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2017 ; 1
(6
): 109-123
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The RNA-Binding Protein HuR Posttranscriptionally Regulates IL-2 Homeostasis and
CD4(+) Th2 Differentiation
#MMPMID30035254
Techasintana P
; Ellis JS
; Glascock J
; Gubin MM
; Ridenhour SE
; Magee JD
; Hart ML
; Yao P
; Zhou H
; Whitney MS
; Franklin CL
; Martindale JL
; Gorospe M
; Davis WJ
; Fox PL
; Li X
; Atasoy U
Immunohorizons
2017[Aug]; 1
(6
): 109-123
PMID30035254
show ga
Posttranscriptional gene regulation by RNA-binding proteins, such as HuR
(elavl1), fine-tune gene expression in T cells, leading to powerful effects on
immune responses. HuR can stabilize target mRNAs and/or promote translation by
interacting with their 3' untranslated region adenylate and uridylate-rich
elements. It was previously demonstrated that HuR facilitates Th2 cytokine
expression by mRNA stabilization. However, its effects upon IL-2 homeostasis and
CD4(+) Th2 differentiation are not as well understood. We found that optimal
translation of Il2ra (CD25) required interaction of its mRNA with HuR.
Conditional HuR knockout in CD4(+) T cells resulted in loss of IL-2 homeostasis
and defects in JAK-STAT signaling, Th2 differentiation, and cytokine production.
HuR-knockout CD4(+) T cells from OVA-immunized mice also failed to proliferate in
response to Ag. These results demonstrate that HuR plays a pivotal role in
maintaining normal IL-2 homeostasis and initiating CD4(+) Th2 differentiation.