Decellularized Tissue Collagen Conditioning for ECM Integrity
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Solution Overview
Problem
Tissue engineering methods face challenges in maintaining collagen structure and extracellular matrix integrity during decellularization, leading to destabilization and reduced effectiveness in promoting cell growth and tissue regeneration.
Innovation Solution
A two-step or three-step pretreatment regimen involving collagen conditioning with saline and sugar alcohols, followed by structural strengthening with cross-linking agents, and biological preparation with protein solutions to restore collagen alignment, moisture, and ECM proteins, enhancing the tissue environment for cell growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decellularization treatments (enzyme, detergent, solvent) are applied to remove cell debris, then the tissue is prepared for reseeding with fresh cells, but collagen structure is damaged and ECM proteins are lost
Solution Approach 1:
The patent changes the chemical parameters of the treatment solution by using physiological salt solutions (PBS, saline) instead of harsh enzymes and detergents. This parameter change maintains tissue structure while achieving decellularization through osmotic pressure and ionic interactions, preserving collagen alignment and ECM proteins.
Solution Approach 2:
The patent introduces physiological salt solutions as intermediary substances that mediate between the need for decellularization and the need to preserve tissue structure. These intermediaries gently remove cellular material without directly attacking collagen or ECM proteins, unlike enzymes and detergents.
2Reliability
If harsh decellularization methods are used to remove all cell debris, then the tissue scaffold is prepared for new cell growth, but moisture loss occurs and protective envelope is depleted
Solution Approach 1:
The patent changes the physical and chemical parameters of the treatment environment by using isotonic physiological solutions that match tissue osmolarity. This prevents osmotic water loss and maintains the protective envelope of proteoglycans and glycosaminoglycans while achieving adequate decellularization.
Solution Approach 2:
The patent converts the potential harm of insufficient decellularization into a benefit by using mild solutions that achieve adequate cell removal while preserving moisture and ECM molecules. The gentle treatment conditions become advantageous by maintaining tissue hydration and protective envelopes.
3Reliability
If traditional decellularization processes are applied, then cell debris is removed, but collagen alignment and tertiary structure are lost
Solution Approach 1:
The patent changes the chemical aggressiveness parameter by replacing proteolytic enzymes and harsh detergents with physiological salt solutions. This parameter change allows decellularization through ionic interactions and osmotic effects while preserving the physical integrity, alignment, and tertiary structure of collagen fibers.
Solution Approach 2:
The patent substitutes mechanical and chemical force-based decellularization (enzymatic digestion, detergent disruption) with osmotic and ionic mechanisms. The physiological salt solutions achieve cell removal through osmotic pressure and ionic interactions rather than mechanical breakdown, preserving collagen structure.
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 results in more successful tissue engineering constructs with reduced calcium deposits and improved cell growth, providing a stable framework for synthetic tissue development.
Implementation Method 1
The initial solution (Solution 5) is designed to wash out any residual storage solution and then to 'condition' the collagen so as to protect and restore fiber alignment and moisture
Implementation Method 2
The next solution used in the collagen conditioning step ('Solution 2') has the effect of conditioning collagen present in the tissue by strengthening the collagen bonds and helping the collagen reform its natural Madras helix
Implementation Method 3
The heparin and hyaluronan restore molecular polarity of the collagen triple helix and reestablishes a moisture envelope around the collagen and elastin fibers
Implementation Method 4
The addition of citric acid, which acts as an anti-calcification agent aids in this advantageous property of the present invention
Data Source
AI summary
The present invention provides for solutions and methods of preparing a decellularized tissue for recellularization. The solutions provide collagen conditioning to restore collagen triple helix structure, strengthening of the collagen structure of the tissue, and biologically preparing the decellularized tissue by placing it in an environment that promotes recellularization. Methods and solutions for recellularization of a decellularized tissue, in accordance with the present invention, are also provided.