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To study the biological fabrication and characterization of zinc oxide nanoparticles (ZnO NPs) using Gymnema sylvestre and their toxicity to breast cancer cells MCF-7.In the existing work, ZnO NPs were synthesized using leaf extract of the Indian medicinal plant Gymnema sylvestre and it was characterized by Particle size, Zeta potential, FT-IR, XRD and SEM analyses.This ZnO NPs to have potentially validated anticancer role in breast cancer cells MCF-7 in vitro approach.The plant-based synthesized ZnO NPs were evaluated against the inhibitory role on breast cancer cell lines. We significantly observed that ZnO-NPs induce efficient toxicity of MCF-7 cells by increasing ROS, mitochondrion membrane damage and apoptotic morphological alterations. These results stated that ZnO-NP induces Bax and Caspases and down-regulates Bcl-2 proteins in MCF-7 cells. Thus, the biologically synthesized ZnO NPs were identified as good performance to inhibit breast cancer cell growth even at low concentrations.

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