Stem Cell Bank Kit Laminin-521 Substrate Embryo Extraction
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Solution Overview
Problem
Current stem cell banks lack efficient methods for maintaining pluripotency and self-renewal of human embryonic stem cells over long periods without contamination and differentiation, and there is a need for a system that can form stem cell banks from embryos fertilized in vitro or in vivo without harming the embryo.
Innovation Solution
A kit comprising a cell culture substrate with laminin-521 or laminin-511 and e-cadherin, a cell culture medium, a cell splitting solution, and a freezing medium, along with a HLA serotype analyzer, which allows for the expansion and storage of stem cells from a single blastomere without feeder cells or differentiation inhibitors, enabling the creation of a stem cell bank that maintains pluripotency and self-renewal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional stem cell culture methods are used, then stem cells can be maintained for some period, but they lose pluripotency and self-renewal capacity over time and require feeder cells or differentiation inhibitors
Solution Approach 1:
The invention changes the biochemical parameters of the culture substrate by using specific laminin isoforms (laminin-511 or laminin-521) at defined concentrations (e.g., 10-100 µg/mL), replacing undefined feeder cell conditions with defined recombinant protein conditions, thereby maintaining stem cell pluripotency and self-renewal for extended periods without feeder cells or differentiation inhibitors
Solution Approach 2:
The invention replaces expensive and complex feeder cell systems with a simpler, more stable recombinant laminin coating that can be prepared once and used repeatedly, eliminating the need for continuous feeder cell maintenance and reducing variability in stem cell culture conditions
2Quantity of substance
If stem cells are cultured long-term, then more cells are available for banking, but contamination and differentiation increase
Solution Approach 1:
The invention creates a controlled, defined culture environment using recombinant laminin-511 or laminin-521 that is free from xenogeneic contaminants and undefined components, providing a stable and inert biochemical environment that prevents both biological contamination and unwanted differentiation while supporting long-term stem cell proliferation
Solution Approach 2:
The invention extracts and isolates the specific biochemical signals (laminin-511 or laminin-521) that are necessary for stem cell maintenance, removing the need for complex feeder cell systems and differentiation inhibitors, thereby simplifying the culture system and reducing sources of contamination and variability
3Reliability
If embryos are used to obtain stem cells, then pluripotent stem cells are obtained, but the embryo is destroyed in conventional methods
Solution Approach 1:
The invention extracts a single blastomere from an early-stage embryo, allowing the remaining embryo to continue normal development, thereby obtaining pluripotent stem cells without destroying the embryo. The extracted blastomere is then cultured on laminin-511 or laminin-521 to maintain its pluripotent state
Solution Approach 2:
The invention performs preliminary culture and expansion of the single blastomere on defined laminin substrates before any potential transplantation or differentiation, ensuring the stem cells are properly established and characterized while the donor embryo continues to develop normally
Data Source
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AI summary
The present disclosure is related to methods for forming a stem cell bank. The methods include obtaining a first stem cell from a multi-cell fertilized embryo, expanding the first stem cell into two or more descendant stem cells, and storing at least one of the descendant stem cells to form the stem cell bank. Also disclosed is a kit that can be used for making the stem cell bank during in vitro fertilization. If desired, the HLA serotype of the stem cells can be determined prior to storage.