Programmable embedded bioprinting for one-step manufacturing of arterial models with customized contractile and metabolic functions.

Abstract

Replicating the contractile function of arterial tissues in vitro requires precise control of cell alignment within 3D structures, a challenge that existing bioprinting techniques struggle to meet. In this study, we introduce the voxel-based embedded construction for tailored orientational replication (VECTOR) method, a voxel-based approach that controls cellular orientation and collective behavior within bioprinted filaments. By fine-tuning voxel vector magnitude and using an omnidirectional printing trajectory, we achieve structural mimicry at both the macroscale and the cellular alignment level. This dual-scale approach enhances vascular smooth muscle cell (VSMC) function by regulating contractile and synthetic pathways. The VECTOR method facilitates the construction of 3D arterial structures that closely replicate natural coronary architectures, significantly improving contractility and metabolic function. Moreover, the resulting multilayered arterial models (AMs) exhibit precise responses to pharmacological stimuli, similar to native arteries. This work highlights the critical role of structural mimicry in tissue functionality and advances the replication of complex tissues in vitro.