Bio Roll-Up is a hydrogel technology that creates flat cell sheets which can be triggered to roll into 3D shapes, using layered polymers and additives like gelatin for improved cell attachment, enabling precise, biomimetic tissue engineering applications.
Background: Tissue engineering and regenerative medicine are rapidly advancing fields that seek to create functional biological tissues for transplantation, disease modeling, and drug testing. Central to these efforts is the ability to fabricate three-dimensional (3D) structures that accurately mimic the architecture and microenvironment of native tissues. Traditional two-dimensional (2D) cell cultures fail to replicate the complex cell-cell and cell-matrix interactions found in vivo, limiting their utility for both research and therapeutic applications. As a result, there is a growing demand for technologies that can transform flat cell sheets into 3D constructs with precise control over geometry, mechanical properties, and cellular compatibility. Hydrogels, with their high water content and tunable properties, have emerged as promising materials for building such tissue-like scaffolds, but reliable methods to assemble them into complex 3D shapes while maintaining cell viability and function remain a significant challenge. Current approaches to creating 3D hydrogel structures often suffer from several limitations. Many fabrication techniques rely on manual manipulation, which can introduce variability and damage delicate cell layers. Others use chemical or physical triggers for self-assembly that lack precise control, leading to premature or incomplete formation of the desired structures. Additionally, ensuring robust adhesion of hydrogel layers during processing is problematic, frequently resulting in detachment or defects that compromise structural integrity. Achieving uniform cell attachment is another persistent issue, as many hydrogels lack the necessary biochemical cues for effective cell adhesion, leading to poor cell viability and function. These challenges highlight the need for improved fabrication methods that offer reliable control over self-assembly, strong layer adhesion, and enhanced cellular compatibility to realize the full potential of engineered 3D tissues.
Technology Overview: The described technology is a sophisticated platform for fabricating self-assembling, multi-layered hydrogel structures—referred to as Bio Roll-Up—that transform planar cell sheets into three-dimensional (3D) shapes, such as tubes, for tissue engineering applications. The fabrication process involves sequential spin-coating of an adhesion layer, a thermally responsive copolymer layer, and two distinct biolayers onto a silicon wafer. By carefully modulating the acrylic acid (AA) content between the two biolayers the system achieves precise control over differential swelling, enabling the hydrogel structures to remain flat at physiological temperature and rapidly roll up into 3D forms when cooled. To enhance cellular compatibility, gelatin is incorporated into one of the biolayers, resulting in uniform films with improved cell attachment. The process is further optimized through photolithography for precise patterning. What differentiates this technology is its comprehensive integration of material science, microfabrication, and bioengineering to achieve tunable, on-demand 3D hydrogel assembly with high cell compatibility. The ability to precisely control self-assembly timing through both chemical composition and process engineering sets it apart from conventional hydrogel systems, which often lack such temporal and structural control. The innovative approach to incorporating gelatin—by converting it into a finely ground powder for uniform dispersion—addresses a common challenge in hydrogel biofabrication: achieving both structural integrity and optimal cell attachment. Additionally, the platform’s adaptability is underscored by plans to integrate custom peptide polymers, allowing further tuning of swelling, cell adhesion, and pore size to meet specific biomedical needs. This versatility and level of control make the technology particularly valuable for advanced tissue engineering, regenerative medicine, and the creation of biomimetic environments for cell culture and differentiation studies.
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Advantages: • Precise control of self-assembly timing through modulation of acrylic acid concentration in biolayers • Improved adhesion and fabrication reliability using an adhesion layer • Ability to maintain flat hydrogel structures at physiological temperature and trigger rapid rolling at lower temperature • Enhanced cellular attachment and film uniformity by incorporating gelatin into biolayers • Scalable and reproducible fabrication process using photolithography and spin-coating techniques • Potential for further customization of hydrogel properties via integration of custom peptide polymers • Enables creation of 3D biomimetic hydrogel structures suitable for tissue engineering and regenerative medicine applications
Applications: • 3D tissue engineering scaffolds • Regenerative medicine cell delivery • Organ-on-chip model fabrication • Customizable biomedical implants • Controlled drug release systems
Intellectual Property Summary: Patent pending
Stage of Development: TRL 4
Licensing Status: This technology is available for licensing.