SSC Separation from Frozen Testicular Tissue via Enzymatic Digestion
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Solution Overview
Problem
Current methods for separating spermatogonial stem cells (SSCs) from frozen testicular tissue are inefficient due to high cell damage caused by trypsin, which complicates the enrichment and purification process, especially when dealing with fragile frozen tissues.
Innovation Solution
A method involving resuscitation of frozen testicular tissue using a collagenase IV and DNase I digestion, followed by washing and centrifugation, and subsequent Percoll gradient centrifugation to enrich and purify SSCs, maintaining cell viability and reducing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trypsin is used in two-step enzyme digestion method, then SSCs can be separated from testicular tissue, but cell damage increases and cell viability decreases
Solution Approach 1:
The patent changes the enzymatic parameters by replacing trypsin with collagenase IV and DNase I, adjusting enzyme types and concentrations to achieve effective tissue digestion while minimizing cell damage to SSCs
Solution Approach 2:
The patent introduces seminiferous tubules as an intermediary structure that protects SSCs during the digestion process, allowing enzymes to digest surrounding tissue while the tubule structure maintains SSC integrity
2Reliability
If frozen testicular tissue is used, then tissue preservation is improved, but tissue fragility increases making separation difficult
Solution Approach 1:
The patent performs preliminary resuscitation of frozen tissue by thawing and activating metabolic processes before digestion, restoring tissue pliability and reducing fragility while preserving SSC viability
Solution Approach 2:
The patent changes the physical state parameters of frozen tissue through controlled thawing and temperature management, transitioning from frozen rigid state to physiological soft state suitable for enzymatic digestion
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
This method effectively stabilizes the cellular environment, allowing natural cell migration and enrichment, thereby improving SSC separation from frozen tissues with reduced cell damage and supporting the preservation of genetic information.
Implementation Method 1
digesting the resuscitated testicular tissue with a collagenase IV and a DNase I until seminiferous tubules are exposed
Implementation Method 2
conducting centrifugation
Implementation Method 3
enriching and purifying SSCs by Percoll gradient centrifugation
Data Source
AI summary
The present disclosure provides a method for separating SSCs from a frozen testicular tissue, and belongs to the field of cell biology. In the present disclosure, the method includes the following steps: resuscitating a frozen testicular tissue, digesting the resuscitated testicular tissue with a collagenase IV and a DNase I until seminiferous tubules are exposed and tube walls become coarse; washing the digested testicular tissue with a DPBS, conducting centrifugation and culture until cells migrate; collecting the migrated cells, and enriching and purifying SSCs. The method can maintain a milieu interieur of the SSCs to the greatest extent, and therefore cell viability, and less cell damages. Therefore, the method can be used for the separation of SSCs from frozen testicular tissues.