Ganglioside alterations in stimulated murine macrophages

A two-dimensional thin-layer chromatographic technique has been used to separate and display gangliosides from murine peritoneal macrophages in different functional states. Resident macrophages have a relatively simple ganglioside pattern with about 15 resorcinol-positive spots. Gangliosides from resident cells contained mostly (90%) N-glycolylneuraminic acid. Thioglycolate-elicited and Corynebacterium parvum-activated macrophages have much more complex patterns with about 40 resorcinol-positive spots. Although ganglioside sialic acid content of stimulated macrophages was only slightly higher than that of resident cells, it consisted of nearly equal amounts of N-acetyl- and N-glycolylneuraminic acid. The shift in the ganglioside sialic acid type and the expression of different gangliosides in macrophages upon stimulation may help explain some of the differences in function and responsiveness noted in these macrophage populations.