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2017 ; 7
(ä): 46580
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Salt suppresses IFN? inducible chemokines through the IFN?-JAK1-STAT1 signaling
pathway in proximal tubular cells
#MMPMID28425456
Arai Y
; Takahashi D
; Asano K
; Tanaka M
; Oda M
; Ko SBH
; Ko MSH
; Mandai S
; Nomura N
; Rai T
; Uchida S
; Sohara E
Sci Rep
2017[Apr]; 7
(ä): 46580
PMID28425456
show ga
The mechanisms of immunoactivation by salt are now becoming clearer. However,
those of immunosuppression remain unknown. Since clinical evidence indicates that
salt protects proximal tubules from injury, we investigated mechanisms
responsible for salt causing immunosuppression in proximal tubules. We focused on
cytokine-related gene expression profiles in kidneys of mice fed a high salt diet
using microarray analysis and found that both an interferon gamma (IFN?)
inducible chemokine, chemokine (C-X-C motif) ligand 9 (CXCL9), and receptor,
CXCR3, were suppressed. We further revealed that a high salt concentration
suppressed IFN? inducible chemokines in HK2 proximal tubular cells. Finally, we
demonstrated that a high salt concentration decreased IFNGR1 expression in the
basolateral membrane of HK2 cells, leading to decreased phosphorylation of
activation sites of Janus kinase 1 (JAK1) and Signal Transducers and Activator of
Transcription 1 (STAT1), activators of chemokines. JAK inhibitor canceled the
effect of a high salt concentration on STAT1 and chemokines, indicating that the
JAK1-STAT1 signaling pathway is essential for this mechanism. In conclusion, a
high salt concentration suppresses IFN?-JAK1-STAT1 signaling pathways and
chemokine expressions in proximal tubules. This finding may explain how salt
ameliorates proximal tubular injury and offer a new insight into the linkage
between salt and immunity.