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2017 ; 6
(ä): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Na(+) influx via Orai1 inhibits intracellular ATP-induced mTORC2 signaling to
disrupt CD4 T cell gene expression and differentiation
#MMPMID28492364
Miao Y
; Bhushan J
; Dani A
; Vig M
Elife
2017[May]; 6
(ä): ä PMID28492364
show ga
T cell effector functions require sustained calcium influx. However, the
signaling and phenotypic consequences of non-specific sodium permeation via
calcium channels remain unknown. ?-SNAP is a crucial component of Orai1 channels,
and its depletion disrupts the functional assembly of Orai1 multimers. Here we
show that ?-SNAP hypomorph, hydrocephalus with hopping gait, Napa(hyh/hyh) mice
harbor significant defects in CD4 T cell gene expression and Foxp3 regulatory T
cell (Treg) differentiation. Mechanistically, TCR stimulation induced rapid
sodium influx in Napa(hyh/hyh) CD4 T cells, which reduced intracellular ATP,
[ATP](i). Depletion of [ATP](i) inhibited mTORC2 dependent NF?B activation in
Napa(hyh/hyh) cells but ablation of Orai1 restored it. Remarkably, TCR
stimulation in the presence of monensin phenocopied the defects in Napa(hyh/hyh)
signaling and Treg differentiation, but not IL-2 expression. Thus, non-specific
sodium influx via bonafide calcium channels disrupts unexpected signaling nodes
and may provide mechanistic insights into some divergent phenotypes associated
with Orai1 function.
|*Gene Expression
[MESH]
|*Signal Transduction
[MESH]
|Adenosine Triphosphate/*metabolism
[MESH]
|Animals
[MESH]
|CD4 Antigens/*biosynthesis
[MESH]
|CD4-Positive T-Lymphocytes/physiology
[MESH]
|Cations/metabolism
[MESH]
|Cell Differentiation
[MESH]
|Mechanistic Target of Rapamycin Complex 2/*metabolism
[MESH]