Umbilical Cord Amniotic Membrane Stem Cell Isolation for High Homogeneity
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Solution Overview
Problem
Current methods for isolating mesenchymal stem cells from the amniotic membrane of the umbilical cord do not produce a highly homogenous population, which is necessary for clinical trials and cell-based therapies.
Innovation Solution
A method involving the cultivation of umbilical cord tissue in a specific culture medium comprising DMEM, F12, M171, and FBS, which results in a mesenchymal stem cell population with at least 90% expression of CD73, CD90, and CD105 markers and lack of CD34, CD45, and HLA-DR markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional isolation methods are used, then the process is simple and quick, but the cell population homogeneity is low
Solution Approach 1:
The isolation method is divided into multiple sequential steps: initial cultivation in DMEM/F12 with FBS, followed by subcultivation in M171 medium, and final selection in DMEM with specific growth factors. This segmentation allows progressive enrichment of homogeneous mesenchymal stem cells while managing complexity through staged processing
Solution Approach 2:
The method performs preliminary cultivation in DMEM/F12 medium supplemented with FBS before the actual isolation step. This preliminary action pre-enriches the cell population and activates stem cell markers, making the subsequent isolation more efficient and achieving higher homogeneity with reduced overall complexity
2Manufacturing precision
If conventional culture media are used, then the culture process is simple, but the stem cell marker expression is insufficient
Solution Approach 1:
The culture medium composition is systematically changed across different cultivation stages: DMEM/F12 with 10% FBS for initial growth, then M171 medium for expansion, and finally DMEM with bFGF and EGF for differentiation. These parameter changes in medium composition progressively enhance stem cell marker expression while maintaining manageable protocol complexity
Solution Approach 2:
The invention uses composite culture media combining multiple components: DMEM base medium, F12 supplement, 10% FBS, bFGF, and EGF. This composite medium formulation synergistically promotes high-level expression of CD73, CD90, and CD105 markers while supporting comprehensive stem cell functionality
3Manufacturing precision
If rapid isolation is performed, then the processing time is short, but the cell population purity is low
Solution Approach 1:
The isolation protocol maintains continuous useful action through sequential subcultivation steps without intermediate interruptions. Cells are continuously exposed to optimized culture conditions across multiple passages, progressively enriching purity while minimizing idle time. The continuous culture approach achieves high purity (≥90% homogeneous population) within a compressed timeframe compared to batch processing methods
Data Source
AI summary
The present invention relates to a method of cryopreserving a mesenchymal stem cell population, the method comprising: cultivating umbilical cord tissue in a culture medium comprising DMEM (Dulbecco's modified eagle medium), F12 (Ham's F12 Medium), M171 (Medium 171) and FBS (Fetal Bovine Serum) to provide outgrowth of mesenchymal stem cells present in the amniotic membrane of the umbilical cord; isolating the mesenchymal stem cell population by collecting the outgrown mesenchymal stem cells; and placing the isolated mesenchymal stem cell population in cryopreserved storage. The invention also relates to a cryopreserved mesenchymal stem population of the amniotic membrane of the umbilical cord.