Structural alterations in the rat kidney after acute arsine exposure

Area of Science:

• Toxicology
• Nephrology
• Environmental Health

Background:

• The precise mechanism of arsine (AsH3) toxicity, particularly its impact on kidney function, remains incompletely understood.
• Arsine exposure can lead to significant health issues, necessitating a clearer understanding of its toxicological pathways.

Purpose of the Study:

• To investigate the toxicity of arsine (AsH3) and its hemolytic products on renal cells and the isolated rat kidney.
• To model kidney dysfunction induced by AsH3 exposure and differentiate the roles of AsH3 and its metabolites.

Main Methods:

• Assessed toxicity in primary renal cortical epithelial cells using XTT bioreduction, intracellular potassium (K+) leakage, and lactate dehydrogenase (LDH) leakage.
• Evaluated the toxicity of AsH3 and AsH3-produced hemolysate (spiked with As(III)) in isolated rat kidneys.
• Examined cellular damage in glomerular, peritubular endothelial, and tubular epithelial cells.

Main Results:

• Early toxicity in isolated cells (1 hour) was largely independent of arsenic species, while later toxicity (4 hours) was driven by arsenite (As(III)).
• Unchanged AsH3 demonstrated significant toxicity to the isolated rat kidney, primarily affecting endothelial and tubular cells within minutes.
• AsH3-produced hemolysate showed delayed toxicity, suggesting a role for metabolites like As(III) in prolonged renal damage.

Conclusions:

• Early kidney dysfunction following AsH3 exposure is primarily caused by the parent compound.
• Subsequent renal damage is linked to AsH3-derived hemolytic products, potentially including arsenite (As(III)).
• These findings are crucial for understanding and managing AsH3 intoxication and its renal sequelae.