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2015 ; 112
(10
): 3044-9
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Tetramers reveal IL-17-secreting CD4+ T cells that are specific for U1-70 in
lupus and mixed connective tissue disease
#MMPMID25713364
Kattah NH
; Newell EW
; Jarrell JA
; Chu AD
; Xie J
; Kattah MG
; Goldberger O
; Ye J
; Chakravarty EF
; Davis MM
; Utz PJ
Proc Natl Acad Sci U S A
2015[Mar]; 112
(10
): 3044-9
PMID25713364
show ga
Antigen-specific CD4(+) T cells are implicated in the autoimmune disease systemic
lupus erythematosus (SLE), but little is known about the peptide antigens that
they recognize and their precise function in disease. We generated a series of
MHC class II tetramers of I-E(k)-containing peptides from the spliceosomal
protein U1-70 that specifically stain distinct CD4(+) T-cell populations in
MRL/lpr mice. The T-cell populations recognize an epitope differing only by the
presence or absence of a single phosphate residue at position serine(140). The
frequency of CD4(+) T cells specific for U1-70(131-150):I-E(k) (without
phosphorylation) correlates with disease severity and anti-U1-70 autoantibody
production. These T cells also express ROR?t and produce IL-17A. Furthermore, the
U1-70-specific CD4(+) T cells that produce IL-17A are detected in a subset of
patients with SLE and are significantly increased in patients with mixed
connective tissue disease. These studies provide tools for studying
antigen-specific CD4(+) T cells in lupus, and demonstrate an antigen-specific
source of IL-17A in autoimmune disease.