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2017 ; 2017
(ä): 6848430
Nephropedia Template TP
gab.com Text
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English Wikipedia
Growth Arrest-Specific 6 Enhances the Suppressive Function of CD4(+)CD25(+)
Regulatory T Cells Mainly through Axl Receptor
#MMPMID28270700
Zhao GJ
; Zheng JY
; Bian JL
; Chen LW
; Dong N
; Yu Y
; Hong GL
; Chandoo A
; Yao YM
; Lu ZQ
Mediators Inflamm
2017[]; 2017
(ä): 6848430
PMID28270700
show ga
Background. Growth arrest-specific (Gas) 6 is one of the endogenous ligands of
TAM receptors (Tyro3, Axl, and Mertk), and its role as an immune modulator has
been recently emphasized. Naturally occurring CD4(+)CD25(+) regulatory T cells
(Tregs) are essential for the active suppression of autoimmunity. The present
study was designed to investigate whether Tregs express TAM receptors and the
potential role of Gas6-TAM signal in regulating the suppressive function of
Tregs. Methods. The protein and mRNA levels of TAM receptors were determined by
using Western blot, immunofluorescence, flow cytometry, and RT-PCR. Then, TAM
receptors were silenced using targeted siRNA or blocked with specific antibody.
The suppressive function of Tregs was assessed by using a CFSE-based T cell
proliferation assay. Flow cytometry was used to determine the expression of Foxp3
and CTLA4 whereas cytokines secretion levels were measured by ELISA assay.
Results. Tregs express both Axl and Mertk receptors. Gas6 increases the
suppressive function of Tregs in vitro and in mice. Both Foxp3 and CTLA-4
expression on Tregs are enhanced after Gas6 stimulation. Gas6 enhances the
suppressive activity of Tregs mainly through Axl receptor. Conclusion. Gas6 has a
direct effect on the functions of CD4(+)CD25(+)Tregs mainly through its
interaction with Axl receptor.