Microglial inflammatory signaling pathways

Microglial inflammatory signaling pathways represent the integrated network of molecular cascades that govern the activation of microglia, the resident macrophages of the central nervous system (CNS). These pathways, which include the Toll-like receptor 4 (TLR4)/NF-κB axis, the NLRP3 inflammasome, and the TREM2 signaling pathway, are activated in response to various stimuli such as protein aggregates (e.g., amyloid-beta), cellular debris, or pathogens (Nature Reviews Immunology, 2017). While acute activation is a protective mechanism intended to maintain CNS homeostasis, chronic or excessive signaling leads to the sustained release of neurotoxic pro-inflammatory cytokines and reactive oxygen species, which are central to the pathogenesis of neurodegenerative conditions like Alzheimer's and Parkinson's disease (Science, 2019). Therapeutic intervention in these pathways focuses on shifting the microglial phenotype from a detrimental pro-inflammatory state to a beneficial neuroprotective or homeostatic state (Journal of Neuroinflammation, 2020). Current pharmacological approaches include the use of small molecule inhibitors and monoclonal antibodies to target specific nodes within these cascades to mitigate neuroinflammation and preserve neuronal integrity.

Other names

Microglial activation pathwaysNeuroinflammatory signaling cascadesMicroglial pro-inflammatory signaling

Modulation of microglial activation states through the inhibition of pro-inflammatory cytokine production, suppression of NF-κB translocation, or blockade of inflammasome assembly (Journal of Neuroinflammation, 2020).