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One‐Step Bioprinting of Multi‐Channel Hydrogel Filaments Using Chaotic Advection: Fabrication of Pre‐Vascularized Muscle‐Like Tissues
Author(s) -
BolívarMonsalve Edna Johana,
CeballosGonzález Carlos Fernando,
ChávezMadero Carolina,
CruzRivas Brenda Guadalupe,
Velásquez Marín Silvana,
MoraGodínez Shirley,
ReyesCortés Luisa María,
Khademhosseini Ali,
Weiss Paul S.,
Samandari Mohamadmahdi,
Tamayol Ali,
Alvarez Mario Moisés,
Trujillode Santiago Grissel
Publication year - 2022
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.202200448
Subject(s) - biofabrication , fabrication , materials science , self healing hydrogels , gelatin , c2c12 , tissue engineering , nanotechnology , microfluidics , biomedical engineering , myocyte , myogenesis , chemistry , microbiology and biotechnology , medicine , biochemistry , alternative medicine , pathology , polymer chemistry , biology
The biofabrication of living constructs containing hollow channels is critical for manufacturing thick tissues. However, current technologies are limited in their effectiveness in the fabrication of channels with diameters smaller than hundreds of micrometers. It is demonstrated that the co‐extrusion of cell‐laden hydrogels and sacrificial materials through printheads containing Kenics static mixing elements enables the continuous and one‐step fabrication of thin hydrogel filaments (1 mm in diameter) containing dozens of hollow microchannels with widths as small as a single cell. Pre‐vascularized skeletal muscle‐like filaments are bioprinted by loading murine myoblasts (C2C12 cells) in gelatin methacryloyl ‐ alginate hydrogels and using hydroxyethyl cellulose as a sacrificial material. Higher viability and metabolic activity are observed in filaments with hollow multi‐channels than in solid constructs. The presence of hollow channels promotes the expression of Ki67 (a proliferation biomarker), mitigates the expression of hypoxia‐inducible factor 1‐alpha , and markedly enhances cell alignment (i.e., 82% of muscle myofibrils aligned (in ±10°) to the main direction of the microchannels after seven days of culture). The emergence of sarcomeric α ‐actin is verified through immunofluorescence and gene expression. Overall, this work presents an effective and practical tool for the fabrication of pre‐vascularized engineered tissues.