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2014 ; 126
(3
): 223-32
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CRAC channel inhibition produces greater anti-inflammatory effects than
glucocorticoids in CD8 cells from COPD patients
#MMPMID23905758
Grundy S
; Kaur M
; Plumb J
; Reynolds S
; Hall S
; House D
; Begg M
; Ray D
; Singh D
Clin Sci (Lond)
2014[Feb]; 126
(3
): 223-32
PMID23905758
show ga
There are increased numbers of pulmonary CD8 lymphocytes in COPD (chronic
obstructive pulmonary disease). CRAC (calcium release-activation calcium)
channels play a central role in lymphocyte activation though the regulation of
the transcription factor NFAT (nuclear factor of activated T-cells). We studied
the expression of NFAT in lungs from COPD patients compared with controls, and
evaluated the effects of CRAC channel inhibition compared with corticosteroids on
NFAT activation and cytokine production in CD8 cells from COPD patients. The
effects of the corticosteroid dexamethasone, the calcineurin inhibitor
cyclosporin and the CRAC channel inhibitor Synta 66 were studied on cytokine
production and NFAT activation using peripheral blood and isolated pulmonary CD8
cells. NFAT1 and CD8 co-expression in the lungs was compared in COPD patients and
controls using combined immunohistochemistry and immunofluorescence. NFAT
inhibition with either cyclosporin or Synta 66 resulted in significantly greater
maximal inhibition of cytokines than dexamethasone in both peripheral blood and
pulmonary CD8 cells [e.g. >95% inhibition of IFN? (interferon ?) production from
pulmonary CD8 cells using cyclosporin and Synta 66 compared with <50% using
dexamethasone]. The absolute number of pulmonary CD8 cells co-expressing NFAT1
was significantly raised in lungs from COPD patients compared with controls, but
the percentage of CD8 cells co-expressing NFAT1 was similar between COPD patients
and controls (80.7% compared with 78.5% respectively, P=0.3). Inhibition of NFAT
using the CRAC channel Synta 66 produces greater anti-inflammatory effects on CD8
cells from COPD patients than corticosteroids. NFAT is expressed at a high level
in pulmonary CD8 cells in COPD.