Inviting an author to review:
Find an author and click ‘Invite to review selected article’ near their name.
Search for authorsSearch for similar articles
11
views
0
recommends
+1 Recommend
1 collections
    1
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      An antiplasmodial depside from a nigerian lichen dirinaria picta, epiphytic on the oil palm Elaeis Guineense Translated title: Un dépsido antiplasmodial de un liquen nigeriano dirinaria picta, epífito en la palma de aceite Elaeis Guineense

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          This study investigated the anti-plasmodial and cytotoxic potentials of the chloroform (LCE) and ethanol (LEE) extracts from the foliose lichen Dirinaria picta with the view of isolating anti-malarial drug lead compound(s). In vitro anti-plasmodial and cytotoxicity assays were done using the plasmodium lactate dehydrogenase assay and human HeLa cervica cell lines respectively. The structure of the isolated compound was elucidated using spectroscopic techniques. The LCE yielded a novel antiplasmodial depside 1 (antiplasmodial IC50≈37 (μg/mL; cytotoxicity (IC50 >100 μg/mL; Selectivity index >2.7) and an impure fraction LC2 (antiplasmodial IC50 ≈ 79 μg/mL; cytotoxicity (IC50 >100 μg/mL; Selectivity index <1.3). The LEE (antiplasmodial IC50 ≈ 17 μg/mL; cytotoxicity (IC50 ≈ 62 μg/mL; Selectivity index ≈ 3.7) showed a significantly (p < 0.05) better anti-plasmodial activity though more cytotoxic compared to depside 1 and LC2.The depside 1, LC2 and LEE were less cytotoxic compared to emetine (cytotoxicity (IC50 = 0.02 μM ≈ 0.013 μg/mL) though not as active as the reference drugs chloroquine (antiplasmodial IC50 = 0.031 μM ≈ 0.016 μg/mL). This is the first time report on the anti-malarial potential of Nigerian lichens and the isolation of a novel anti-plasmodial depside 1.

          Translated abstract

          Este estudio investigo los potenciales anti-plasmodiales y citotoxicos de los extractos de cloroformo (LCE) y etanol (LEE) de liquenes foliosos Dirinaria picta con el objetivo de aislar el (los) compuesto (s) principal (es) del farmaco antipaludico. Los ensayos in vitro anti-plasmodial y de citotoxicidad se realizaron usando el ensayo de deshidrogenasa plasmodium lactato y las lineas celulares humanas HeLa cervica, respectivamente. La estructura del compuesto aislado se elucido usando tecnicas espectroscopicas. El LCE produjo un nuevo depsido antiplasmodial 1 (antiplasmodial IC50 ≈ 37 μg / ml; citotoxicidad (IC50 > 100 μg / ml; Indice de selectividad> 2,7) y una fraccion impura LC2 (antiplasmodial IC50≈ 79 μg / ml; citotoxicidad (IC50> 100) μg / mL; Indice de selectividad <1.3). El LEE (IC50 antiplasmodial ≈ 17 μg / mL; citotoxicidad (IC50 ≈ 62 μg / mL; Indice de selectividad ≈ 3.7) mostro una actividad antiplamodial significativamente mejor (p <0.05) aunque fue mas citotoxico en comparacion con depsido 1 y LC2. El depsido 1, LC2 y LEE fueron menos citotoxicos en comparacion con emetina (citotoxicidad (IC50 = 0.02 μM ≈ 0.013 μg / mL) aunque no tan activos como los medicamentos de referenda chloroquine (antiplasmodial IC50 = 0.031 μM = 0.016 μg / mL). Este es el primer informe sobre el potencial antipaludico de los liquenes nigerianos y el aislamiento de un nuevo depsido antiplamodial 1.

          Related collections

          Most cited references16

          • Record: found
          • Abstract: found
          • Article: not found

          Metabolic diversity of lichen-forming ascomycetous fungi: culturing, polyketide and shikimate metabolite production, and PKS genes.

          Lichens are composite and symbiotic organisms. Biologically, they often have been interpreted as one organism (fungi and algae associated within a common thallus), but taxonomically as a life form of ascomycetous fungi; as the lichen-forming fungus or "mycobiont" has been, in most cases, classified as the dominant symbiotic partner. About 46% of the ascomycota are lichen-forming, however, about 2-3% of the lichen fungi are basidiomycota. Lichen-forming fungi produce a great variety of secondary metabolites, biosynthetically derived from the acetyl polymalonyl, mevalonic and shikimate pathways. Thus, secondary metabolites comprise a significant proportion of the lichen thallus dry weight (0.1-5% or even more). The majority of secondary lichen products are aromatic polyketides, and a number of them has been shown to exhibit marked biological activity.
            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Cytotoxicity of plants from Malaysia and Thailand used traditionally to treat cancer.

            The SRB cytotoxicity assay was used to screen extracts and isolated constituents of some traditional medicinal plants from Malaysia and Thailand against two human cancer cell lines, COR L23 lung cancer cell line and MCF7 breast cancer cell line and the non-cancer MCF5 cell line. Five out of the seven species tested, i.e. Thai Alpinia galanga, Alpinia officinarum, Cayratia japonica, Physalis minima, Tabernaemontana divaricata, exhibited interesting cytotoxicity activity and this is the first report of cytotoxicity from any Cayratia species. Following bioassay-guided fractionation, 1'-acetoxychavicol acetate (48h exposure against COR L23 cells, IC(50) 7.8 microM against MCF7 cells, IC(50) 23.9 microM) was isolated as the major cytotoxic component of the Alpinia species, physalin F as the major cytotoxic component of Physalis minima (48 h exposure against COR L23 cells IC(50) 0.4 microM against MCF7 cells, IC(50) 0.59 microM). The Malaysian Alpinia galanga showed weak activity compared with the Thai sample and this was shown to be due to the relatively high amounts of 1'-acetoxychavicol acetate present in the Thai sample.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Comparative structural analysis and kinetic properties of lactate dehydrogenases from the four species of human malarial parasites.

              Parasite lactate dehydrogenase (pLDH) is a potential drug target for new antimalarials owing to parasite dependence on glycolysis for ATP production. The pLDH from all four species of human malarial parasites were cloned, expressed, and analyzed for structural and kinetic properties that might be exploited for drug development. pLDH from Plasmodium vivax, malariae, and ovale exhibit 90-92% identity to pLDH from Plasmodium falciparum. Catalytic residues are identical. Resides I250 and T246, conserved in most LDH, are replaced by proline in all pLDH. The pLDH contain the same five-amino acid insert (DKEWN) in the substrate specificity loops. Within the cofactor site, pLDH from P. falciparum and P. malariae are identical, while pLDH from P. vivax and P. ovale have one substitution. Homology modeling of pLDH from P. vivax, ovale, and malariae with the crystal structure of pLDH from P. falciparum gave nearly identical structures. Nevertheless, the kinetic properties and sensitivities to inhibitors targeted to the cofactor binding site differ significantly. Michaelis constants for pyruvate and lactate differ 8-9-fold; Michaelis constants for NADH, NAD(+), and the NAD(+) analogue 3-acetylpyridine adenine dinucleotide differ up to 4-fold. Dissociation constants for the inhibitors differ up to 21-fold. Molecular docking studies of the binding of the inhibitors to the cofactor sites of all four pLDH predict similar orientations, with the docked ligands positioned at the nicotinamide end of the cofactor site. pH studies indicate that inhibitor binding is independent of pH in the pH 6-8 range, suggesting that differences in dissociation constants for a specific inhibitor are not due to altered active site pK values among the four pLDH.
                Bookmark

                Author and article information

                Journal
                rbq
                Revista Boliviana de Química
                Rev. Bol. Quim
                Universidad Mayor de San Andrés (La Paz, La Paz, Bolivia )
                0250-5460
                April 2018
                : 35
                : 1
                : 31-39
                Affiliations
                [02] orgnameRhodes University orgdiv1Department of Chemistry South Africa
                [04] orgnameThe Royal Botanic Garden
                [01] orgnameUniversity of Port Harcourt orgdiv1Department of Pharmacognosy and Phytotherapy Nigeria ozadheoqhene.afieroho@ 123456uniport.edu.nq
                [03] orgnameRhodes University orgdiv1Department of Biochemistry and Microbiology South Africa
                Article
                S0250-54602018000100004 S0250-5460(18)03500100004
                e7c701af-3cb1-488d-86cb-a45135382818

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 30 April 2018
                : 06 January 2018
                : 25 April 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 20, Pages: 9
                Product

                SciELO Bolivia

                Categories
                Original Articles

                Lichens,Depside,Drug discovery,Cytotoxicity,Anti-plasmodial
                Lichens, Depside, Drug discovery, Cytotoxicity, Anti-plasmodial

                Comments

                Comment on this article