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2015 ; 5
(3
): 392-404
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gab.com Text
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English Wikipedia
Interleukin-25 Mediates Transcriptional Control of PD-L1 via STAT3 in Multipotent
Human Mesenchymal Stromal Cells (hMSCs) to Suppress Th17 Responses
#MMPMID26321145
Wang WB
; Yen ML
; Liu KJ
; Hsu PJ
; Lin MH
; Chen PM
; Sudhir PR
; Chen CH
; Chen CH
; Sytwu HK
; Yen BL
Stem Cell Reports
2015[Sep]; 5
(3
): 392-404
PMID26321145
show ga
Multipotent human mesenchymal stromal cells (hMSCs) harbor immunomodulatory
properties that are therapeutically relevant. One of the most clinically
important populations of leukocytes is the interleukin-17A (IL-17A)-secreting T
(Th17) lymphocytes. However, mechanisms of hMSC and Th17 cell interactions are
incompletely resolved. We found that, along with Th1 responses, hMSCs strongly
suppressed Th17 responses and this required both IL-25--also known as IL--17E-as
well as programmed death ligand-1 (PD-L1), a potent cell surface ligand for
tolerance induction. Knockdown of IL-25 expression in hMSCs abrogated Th17
suppression in vitro and in vivo. However, IL-25 alone was insufficient to
significantly suppress Th17 responses, which also required surface PD-L1
expression. Critically, IL-25 upregulated PD-L1 surface expression through the
signaling pathways of JNK and STAT3, with STAT3 found to constitutively occupy
the proximal region of the PD-L1 promoter. Our findings demonstrate the
complexities of hMSC-mediated Th17 suppression, and highlight the
IL-25/STAT3/PD-L1 axis as a candidate therapeutic target.