Axonal regeneration

Axonal regeneration is the biological process by which injured nerve fibers (axons) regrow to restore neural connectivity and function following damage. It involves complex molecular programs encompassing intrinsic neuronal growth pathways (e.g., upregulation of regeneration-associated genes, activation of transcription factors, reorganization of the cytoskeleton) and extrinsic factors such as the injury microenvironment, presence of inhibitory molecules, and clearance of myelin debris. Efficient axonal regeneration is robust in the peripheral nervous system (PNS), aided by macrophages and Schwann cells, but is limited in the central nervous system (CNS) due to inhibitory signaling, glial scarring, and a non-permissive milieu. Therapeutic approaches target these barriers by modulating molecular pathways, enhancing intrinsic growth potential, or changing the local environment to promote nerve repair and regain function.

Other names

Axon regenerationAxonal sproutingNerve regenerationNeurite outgrowth

Mechanisms of drugs/biologics that promote axonal regeneration include: Inhibition of axon growth inhibitors (e.g., Nogo receptor antagonism); Modulation of signaling pathways (e.g., JAK/STAT3, RhoA, cAMP, integrin signaling); Epigenetic modulation (enhancing histone acetylation to promote regeneration-associated gene expression); Stabilization of microtubules and cytoskeleton (e.g., paclitaxel).