Green-Synthesized Zinc Oxide Nanoparticles from Mimosa pudica Show Biocompatibility with Bone Marrow Stem Cells in Lab Study
Researchers synthesized zinc oxide nanoparticles using extracts from the Mimosa pudica plant and found they preserved the viability, structure, and bone-forming capacity of human bone marrow stem cells in laboratory conditions. The nanoparticles, characterized by multiple spectroscopic and microscopic techniques, outperformed both raw plant extract and conventionally synthesized zinc oxide in maintaining cell metabolic activity. The findings suggest these green-synthesized nanoparticles could be a candidate material for musculoskeletal tissue engineering, though the research remains at an early preclinical stage.
A study posted to the bioRxiv preprint server describes the synthesis of zinc oxide nanoparticles (ZnONPs) derived from aqueous leaf extracts of Mimosa pudica, a plant known for its phytochemical content, and their evaluation against human bone marrow mesenchymal stromal cells (BM-MSCs). The nanoparticles, designated ZnOMP, were confirmed to have nanoscale dimensions and phytochemical surface capping through UV-Vis spectroscopy, FTIR, X-ray diffraction, SEM, EDS, and TEM analyses. In MTT metabolic activity assays conducted over one, three, and five days, ZnOMP maintained significantly higher cell viability than either the raw Mimosa pudica extract or conventionally synthesized ZnO nanoparticles at concentrations of 150 and 300 µg/mL. Fluorescence microscopy and automated morphometric analysis revealed that the plant extract alone caused the most pronounced changes in nuclear architecture, while ZnOMP kept cellular and nuclear morphology closer to untreated control cells. After 21 days of osteogenic induction, BM-MSCs treated with ZnOMP retained the ability to form a mineralized extracellular matrix, as confirmed by Alizarin Red S staining, indicating that osteogenic differentiation capacity was not impaired. The authors conclude that these green-synthesized nanoparticles combine biocompatibility with functional preservation of stem cell properties, positioning them as a potential platform for regenerative medicine applications targeting musculoskeletal disorders.
What's missing
As a preprint, this work has not yet undergone peer review. The study is entirely in vitro (cell culture), with no animal or human in vivo data, leaving pharmacokinetics, systemic toxicity, immune response, and therapeutic efficacy in living organisms unaddressed. Long-term stability of the nanoparticles and scalability of the green synthesis method are not discussed. The study does not compare ZnOMP against established or clinically used bone tissue engineering scaffolds or materials.
What different sources said
- bioRxivCenter
Mimosa pudica-derived zinc oxide nanoparticles preserve mesenchymal stromal cell viability, morphology, and osteogenic competence
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