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The Impact of Nuclear Factor Kappa B on the Response of Microglia in Spinal Cord Injuries
Iordanis Varsamos1, Christos Patilas1, Athanasios Galanis1
13rd Department of Orthopedics, National and Kapodistrian University of Athens, KAT General Hospital, Athens, GRC.
Abstract:
Spinal cord injury (SCI) results in both primary and secondary damage, each contributing to the overall injury and its consequences. Following SCI, microglia, the resident immune cells of the central nervous system (CNS), undergo a series of complex responses that contribute to the pathophysiology of the injury. In the context of SCI, nuclear factor kappa B (NF-kB) emerged as a critical mediator in the regulation of inflammatory responses following SCI. The aim of this review is to provide a comprehensive understanding of the involvement of NF-kB in the response of microglia following SCI. The PUBMED database was searched using the following keywords: NF-kB AND microglia AND spinal cord injury. Clinical and experimental studies evaluating the role of NF-kB in the response of microglia following SCI were included. Systematic reviews, case reports, research protocols, conference articles, and studies in languages other than English were excluded. The final analysis included 52 studies. NF-kB signaling exerts profound effects on the microglial response following SCI, influencing the inflammatory milieu, tissue damage, and potential for repair and recovery. Deactivation of the NF-kB signaling pathway suppresses the production of proinflammatory mediators in microglia, after SCI. Moreover, NF-kB suppression has neuroprotective effects, as it mitigates neuronal apoptosis and facilitates the M2 microglial phenotype, alleviating tissue damage after SCI. Moreover, several microRNAs play a crucial role in regulating gene expression post-transcriptionally and have emerged as key regulators in microglia activation after SCI. Overall, the role of NF-kB in the response of microglia to SCI is complex and context-dependent. While NF-kB activation is involved in initiating and propagating the inflammatory response following SCI, it also plays a role in tissue repair and regeneration. Thus, modulating NF-kB signaling in microglia represents a potential therapeutic target for attenuating inflammation and promoting neuroprotection and tissue repair in SCI.
Insights
Nuclear factor kappa B (NF-kB) plays a complex role in microglia responses after spinal cord injury (SCI). Modulating NF-kB offers potential for reducing inflammation and promoting healing in SCI.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Spinal cord injury (SCI) causes primary and secondary damage, involving complex microglial responses.
- Microglia, the CNS immune cells, are critical in SCI pathophysiology.
- Nuclear factor kappa B (NF-kB) is a key mediator of inflammatory responses post-SCI.
Purpose of the Study:
- To comprehensively review the involvement of NF-kB in microglial responses following SCI.
- To understand the dual role of NF-kB in inflammation, damage, and repair after SCI.
- To explore NF-kB as a potential therapeutic target for SCI.
Main Methods:
- A systematic literature search of the PUBMED database was conducted.
- Keywords used were: NF-kB, microglia, and spinal cord injury.
- Inclusion criteria focused on clinical and experimental studies; systematic reviews and other study types were excluded.
Main Results:
- NF-kB signaling significantly impacts microglial responses, influencing inflammation, tissue damage, and repair.
- Deactivating NF-kB suppresses pro-inflammatory mediators and offers neuroprotection by reducing apoptosis.
- NF-kB suppression promotes the M2 microglial phenotype, aiding tissue repair after SCI.
Conclusions:
- NF-kB's role in microglia activation post-SCI is complex and context-dependent.
- While initiating inflammation, NF-kB also contributes to tissue repair and regeneration.
- Targeting NF-kB signaling in microglia presents a promising therapeutic strategy for SCI.
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