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Silicon-based nanopillars: a novel platform for tissue applications.

Cristiano Piergallini^1,2, Natalia Díaz-Valdivia³, Alba Deyà⁴

¹Department of Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, 08028 Barcelona, Spain.

Biomaterials Science

|November 4, 2025

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Summary

Vertical silicon nanopillar (Si-NP) arrays enhance cell and tissue adhesion, preventing damage and apoptosis. These nanostructured surfaces show promise for research and clinical applications, outperforming traditional substrates.

Area of Science:

Biomaterials Science
Cell Biology
Tissue Engineering

Background:

Nanostructured surfaces enhance cell interactions but their tissue-level effects are unknown.
Optimized silicon nanopillar (Si-NP) arrays were designed based on prior cell-nanostructure research.

Purpose of the Study:

To investigate the effects of Si-NP arrays on tissue adhesion and biocompatibility.
To compare Si-NP arrays with flat silicon surfaces and standard cell culture substrates.

Main Methods:

Utilized in vitro and ex vivo assays with cell lines, Drosophila imaginal discs, and patient-derived lung cancer biopsies.
Employed focused ion beam-scanning electron microscopy for detailed cell-nanostructure interaction analysis.
Assessed cell adhesion, apoptosis, reactive oxygen species (ROS) production, and mitochondrial function.

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Main Results:

Si-NP arrays significantly improved cell and tissue adhesion compared to flat silicon surfaces.
Enhanced adhesion on Si-NP arrays prevented oxidative damage and early apoptosis, with limited cell/tissue penetration.
Si-NP arrays matched or exceeded performance of tissue culture plastic and Transwell assays for biological responses.

Conclusions:

Si-NP arrays demonstrate significant biological suitability for tissue applications.
These findings support the potential of Si-NP arrays in research and clinical translation.
Nanostructured surfaces offer a promising platform for advanced tissue engineering and regenerative medicine.