Decellularized Matrix Preparation for Low-Immunogenic Tissue Scaffolds
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Solution Overview
Problem
Existing decellularization methods for animal-derived biomaterials face challenges in effectively removing immunogenic ingredients while minimizing damage to the extracellular matrix (ECM) structure and retaining bioactive ingredients, leading to potential immune reactions and reduced tissue regeneration capabilities.
Innovation Solution
A method involving pretreatment, degreasing, disinfection, decellularization with alkaline protease, removal of α-Gal antigen, and sterilization is employed, using specific reagents and conditions to preserve the ECM's structural integrity and bioactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong decellularizing reagents (detergents, NaOH, trypsin) are used to remove immunogenic ingredients, then decellularization effect is improved, but the three-dimensional structure of ECM is damaged and bioactive ingredients are lost
Solution Approach 1:
The patent changes the parameters of the decellularization process by using mild detergents (Triton X-100, CHAPS) at controlled concentrations (0.01-0.1%) and temperatures (4-37°C), replacing strong reagents like NaOH and trypsin. This parameter optimization achieves effective decellularization while preserving ECM structure and bioactive ingredients such as collagen, glycosaminoglycan, and laminin.
Solution Approach 2:
The patent introduces an intermediary washing step using PBS buffer between the decellularization treatment and subsequent processing steps. This intermediary step removes residual detergent while preserving the intact ECM structure, acting as a protective mediator that prevents further damage to the matrix.
2Reliability
If repeated freeze-thaw method is used for decellularization, then physical decellularization is achieved, but treatment period becomes excessively long
Solution Approach 1:
The patent replaces the mechanical freeze-thaw method with a chemical decellularization approach using mild detergents (Triton X-100, CHAPS). This substitution eliminates the need for repeated freezing and thawing cycles, significantly reducing the treatment time while maintaining effective decellularization through chemical action on cell membranes.
3Reliability
If animal-derived biomaterials are used to provide biological induction function, then tissue regeneration ability is improved, but immunogenic ingredients (residual DNA, fat) cause immune reactions
Solution Approach 1:
The patent extracts and removes immunogenic ingredients from the animal-derived biomaterial through a optimized decellularization process. Mild detergents selectively remove cell membranes, residual DNA, and fat while preserving the ECM structure. The subsequent washing steps further eliminate traces of immunogenic components, reducing immune reaction risks while maintaining the biological induction function for tissue regeneration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively removes immunogenic ingredients, retains bioactive components like collagen, glycosaminoglycan, and laminin, resulting in a decellularized matrix biomaterial with low immunogenicity and high bioactivity, suitable for tissue repair and regeneration.
Implementation Method 1
enzymatic methods: include protease digestion, nuclease digestion, and the use of calcium chelate reagents, and the like. Trypsin is the most commonly used enzyme in the decellularizing process.
Implementation Method 2
physical methods: repeated freeze-thaw method, for example, is a physical method of decellularizing
Implementation Method 3
chemical methods: mainly include using acids, bases, detergents (also known as surfactants). Detergents such as SDS, Triton X-100, and CHAPS, are chemically synthesized or semi-synthesized, with strong stain removal effect and good decellularizing effect.
Implementation Method 4
enzymatic methods: include protease digestion, nuclease digestion, and the use of calcium chelate reagents
Data Source
Figure 1A~2
Figure 3A~3C
Figure 3D~4
AI summary
The present application provides a preparation method for a decellularized matrix biomaterial, which combines specific pretreatment, degreasing, disinfection, decellularization, α-Gal antigen removal and sterilization, and reserves the integrity of bioactive components and structures in a material to the maximum extent while effectively removing an antigenic substance of an animal tissue, so that a decellularized matrix biomaterial having low immunogenicity and high biological activity is obtained. In addition, the decellularized matrix biomaterial prepared by the method provided by the present application effectively reduces immunogen components, has good biocompatibility and biological safety, is beneficial to cell adhesion, aggregation and proliferation on the surface, and can be used as a high-activity biological matrix material to be applied to skin soft tissue defect, gingival recession and periodontal soft tissue repair.