Abstract
Mycoplasma arthritidis-derived superantigen (MAS) is exclusively produced by M. arthritidis, which is the only known mycoplasma to produce a superantigen. As a superantigen, MAS shows properties similar to those of the staphylococcal enterotoxins and related substances, such as binding to major histocompatibility complex (MHC) class II and V beta-specific stimulation of T cells. In this series of experiments, we demonstrate some differences between MAS and other superantigens. MAS induced the production of tumor necrosis factor alpha (TNF-alpha) mRNA in human as well as in murine leukocytes. However, only in murine leukocytes was the mRNA adequately translated into the protein. In human peripheral blood mononuclear cells, we found only small amounts of TNF, whereas in murine spleen cells we detected levels more than three times higher. The proliferative response to MAS has been shown to be restricted to I-E alpha in the murine MHC. Furthermore, TNF was induced in I-E alpha+ bone marrow-derived macrophages by MAS. In these cells, MAS rapidly induced very high levels of TNF and the amounts of mRNA detected correlated to the amount of protein produced. In comparison with other superantigens, including the staphylococcal enterotoxins, toxic shock syndrome toxin 1, and exfoliative toxin A, the failure of MAS to induce TNF-alpha in human peripheral blood mononuclear cells is specific for MAS and not common to all superantigens. The direct activation of bone marrow-derived macrophages also seems to be specific for MAS. These data suggest that the induction of TNF-alpha by MAS is dependent on the strength of binding to the MHC class II molecule.
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