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2016 ; 291
(38
): 19985-93
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Chaperonin-containing T-complex Protein 1 Subunit ? Serves as an Autoantigen
Recognized by Human V?2 ?? T Cells in Autoimmune Diseases
#MMPMID27489109
Chen H
; You H
; Wang L
; Zhang X
; Zhang J
; He W
J Biol Chem
2016[Sep]; 291
(38
): 19985-93
PMID27489109
show ga
Human ?? T cells recognize conserved endogenous and stress-induced antigens
typically associated with autoimmune diseases. However, the role of ?? T cells in
autoimmune diseases is not clear. Few autoimmune disease-related antigens
recognized by T cell receptor (TCR) ?? have been defined. In this study, we
compared V?2 TCR complementarity-determining region 3 (CDR3) between systemic
lupus erythematosus (SLE) patients and healthy donors. Results show that CDR3
length distribution differed significantly and displayed oligoclonal
characteristics in SLE patients when compared with healthy donors. We found no
difference in the frequency of J? gene fragment usage between these two groups.
According to the dominant CDR3? sequences in SLE patients, synthesized SL2
peptides specifically bound to human renal proximal tubular epithelial cell line
HK-2; SL2-Vm, a mutant V sequence of SL2, did not bind. We identified the
putative protein ligand chaperonin-containing T-complex protein 1 subunit ?
(CCT6A) using SL2 as a probe in HK-2 cell protein extracts by affinity
chromatography and liquid chromatography-electrospray ionization-tandem mass
spectrometry analysis. We found CCT6A expression on the surface of HK-2 cells.
Cytotoxicity of only V?2 ?? T cells to HK-2 cells was blocked by anti-CCT6A
antibody. Finally, we note that CCT6A concentration was significantly increased
in plasma of SLE and rheumatoid arthritis patients. These data suggest that CCT6A
is a novel autoantigen recognized by V?2 ?? T cells, which deepens our
understanding of mechanisms in autoimmune diseases.