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2018 ; 10
(10
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Sodium Citrate Increases Expression and Flux of Mg(2+) Transport Carriers
Mediated by Activation of MEK/ERK/c-Fos Pathway in Renal Tubular Epithelial
Cells
#MMPMID30241394
Takashina Y
; Manabe A
; Hasegawa H
; Matsunaga T
; Endo S
; Ikari A
Nutrients
2018[Sep]; 10
(10
): ä PMID30241394
show ga
A chronic magnesium deficiency may be one of the causes of lifestyle-related
diseases such as hypertension and diabetes. Serum Mg(2+) concentration is
strictly controlled by the reabsorption pathway in the renal tubules, but little
is known about how Mg(2+) reabsorption is upregulated. We searched for food
compounds which can increase the expression levels of Mg(2+) transport carriers
including transient receptor potential melastatin 6 (TRPM6) channel and cyclin M2
(CNNM2). Sodium citrate (SC) increased the mRNA levels of TRPM6 and CNNM2 in
renal tubular epithelial NRK-52E cells. The SC-induced elevation of TRPM6 was
inhibited by U0126, a mitogen-activated protein kinase kinase (MEK) inhibitor,
but the CNNM2 was not. SC increased the levels of p-ERK1/2 and p-c-Fos, which
were inhibited by U0126. SC induced alkalization of culture medium. Both SC and
alkalization enhanced Mg(2+) influx, which was inhibited by U0126 and
introduction of TRPM6 siRNA. The reporter activity of TRPM6 was increased by SC
and alkalization, which was suppressed by mutation in an AP-1-binding site. The
SC-induced elevation of p-ERK1/2 and p-EGFR was inhibited by diphenylene
iodonium, a nicotinamide adenine dinucleotide phosphate (NADPH) oxidase
inhibitor, and erlotinib, an epidermal growth factor receptor (EGFR) tyrosine
kinase inhibitor. SC did not change the level of acetyl histone H3, but increased
the association of c-Fos with the promoter region of TRPM6. These results suggest
that SC increases TRPM6 expression and Mg(2+) influx mediated by the activation
of NADPH oxidase and an EGFR/ERK/c-Fos pathway in the renal tubules.
|Animals
[MESH]
|Binding Sites
[MESH]
|Cation Transport Proteins/genetics/*metabolism
[MESH]