main effector cells of the inflammatory response that follows spinal cord trauma. There has been considerable debate in the field as to whether the inflammatory response is good or bad for tissue protection and repair. Recent studies on macrophage polarization in non-neural tissues have shed much light on their changing functional states. In the context of this literature, we discuss the activation of macrophages and microglia following spinal cord injury, and their effects on repair. Harnessing their anti-inflammatory properties could pave the way for new therapeutic strategies for spinal cord trauma.
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              Macrophage activation and its role in repair and pathology after spinal cord injury.

              The injured spinal cord does not heal properly. In contrast, tissue repair and functional recovery occur after skin or muscle injuries. The reason for this dichotomy in wound repair is unclear but inflammation, and specifically macrophage activation, likely plays a key role. Macrophages have the ability to promote the repair of injured tissue by regulating transitions through different phase of the healing response. In the current review we compare and contrast the healing and inflammatory responses between spinal cord injuries and tissues that undergo complete wound resolution. Through this comparison, we identify key macrophage phenotypes that are inaptly triggered or absent after spinal cord injury and discuss spinal cord stimuli that contribute to this maladaptive response. Sequential activation of classic, pro-inflammatory, M1 macrophages and alternatively activated, M2a, M2b, and M2c macrophages occurs during normal healing and facilitates transitions through the inflammatory, proliferative, and remodeling phases of repair. In contrast, in the injured spinal cord, pro-inflammatory macrophages potentiate a prolonged inflammatory phase and remodeling is not properly initiated. The desynchronized macrophage activation after spinal cord injury is reminiscent of the inflammation present in chronic, non-healing wounds. By refining the role macrophages play in spinal cord injury repair we bring to light important areas for future neuroinflammation and neurotrauma research. This article is part of a Special Issue entitled SI: Spinal cord injury.
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                Author and article information

                Journal
                Regen Biomater
                Regen Biomater
                rb
                Regenerative Biomaterials
                Oxford University Press
                2056-3418
                2056-3426
                2022
                02 December 2021
                02 December 2021
                : 9
                : rbab072
                Affiliations
                [1 ] Department of The First Clinical College, Liaoning University of Traditional Chinese Medicine , No. 79, Chongshan East Road, Huanggu District, Shenyang City, Liaoning Province 110847, P.R. China
                [2 ] Department of Orthopedics, First Affiliated Hospital of Jinzhou Medical University , Jinzhou, China
                [3 ] Department of Basic Science, Jinzhou Medical University , Jinzhou, China
                [4 ] Department of Otolaryngology-Head and Neck Surgery, First Affiliated Hospital of Jinzhou Medical University , Jinzhou, China
                [5 ] Jinzhou Medical University , No.40, Section 3, Songpo Road, Linghe District Jinzhou City, Liaoning Province 121001, P.R.China 
                Author notes
                Correspondence address. Tel: +86-13504064506; E-mail: meixifan@ 123456jzmu.edu.cn

                Zipeng Zhou and Dan Li contributed equally to this work.

                Author information
                https://orcid.org/0000-0003-3698-0525
                Article
                rbab072
                10.1093/rb/rbab072
                9089162
                35558096
                7c28f11b-1983-424c-931c-18f860ecffc9
                © The Author(s) 2021. Published by Oxford University Press.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 29 July 2021
                : 18 November 2021
                : 22 November 2021
                : 10 May 2022
                Page count
                Pages: 13
                Funding
                Funded by: National Natural Science Foundation of China (NSFC);
                Award ID: 81871556
                Award ID: 82072165
                Funded by: Liaoning Revitalization Talents Program, DOI 10.13039/501100018617;
                Award ID: NO. XLYC1902108
                Categories
                Research Article
                AcademicSubjects/MED00010
                AcademicSubjects/SCI01410

                gold nanoclusters,berberine,macrophages/microglia,spinal cord injury

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