Sonic Hedgehog signaling in oligodendrogenesis, myelination, demyelinating diseases, and remyelination

Abstract

This article explores the role of Sonic Hedgehog (SHH) signaling in the development and function of oligodendrocytes, the myelinating cells of the central nervous system. SHH influences the specification, proliferation, and migration of oligodendrocyte precursor cells (OPCs), and is crucial during embryonic and postnatal stages. The SHH/SMO pathway maintains OPCs in an undifferentiated state but is not essential for their final maturation or myelin formation. Experimental models suggest that modulating this pathway could enhance remyelination in diseases like multiple sclerosis and leukodystrophies. However, precise regulation is necessary to avoid adverse effects, such as tumorigenesis. The article highlights both canonical and non-canonical SHH signaling mechanisms and emphasizes the therapeutic potential of SHH/SMO “switches” to control OPC proliferation and differentiation. Further research is needed to understand the molecular environment and interactions with other pathways during demyelination and remyelination.