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Cellular characterization of leukotoxin diol-induced mitochondrial dysfunction.

M F Sisemore¹, J Zheng, J C Yang

¹Department of Entomology, University of California, Davis, California 95616, USA.

Archives of Biochemistry and Biophysics

|July 27, 2001

Summary

Leukotoxin diol, a metabolite of leukotoxin, causes cell death by disrupting mitochondrial function. Cyclosporin A protects against this toxicity, suggesting a therapeutic target for acute respiratory distress syndrome.

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Area of Science:

Biochemistry
Cell Biology
Toxicology

Background:

Leukotoxin, a linoleic acid epoxide, is linked to acute respiratory distress syndrome.
Leukotoxin diol formation by epoxide hydrolase is a hypothesized activation step.

Purpose of the Study:

To investigate the role of mitochondria in leukotoxin diol toxicity.
To determine if leukotoxin diol activates the mitochondrial permeability transition.

Main Methods:

Assessed cellular toxicity of leukotoxin diol in human and insect cells.
Evaluated mitochondrial integrity using cell- and organelle-based assays.
Examined the effect of cyclosporin A on leukotoxin diol toxicity in vitro and in vivo.

Main Results:

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Leukotoxin diol induced acute cellular toxicity.
Leukotoxin diol specifically activated the mitochondrial permeability transition, leading to cytochrome c release and cell death.
Cyclosporin A inhibited these toxic effects and reduced in vivo toxicity.

Conclusions:

Leukotoxin diol disrupts mitochondrial function via the mitochondrial permeability transition.
This pathway represents a key mechanism in leukotoxin-induced cellular toxicity.
Targeting the mitochondrial permeability transition may offer a therapeutic strategy for leukotoxin-related conditions.