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2018 ; 16
(7
): e2005380
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The actin remodeling protein cofilin is crucial for thymic ?? but not ?? T-cell
development
#MMPMID29985916
Seeland I
; Xiong Y
; Orlik C
; Deibel D
; Prokosch S
; Küblbeck G
; Jahraus B
; De Stefano D
; Moos S
; Kurschus FC
; Arnold B
; Samstag Y
PLoS Biol
2018[Jul]; 16
(7
): e2005380
PMID29985916
show ga
Cofilin is an essential actin remodeling protein promoting depolymerization and
severing of actin filaments. To address the relevance of cofilin for the
development and function of T cells in vivo, we generated knock-in mice in which
T-cell-specific nonfunctional (nf) cofilin was expressed instead of wild-type
(WT) cofilin. Nf cofilin mice lacked peripheral ?? T cells and showed a severe
thymus atrophy. This was caused by an early developmental arrest of thymocytes at
the double negative (DN) stage. Importantly, even though DN thymocytes expressed
the TCR? chain intracellularly, they completely lacked TCR? surface expression.
In contrast, nf cofilin mice possessed normal numbers of ?? T cells. Their
functionality was confirmed in the ?? T-cell-driven, imiquimod (IMQ)-induced,
psoriasis-like murine model. Overall, this study not only highlights the
importance of cofilin for early ?? T-cell development but also shows for the
first time that an actin-binding protein is differentially involved in ?? versus
?? T-cell development.