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2016 ; 24
(4
): 770-8
Nephropedia Template TP
gab.com Text
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English Wikipedia
Inhibition of Glycolate Oxidase With Dicer-substrate siRNA Reduces Calcium
Oxalate Deposition in a Mouse Model of Primary Hyperoxaluria Type 1
#MMPMID26758691
Dutta C
; Avitahl-Curtis N
; Pursell N
; Larsson Cohen M
; Holmes B
; Diwanji R
; Zhou W
; Apponi L
; Koser M
; Ying B
; Chen D
; Shui X
; Saxena U
; Cyr WA
; Shah A
; Nazef N
; Wang W
; Abrams M
; Dudek H
; Salido E
; Brown BD
; Lai C
Mol Ther
2016[Apr]; 24
(4
): 770-8
PMID26758691
show ga
Primary hyperoxaluria type 1 (PH1) is an autosomal recessive, metabolic disorder
caused by mutations of alanine-glyoxylate aminotransferase (AGT), a key hepatic
enzyme in the detoxification of glyoxylate arising from multiple normal metabolic
pathways to glycine. Accumulation of glyoxylate, a precursor of oxalate, leads to
the overproduction of oxalate in the liver, which accumulates to high levels in
kidneys and urine. Crystalization of calcium oxalate (CaOx) in the kidney
ultimately results in renal failure. Currently, the only treatment effective in
reduction of oxalate production in patients who do not respond to high-dose
vitamin B6 therapy is a combined liver/kidney transplant. We explored an
alternative approach to prevent glyoxylate production using Dicer-substrate small
interfering RNAs (DsiRNAs) targeting hydroxyacid oxidase 1 (HAO1) mRNA which
encodes glycolate oxidase (GO), to reduce the hepatic conversion of glycolate to
glyoxylate. This approach efficiently reduces GO mRNA and protein in the livers
of mice and nonhuman primates. Reduction of hepatic GO leads to normalization of
urine oxalate levels and reduces CaOx deposition in a preclinical mouse model of
PH1. Our results support the use of DsiRNA to reduce liver GO levels as a
potential therapeutic approach to treat PH1.