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2017 ; 8
(ä): 14644
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Potassium channels Kv1 3 and KCa3 1 cooperatively and compensatorily regulate
antigen-specific memory T cell functions
#MMPMID28248292
Chiang EY
; Li T
; Jeet S
; Peng I
; Zhang J
; Lee WP
; DeVoss J
; Caplazi P
; Chen J
; Warming S
; Hackos DH
; Mukund S
; Koth CM
; Grogan JL
Nat Commun
2017[Mar]; 8
(ä): 14644
PMID28248292
show ga
Voltage-gated Kv1.3 and Ca(2+)-dependent KCa3.1 are the most prevalent K(+)
channels expressed by human and rat T cells. Despite the preferential
upregulation of Kv1.3 over KCa3.1 on autoantigen-experienced effector memory T
cells, whether Kv1.3 is required for their induction and function is unclear.
Here we show, using Kv1.3-deficient rats, that Kv1.3 is involved in the
development of chronically activated antigen-specific T cells. Several immune
responses are normal in Kv1.3 knockout (KO) rats, suggesting that KCa3.1 can
compensate for the absence of Kv1.3 under these specific settings. However,
experiments with Kv1.3 KO rats and Kv1.3 siRNA knockdown or channel-specific
inhibition of human T cells show that maximal T-cell responses against
autoantigen or repeated tetanus toxoid stimulations require both Kv1.3 and
KCa3.1. Finally, our data also suggest that T-cell dependency on Kv1.3 or KCa3.1
might be irreversibly modulated by antigen exposure.