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- W2078861104 abstract "Autoreactive alpha beta T cells have been implicated as playing a primary pathogenic role in a group of diseases characterized by chronic muscle inflammation known as the idiopathic inflammatory myopathies (IIM). gamma delta T cells, a distinct and enigmatic class of T cells, play a less certain role in a variety of human autoimmune diseases including the IIM. In an attempt to understand the significance of gamma delta T cells in the IIM, we utilized a sensitive polymerase chain reaction (PCR) technique to evaluate gamma delta T cell receptor (TCR) gene expression in 45 muscle biopsies obtained from 42 IIM patients (17 polymyositis, 12 dermatomyositis, and 13 inclusion body myositis). gamma delta TCR gene expression was not detected in 36 specimens, the majority of muscle biopsies surveyed. gamma delta TCR gene expression by muscle-infiltrating lymphocytes was detected among nine clinically heterogeneous patients. We further analysed the junctional sequence composition of the V gamma 3 and V delta 1 transcripts, whose expression was prominent among gamma delta positive patients. DNA sequence analysis of V gamma 3 amplification products from two patients revealed the presence of several productively rearranged transcripts with amino acid sequence similarities within the V gamma 3-N-J gamma junctional domain. No amino acid sequence similarities were evident within the V delta-N-D delta-N-J delta region of V delta 1 transcripts amplified from four patients, although a distinct and dominant clonotype was detected from each patient. Our cumulative data suggest that unlike alpha beta T cells, gamma delta T cells do not play a prominent pathologic role in the IIM. In fact, the sporadic nature of gamma delta TCR gene expression detected among these patients implies that gamma delta T cell infiltration, when it occurs, is a secondary event perhaps resulting from non-specific inflammatory processes." @default.
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- W2078861104 date "1995-06-01" @default.
- W2078861104 modified "2023-10-12" @default.
- W2078861104 title "γδ T cell receptor gene expression by muscle-infiltrating lymphocytes in the idiopathic inflammatory myopathies" @default.
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- W2078861104 doi "https://doi.org/10.1111/j.1365-2249.1995.tb03732.x" @default.
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