Date: 26 November 2013
Secondary metabolites, 3D structure: Trivial name – viriditoxin
Copyright: n/a
Notes:
Species: A. brevipes, A. fumigatus, A. viridinutansSystematic name: (8,8′-Bi-1H-naphtho(2,3-c)pyran)-3,3′-diacetic acid, 3,3′,4,4′-tetrahydro- 9,9′,10,10′-tetrahydroxy-7,7′-dimethoxy-1,1′-dioxo-, dimethyl ester (8,8′-BI-1H-NAPHTHO(2,3-c)PYRAN)-3,3′-DIACETIC ACID, 3,3′,4,4′-TETRAHYDRO-9,9′,1 3,3′,4,4′-Tetrahydro-9,9′,10,Molecular formulae: C34H30O14Molecular weight: 662.594Chemical abstracts number: 35483-50-2Selected references: CURRENT STATUS OF RESEARCH IN MYCOTOXIN-INDUCED TERATOGENESIS HOOD RD; SZCZECH GM EXCERPTA MED INT CONGR SER (426):96,1977TOXINS STACK ME SHERMA, J. AND B. FRIED (ED.). CHROMATOGRAPHIC SCIENCE SERIES, VOL. 71. HANDBOOK OF THIN-LAYER CHROMATOGRAPHY, SECOND EDITION. XV+1104P. MARCEL DEKKER, INC.: NEW YORK, NEW YORK, USA; BASEL, SWITZERLAND. ISBN 0-8247-9454-0.; 71 (0). 1996. 1033-1045.DAVIS ND. Sterigmatocystin and other mycotoxins produced by Aspergillus spp.. J FOOD PROT; 44 (9). 1981. 711-714, 722. Lillehoj EB, Milburn MS. Appl Microbiol. 1973 Aug;26(2):202-5. Viriditoxin production by Aspergillus viridi-nutans and related species.Toxicity: Intraperitoneal LD50 2.8 mg/kg body-weight in male mice.mouse LD50 intraperitoneal 2800ug/kg (2.8mg/kg) CRC Handbook of Antibiotic Compounds, Vols.1- , Berdy, J., Boca Raton, FL, CRC Press, 1980Vol. 5, Pg. 408, 1981.
Images library
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Image a. 3 yr old boy with CNS aspergillosis pt TS. MRI scan pre-amphotericin B
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Section though unfixed brain showing large pale area of infarction deep in the parietal cortex, in which Aspergillus hyphae were seen histologically. The patient developed disseminated aspergillosis after a prolonged stay in intensive care after contracting severe community acquired pneumonia.
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The woman had received a renal transplant several months prior to developing a stroke with reduced consciousness. The enhanced CT scan of her brain showed multiple ring-enhancing lesions bilaterally with little surrounding oedema. Biopsy confirmed invasive aspergillosis on histology and culture.
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Further details
Image A. Multiple ring enhancing abscesses with substantial surrounding oedema was demonstrated. He had no focal neurological deficits. A needle aspiration confirmed the clinical impression of cerebral aspergillosis by culture and microscopy.
Image B. Resolution of cerebral aspergillosis, pt MN. Focal scars with some surrounding oedema are seen in the site of the prior abscesses.
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Contrast enhanced CT scan of the brain showing unequivocally 2 hypodense lesions, one in the left basal ganglia and one in the right occipital cortex. There is the possibility of another smaller left sided occiptal cortex. These lesions do not have the appearance of abscesses, but rather of ischaema.
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Unenhanced CT scan of the brain in an allogeneic bone marrow transplant recipient demonstrating a large, variably hypodense lesion in the area of the left basal ganglia and possible additional lesions in the posterior parietal and/or occipital cortex.
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A. versicolor by microscopy showing very long thin conidiophores.
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Pigmentation of Aspergillus versicolor colonies ranged from pale green to greenish-beige, pink-green, dark green and brown. Reverse is usually reddish. The growth rate is usually slow. Cultured on Sabouraud dextrose agar with chloramphenicol.
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A Colonies on MEA after one week; B, C conidial heads with tip of conidiophire, x920; D conidial head, x 2330; E conidial heads x920
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Cultures were grown on malt extract agar. Image kindly provided by Niall Hamilton.
