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Loss of Dact2 alleviates cisplatin-induced nephrotoxicity through regulation of the Igfl-MAPK pathway axis

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Abstract

Wnt signaling is a principal pathway regulating the essential activities of cell proliferation. Here, we investigated the effect of Wnt/β-catenin signaling on in vivo drug-induced renal injury through the deletion of Dact2, a Wnt antagonist, and deciphered the underlying mechanism. Wild-type (WT) and Dact2 knockout (KO) mice were administered a single intraperitoneal injection of cisplatin to induce renal injury. The injury was alleviated in Dact2 KO mice, which showed lower levels of blood urea nitrogen and creatinine. RNA sequencing revealed 194 differentially expressed genes (DEGs) between WT and Dact2 KO mouse kidney before cisplatin treatment. Among them, higher levels of Igf1, one of the Wnt target genes responsible for “Positive regulation of cell proliferation” in KO mice, were confirmed along with the induction of Ki67 expression. In RNA-seq analysis comparing WT and Dact2 KO mice after cisplatin treatment, genes related to “Apoptosis” and “Activation of mitogen-activated protein kinase (MAPK) activity” were among the downregulated DEGs in KO mice. These results were corroborated in western blotting of proteins related to apoptosis and proapoptotic MAPK pathway; the expression of which was found to be lower in cisplatin-treated KO mice. Importantly, β-catenin was found to directly bind to and regulate the transcription of Igf1, leading to the alleviation of cisplatin-induced cytotoxicity by the Wnt agonist, CHIR-99021. In addition, Igf1 knockdown accelerated cisplatin-induced cytotoxicity, accompanied by the MAPK upregulation. Our findings suggest that Dact2 knockout could protect cisplatin-induced nephrotoxicity by inhibiting apoptosis, possibly through the regulation of the Igf1-MAPK axis associated with Wnt/β-catenin signaling.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request. All generated RNA-seq were deposited into the National Center for Biotechnology Information (NCBI) Sequence Read Archive (SRA) under project accession PRJNA984810.

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Not applicable.

Abbreviations

AKI:

Acute kidney injury

BUN:

Blood urea nitrogen

ChIP:

Chromatin immunoprecipitation

Dact2 :

Dishevelled-associated antagonist of beta-catenin 2

DAVID:

Database for Annotation, Visualization and Integrated Discovery

DEGs:

Differentially expressed genes

FDR:

False discovery rate

GO:

Gene Ontology

IGF1:

Insulin-like growth factor 1

KEGG:

Kyoto Encyclopedia of Genes and Genomes

MAPK:

Mitogen-activated protein kinase

siRNA:

Small interfering RNA

TUNEL:

Terminal deoxynucleotidyl transferase dUTP nick end labeling

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Funding

This work was supported by the New Faculty Startup Fund from Seoul National University. This work was supported by the Basic Science Research Program (2021R1A2C1009563) through the National Research Foundation (NRF) of Korea, funded by the Ministry of Science and ICT (MSIT), Republic of Korea.

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Conceptualization of this research, conduct of experiments, acquisition and analysis of data, and drafting the manuscript: CK and WK. Material support, interpretation of data, and performance of statistical analysis: DHW and JK. Acquisition and analysis of data: DBH and NK. Interpretation of data: MK, YJ, and YIP. Conduct of experiments and interpretation of data: JWP. Conceptualization of this research and supervision and editing of final draft of the manuscript: JWY.

Corresponding author

Correspondence to Jun-Won Yun.

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Ethical approval for the experimental protocols was obtained from the Institutional Animal Care and Use Committee of the Catholic University of Korea (2020-022).

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The authors declare no competing interests.

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Kim, C., Kwak, W., Won, DH. et al. Loss of Dact2 alleviates cisplatin-induced nephrotoxicity through regulation of the Igfl-MAPK pathway axis. Cell Biol Toxicol 39, 3197–3217 (2023). https://doi.org/10.1007/s10565-023-09827-4

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