title: Benzopyrans from Curvularia sp., an endophytic fungus associated with Ocotea corymbosa (Lauraceae).
abstract: An isolate of Curvularia sp. was obtained from the leaves of Ocotea corymbosa, a native plant of the Brazilian Cerrado. The ethyl acetate extract from culture of this fungus afforded two benzopyran derivatives: (2'S)-2-(propan-2'-ol)-5-hydroxy-benzopyran-4-one (2) and 2,3-dihydro-2-methyl-benzopyran-4,5-diol (4); and two known benzopyrans: 2-methyl-5-methoxy-benzopyran-4-one (1) and (2R)-2,3-dihydro-2-methyl-5-methoxy-benzopyran-4-one (3). The structures of 2 and 4 were established on the basis of comprehensive spectroscopic analysis, mainly using 1D and 2D NMR experiments. The benzopyrans 1 and 2 showed weak in vitro antifungal activity against Cladosporium sphaerospermum and C. cladosporioides. Analyses of the biological activities were also carried out on HeLa (human cervix tumor) and CHO (Chinese hamster ovary) cells, aiming to evaluate their potential effects on mammalian cell line proliferation. Results from both cell lines indicated that compound 2 was able to induce cell proliferation: 70% on HeLa cells and 25% on CHO cells.
authors.affiliation: NuBBE-Núcleo de Bioensaio, Biossíntese e Ecofisiologia de Produtos Naturais, Instituto de Química, Universidade Estadual Paulista, CP 355, CEP 14801-970, Araraquara, SP, Brazil.
authors.forename: Helder Lopes
authors.initials: HL
authors.lastname: Teles
authors.forename: Geraldo Humberto
authors.initials: GH
authors.lastname: Silva
authors.forename: Ian
authors.initials: I
authors.lastname: Castro-Gamboa
authors.forename: Vanderlan da Silva
authors.initials: Vda S
authors.lastname: Bolzani
authors.forename: José Odair
authors.initials: JO
authors.lastname: Pereira
authors.forename: Claudio Miguel
authors.initials: CM
authors.lastname: Costa-Neto
authors.forename: Renato
authors.initials: R
authors.lastname: Haddad
authors.forename: Marcos Nogueira
authors.initials: MN
authors.lastname: Eberlin
authors.forename: Maria Claudia Marx
authors.initials: MC
authors.lastname: Young
authors.forename: Angela Regina
authors.initials: AR
authors.lastname: Araújo
mesh_terms: D000818:Animals; D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001203:Ascomycota / Q000737:chemistry* / Q000254:growth & development; D001578:Benzopyrans / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D006224:Cricetinae; D003412:Cricetulus; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D015394:Molecular Structure; D027444:Ocotea / Q000382:microbiology*
chemical_list: D000935:Antifungal Agents; D000970:Antineoplastic Agents; D001578:Benzopyrans