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UV laser-processed microstructure for building biohybrid actuators with anisotropic movement.
Biofabrication 2024 Februrary 10
Fabrication of a biohybrid actuator requires muscle cells anisotropically aligned in a line, curve, or combination of lines and curves (similar to the microstructure of living muscle tissue) to replicate lifelike movements, in addition to considering the arrangement of skeletal structure or muscular structure with anisotropic straight patterns. Here, we report a UV laser-processed microstructure for freely directing cellular alignment to engineer a biohybrid actuator composed of poly(styrene- block -butadiene- block -styrene triblock copolymer) (SBS) thin film with tailor-made microgrooves (MGs) and skeletal myotubes aligned along these MGs. Specifically, straight, circular, or curved MGs were transferred to SBS thin films from a UV laser-processed template, allowing for the successful alignment of myotubes along MGs. The biohybrid actuator, composed of anisotropically aligned myotubes on a curved microgrooved SBS thin film, was contracted by electrical stimulation. Contraction of biohybrid actuators with curved aligned myotubes permits twisted-like behavior, unlike straight microgrooved films. Therefore, the UV laser-ablation system is a unique maskless and rapid microfabrication technique that provides intriguing opportunities for omni-directional microgrooved structures to achieve the complex motion of living organisms.
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