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Nephrotoxicity instead of immunotoxicity of OTA is induced through DNMT1-dependent activation of JAK2/STAT3 signaling pathway by targeting SOCS3

  • Fang Gan
  • Xuan Zhou
  • Yajiao Zhou
  • Lili Hou
  • Xingxiang Chen
  • Cuiling Pan
  • Kehe HuangEmail author
Organ Toxicity and Mechanisms
  • 217 Downloads

Abstract

Ochratoxin A (OTA) is reported to induce nephrotoxicity and immunotoxicity in animals and humans. However, the underlying mechanism and the effects of OTA on DNA damage have not been reported until now. The present study aims to investigate OTA-induced cytotoxicity and DNA damage and the underlying mechanism in PK15 cells and PAMs. The results showed that OTA at 2.0–8.0 µg/mL for 24 h induced cytotoxicity and DNA damage in PK15 cells and PAMs as demonstrated by decreasing cell viabilities and mRNA levels of DNA repair genes (OGG1, NEIL1 and NEIL3), increasing LDH release, Annexin V staining cells, apoptotic nuclei and the accumulation of γ-H2AX foci. OTA at 2.0–8.0 µg/mL increased DNMT1 and SOCS3 mRNA expressions about 2–4 fold in PK15 cells or 1.3–2 fold in PAMs. OTA at 2.0–8.0 µg/mL increased DNMT1, SOCS3, JAK2 and STAT3 protein expressions in PK15 cells or PAMs. DNMT inhibitor (5-Aza-2-dc), promoted SOCS3 expression, inhibited JAK2 and STAT3 expression, alleviated cytotoxicity, apoptosis and DNA damage induced by OTA at 4.0 µg/mL in PK15 cells. While, in PAMs, 5-Aza-2-dc had no effects on SOCS3 expression induced by OTA at 4.0 µg/mL, but inhibited JAK2 and STAT3 expression, and alleviated cytotoxicity, apoptosis and DNA damage induced by OTA. JAK inhibitor (AG490) or STAT3-siRNA alleviated OTA-induced cytotoxicity and DNA damage in PK15 cells or PAMs. Taken together, nephrotoxicity instead of immunotoxicity of OTA is induced by targeting SOCS3 through DNMT1-mediated JAK2/STAT3 signaling pathway. These results provide a scientific and new explanation of the underlying mechanism of OTA-induced nephrotoxicity and immunotoxicity.

Keywords

Ochratoxin A Cytotoxicity DNA damage DNMT1 SOCS3 JAK2/STAT3 signaling pathway 

Notes

Acknowledgements

This study was funded by the Natural Science Foundation of Jiangsu Province (BK20160736), National Natural Science Foundation of China (31602123, 31772811), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (Jiangsu, China).

Author contributions

Study concept and design: KH. Acquisition of data: FG, XZ, ZJ, LH, KH. Analysis and interpretation of data: FG, XZ, ZJ, XC, CP. Drafting of the manuscript: FG, KH. Critical revision of the manuscript for important intellectual content: KH, FG. Statistical analysis: FG, KH. Obtained funding: KH and FG. All authors read and approved the final manuscript.

Compliance with ethical standards

Conflict of interest

We do not have any commercial associations that might create a conflict of interest in connection with this article.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Veterinary MedicineNanjing Agricultural UniversityNanjingChina
  2. 2.Institute of Nutritional and Metabolic Disorders in Domestic Animals and FowlsNanjing Agricultural UniversityNanjingChina
  3. 3.MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary MedicineNanjing Agricultural UniversityNanjingChina

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