Comparative toxicity of dietary T-2 toxin in rats and mice

Area of Science:

• Toxicology
• Animal Science
• Mycotoxicology

Background:

• T-2 toxin is a trichothecene mycotoxin produced by Fusarium species.
• Subacute exposure to T-2 toxin can cause various toxic effects in animals.
• Understanding species-specific responses is crucial for risk assessment.

Purpose of the Study:

• To compare the subacute toxic effects of dietary T-2 toxin in rats and mice.
• To evaluate dose-dependent and time-dependent responses to T-2 toxin.
• To identify potential species-specific differences in T-2 toxin toxicity.

Main Methods:

• Young male Wistar rats, young male Swiss mice, and juvenile Swiss mice were fed diets containing 10 or 20 ppm T-2 toxin for 2 or 4 weeks.
• Food consumption, weight gain, and clinical signs were monitored.
• Histopathological examinations were performed on lymphoid tissues, gastric mucosa, and bone marrow.

Main Results:

• Dose-related decreases in food consumption and weight gain were observed in all T-2 toxin-exposed animals.
• Hyperkeratosis, thymus atrophy, and lymphopenia occurred in all exposed groups, with juvenile mice showing the most severe effects.
• Juvenile mice at 20 ppm developed erythroid hypoplasia and severe anemia by 4 weeks, a potentially lethal effect not seen in rats or adult mice.

Conclusions:

• Dietary T-2 toxin induces similar alimentary and lymphoid effects in rats and mice, primarily due to food refusal and irritation.
• Mice and rats exhibit relative resistance to hematopoietic suppression by T-2 toxin.
• Juvenile mice are particularly susceptible to the hematotoxic effects of T-2 toxin at higher doses.