Complement Inhibitor(s) Released by Leukocytes

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Abstract
Mouse spleen or thymus cells in short-term culture release a factor, designated S, that binds to sheep erythrocytes (E). Supernatant-treated sheep erythrocytes (SE) are capable of fixing and transferring the activated first component of guinea pig complement. SEC1̄, however is not capable of initiating hemolysis by the rest of the complement components. SE is capable of binding but not activating native C1; native C1 bound to SE seems irreversibly inhibited. Evidence is presented that S may be the same factor as the previously described inhibitor released by mouse spleen or thymus cells that inhibits the utilization of C2 by EAC1̄4.

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