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• W2012036027 abstract "It has been shown that HLA class I molecules play a significant role in the regulation of the proliferation of T cells activated by mitogens and antigens. We evaluated the ability of mAb to a framework determinant of HLA class I molecules to regulate T cell proliferation and interferon gamma (IFN-<FONT FACE=Symbol>g</FONT>) production against leishmania, PPD, C. albicans and tetanus toxoid antigens in patients with tegumentary leishmaniasis and healthy subjects. The anti-major histocompatibility complex (MHC) mAb (W6/32) suppressed lymphocyte proliferation by 90% in cultures stimulated with <FONT FACE=Symbol>a</FONT>CD3, but the suppression was variable in cultures stimulated with leishmania antigen. This suppression ranged from 30-67% and was observed only in 5 of 11 patients. IFN-<FONT FACE=Symbol>g</FONT> production against leishmania antigen was also suppressed by anti-HLA class I mAb. In 3 patients IFN-<FONT FACE=Symbol>g</FONT> levels were suppressed by more than 60%, while in the other 2 cultures IFN-<FONT FACE=Symbol>g</FONT> levels were 36 and 10% lower than controls. The suppression by HLA class I mAb to the proliferative response in leishmaniasis patients and in healthy controls varied with the antigens and the patients or donors tested. To determine whether the suppression is directed at antigen presenting cells (APCs) or at the responding T cells, experiments with antigen-primed non-adherent cells, separately incubated with W6/32, were performed. Suppression of proliferation was only observed when the W6/32 mAb was added in the presence of T cells. These data provide evidence that a mAb directed at HLA class I framework determinants can suppress proliferation and cytokine secretion in response to several antigens." @default.
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• W2012036027 date "1998-12-01" @default.
• W2012036027 modified "2023-09-25" @default.
• W2012036027 title "Regulation of T cell response to leishmania antigens by determinants of histocompatibility leukocyte class I and II molecules" @default.
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• W2012036027 doi "https://doi.org/10.1590/s0100-879x1998001200010" @default.
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