title: Rapid internalization of exogenous ganglioside GM3 and its metabolism to ceramide in human myelogenous leukemia HL-60 cells compared with control ganglioside GM1.
abstract: Incorporation and metabolism of exogenous GM3 in human myelogenous leukemia HL-60 cells were analyzed using 3H-labeled GM3 ([3H]GM3). [3H]GM3 was rapidly internalized into the cells (trypsin-resistant fraction) 8 times more than the control, 3H-labeled GM1 ([3H]GM1). In addition, not only incorporation but also metabolism of [3H]GM3 was more rapid than [3H]GM1 in HL-60 cells. Moreover, one of the metabolites was found to co-migrate with ceramide in thin-layer chromatography analysis and ceramide formation from exogenous GM3 is more rapid than that from exogenous GM1. These results suggested that there would be some preferential mechanism to produce ceramide from differentiation-inducible GM3 in HL-60 cells rather than from non-inducing GM1.
authors.affiliation: Division of Hemopoiesis, Institute of Hematology, Jichi Medical School, Minamikawachi, Tochigi, Japan. owlmnaka@jichi.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: A
authors.initials: A
authors.lastname: Tsunoda
authors.forename: Y
authors.initials: Y
authors.lastname: Furukawa
authors.forename: T
authors.initials: T
authors.lastname: Sakai
authors.forename: M
authors.initials: M
authors.lastname: Saito
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D002518:Ceramides / Q000378:metabolism*; D005677:G(M1) Ganglioside / Q000378:metabolism*; D005679:G(M3) Ganglioside / Q000378:metabolism*; D018922:HL-60 Cells / Q000378:metabolism*; D006801:Humans; D013696:Temperature
chemical_list: D002518:Ceramides; D005679:G(M3) Ganglioside; D005677:G(M1) Ganglioside