An iTRAQ-based mitoproteomics approach for profiling the nephrotoxicity mechanisms of ochratoxin A in HEK 293 cells

Area of Science:

• Toxicology
• Mitochondrial Biology
• Proteomics

Background:

• Nephrotoxicity is a primary concern associated with Ochratoxin A (OTA) exposure.
• Mitochondria are a major source of reactive oxygen species (ROS) implicated in renal disease pathogenesis.
• Limited research exists on OTA's mitochondrial toxicity mechanisms using global protein expression analysis.

Purpose of the Study:

• To investigate Ochratoxin A's (OTA) mitochondrial toxicity mechanisms.
• To explore the protective effects of N-acetyl-L-cysteine (NAC) against OTA-induced damage.
• To utilize iTRAQ-based mitoproteomics for a comprehensive analysis.

Main Methods:

• Employed iTRAQ-based mitoproteomics on Human Embryonic Kidney 293 (HEK 293) cell mitochondria.
• Quantified and analyzed global mitochondrial protein expression changes.
• Assessed mitochondrial membrane potential (ΔΨm), ROS levels, and cell viability.

Main Results:

• OTA exposure decreased mitochondrial membrane potential (ΔΨm) and increased ROS production and cell death.
• Identified 66 differentially expressed proteins in response to OTA, primarily affecting the mitochondrial electron transport chain (mETC), protein synthesis, and stress responses.
• NAC treatment largely reversed OTA-induced protein expression alterations and cellular damage.

Conclusions:

• OTA induces nephrotoxicity through mitochondrial dysfunction, including mETC perturbation and oxidative stress.
• NAC demonstrates significant protective potential against OTA-induced mitochondrial damage at the proteomic level.
• A hypothetical model for OTA-induced mitochondrial damage is proposed, highlighting key pathways for further investigation.