Decreased fucose incorporation in cell surface carbohydrates is associated with inhibition of invasion

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Abstract
Invasion of malignant MO4 cells into embryonic chick heart fragments in an organ culture assay was arrested for at least 7 days when the temperature was lowered to 28°C. Prolonged culturing of MO4 cells at 28°C on tissue culture substrates showed no recuperation of fucose incorporation into cell surface glycopeptides. However, invasion was restored after 10 days of organ culture in confrontation with chick heart tissue at 28°C. A histoautoradiographic study showed that the regained capability to invade was accompanied by an increase in fucose labeling of the MO4 cells in the invading areas. At 28°C the incorporation of [3H]fucose into total cell protein was drastically reduced, whereas [3H]leucine incorporation as a measure for protein synthesis was less affected. Cell surface glycopeptides, metabolically labeled with either fucose or glucosamine at 28°C, showed a time-dependent decrease in the incorporation of fucose but not of glucosamine and no changes in overall size distribution. Low temperature did not reduce fucosyltransferase activity but the relative accumulation of fucose-1-P suggested inhibited conversion towards GDP-fucose. Moreover, mouse L cells which were incapable of invading chick heart tissue appeared also deficient in fucose incorporation, owing to low levels of fucosyltransferase activity. According to the results, fucosylation of surface carbohydrates may be required for invasive capacity and restored in MO4 cells invading at 28°C by metabolic cooperation with the host tissue.