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2018 ; 8
(1
): 5629
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NRF2 regulates the glutamine transporter Slc38a3 (SNAT3) in kidney in response to
metabolic acidosis
#MMPMID29618784
Lister A
; Bourgeois S
; Imenez Silva PH
; Rubio-Aliaga I
; Marbet P
; Walsh J
; Shelton LM
; Keller B
; Verrey F
; Devuyst O
; Giesbertz P
; Daniel H
; Goldring CE
; Copple IM
; Wagner CA
; Odermatt A
Sci Rep
2018[Apr]; 8
(1
): 5629
PMID29618784
show ga
Expression of the glutamine transporter SNAT3 increases in kidney during
metabolic acidosis, suggesting a role during ammoniagenesis. Microarray analysis
of Nrf2 knock-out (KO) mouse kidney identified Snat3 as the most significantly
down-regulated transcript compared to wild-type (WT). We hypothesized that in the
absence of NRF2 the kidney would be unable to induce SNAT3 under conditions of
metabolic acidosis and therefore reduce the availability of glutamine for
ammoniagenesis. Metabolic acidosis was induced for 7 days in WT and Nrf2 KO mice.
Nrf2 KO mice failed to induce Snat3 mRNA and protein expression during metabolic
acidosis. However, there were no differences in blood pH, bicarbonate, pCO(2),
chloride and calcium or urinary pH, ammonium and phosphate levels. Normal
induction of ammoniagenic enzymes was observed whereas several amino acid
transporters showed differential regulation. Moreover, Nrf2 KO mice during
acidosis showed increased expression of renal markers of oxidative stress and
injury and NRF2 activity was increased during metabolic acidosis in WT kidney. We
conclude that NRF2 is required to adapt the levels of SNAT3 in response to
metabolic acidosis. In the absence of NRF2 and SNAT3, the kidney does not have
any major acid handling defect; however, increased oxidative stress and renal
injury may occur.
|Acidosis/*physiopathology
[MESH]
|Amino Acid Transport Systems, Neutral/genetics/*metabolism
[MESH]