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2018 ; 43
(2
): 164-173
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Hyperuricemia Induces Wnt5a/Ror2 Gene Expression, Epithelial-Mesenchymal
Transition, and Kidney Tubular Injury in Mice
#MMPMID29749985
Setyaningsih WAW
; Arfian N
; Suryadi E
; Romi MM
; Tranggono U
; Sari DCR
Iran J Med Sci
2018[Mar]; 43
(2
): 164-173
PMID29749985
show ga
BACKGROUND: Hyperuricemia contributes to kidney injury, characterized by tubular
injury with epithelial-mesenchymal transition (EMT). Wnt5a/Ror2 signaling drives
EMT in many kidney pathologies. This study sought to evaluate the involvement of
Wnt5a/Ror2 in hyperuricemia-induced EMT in kidney tubular injury. METHODS: A
hyperuricemia model was performed in male Swiss background mice (3 months old,
30-40 g) with daily intraperitoneal injections of 125 mg/kg body weight (BW) of
uric acid. The mice were terminated on day 7 (UA7, n=5) and on day 14 (UA14,
n=5). Allopurinol groups (UAl7 and UAl14, each n=5) were added with oral 50 mg/kg
BW of allopurinol treatment. The serum uric acid level was quantified, and
tubular injury was assessed based on PAS staining. Reverse transcriptase-PCR was
done to quantify Wnt5a, Ror2, E-cadherin, and vimentin expressions. IHC staining
was done for E-cadherin and collagen I. We used the Shapiro-Wilk for normality
testing and one-way ANOVA for variance analysis with a P<0.05 as significance
level using SPSS 22 software. RESULTS: The hyperuricemia groups had a higher uric
acid level, which was associated with a higher tubular injury score. Meanwhile,
the allopurinol groups had a significantly lower uric acid level and tubular
injury than the uric acid groups. Reverse transcriptase-PCR revealed
downregulation of the E-cadherin expression. While vimentin and collagen I
expression are upregulated, which was associated with a higher Wnt5a expression.
However, the allopurinol groups had reverse results. Immunostaining revealed a
reduction in E-cadherin staining in the epithelial cells and collagen I positive
staining in the epithelial cells and the interstitial areas. CONCLUSION:
Hyperuricemia induced tubular injury, which might have been mediated by EMT
through the activation of Wnt5a.