Advances and Challenges in 3D Bioprinting for Organ Transplantation: Bridging the Gap Between Research and Clinical Applications.

The global shortage of organs continues to remain a significant challenge in modern medicine, with the demand for organs greatly exceeding the available supply. In this context, 3D bioprinting has emerged as a transformative technology within regenerative medicine, offering the potential to create patient-specific functional organs for transplantation. This review explores the significant advances in 3D bioprinting, highlighting the development of complex techniques like extrusion-based and volumetric bioprinting, innovations in bioink formulation utilizing decellularized extracellular matrix (dECM) and stem cells, and novel strategies for constructing functional vascular networks within engineered tissues. However, the clinical application of bio-printed organs encounters significant obstacles, including technical limitations in scaling up production, biological challenges such as immune rejection and functional maturation, and the absence of standardized regulatory frameworks. To address this gap, we propose multidisciplinary approaches, including the integration of artificial intelligence (AI) for organ design, strategic collaborations between industry and academia, and the development of clear regulatory frameworks. By addressing these challenges through collaborative global efforts, 3D bioprinting has the potential to revolutionize organ transplantation and eventually eliminate organ waitlists.