IFN-alpha Downregulates ERK Phosphorylation of CD4+ T Lymphocytes in Systemic Lupus Erythematosus / 대한류마티스학회지
The Journal of the Korean Rheumatism Association
;
: 193-202, 2006.
Article
Dans Coréen
| WPRIM
| ID: wpr-34700
ABSTRACT
OBJECTIVE:
CD4+ T cells from patients with systemic lupus erythematosus (SLE) display aberrant TCR signaling and IFN-alpha plays critical roles in the pathogenesis of SLE; however, the effects of IFN-alpha on disease-associated TCR signaling defects remain unknown. This study investigated the ERK phosphorylation during TCR triggering and the effects of IFN-alpha on ERK signaling in CD4+ T cells.METHODS:
CD4+ T lymphocytes were sorted from PBMC using magnetic beads in patients with SLE who met the 1982 revised ACR criteria for SLE and age-matched healthy controls. The phosphorylation of ERK 1/2 was analyzed by flow cytometry and mean fluorescent intensity was measured to define the degree of phosphorylation of ERK. In some experiments, anti-CD3 stimulation was performed after preincubation with patient or control serum, diluted in tissue culture media, with or without addition of an anti-IFN-alpha antibody. The serum level of IFN-alpha was measured by ELISA.RESULTS:
ERK-1/2 phosphorylation was decreased in CD4+ T cells of lupus patients than healthy controls and associated with disease activity. Pre-incubation of control CD4+ T cells with allogeneic lupus plasma decreased ERK-1/2 phosphorylation more than allogeneic control and RA plasma and this was reversed by anti-IFN-alpha Ab. Accordingly, ERK-1/2 phosphorylation was decreased in control CD4+ T cells pre-incubation with lupus plasma with high IFN-alpha levels more than lupus plasma with non-detectable IFN-alpha levels. Recombinant IFN-alpha inhibited TCR-mediated ERK-1/2 phosphorylation dose-dependently.CONCLUSION:
These results suggest that IFN-alpha stimulation in vivo may underlie the aberrant TCR-mediated MAPK signaling in lupus CD4+ T cells and associated with disease pathogenesis.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Phosphorylation
/
Plasma sanguin
/
Test ELISA
/
Lymphocytes T
/
Milieux de culture
/
Cytométrie en flux
/
Lupus érythémateux disséminé
Limites du sujet:
Humains
langue:
Coréen
Texte intégral:
The Journal of the Korean Rheumatism Association
Année:
2006
Type:
Article
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