Percorrer por autor "Van Griensven, Leo J.L.D."
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- Chemical characterization and biological activity of Chaga (Inonotus obliquus), a medicinal “mushroom”Publication . Glamočlija, Jasmina; Ćirić, Ana; Nikolić, Miloš; Fernandes, Ângela; Barros, Lillian; Calhelha, Ricardo C.; Ferreira, Isabel C.F.R.; Soković, Marina; Van Griensven, Leo J.L.D.Chemical composition and biological properties of aqueous and ethanolic extracts of Inonotus obliquus (Pers.:Fr.) Pilat from different origins, i.e. of Finland, Russia, and Thailand, were studied. Concerning biological activity, antimicrobial, antiqourum, antioxidative, and antitumor and cytotoxic effects were tested. Oxalic acid was found as the main organic acid, with the highest amount in Russian aqueous extract. Gallic, protocatechuic and p-hydroxybenzoic acids were detected in all samples. I. obliquus extracts showed high antioxidant and antimicrobial activity. Extracts were tested at subMIC for anti-quorum sensing (AQS) activity in Pseudomonas aeruginosa and all of them showed definite AQS activity. The assays were done using twitching and swarming of bacterial cultures, as well as the amount of produced pyocyanin as QS parameters. All the extracts possessed good antitumor effect on four cells lines and did not show hepatotoxicity on porcine liver primary cells designed as PLP2. As the I. obliquus presence in Chaga conks is limited, further purification is necessary to draw quantitative conclusions. The presence of AQS activity in medicinal mushrooms suggests a broader anti-infectious disease protection than only immunomodulatory effects.
- Chemical characterization of the medicinal mushroom Phellinus linteus (Berkeley & Curtis) Teng and contribution of different fractions to its bioactivityPublication . Reis, Filipa S.; Barreira, João C.M.; Calhelha, Ricardo C.; Van Griensven, Leo J.L.D.; Ćirić, Ana; Glamočlija, Jasmina; Soković, Marina; Ferreira, Isabel C.F.R.Mushrooms are widely appreciated for their organoleptic qualities, being also recognized as good sources of bioactive compounds that provide antioxidant, antimicrobial and cytotoxic activities. Polysaccharides (including glucans) are often pointed out as the most bioactive compounds isolated from mushrooms, but other molecules such as triterpenoids, might also be highlighted for their bioactivity. In scientific research, when isolated compounds are used, potential synergistic effects might be lost. Accordingly, the bioactivity of Phellinus linteus was evaluated in selected fractions (polysaccharides, glucans and triterpenoids), as well as in the methanolic and ethanolic extracts. The best antioxidant and antibacterial activities were obtained with methanolic extract, while glucan and triterpenoid fractions gave the strongest antifungal activity. In contrast, ethanolic extract gave the best results in cytotoxic activity, indicating that the bioactive compounds present might act synergistically. The differentiated activity of P. linteus fractions and extracts could be useful to find antimicrobial, antioxidant and cytotoxic agents as alternatives to synthetic chemicals with application in agriculture, food industry or pharmacy.
- Cordyceps militaris (L.) link fruiting body reduces NCI-H460 cellular viability through a mechanism involving p53 and p21Publication . Bizarro, Ana; Ferreira, Isabel C.F.R.; Soković, Marina; Van Griensven, Leo J.L.D.; Sousa, Diana; Vasconcelos, M. Helena; Lima, Raquel T.Mushroom extracts are recognized by their numerous potential medicinal properties. Recently, a methanolic extract from Cordyceps militaris (L.) Link (an edible entomopathogenic fungus widely used in traditional Chinese medicine) has been shown to inhibit cell growth of several human tumour cell lines [1,2]. However, its mechanism of action remained unknown. The aim of the present work was to study the antitumour mechanism of action of the methanolic extract of C. militaris, in the NCI-H460 cell line which is representative of non-small cell lung cancer. Results showed that the extract reduced viable cell number (observed with the trypan blue exclusion assay) by: i) decreasing cellular proliferation (analysed with the BrdU incorporation assay), ii) inducing cell cycle arrest at GO/GI phase (analysed by flow cytometry following propidium iodide-PI labelling) and iii) increasing apoptosis (analysed by flow cytometry following Annexin V-FITC and PI labelling). In addition, results also showed that treatment with the extract increased the cellular levels of p53 and p21. Moreover, this study also showed evidences of DNA damage caused by this extract, since an increase in the levels ofp-H2A.X and 53BP1 were observed, together with an increase in the number of 53BP1 foci/cell. In conclusion, this extract reduced NCI-H460 cellular viability, possibly through a mechanism which involves DNA damage and p53.
