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The aim of this study is to evaluate the  in vitro  cytotoxic activity and cellular effects of previously prepared ZnO-NPs on murine cancer cell lines using brown seaweed ( Sargassum muticum ) aqueous extract. Treated cancer cells with ZnO-NPs for 72 hours demonstrated various levels of cytotoxicity based on calculated IC 50  values using MTT assay as follows: 21.7 ± 1.3  μ g/mL (4T1), 17.45 ± 1.1  μ g/mL (CRL-1451), 11.75 ± 0.8  μ g/mL (CT-26), and 5.6 ± 0.55  μ g/mL (WEHI-3B), respectively. On the other hand, ZnO-NPs treatments for 72 hours showed no toxicity against normal mouse fibroblast (3T3) cell line. On the other hand, paclitaxel, which imposed an inhibitory effect on WEHI-3B cells with IC 50  of 2.25 ± 0.4, 1.17 ± 0.5, and 1.6 ± 0.09  μ g/mL after 24, 48, and 72 hours treatment, respectively, was used as positive control. Furthermore, distinct morphological changes were found by utilizing fluorescent dyes; apoptotic population was increased via flowcytometry, while a cell cycle block and stimulation of apoptotic proteins were also observed. Additionally, the present study showed that the caspase activations contributed to ZnO-NPs triggered apoptotic death in WEHI-3 cells. Thus, the nature of biosynthesis and the therapeutic potential of ZnO-NPs could prepare the way for further research on the design of green synthesis therapeutic agents, particularly in nanomedicine, for the treatment of cancer.

Cytotoxic Effects of Biosynthesized Zinc Oxide Nanoparticles on Murine Cell Lines