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[Effect of sterigmatocystin on the toxinogenesis of the Aspergillus flavus group]
Abstract:
The aflatoxinogenesis of Aspergillus parasiticus is significantly enhanced by the presence, in the medium, of sterigmatocystin at a high level (35--50 microgram/ml); low concentrations, in the order of 175 microgram/ml, have no effect on the production of aflatoxins. During the period where the aflatoxinogenesis of the culture is high, no variation of the sterigmatocystin level is noted, Experiments with 14C-sterigmatocystin indicate that the mold does not utilize the metabolite itself as a precursor of aflatoxins.
Insights
High levels of sterigmatocystin significantly enhance aflatoxin production in Aspergillus parasiticus. However, the mold does not use sterigmatocystin as a precursor for aflatoxins.
Area of Science:
- Mycotoxicology
- Microbial Metabolism
Background:
- Aspergillus parasiticus produces aflatoxins, potent carcinogens.
- Sterigmatocystin is a mycotoxin structurally related to aflatoxins.
Purpose of the Study:
- To investigate the effect of sterigmatocystin on aflatoxin biosynthesis in Aspergillus parasiticus.
- To determine if sterigmatocystin serves as a precursor for aflatoxin production.
Main Methods:
- Culturing Aspergillus parasiticus in media supplemented with varying concentrations of sterigmatocystin.
- Measuring aflatoxin production levels.
- Utilizing 14C-labeled sterigmatocystin to trace metabolic pathways.
Main Results:
- High concentrations of sterigmatocystin (35-50 microgram/ml) significantly increased aflatoxinogenesis.
- Low concentrations of sterigmatocystin (175 microgram/ml) had no effect on aflatoxin production.
- No depletion of sterigmatocystin was observed during enhanced aflatoxin production, and 14C-sterigmatocystin was not incorporated into aflatoxins.
Conclusions:
- Sterigmatocystin acts as a potent enhancer of aflatoxinogenesis in Aspergillus parasiticus at high concentrations.
- Sterigmatocystin is not a direct precursor in the biosynthesis of aflatoxins by this fungus.