- Cordyceps militaris (L.) Link fruiting body reduces the growth of a non-small cell lung cancer cell line by increasing cellular levels of p53 and p21Publication . Bizarro, Ana; Ferreira, Isabel C.F.R.; Soković, Marina; Van Griensven, Leo J.L.D.; Sousa, Diana; Vasconcelos, M. Helena; Lima, Raquel T.Cordyceps militaris (L.) Link, an edible entomopathogenic fungus widely used in traditional Chinese medicine, has numerous potential medicinal properties including antitumor activity. The methanolic extract of C. militaris fruiting body was recently shown to have tumor cell growth inhibitory activity in several human tumor cell lines. Nonetheless, the mechanism of action involved is still not known. This work aimed at further studying the effect of the methanolic extract of C. militaris regarding its antitumor mechanism of action, using the non-small cell lung cancer cell line (NCI-H460) as a model. Results showed that treatment with the extract decreased cellular proliferation, induced cell cycle arrest at G0/G1 and increased apoptosis. In addition, the extract increased the levels of p53 and p21. Moreover, an increase in p-H2A.X and 53BP1 levels, together with an increase in the number of 53BP1 foci/cell (all indicative of DNA damage), were also observed after treatment with the extract. This work suggests that this extract affected NCI-H460 cellular viability through a mechanism involving DNA damage and p53 activation. This further supports the potential of this extract as a source of bioactive compounds, which may be used in anticancer strategies.
- Cultivated strains of Agaricus bisporus and A. brasiliensis: chemical characterization and evaluation of antioxidant and antimicrobial properties for final healthy product - natural preservatives in yoghurtPublication . Stojković, Dejan; Reis, Filipa S.; Glamočlija, Jasmina; Ćirić, Ana; Barros, Lillian; Van Griensven, Leo J.L.D.; Ferreira, Isabel C.F.R.; Soković, MarinaAgaricus bisporus (J. E. Lange) Emil J. Imbach and Agaricus brasiliensis Wasser, M. Didukh, Amazonas & Stamets are edible mushrooms. We chemically characterized these mushrooms for nutritional value, hydrophilic and lipophilic compounds. The antioxidant and antimicrobial activities of methanolic and ethanolic extracts were assessed. Hepatotoxicity was also evaluated. The ethanolic extract of both species was tested for inhibition of Listeria monocytogenes growth in yoghurt. Both species proved to be a good source of bioactive compounds. A. brasiliensis was richer in polyunsaturated fatty acids and revealed the highest concentration of phenolic acids, and tocopherols. A. bisporus showed the highest monounsaturated fatty acids and ergosterol contents. A. brasiliensis revealed the highest antioxidant potential, and its ethanolic extract displayed the highest antibacterial potential; the methanolic extract of A. bisporus revealed the highest antifungal activity. A. brasiliensis possessed better preserving properties in yoghurt.
