Erik A Yeash1, Lyndon Letwin2,3, Lada Malek2,3, Zacharias Suntres2,3,4, Kerry Knudsen5, Lew P Christopher1. 1. South Dakota School of Mines and Technology, Rapid City, SD, USA. 2. Department of Biology, Lakehead University, Thunder Bay, ON, Canada. 3. Biorefining Research Institute, Lakehead University, Thunder Bay, ON, Canada. 4. Northern Ontario School of Medicine, Lakehead University, Thunder Bay, ON, Canada. 5. University of Life Sciences, Prague, Czech Republic.
Abstract
BACKGROUND: Lichens provide a large array of compounds with the potential for pharmaceutical development. In the present study, extracts from three previously undescribed North American lichen species were examined for antioxidant, antibacterial and anticancer activities. RESULTS: The results from this study demonstrated the following: (i) Acarospora socialis ethanol extract exhibited significant DPPH antioxidant scavenging activities, which were concentration dependent; (ii) acetone and ethyl acetate extracts of Xanthoparmelia mexicana inhibited Gram-positive bacteria but had no effect on Gram-negative bacteria; X. mexicana acetone extract yielded a minimum inhibitory concentration (MIC) of 20.9 µg mL-1 against Staphylococcus aureus, and 41.9 µg mL-1 against Enterococcus faecalis; (iii) acetone extract of Lobothallia alphoplaca inhibited growth of cultured breast cancer MCF-7 cells with an effective concentration (EC50 ) of 87 µg mL-1 ; the MCF-7 cell cycle appears arrested in the G2 phase, whereas the DNA synthesis cell cycle (S) may be inhibited. CONCLUSION: New lichen species that possess strong biological activities have been identified. These lichens comprise secondary metabolites that possess antioxidant, antibacterial and anticancer properties.
BACKGROUND: Lichens provide a large array of compounds with the potential for pharmaceutical development. In the present study, extracts from three previously undescribed North American lichen species were examined for antioxidant, antibacterial and anticancer activities. RESULTS: The results from this study demonstrated the following: (i) Acarospora socialis ethanol extract exhibited significant DPPH antioxidant scavenging activities, which were concentration dependent; (ii) acetone and ethyl acetate extracts of Xanthoparmelia mexicana inhibited Gram-positive bacteria but had no effect on Gram-negative bacteria; X. mexicana acetone extract yielded a minimum inhibitory concentration (MIC) of 20.9 µg mL-1 against Staphylococcus aureus, and 41.9 µg mL-1 against Enterococcus faecalis; (iii) acetone extract of Lobothallia alphoplaca inhibited growth of cultured breast cancer MCF-7 cells with an effective concentration (EC50 ) of 87 µg mL-1 ; the MCF-7 cell cycle appears arrested in the G2 phase, whereas the DNA synthesis cell cycle (S) may be inhibited. CONCLUSION: New lichen species that possess strong biological activities have been identified. These lichens comprise secondary metabolites that possess antioxidant, antibacterial and anticancer properties.
Authors: Isabel Ureña-Vacas; Elena González-Burgos; Simona De Vita; Padreep K Divakar; Giuseppe Bifulco; M Pilar Gómez-Serranillos Journal: Evid Based Complement Alternat Med Date: 2022-06-02 Impact factor: 2.650
Authors: Violeta Popovici; Laura Bucur; Cerasela Elena Gîrd; Dan Rambu; Suzana Ioana Calcan; Elena Iulia Cucolea; Teodor Costache; Mădălina Ungureanu-Iuga; Mircea Oroian; Silvia Mironeasa; Verginica Schröder; Emma-Adriana Ozon; Dumitru Lupuliasa; Aureliana Caraiane; Victoria Badea Journal: Plants (Basel) Date: 2022-03-23