ALTERED GANGLIOSIDE EXPRESSION BY SH-SY5Y CELLS UPON RETINOIC ACID-INDUCED NEURONAL DIFFERENTIATION

SH-SY5Y NEUROBLASTOMA cells were used to study the effect of retinoic acid (RA)-induced differentiation on the expression of gangliosides an d neuronal markers. In the presence of 10 mu M RA, more than 70% of th e cells differentiate to a neuronal phenotype within 8 days. They exte nd long neuritic processes and show an enhanced immuno-expression of n eurone-specific enolase (NSE), neurofilament protein (NF-M), and polys ialic acid (PSA). SH-SY5Y cells were found to express at least 12 diff erent gangliosides. RA-induced neuronal differentiation led to a decre ase in the content of GM2, GD3, and GD2 and to a 3-7 fold increased co ncentration of the ganglio-tetraosyl gangliosides GM1, GD1a, GT1a, GD1 b, and GT1b. Thus, RA-induced neuronal differentiation of SH-SY5Y cell s is accompanied by ganglioside changes similar to those observed duri ng embryonic neuronal differentiation.