Galactosylceramide (GalCer)

Galactosylceramide is a sphingolipid composed of ceramide with a galactose residue and represents the principal glycosphingolipid in brain tissue. As a critical structural component of myelin—the protective sheath around nerve cells—galactosylceramide is essential for normal nerve impulse transmission. While galactosylceramide is not itself a therapeutic target, it becomes clinically significant in Krabbe disease, an autosomal recessive lysosomal storage disorder caused by mutations in the GALC gene that encodes galactosylceramidase. When galactosylceramidase activity is deficient, galactosylceramide accumulates along with the toxic lipid psychosine, leading to demyelination and severe neurological deterioration. The therapeutic focus in Krabbe disease is therefore on the enzyme galactosylceramidase rather than galactosylceramide itself, with potential approaches including enzyme replacement therapy and gene therapy to restore enzymatic degradation capacity.

Other names

GalactocerebrosideCerebrosideGalactolipid

Not applicable. Galactosylceramide is not a drug target. However, galactosylceramidase (the GALC enzyme) is the therapeutic target in Krabbe disease, which breaks down galactosylceramide through hydrolysis.