AccScience Publishing / IJB / Online First / DOI: 10.36922/IJB025440455
RESEARCH ARTICLE
Early Access

Fibrous bioinks for the bioprinting of anisotropic scaffolds with micro-and nanoscale organization as a novel approach for in vitro skeletal muscle engineering

Gerardina Ruocco1,2,3 Elena Marcello1,2,3* Camilla Paoletti1,2,3 Massimo Salvi2,4 Alice Zoso1,2,3 Mattia Spedicati1,2,3 Irene Carmagnola1,2,3 Valeria Chiono1,2,3
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1 Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Turin, Italy
2 POLITOBioMed Lab, Politecnico di Torino, Turin, Italy
3 Interuniversity Center for the promotion of the 3Rs principles in teaching and research, Pisa, Italy
4 Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy
Received: 2 July 2025 | Accepted: 10 November 2025 | Published online: 10 November 2025
© 2025 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Replicating skeletal muscle architecture remains challenging in 3D bioprinting, as conventional bioinks lack multiscale directional cues. Herein, we propose a next-generation fibrous bioink composed of fragmented electrospun gelatin fibers (f-GFs), uniformly embedded in an alginate/gelatin hydrogel matrix (f-ALG/Gel). Upon micro-extrusion bioprinting, shear-induced f-GF alignment enabled the fabrication of microfilament-based scaffolds with intrinsic anisotropy. The resulting constructs exhibited high shape fidelity, viscoelastic properties, and physiologically relevant stiffness (Young’s modulus: 16.1 ± 1.7 kPa). In vitro studies using C2C12 murine myoblasts demonstrated that the embedded f-GFs provided strong topographical guidance, enhancing cell alignment and myogenesis. After 14 days of culture, the f-ALG/Gel scaffolds supported a 2.5-fold increase in myotube fusion index and length, alongside reduced angular dispersion. These effects were achieved without the need for biochemical induction with a differentiation medium, underscoring the key role of structural cues at the micro- and nanoscale on C2C12 differentiation and maturation. In conclusion, this work proposed a scalable, cell-compatible strategy to recapitulate the hierarchical organization of skeletal muscle tissue within 3D printed constructs. The platform holds broad potential for applications in regenerative medicine, skeletal muscle tissue modelling and the engineering of cultured meat.

Keywords
Fibrous bioinks
3D bioprinting
Anisotropy
Skeletal muscle
Topographical cue
Funding
This work was supported by the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (Grant Agreement No. 772168), through BIORECAR ERC Consolidator project (www.biorecar.polito.it). This work was supported by the European Research Council (ERC) under the European Union's Research and Innovation Programme (Grant Agreement No 101158332) for the ERC-2023-POC EMPATIC project.
Conflict of interest
Elena Marcello serves as the Editorial Board Member of the journal, but did not in any way involve in the editorial and peer-review process conducted for this paper, directly or indirectly. Other authors declare they have no competing interests
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing