• JONAS P RAMOS

      Articles written in Journal of Biosciences

    • In vitro leishmanicidal, antibacterial and antitumour potential of anhydrocochlioquinone A obtained from the fungus Cochliobolus sp.

      FERNANDA F CAMPOS JONAS P RAMOS DJALMA M DE OLIVEIRA TAˆ NIA M A ALVES ELAINE M DE SOUZA-FAGUNDES CARLOS L ZANI FA´ BIO C SAMPAIO ATTILIO CONVERTI BETANIA B COTA

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      The bioassay-guided fractionation of the ethyl acetate extract of the fungus Cochliobolus sp. highlighted leishmanicidalactivity and allowed for anhydrocochlioquinone A (ANDC-A) isolation. MS, 1D and 2D NMR spectra of this compoundwere in agreement with those published in the literature. ANDC-A exhibited leishmanicidal activity with EC50 value of22.4 lg/mL (44 lM) and, when submitted to the microdilution assay against Gram-positive and Gram-negative bacteria,showed a minimal inhibitory concentration against Staphylococcus aureus ATCC 25295 of 128 lg/mL (248.7 lM). It wasalso active against five human cancer cell lines, showing IC50 values from 5.4 to 20.3 lM. ANDC-A demonstrated adifferential selectivity for HL-60 (SI 5.5) and THP-1 (SI 4.3) cell lines in comparison with Vero cells and was moreselective than cisplatin and doxorubicin against MCF-7 cell line in comparison with human peripheral blood mononuclearcells. ANDC-A was able to eradicate clonogenic tumour cells at concentrations of 20 and 50 lM and induced apoptosis inall tumour cell lines at 20 lM. These results suggest that ANDC-A might be used as a biochemical tool in the study oftumour cells biochemistry as well as an anticancer agent with durable effects on tumours.

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