Flexibly Deformable Collagen Hydrogel Tube Reproducing Immunological Tissue Deformation of Blood Vessels as a Pharmacokinetic Testing Model

Since the biochemical reaction of blood vessels plays an essential role in immune response or various diseases, in vitro vascular models have high demand from medical fields. However, vascular models often tend to be difficult to mimic the biomedical reaction faithfully because of the lack of implementation of the tissue deformation. Here, an inflammatory mediator‐induced deformation reaction of a blood vessel on a flexibly deformable collagen hydrogel tube device is reproduced. A self‐standing collagen tube enables the tissue to deform flexibly in biochemical reaction and achieves contraction both at tissue and cell level. The contraction of tissue relieves the stress between cells under reaction to maintain cellular junctions even tight junctions are broken. Also, the drug perfusion test with antihistamine chemical is easily performed due to the connector part and properly inhibits the inflammatory reaction. Moreover, the traction force on endothelial cells is analyzed as about 0.9 µN on two types of scaffolds with different stiffness. It is believed that the potential of the flexible tissue model to reproduce biochemical reactions can contribute to the fabrication of vascular tissue models mimicking in vivo in high similarity as a platform for biomedical researches and pharmacokinetic testing. An immunological deformation reaction of blood vessels is reproduced on a flexibly deformable collagen tube device both at tissue and cell levels. Histamine induces contraction of endothelial cells and shrinkage of the vessel tissue thanks to the self‐standing collagen tube. The traction force is calculated by numerical analysis and drug demonstration is performed with antihistamine.