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Metabolism of ether glycolipids with potentially antineoplastic activity by Ehrlich ascites tumor cells
1Bundesanstalt für Fettforschung, Institut für Biochemie und Technologie, H.P. Kaufmann-Institut, Münster, F.R.G.
Abstract:
Ehrlich ascites tumor cells were incubated in vitro with rac-1-O-[1'-14C]octadecyl-2-O-methylglycero-3-beta-D-glucopyranosi de for 24 h. The potentially antineoplastic ether glycolipid was rapidly metabolized by the cells to radioactive 1-O-octadecyl-2-O-methylglycerol (70 pmol/10(6) cells per h) and further acylated to 1-O-octadecyl-2-O-methyl-3-acylglycerols. Incubation of Ehrlich ascites cells with synthetic rac-1-O-[1'-14C]octadecyl-2-O-methyl-3-palmitoylglycerol showed that this metabolite is reconverted by deacylation to 14C-labeled 1-O-octadecyl-2-O-methylglycerol. The latter compound or a metabolite derived therefrom may be the 'toxic principle' of both the ether glyceroglycolipids and ether glycerophospholipids having a 1-O-alkyl-2-O-methylglyceryl moiety, as suggested by Unger et al. (J. Natl. Cancer Inst. 78 (1987) 219-222).