The current study was aimed to synthesized zinc oxide nanoparticles (ZnONPs) using aqueous extract of olive leaves (OLE), which is very simple and eco-friendly method. ZnONPs were formed by dissolving of OLE in zinc oxide solution with adjusted pH to 12. Zinc acetate dehydrate reduced to ZnONPs during mixing with OLE associated with change of the color solution from white to pale yellow color within a few minutes. The synthesized OLEZnONPs were separated by centrifugation (4000rpm/ 5min) , then characterized by Fourier Transmission Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) and Field emission-Scanning Electron Microscopy (FE-SEM) methods. The results of FT-IR showed that the functional group related to Zn-O at (433.98 to 416.67 cm_1), whereas X-RD at 2 theta diagnose the type of oxide formation as ZnO and determined particle size in range (20 – 30 nm). Besides, SEM image was showed the presence of hexagonal shape of ZnO nanoparticles (42.87nm). Therefore, the biogenic synthesis of zinc oxide nanoparticles using Olea Europaea leaves was simple, low coast, can be an alternative to chemical synthesis and the possibility of using in biomedicine field

This study aimed to investigate the protective influence of olive leave extract zinc oxidenanoparticles (OLEZnONPs) complex against gentamicin–induced kidney dysfunctions ingoats. Twenty five adult female goats were randomly divided into five equal groups andtreated as follows: control group (C) administered sterile distilled water (IM) for 10 days,group G administered 25 mg/kg BW gentamicin (IM) for 7 days, group Z administered 10μg/kg BW of OLEZnONPs (IP) for 3 days, group GTZ administered 25 mg/kg BW gentamicin(IM) for 7 days and then 10 μg/kg BW of OLEZnONPs (IP) for 3 days, group GWZadministered 25 mg/kg BW gentamicin (IM) and 10 μg/kg BW of OLEZnONPs (IP) togetherfor first 3 days and then followed by gentamicin only for 4 days. After seven days of theexperiment, the gene expression of kidney injury molcule-1(KIM-1) and neutrophilgelatinase-association lipocalin (NGAL) gene expression of kidney tissue were measured. Inaddition, samples of kidney were obtained for histopathological examination. Gentamicinmedication induced a marked elevation in kidney tissue KIM-1 and NGAL gene expressionin G and GTZ groups compared to control and other groups. Intraperitoneal treatment ofgoats with OLEZnONPs did not significantly affect NGAL and KIM-1 gene expression in Z,GWZ, and control groups. Histologically, in contrast to control, gentamicin induced moreextensive kidney damages such as necrotized glomeruli, atrophic glomeruli, and renaltubular epithelial necrosis, while it was found that these alterations in kidney tissues wereimproved in goats given OLEZnONPs with gentamicin compared to group G. In conclusion,our results demonstrate that OLEZnONPs reduce the deleterious effects of gentamicin withsignificantly decreasing of KIM-1 and NGAL gene expression and remodeling the histologicalchanges of kidney in goats