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Detection of macrocyclic trichothecene mycotoxin in a caprine (goat) tracheal instillation model

Department of Microbiology and Immunology, Texas Tech University Health Sciences Center, USA

Charles W Purdy

United States Department of Agriculture, Agricultural Research Service, Conservation and Production Research Laboratory, USA

Cynthia A Jumper

Department of Internal Medicine, Texas Tech University Health Sciences Center, USA

David C Straus

Department of Microbiology and Immunology, Texas Tech University Health Sciences Center, USA, david.straus{at}ttuhsc.edu

This study demonstrates the detection and dynamics of macrocyclic trichothecene mycotoxin (MTM) tissue loading using a commercially available assay in a goat model. The detection of MTMs has been difficult and complex due to the uncertainty of what tissues to examine and when to sample. Twelve goats (two groups of each) were instilled with Stachybotrys chartarum conidial suspension via the trachea. The first group was challenged repeatedly with fungal conidia containing 1 mg/kg of MTM per instillation whereas the second group was exposed once, to spores with a calculated concentration of 5 µg/kg of mycotoxin. These toxin estimates were generated by the QuantiTox^TM Kit assay; a conidium of S. chartarum possessed 8.5 pg of MTM. After repeated exposure of 3 days, MTM was detected in one of six animals. This animal and two others from the same group had mycotoxin detected in their serum 24 hours after challenge at a comparable level (1.69 ng/mL) to the six animals challenged with a single dose (2.02 ng/mL) at the same time post-instillation. Results showed that MTMs are detectable in experimental animals soon after challenge and contribute to the understanding of the role of these mycotoxins in the disease process following mold exposure.

Key Words: Caprine • feedlot • mycotoxin • respiratory • spore • Stachybotrys • trichothecene

This version was published on October 1, 2009

Toxicology and Industrial Health, Vol. 25, No. 9-10, 693-701 (2009)
DOI: 10.1177/0748233709348275


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