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- W53353908 abstract "The loss of the biological activity of interleukin-2 (IL-2, T-cell growth factor) in the presence of alpha 2-macroglobulin-trypsin (alpha 2M.t) complexes has been investigated using an IL-2-dependent cloned 'cytotoxic' murine T-cell line. While reaction mixtures of native alpha 2M, aprotinin or methylamine-treated alpha 2M and IL-2 had no effect on IL-2 activity when incubated at 37 degrees for 5 h, alpha 2M.t (90 nM, [T]:[alpha 2M] = 0.8) inactivated IL-2 at a rate of one-sixth of that of the free enzyme. This effect was abolished by treatment of alpha 2M.t with aprotinin (MW 6500). Soybean trypsin inhibitor coupled to Sepharose 4B was capable of absorbing the IL-2 degrading activity from the trypsin solution. In contrast, alpha 2M.t treated with the solid-phase immobilized soybean trypsin inhibitor continued to inactivate IL-2, but did not degrade a macromolecular substrate (remazol-brilliant blue hide). Thus, IL-2 (MW 15,500) gains access to the active site of the alpha 2M-bound trypsin, resulting in a rapid loss of its biological activity. These observations offer an explanation for the in vitro immunosuppressive effects of alpha 2M.t." @default.
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- W53353908 date "1986-03-01" @default.
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- W53353908 title "Inactivation of human interleukin-2 (IL-2) by alpha 2-macroglobulin-trypsin complexes." @default.
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