- A detailed comparative study between chemical and bioactive properties of Ganoderma lucidum from different originsPublication . Stojković, Dejan; Barros, Lillian; Calhelha, Ricardo C.; Glamočlija, Jasmina; Ćirić, Ana; Van Griensven, Leo J.L.D.; Soković, Marina; Ferreira, Isabel C.F.R.A detailed comparative study on chemical and bioactive properties of wild and cultivated Ganoderma lucidum from Serbia (GS) and China (GCN) was performed. This species was chosen because of their worldwide use as medicinal mushroom. Higher amounts of sugars were found in GS, while higher amounts of organic acids were recorded in GCN. Unsaturated fatty acids predominated over saturated fatty acids. GCN revealed higher antioxidant activity, while GS exhibited inhibitory potential against human breast and cervical carcinoma cell lines. No cytotoxicity in non-tumour liver primary cell culture was observed for the different samples. Both samples possessed antibacterial and antifungal activities, in some cases even better than the standard antimicrobial drugs. This is the first study reporting a comparative of chemical compounds and bioactivity of G. lucidum samples from different origins.
- Effect of Cordyceps militaris methanolic extract in NCI-H460 tumor cellsPublication . Bizarro, Ana; Ferreira, Isabel C.F.R.; Soković, Marina; Van Griensven, Leo J.L.D.; Vasconcelos, M. Helena; Lima, Raquel T.Mushroom extracts have been studied extensively for their potential antitumor effect in tumor cell lines and in animal models [1]. Recently, some of our collaborators have described that the methanolic extract from the medicinal mushroom Cordyceps militaris (L.) Link presented tumor cell growth inhibitory activity. In particular, this extract inhibited the growth of the nonsmall cell lung cancer (NSCLC) cell line NCI-H460, presenting a GI50 of approximately 50 μg/ml [2]. The aim of this work was to further study the effect of C. militaris methanolic extract in NCIH460 cells, regarding its mechanism of action. NCI-H460 cells were treated with C. militaris methanolic extract (at 25 and 50 μg/ml) for 48 h. Viable cell number was then assessed with the Trypan blue exclusion assay. Cellular proliferation was analyzed with the BrdU incorporation assay and cell cycle profile with flow cytometry following propidium iodide (PI) labeling. Levels of apoptotic cell death were determined with flow cytometry following Annexin V-FITC /PI labeling. Treatment of cells with the C. militaris extract caused a dose-dependent decrease in viable cell number. Moreover, a clear and strong decrease in cellular proliferation was observed. In addition, alterations in cell cycle profile were found, with a strong decrease in the S and G2/M phases of the cell cycle together with an increase in G0/G1 phase. Furthermore, treatment with the extract also induced apoptosis in this cell line. In conclusion, C. militaris methanolic extract was shown to interfere with cell proliferation, cell cycle and to induce apoptosis of NCI-H460 cells. Further studies will aim at further understanding the mechanism of action of this extract.
- An insight into antidiabetic properties of six medicinal and edible mushrooms: Inhibition of α-amylase and α-glucosidase linked to type-2 diabetesPublication . Stojković, Dejan; Smiljković, Marija; Ćirić, Ana; Glamočlija, Jasmina; Van Griensven, Leo J.L.D.; Ferreira, Isabel C.F.R.; Soković, MarinaAs a continuation of our search for biologically active mushroom species the present study investigates in vitro antidiabetic properties of six edible and medicinal mushroom species: Agaricus blazei Murrill, Coprinus comatus (O.F.Müll.) Pers., Cordyceps militaris (L.) Fr., Inonotus obliquus (Ach. ex Pers.) Pilát, Morchella conica Pers. and Phellinus linteus Berk. & M.A. Curtis. In vitro assays on α-amylase and α-glucosidase enzyme inhibition were performed with methanolic extracts of the selected mushrooms. Furthermore, we calculated the necessary daily intake of mushroom extracts and dry mushroom powders based on the equivalent doses of therapeutic drug acarbose given to diabetic patients per day. Our comparative study on enzyme inhibition showed that the most promising potential is ascribed to I. obliquus extract, while no inhibition of α-amylase was recorded with M. conica and C. militaris methanolic extract at the tested concentration. This comparative study is the first highlighting in vitro antidiabetic potential by inhibition of α-amylase and α-glucosidase with methanolic extracts; which makes the investigated speciesmore promising for the diabetes type-2 treatment by an additional and different mechanism of action.
