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- W2017742707 abstract "Myasthenia gravis (MG) and experimental autoimmune MG (EAMG) are T-cell regulated, antibody-mediated diseases. Peptides p195-212 and p259-271 of the human acetylcholine receptor (AChR) alpha-subunit, were previously shown to be immunodominant T cell epitopes in MG patients as well as in SJL and BALB/c mice, respectively. A dual altered peptide ligand (APL) composed of the two single amino acid analogs of the myasthenogenic peptides was shown to inhibit, in vitro and in vivo, MG-associated autoimmune responses. Furthermore, the dual APL was shown to down-regulate the clinical manifestations of an established EAMG in C57BL/6 mice injected with Torpedo AChR (TAChR). In the present study we attempted the elucidation of the mechanism(s) by which the dual APL down-regulates EAMG-associated responses. It is shown here that the dual APL acts by actively suppressing, in a specific manner, myasthenogenic T cell responses. The active suppression is mediated, at least partially, by the up-regulation of the secretion of TGF-beta following administration of the dual APL. The up-regulated secretion of TGF-beta is accompanied by down-regulation of IFN-gamma and IL-2 [T helper (Th) 1-type cytokine] secretion and by an up-regulation of IL-10 secretion (Th2-type cytokine). Furthermore, the inhibitory effect of the dual APL could be adoptively transferred to p195-212 or TAChR-immunized mice. The down-regulation of IL-2 secretion and the ability of recombinant IL-2 to rescue lymph node cells of mice treated with the dual APL from a state of unresponsiveness suggests that the dual APL acts also, at least partially, by causing the cells to undergo anergy." @default.
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- W2017742707 date "2001-10-16" @default.
- W2017742707 modified "2023-09-25" @default.
- W2017742707 title "The nature of the active suppression of responses associated with experimental autoimmune myasthenia gravis by a dual altered peptide ligand administered by different routes" @default.
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- W2017742707 doi "https://doi.org/10.1073/pnas.221456798" @default.
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