Hanganutziu-Deicher (HD) antigen-active N-glycolylneuraminic acid (NeuGc)-containing gangliosides were isolated and characterized from human colon cancer tissues. The antigenic gangliosides were detected by thin-layer chromatography by our newly developed method (H. Higashi, Y. Fukui, S. Ueda, S. Kato, Y. Hirabayashi, M. Matsumoto, and M. Naiki, J. Biochem., 95: 1517–1520, 1984) of enzyme immunostaining using affinitypurified chicken antibody against hematoside containing NeuGc (II3NeuGc-LacCer) and horseradish peroxidase-conjugated rabbit anti-chicken IgG. One to six species of the antigenic gangliosides were isolated from seven of 16 cases of colon cancer, whereas no antigenic compound was detected in all apparently normal colorectal tissues from 17 individuals without colorectal cancer. Tissues from different patients showed different patterns of molecular species of the antigenic gangliosides. Densitometric determination indicated that HD antigenic sialic acid, NeuGc, accounted for about 1% or less of the total lipid-bound sialic acids. Four species of antigenic gangliosides were identified as hematoside and hematoside-containing O-acyl ester (II3NeuGc-LacCer and II34- or 7-O-acyl-NeuGc-LacCer), GM2-containing NeuGc (II3NeuGc-GgOse3Cer), and sialylparagloboside (IV3NeuGc-nLcOse4Cer) by their behaviors on 2-dimensional thinlayer chromatography, and the effects of mild alkaline treatment, sialidase treatment, periodate oxidation, and endo-β-galactosidase treatment.

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This work was partly supported by a Grant-in-Aid for Scientific Research (58760218) from the Ministry of Education, Science, and Culture of Japan.

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