Microglial cell activation pathway

The microglial cell activation pathway refers to a complex biological process in which microglia—the resident immune cells of the central nervous system—transition from a resting state to various activated states in response to stimuli such as pathogens, neuronal injury, or toxic compounds. Activation involves changes in morphology and behavior driven by exposure to cytokines and other signaling molecules. Activated microglia can adopt different functional phenotypes along an M1–M2 spectrum: M1 being pro-inflammatory and neurotoxic under certain conditions; M2 being anti-inflammatory and involved in tissue repair. This dynamic polarization is regulated by numerous signaling pathways and modulators including cytokines (e.g., IFN‑γ, IL‑6), chemokines, miRNAs (e.g., miR‑124), receptors such as TREM2 and CX3CR1, among others. Dysregulation of this process contributes significantly to neurodegenerative diseases like Alzheimer’s disease—as well as other CNS pathologies—by promoting chronic inflammation or failing to clear pathological aggregates. The “microglia cell activation pathway” is not itself a discrete molecular target but rather encompasses multiple potential therapeutic targets within its network.[1][2][3][4][5]

Other names

Microglia activation pathwayMicroglial activationMicroglia cell activationMicroglial phenotypic transition