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1 |
7529806
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Immunoregulatory CD8+ cells recognize antigen-activated CD4+ cells in myasthenia gravis patients and in healthy controls.
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7529806
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CD8+ cells inhibiting the response of CD4+ cells exist in rodents, recognizing epitopes unique to a CD4+ clone (Ids) or expressed by all activated CD4+ cell (ergotypes).
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7529806
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Stimulation of CD8+ cells recognizing ergotypes shared by all Ag-activated CD4+ cells would be useful for treatment of diseases involving undesirable CD4+ responses to ill defined Ags, such as many autoimmune diseases and allergies.
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7529806
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As a first step toward demonstrating the existence of anti-ergotype CD8+ immunoregulatory cells in humans, we investigated here whether CD8+ cells recognizing Ag-activated CD4+ cells exist in autoimmune and healthy humans.
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7529806
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CD4+ cells specific for human muscle acetylcholine receptor, tetanus, or diphtheria toxoids were propagated from patients with myasthenia gravis patients and healthy controls.
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6 |
7529806
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Ag-activated CD4+ cells were irradiated and used as Ag to test the response of CD(4+)-depleted CD(8+)-enriched PBMC (CD8+ PBMC) from myasthenic patients and controls and to propagate short-term CD8+ cell lines from CD8+ PBMC.
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7 |
7529806
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In both patients and controls CD8+ PBMC and CD8+ lines responded vigorously to autologous Ag-activated CD4+ cells.
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8 |
7529806
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The CD8+ lines responded equally well to the Ag-activated CD4+ cells of different Ag specificity, suggesting that they recognized CD4+ ergotypes.
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9 |
7529806
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The CD8+ cells recognized class I-restricted epitopes, as their response to activated CD4+ cells was suppressed by anti-class I Ab.
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10 |
7529806
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CD8+ cells recognizing Ag-activated CD4+ were present cells in the controls for 5 to 12 wk after immunization.
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11 |
7529806
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In myasthenic patients, CD8+ cells recognizing activated anti-acetylcholine receptor CD4+ cells seemed to be always present.
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