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2015 ; 42
(5
): 903-15
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Integrin ?v?8-Mediated TGF-? Activation by Effector Regulatory T Cells Is
Essential for Suppression of T-Cell-Mediated Inflammation
#MMPMID25979421
Worthington JJ
; Kelly A
; Smedley C
; Bauché D
; Campbell S
; Marie JC
; Travis MA
Immunity
2015[May]; 42
(5
): 903-15
PMID25979421
show ga
Regulatory T (Treg) cells play a pivotal role in suppressing self-harmful T cell
responses, but how Treg cells mediate suppression to maintain immune homeostasis
and limit responses during inflammation is unclear. Here we show that effector
Treg cells express high amounts of the integrin ?v?8, which enables them to
activate latent transforming growth factor-? (TGF-?). Treg-cell-specific deletion
of integrin ?v?8 did not result in a spontaneous inflammatory phenotype,
suggesting that this pathway is not important in Treg-cell-mediated maintenance
of immune homeostasis. However, Treg cells lacking expression of integrin ?v?8
were unable to suppress pathogenic T cell responses during active inflammation.
Thus, our results identify a mechanism by which Treg cells suppress exuberant
immune responses, highlighting a key role for effector Treg-cell-mediated
activation of latent TGF-? in suppression of self-harmful T cell responses during
active inflammation.