LC/MS/MS-Based Liver Metabolomics to Identify Chronic Liver Injury Biomarkers Following Exposure to Arsenic in Rats

Area of Science:

• Environmental toxicology
• Metabolomics
• Hepatology

Background:

• Arsenic is a prevalent metalloid with known liver toxicity.
• The precise mechanisms underlying arsenic-induced liver injury remain poorly understood.
• Current treatments for arsenic toxicity are limited due to its complex nature.

Purpose of the Study:

• To investigate potential biomarkers and metabolic pathways affected by chronic arsenic exposure in Wistar rat livers.
• To elucidate the underlying mechanisms of arsenic-induced liver injury.
• To provide evidence for early diagnosis and prevention strategies for arsenism.

Main Methods:

• An integrated metabolomics approach using LC-Orbitrap Q Exactive™ HF-X mass spectrometry.
• Analysis of liver tissue and blood markers (arsenic, ALT, ALP, TBA) in rats exposed to arsenic for 24 weeks.
• Histopathological examination of liver tissues and statistical analysis of metabolite profiles.

Main Results:

• Significant increases in liver arsenic, ALT, ALP, and TBA levels were observed.
• Histopathology revealed hepatocyte swelling, cytoplasmic changes, and necrosis in arsenic-exposed rats.
• Metabonomic analysis identified 109 significantly altered metabolites, with 71 upregulated and 38 downregulated.
• Six key metabolic pathways (phenylalanine, pyruvate, glycolysis/gluconeogenesis, TCA cycle, thiamine, vitamin B6 metabolism) were significantly impacted.
• Thirteen differential metabolites were found to regulate these pathways.

Conclusions:

• Chronic arsenic exposure induces significant liver injury in Wistar rats.
• Altered metabolic pathways and identified metabolites serve as potential biomarkers for arsenic-induced liver damage.
• This research offers valuable insights into the mechanisms of arsenism and supports the development of diagnostic and therapeutic strategies.