The purpose of this study was to analyze the profile of glycosphingolipids
(GSLs) in periradicular lesions refractory to endodontic treatment. Sixteen
periapical lesions were removed surgically from patients (experimental gro
up) and compared with 10 samples of periodontal ligament removed from extra
cted intact third molars (control group). After the GSLs extraction and pur
ification procedures were performed the neutral and acidic GSL fractions we
re analyzed by high-performance thin-layer chromatography and quantified by
densitometry, Data reported herein show that: (i) tissues in the experimen
tal group presented about twice as much GSLs as the control group; (ii) les
ion tissues express lactoneotetraosylceramide, and lactofucopentaosyl (IV)
ceramide, whereas these neutral GSLs are absent in normal tissues; and (iii
) normal tissues express GT1b, whereas lesions cells do not express this gl
anglioside. In contrast lesion tissues express GM3, which is conspicuously
absent in normal tissues.