Glial scar tissue

The glial scar is a complex reactive cellular and molecular structure that forms in the central nervous system (CNS) following injury, such as spinal cord trauma, stroke, or traumatic brain injury [3, 10]. It is primarily composed of reactive astrocytes, microglia, and NG2-positive cells, embedded within a dense extracellular matrix rich in chondroitin sulfate proteoglycans (CSPGs) and other inhibitory glycoproteins [2, 11]. In the acute phase, the glial scar serves a protective role by sealing the injury site, preventing the spread of inflammation, and restoring the blood-brain barrier [9, 12]. However, in the chronic phase, its dense physical and biochemical composition becomes a significant barrier to axonal regeneration and functional recovery [1, 7]. Therapeutic strategies aim to modulate this environment by either suppressing the initial formation of the scar using anti-inflammatory drugs and cytokine inhibitors or by degrading the established inhibitory matrix using enzymes like Chondroitinase ABC [5, 7]. Recent research also explores regenerative gene therapies, such as the use of NeuroD1, to convert scar-forming astrocytes directly into functional neurons [6].

Other names

Glial scarAstrocytic scarReactive gliosisReactive astrogliosis

Modulation of reactive astrogliosis, enzymatic degradation of inhibitory extracellular matrix components, inhibition of inflammatory cytokine signaling, and cellular reprogramming of glia into functional neurons [3, 5, 6].