STAT3 signaling integrates neuroinflammation, mitochondrial stress, and glial remodeling in spinal cord injury

Spinal cord injury (SCI) is a devastating neurological disorder characterized by profound disturbances in cytokine signaling, redox balance, mitochondrial homeostasis, and glial-neuronal communication. Current therapeutic strategies to attenuate secondary injury are limited, leaving a significant gap for effective molecularly targeted interventions. Emerging evidence identifies signal transducer and activator of transcription 3 (STAT3) as a critical signaling node in the neurochemical response to SCI, influencing multiple pathological cascades that contribute to poor recovery.

This review synthesized current literature on STAT3's multifaceted role in spinal cord injury (SCI). The authors analyzed studies detailing STAT3's pronounced spatiotemporal and cell-type-specific activation post-injury. They examined its influence on neuroinflammation, astrocyte and microglial reactivity, mitochondrial bioenergetics, oxidative stress, ferroptosis, apoptosis, and the regenerative state of the injured spinal cord. The review frames STAT3 as an integrative regulator, discussing emerging therapeutic strategies and outlining key challenges for precise translational targeting.

STAT3 acts as a central integrative regulator in SCI neurochemistry, linking cytokine-driven signaling to metabolic stress, glial remodeling, and axonal repair. Its activation is highly context-dependent, varying significantly by injury phase, specific cell type, and subcellular localization.

STAT3 exhibits dual roles, capable of both amplifying and restraining neuroinflammation, critically shaping astrocyte and microglial reactivity, and influencing mitochondrial bioenergetics and oxidative stress. Furthermore, STAT3 modulates cell death pathways such as ferroptosis and apoptosis, and directly impacts the regenerative capacity of the injured spinal cord. The review emphasizes that STAT3 is not merely a downstream effector of the JAK/STAT cascade but a complex hub that orchestrates diverse pathological and reparative processes.