Chondroitin sulphate proteoglycan production by NK cells and T cells: effects of xylosides on proliferation and cytotoxic function.
Christmas, Stephen E Steward, William P Lyon, Malcolm Gallagher, John T Moore, M
Christmas, Stephen E
Steward, William P
Lyon, Malcolm
Gallagher, John T
Moore, M
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Abstract
Cultured human NK cells and T cells grown in the presence of IL-2 and phytohaemagglutinin incorporated 35S sulphate into two distinct macromolecular species. The larger molecule was identified as a chondroitin-4-sulphate proteoglycan and was present in both cell-associated and secreted material. The smaller component was identified as free glycosaminoglycan and was present only in the cell-associated material. The sulphated macromolecules synthesized by NK cells were smaller than those produced by T cells. Growth in the presence of beta-D-xyloside led to a decrease in proteoglycan production, together with an increase in the synthesis of free glycosaminoglycan. The latter molecule was found in the secreted as well as the cell-associated fraction. In all instances, growth of T cells was inhibited by xyloside in a dose-dependent fashion. However, growth of NK cells from 3/7 donors was stimulated at low concentrations of xyloside (0.25 and 0.5 mM). Growth of NK cells in xyloside had no effect on their lytic activity, and the 'NK-like' cytolytic capacity of cultured T cells was similarly unaffected. Both NK cells and T cells grown in xyloside at a concentration resulting in a 50% inhibition of intact proteoglycan synthesis did not show increased susceptibility to autolysis in the presence of NK-cell targets. These findings suggest that optimal production of the intact proteoglycan molecule may not be essential for NK-cell lytic function or protection of effector cells in vitro.
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Date
1988-02
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Citation
Chondroitin sulphate proteoglycan production by NK cells and T cells: effects of xylosides on proliferation and cytotoxic function. 1988, 63 (2):225-31 Immunology