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2025-12-21

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cc by (c) Piergallini, C. et al., 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231386

Silicon-based nanopillars: a novel platform for tissue applications

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https://doi.org/10.1039/d5bm00763a

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Nanostructured surfaces are increasingly used for cell applications due to their enhanced interactions with numerous cell types; yet, their effects on tissues remain unexplored. To address this limitation, we designed vertical silicon nanopillar (Si-NP) arrays with high density, high aspect ratio and submicrometer diameter, as an optimized geometry based on previous cell-nanostructure studies. Using state-of-the-art in vitro and ex vivo assays, we examined adhesion and biocompatibility of biological samples of different origin and level of complexity -human epithelial-like cell lines, Drosophila imaginal discs and patient-derived lung cancer biopsies-laid on Si-NP arrays or unpatterned flat Si surfaces. Our results demonstrated that Si-NP arrays significantly improved cell and tissue adhesion while preventing oxidative damage and early apoptosis. Consistently, focused ion beam-scanning electron microscopy imaging of cells and tissues showed extended horizontal protrusions and limited vertical wrapping around Si-NP, revealing enhanced cell-NP interactions without cell/tissue penetration. In contrast, flat Si surfaces showed poor adhesion, increased apoptosis, and failed to support tumor biopsy attachment. Interaction with Si-NP arrays upregulated reactive oxygen species (ROS), yet mitochondria-associated ROS remained unchanged, and consequently apoptosis was not induced, indicating that the increased ROS arose from non-mitochondrial compartments and did not compromise viability. Notably, Si-NP arrays matched or outperformed biological responses on tissue culture plastic and Transwell-based assays, which are common in vitro and ex vivo substrates, respectively. These findings provide the first demonstration of the biological suitability of Si-NP arrays for tissue applications in research and clinical translation.

Matèries

Materials biomèdics, Nanoestructures, Compostos de silici, Adherència, Cèl·lules

Matèries (anglès)

Biomedical materials, Nanostructures, Silicon compounds, Adhesion, Cells

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Articles publicats en revistes (Biomedicina)
Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Genètica, Microbiologia i Estadística)
Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))
Articles publicats en revistes (Institut de Biomedicina (IBUB))
Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
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Citació

PIERGALLINI, Cristiano, et al. Silicon-based nanopillars: a novel platform for tissue applications. Biomaterials Science. 2025. Vol. 13, num. 24, pags. 6918-6931. ISSN 2047-4830. [consulted: 10 of September of 2026]. Available at: https://hdl.handle.net/2445/231386

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