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1.
Nat Prod Res ; 31(22): 2599-2603, 2017 Nov.
Article in English | MEDLINE | ID: mdl-28135874

ABSTRACT

A fungal strain of Aspergillus niger was recovered from sediments collected in the Northeast coast of Brazil (Pecém's offshore port terminal). Cultivation in different growth media yielded a new ester furan derivative, 1, along with malformin A1, malformin C, cyclo (trans-4-hydroxy-L-Pro-L-Leu), cyclo (trans-4-hydroxy-L-Pro-L-Phe), cyclo (L-Pro-L-Leu), cyclo (L-Pro-L-Phe), pseurotin D, pseurotin A, chlovalicin, cyclo (L-Pro-L-Tyr) and cyclo (L-Pro-L-Val). Compound 1 was cytotoxic against HCT-116 cell line, showing IC50 = 2.9 µg/mL (CI 95% from 1.8 to 4.7 µg/mL).


Subject(s)
Antineoplastic Agents/pharmacology , Aspergillus niger/chemistry , Antineoplastic Agents/chemistry , Brazil , Cyclohexanones/isolation & purification , Cyclohexanones/pharmacology , Dipeptides/isolation & purification , Dipeptides/pharmacology , Drug Screening Assays, Antitumor , Epoxy Compounds/isolation & purification , Epoxy Compounds/pharmacology , Furans/chemistry , Geologic Sediments/microbiology , HCT116 Cells , Humans , Inhibitory Concentration 50 , Magnetic Resonance Spectroscopy , Molecular Structure , Peptides, Cyclic/chemistry , Peptides, Cyclic/isolation & purification , Peptides, Cyclic/pharmacology , Pyrrolidinones/isolation & purification , Pyrrolidinones/pharmacology
2.
Nat Prod Res ; 29(16): 1545-50, 2015.
Article in English | MEDLINE | ID: mdl-25532964

ABSTRACT

A fungal strain of Aspergillus sp. (BRF 030) was isolated from the sediments collected in the northeast coast of Brazil, and the cytotoxic activity of its secondary metabolites was investigated against HCT-116 tumour cell line. The cytotoxicity-guided fractionation of the extracts from this fungus cultured in potato-dextrose-sea water for 14 days at room temperature yielded the hetero-spirocyclic γ-lactams pseurotin A (1), pseurotin D (2) and pseurotin FD-838 (7), the alkaloids fumitremorgin C (5), 12,13-dihydroxy fumitremorgin C (6), methylsulochrin (4) and bis(dethio)bis(methylthio)gliotoxin (3). Among them, fumitremorgin C (5) and 12,13-dihydroxy fumitremorgin C (6) were the most active. The cytotoxic activities of the extracts from Aspergillus sp. grown from 7 to 28 days were investigated, and they were associated with the kinetic production of the compounds. The most active extracts (14 and 21 days) were those with the highest relative concentrations of the compounds fumitremorgin C (5) and 12,13-dihydroxy fumitremorgin C (6).


Subject(s)
Antineoplastic Agents/chemistry , Aspergillus/chemistry , Antineoplastic Agents/isolation & purification , Aspergillus/isolation & purification , Brazil , Cell Line, Tumor/drug effects , Geologic Sediments/microbiology , Humans , Indoles/chemistry , Indoles/isolation & purification , Molecular Structure , Seawater/microbiology
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