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2017 ; 127
(4
): 1321-1337
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Membrane-organizing protein moesin controls Treg differentiation and antitumor
immunity via TGF-? signaling
#MMPMID28287407
Ansa-Addo EA
; Zhang Y
; Yang Y
; Hussey GS
; Howley BV
; Salem M
; Riesenberg B
; Sun S
; Rockey DC
; Karvar S
; Howe PH
; Liu B
; Li Z
J Clin Invest
2017[Apr]; 127
(4
): 1321-1337
PMID28287407
show ga
Moesin is a member of the ezrin-radixin-moesin (ERM) family of proteins that are
important for organizing membrane domains and receptor signaling and regulating
the migration of effector T cells. Whether moesin plays any role during the
generation of TGF-?-induced Tregs (iTregs) is unknown. Here, we have discovered
that moesin is translationally regulated by TGF-? and is also required for
optimal TGF-? signaling that promotes efficient development of iTregs. Loss of
moesin impaired the development and function of both peripherally derived iTregs
and in vitro-induced Tregs. Mechanistically, we identified an interaction between
moesin and TGF-? receptor II (T?RII) that allows moesin to control the surface
abundance and stability of T?RI and T?RII. We also found that moesin is required
for iTreg conversion in the tumor microenvironment, and the deletion of moesin
from recipient mice supported the rapid expansion of adoptively transferred CD8+
T cells against melanoma. Our study establishes moesin as an important regulator
of the surface abundance and stability of T?RII and identifies moesin's role in
facilitating the efficient generation of iTregs. It also provides an advancement
to our understanding about the role of the ERM proteins in regulating signal
transduction pathways and suggests that modulation of moesin is a potential
therapeutic target for Treg-related immune disorders.