ANTIBODY CROSS-REACTIVITIES BETWEEN GANGLIOSIDES AND LIPOPOLYSACCHARIDES OF CAMPYLOBACTER-JEJUNI SEROTYPES ASSOCIATED WITH GUILLAIN-BARRE-SYNDROME

Ganglioside-antibodies produced subsequent to Campylobacter jejuni inf ection may play a role in the pathogenesis of the neurological disorde r Guillain-Barre syndrome (GBS). Since lipopolysaccharides (LPS) of ce rtain C.jejuni serotypes associated with GBS (O:2, O:4, O:19) exhibit structural mimicry of gangliosides in their core oligosaccharides, we investigated antibody and ligand cross-reactivities between gangliosid es and LPS of these C.jejuni serotypes, GM1-antibody reacted with O:19 LPS reflecting GM1 mimicry by the O:19 core oligosaccharide, On the o ther hand, asialoGM1-antibody bound to O:2 and O:19 LPS indicating a s hared epitope not dependent on ganglioside mimicry, Serum IgA from GBS patients after C.jejuni infection reacted with gangliosides, predomin antly GM1, and LPS of all three serotypes, Cholera toxin (GM1 ligand) recognized O:4 and O:19 LPS, whereas peanut agglutinin (Gal beta 1-3Ga lNAc ligand) recognized LPS of all three serotypes, thereby confirming structural mimicry, These results suggest that LPS from certain C.jej uni strains may function as cross-reactive antigens for anti-gangliosi de B cells.