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2016 ; 196
(12
): 4915-24
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Decreased SAP Expression in T Cells from Patients with Systemic Lupus
Erythematosus Contributes to Early Signaling Abnormalities and Reduced IL-2
Production
#MMPMID27183584
Karampetsou MP
; Comte D
; Kis-Toth K
; Terhorst C
; Kyttaris VC
; Tsokos GC
J Immunol
2016[Jun]; 196
(12
): 4915-24
PMID27183584
show ga
T cells from patients with systemic lupus erythematosus (SLE) display a number of
abnormalities, including increased early signaling events following engagement of
the TCR. Signaling lymphocytic activation molecule family cell surface receptors
and the X-chromosome-defined signaling lymphocytic activation molecule-associated
protein (SAP) adaptor are important in the development of several immunocyte
lineages and modulating the immune response. We present evidence that SAP protein
levels are decreased in T cells and in their main subsets isolated from 32 women
and three men with SLE, independent of disease activity. In SLE T cells, SAP
protein is also subject to increased degradation by caspase-3. Forced expression
of SAP in SLE T cells normalized IL-2 production, calcium (Ca(2+)) responses, and
tyrosine phosphorylation of a number of proteins. Exposure of normal T cells to
SLE serum IgG, known to contain anti-CD3/TCR Abs, resulted in SAP downregulation.
We conclude that SLE T cells display reduced levels of the adaptor protein SAP,
probably as a result of continuous T cell activation and degradation by
caspase-3. Restoration of SAP levels in SLE T cells corrects the overexcitable
lupus T cell phenotype.