Abstract
Three new tetramic acid derivatives, tolypocladenols A1, A2, and B (1-3), a new pyridone alkaloid, tolypyridone A (4), and a new coumarin derivative, 3,8-dihydroxy-4-(4-hydroxyphenyl)-6-methylcoumarin (5), together with four known compounds (6-9) were isolated from the endolichenic fungus Tolypocladium cylindrosporum, which inhabits the lichen Lethariella zahlbruckneri. Structures of these compounds were determined by comprehensive analysis of spectroscopic data and single-crystal X-ray diffraction determination. Bioassay of the isolated compounds found that pyridoxatin (7) was cytotoxic to human cancer cells by induction of G0/G1 cell cycle arrest and apoptosis.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Alkaloids / chemistry
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Alkaloids / isolation & purification*
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Alkaloids / pharmacology
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Antineoplastic Agents / chemistry
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Antineoplastic Agents / isolation & purification*
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Antineoplastic Agents / pharmacology
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Cell Cycle / drug effects
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Drug Screening Assays, Antitumor
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Humans
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Molecular Structure
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Pyridones / chemical synthesis
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Pyridones / chemistry
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Pyridones / isolation & purification*
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Pyridones / pharmacology
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Pyrrolidinones / chemistry
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Pyrrolidinones / isolation & purification*
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Pyrrolidinones / pharmacology
Substances
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Alkaloids
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Antineoplastic Agents
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Pyridones
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Pyrrolidinones
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tolypyridone A
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tetramic acid