Cyclopiazonic acid mycotoxicosis in the dog

Area of Science:

• Veterinary Toxicology
• Mycotoxicology
• Pathology

Background:

• Cyclopiazonic acid (CPA) is a mycotoxin produced by Aspergillus species.
• Understanding CPA toxicity is crucial for animal health and food safety.

Purpose of the Study:

• To characterize the subacute oral toxicity of CPA in a canine model.
• To identify clinical signs, gross lesions, and microscopic pathology associated with CPA exposure.

Main Methods:

• Dogs were administered varying oral doses of purified CPA (0.05, 0.25, 0.5, 1.0 mg/kg) for 90 days.
• Control groups received no CPA.
• Clinical observations, gross necropsy, and histopathological examinations were performed.

Main Results:

• CPA induced anorexia, vomiting, diarrhea, dehydration, weight loss, and CNS depression.
• Significant gross lesions included alimentary tract hyperemia, hemorrhage, ulceration, renal infarcts, necrotizing epididymitis, and ulcerative dermatitis.
• Microscopic findings revealed vasculitis, lymphoid necrosis, karyomegaly, and decreased mitotic activity, often associated with vascular damage.

Conclusions:

• CPA exhibits significant subacute toxicity in dogs, affecting multiple organ systems.
• Vascular damage appears to be a key component in the pathogenesis of CPA-induced lesions.
• The study highlights the severe pathological consequences of CPA exposure in mammals.