- Nutrients and non-nutrients composition and bioactivity of wild and cultivated Coprinus comatus (O.F.Müll.) Pers.Publication . Stojković, Dejan; Reis, Filipa S.; Barros, Lillian; Glamočlija, Jasmina; Ćirić, Ana; Van Griensven, Leo J.L.D.; Soković, Marina; Ferreira, Isabel C.F.R.Mushrooms have been reported as sources of biomolecules with various potential. Coprinus comatus was studied to obtain information about this species, comparing cultivated and wild samples. Free sugars, fatty acids, tocopherols, organic acids and phenolic acids were analysed by chromatographic techniques coupled to different detectors. C. comatus methanolic extractwas tested for its antioxidant potential (reducing power, radical scavenging activity and lipid peroxidation inhibition) and antimicrobial properties (tested towards Gram positive and negative bacteria, and microfungi). The toxicity for liver cells was tested in porcine liver primary cells. Both studied samples revealed similar nutritional value and energy contribution. The cultivated sample revealed the highest content in free sugars, monounsaturated fatty acids and tocopherols, while the wild mushroom was richer in saturated and polyunsaturated fatty acids, organic acids and phenolic compounds. The cultivated species also revealed the highest antioxidant potential and antimicrobial activity (with exception towards Gram negative bacteria and Aspergillus ochraceus). Both species revealed no toxicity towards porcine liver cells. The present study proved that cultivated and wild mushrooms from the same species could be excellent options as food and as sources of nutritional and bioactive compounds. Furthermore, differences in wild and cultivated samples were comparatively investigated for the first time.
- A study on the medicinal mushroom Cordyceps militaris (L.) link: chemical characterization, antioxidant, antimicrobial and antiproliferative propertiesPublication . Reis, Filipa S.; Stojković, Dejan; Glamočlija, Jasmina; Ćirić, Ana; Van Griensven, Leo J.L.D.; Soković, Marina; Ferreira, Isabel C.F.R.The Cordyceps genus is well known for its medicinal properties. A number of bioactive constituents from Cordyceps species have been reported such as antibacterial, antifungal, immunopotentiating or antitumor agents [1]. The anti-inflammatory and anti-angiogenic properties of Cordyceps militaris (L.) Link have been reported as also the antioxidant activity of its cultured mycelium [2]. In this work, the chemical characterization of C. militaris was performed, includingbioactive compounds (free sugars, unsaturated fatty acids, tocopherols, organic acidsand phenolic compounds). The antioxidant potential of its methanolic extract was evaluated (reducing power, scavenging activity and lipid peroxidationinhibition) as also the antimicrobial activity (tested towards Gram positive and Gram negative bacteria and eight microfungi) and antiproliferative properties (tested in different human tumor cell lines). Mannitol and trehalose were the main free sugars found in this species (2.01 and 24.71 g/100 g dw, respectively). The fatty acid quantified in higher amounts was linoleic acid (68.00% of total fatty acids). a-Tocopherol was the only isoform of vitam in E detected (55.86 j.lg/1 00 g dw). The organic acids found in this mushroom were oxalic (0.33 g/1 00 g dw), citric (7.97 g/1 00 g dw) and fumaric (0 .1 3 g/100 g dw) acids. p-Hydroxybenzoic acid was the only phenolic acid quantified in C. militaris (0.02 mg/1 00 g dw), but cinnamic acid was also found (0. 11 mg/1 00 g dw). The lowest EC50 values for the antioxidant potential were presented in lipid peroxidation inhibition assays, namely in 13-carotene/l inoleate and TBARS assays (1.05 mg/ml and 0. 77 mg/ml, respectively). The methanolic extract also revealed strong antibacterial and antifungal activities, and it was able to inhibit the proliferation of MCF-7 (breast}, NCI-H460 (non-smalllung),HCT-15 (colon) and Hela (cervical) human carcinoma cell lines.