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Biohybrid robots composed of biological and synthetic components have been introduced to reconstruct biological functions in mechanical systems and obtain better understanding of biological designs. For example, biohybrid robots powered by skeletal muscle tissue have already succeeded in performing various movements. However, it has been difficult for the conventional biohybrid robots to actuate in air, as the skeletal muscle tissue often dries out in air and is damaged. To overcome this limitation, we propose a biohybrid robot in which the skeletal muscle tissue is encapsulated in a collagen structure to maintain the required humidity conditions when operated in air. As the skeletal muscle tissue maintains high cell viability and contractility, even after encapsulation within the collagen structure, the biohybrid robot can move in air through contractions of the skeletal muscle tissue. To demonstrate the applicability of the developed biohybrid robot, we demonstrate its use in object manipulation. In addition, to prove its capability of functionality enhancement, we show that the biohybrid robot can actuate for a long term when perfusable tubes are set inside the collagen structure; it can actuate even while culturing cells on its surface. The developed biohybrid robot composed of skeletal muscle tissue and collagen structure can be employed within platforms used to replicate various motions of land animals.
We describe a microfiber-shaped hepatic tissue for in vitro macroscopic tissue assembly, fabricated using a double coaxial microfluidic device and composed of cocultured Hep-G2 cells and human umbilical vein endothelial cells (HUVECs). The appropriate coculture conditions for Hep-G2 cells and HUVECs in the microfiber-shaped tissue were optimized by changing the thickness of the core and the cell ratio. The HUVEC networks were formed in the microfiber-shaped tissue following culture for 3 days. Using this microfiber-shaped tissue as a building block, two types of macroscopic assembled tissues were constructed-parallel and reeled tissues. In both tissue types, the connection of the HUVEC network across the adjacent microfiber-shaped tissues was established after 2 days, because the calcium alginate shell of the microfiber-shaped tissue was enzymatically removed. Our approach could facilitate the generation of complex and heterogeneous macroscopic tissues mimicking the major organs including the liver, kidney, and heart for the treatment of critically ill patients.
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