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. 1981 Sep;78(9):5797–5801. doi: 10.1073/pnas.78.9.5797

Mannose 6-, fructose 1-, and fructose 6-phosphates inhibit human natural cell-mediated cytotoxicity.

J T Forbes, R K Bretthauer, T N Oeltmann
PMCID: PMC348866  PMID: 6946516

Abstract

In vitro human natural cell-mediated cytotoxicity (NCMC) to K-562, Molt-4, and F-265 cells is inhibited in a dose-dependent manner by mannose 6-phosphate, fructose 1-phosphate and fructose 6-phosphate. This inhibition is not observed with mannose, glucose, fucose, glucose 6-phosphate, mannose 1-phosphate, galactose 1-phosphate, or galactose 6-phosphate. Preincubation of the effector cells, obtained from fresh whole blood, with mannose-6-phosphate, fructose-1-phosphate, or fructose-6-phosphate did not inhibit cytotoxicity, which indicated that these hexose phosphates are not nonspecifically toxic towards the effector lymphocytes. Mannose-6-phosphate and the stereochemically similar fructose-1-phosphate are more potent inhibitors than fructose-6-phosphate in terms of concentration required and time of onset of effect. Inhibition of cytotoxicity by mannose-6-phosphate varied with target cell type: F-265 is protected at much lower concentrations of mannose-6-phosphate (less than 1 mM) than is either Molt-4 or K-562. The inhibition of NCMC is also observed with the inhibitors of lysosomal function, NH4Cl, and chloroquine. The presence of a functional mannose-6-phosphate receptor on target cells was demonstrated: (i) Gelonin, a seed protein that inactivates the eukaryotic ribosome but is nontoxic to intact cells, was covalently linked to monophosphopentamannose, and this conjugate ws toxic to both K-562 and F-265 target cells, the latter being by far the more sensitive; and (ii) chloroquine, NH4Cl, and mannose-6-phosphate all inhibited the toxicity of gelonin-monophosphopentamannose. These results suggest either that a cytolytic lymphokine contains a hexose phosphate residue and may be taken up by target cells through the lysosomal/mannose 6-phosphate pathway or that such a residue is involved in target cell-effector cell recognition.

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Selected References

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