Multipurpose efficacy of ZnO nanoparticles coated by the crustacean immune molecule β-1, 3-glucan binding protein: Toxicity on HepG2 liver cancer cells and bacterial pathogens

The effective treatment of cancer and bacterial pathogens are two key challenges in modern nanomedicine. Here, zinc oxide nanoparticles (ZnO NPs) were fabricated using the crustacean immune molecule beta-1, 3- glucan binding protein (Ph beta-GBP, 100 kDa) purified from the heamolymph of Paratelphusa hydrodromus. beta-GBP coated zinc oxide nanoparticles (Ph beta-GBP-ZnO NPs) were characterized by UV-vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and high resolution-transmission electron microscopy (HR-TEM) analyses. Ph beta-GBP-ZnO NPs inhibited the growth of Staphylococcus aureus and Proteus vulgaris. Protein and nucleic acid leakage assays showed that Ph beta-GBP-ZnO NPs facilitate membrane permeability leading to cell death. The antibacterial activity of Ph beta-GBP-ZnO NPs was due to the high level of reactive oxygen species (ROS) release from bacterial cells post-treatment with 75 mu g/mL of Ph beta-GBP-ZnO NPs. Confocal laser scanning microscopy pointed out that biofilm thickness was highly reduced post-treatment with nanoparticles. Cytotoxicity on human liver carcinoma (HepG2) cells highlighted that 75 mu g/mL of Ph beta-GBP-ZnO NPs inhibited viability of HepG2 cells. Phase contrast microscopy showed key morphological changes of HepG2 cells post-treatment with Ph beta-GBP-ZnO NPs. Overall, Ph beta-GBP-ZnO NPs can be further considered for the development of novel drugs against microbial pathogens and HepG2 cells. (C) 2017 Elsevier B.V. All rights reserved.