Avian Embryonic Stem Cell Isolation Using Defined Culture Medium
Solution Overview
Problem
Existing methods for isolating embryonic stem cells (ESCs) from avian embryos lack reproducibility due to reliance on animal-originating compounds and media with uncontrollable variations.
Innovation Solution
A reproducible process for isolating avian ESCs using specific combinations of growth factors that modulate key signaling pathways, combined with animal serum-free culture conditions, and the use of inhibitors to block MEK- and Wnt-signalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If animal-originating compounds and media are used for isolating ESCs, then cell isolation can be performed, but reproducibility is poor due to uncontrollable variations in composition
Solution Approach 1:
The invention extracts and removes animal-originating compounds from the culture medium, replacing them with chemically defined alternatives. This extraction of problematic components eliminates the source of compositional variations while maintaining the essential culture functions, thereby achieving both reproducibility and composition stability.
Solution Approach 2:
The invention changes the chemical parameters of the culture medium by transitioning from undefined animal-based compositions to precisely defined chemical compositions. This parameter change includes specifying exact concentrations of growth factors, hormones, and other components, which enables reproducible results while ensuring composition stability through controlled formulation.
2Productivity
If animal serum is used in culture medium, then cell growth is supported, but animal exploitation and slaughter are required which conflicts with animal welfare concerns
Solution Approach 1:
The invention replaces precious, ethically problematic animal serum with synthetic, chemically defined alternatives that can be produced without animal exploitation. These synthetic media components are designed to provide necessary growth factors and nutrients through chemical synthesis rather than animal derivation, eliminating the harmful connection to animal slaughter while maintaining cell growth support.
Solution Approach 2:
The invention introduces chemically defined growth factors and supplements as intermediaries that mediate between the need for cell growth support and the desire to avoid animal exploitation. These intermediary substances perform the essential function of animal serum (supporting cell growth) without the ethical drawbacks, acting as a bridge that satisfies both requirements.
3Reliability
If complex growth factor mixes are used to maintain pluripotency, then ESC pluripotency is maintained, but process complexity increases
Solution Approach 1:
The invention segments the complex mixture of growth factors into distinct, individually defined components with specific functions. By identifying and isolating the essential growth factors and signaling pathway modulators needed for pluripotency maintenance, the invention creates a simplified yet effective culture system that maintains reliability while reducing complexity through systematic decomposition of the original complex mixture.
Data Source
Figure 1
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Figure 3A~3B
AI summary
The invention relates to a process for isolating embryonic stem cells (100) from at least one avian embryonic cells comprising: isolating at least one embryo (101) at a developmental stage around oviposition; suspending embryonic cells (102) obtained by dissociating embryo(s) of step a) in an animal serum free basal culture medium supplemented with a combination of growth factors, at least one inhibitor and a substitute to animal serum; seeding the suspension of embryonic cells (103) on a layer of feeder cells ; culturing (104) the embryonic cells for at least one passage.