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    Antioxidative and antiproliferative effects of propolis-reduced silver nanoparticles
    (Techno Press, 2021) Tan, Gamze; İlk, Sedef; Foto, Fatma Z.; Foto, Egemen; Sağlam, Necdet
    In this study, phytochemicals present in Propolis Extract (PE) were employed as reducing and stabilizing reagents to synthesize silver nanoparticles. Three propolis-reduced silver nanoparticles (P-AgNPs1-3) were synthesized using increasing amounts of PE. P-AgNPs were treated with different cancer cells -lung (A549), cervix (HeLa) and colon (WiDr) for 24, 48 and 72 h to evaluate their anti -proliferative activities. A non-cancerous cell type (L929) was also used to test whether suppressive effects of P-AgNPs on cancer cell proliferation were due to a general cytotoxic effect. The characterization results showed that the bioactive contents in propolis successfully induced particle formation. As the amount of PE increased, the particle size decreased; however, the size distribution range expanded. The antioxidant capacity of the particles increased with increased propolis amounts. P-AgNP1 exhibited almost equal inhibitory effects across all cancer cell types; however, P-AgNP2 was more effective on HeLa cells. P-AgNPs3 showed greater inhibitory effects in almost all cancer cells compared to other NPs and pure propolis. Consequently, the biological effects of P-AgNPs were highly dependent on PE amount, NP concentration, and cell type. These results suggest that AgNPs synthesized utilizing propolis phytochemicals might serve as anti -cancer agents, providing greater efficacy against cancer cells.
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    Antiproliferative and genotoxic activities in L929 and HeLa cell lines, mutagenic effects in Salmonella strains of novel benzoxazole derivatives
    (Colegio de Farmaceuticos de la Provincia de Buenos Aires, 2016) Öksüzoğlu, Emine; Foto, Egemen; Zilifdar, Fatma; Ertan-Bolelli, Tuğba; Bolelli, Kayhan
    Some novel fused heterocyclic compounds of 2,5-disubstituted-benzoxazole derivatives, which were previously synthesized by our group, were investigated for their mutagenic properties on Salmonella typhimurium TA 98 and TA 100 strains, cytotoxic activity in L929 and HeLa cell lines by Sulforhodamine B (SRB) cytotoxicity test, and genotoxic potentials in the comet assay. By using Ames/Salmonella assay in the presence of S9 fraction, B22 (5-nitro-2-(p-nitrobenzyl)benzoxazole) was found to be mutagenic in both S. typhimurium TA98 and TA100 strains at all tested doses. IC50 values which were evaluated by SRB cytotoxicity assay revealed that B11 (2-(p-nitrobenzyl)benzoxazole) (IC50 = 99.16 µM) was the most anti-proliferative compound on HeLa cancer cells. Compounds were also tested for their genotoxicity by using comet assay, and it was found that all the compounds had DNA-damaging genotoxic activity on HeLa cells. The comet assay results showed that B11 produced DNA damage at lower concentrations than the other compounds tested on HeLa cancer cells. The results obtained from all the tests suggest that B11 could be a good candidate as a new anticancer agent. © 2016, Colegio de Farmaceuticos de la Provincia de Buenos Aires. All rights reserved.