Blood-Group A and the Related Glycolipids of Human Lung12

Abstract
Three glucosamine-containing sphingoglycolipids were isolated from human lung tissue of a blood group-A subject. They were hexaglycosyl, pentaglycosyl, and tetraglycosyl ceramides. The hexaglycosyl ceramide exhibited blood group-A anti-genicity, and the following chemical structure was proposed on the basis of sequential glycosidase treatment and methylation analysis. The pentaglycosyl ceramide from human lung was a blood group H(O)-active glycolipid having a carbohydrate composition of Fuc:GlcNAc:Gal:Glc (1:1:2:1). The tetraglycosyl ceramide is probably paragloboside (lactoneotetraosyl ceramide).

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