Stem Cell Expansion Medium Using Carnitine and Heparin
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Solution Overview
Problem
Stem cells are present in minute quantities and are difficult to maintain in culture, especially in hard-to-reach organs, and there are ethical concerns with embryonic stem cells, necessitating methods for multiplying stem cells without differentiating into less potent forms.
Innovation Solution
A medium and method for culturing, expanding, and differentiating stem cells using a combination of human serum, O-acetyl-L-carnitine, N-desulphated-N-acetylated heparin, and specific cytokines such as thrombopoietin, flt-3 ligand, and stem cell factor, which supports the proliferation and differentiation of stem cells into primitive lineage-specific progenitor cells like natural killer and vascular progenitor cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If stem cells are cultured and multiplied, then the quantity of stem cells increases, but the cells may differentiate into less potent forms
Solution Approach 1:
The patent changes chemical parameters of the culture medium by adding specific compounds (O-acetyl-L-carnitine at 2-10 mmol/l, N-desulphated-N-acetylated heparin at 40-80 mg/l) and cytokine combinations to control stem cell differentiation and maintain potency during expansion
Solution Approach 2:
The patent uses specific intermediary substances in the culture medium that mediate between the stem cells and the culture environment, preventing unwanted differentiation while allowing controlled proliferation and self-renewal
2Productivity
If stem cells are maintained in culture, then the cells can be expanded, but the culture maintenance is difficult
Solution Approach 1:
The patent optimizes culture medium parameters including serum concentration (1-20%), specific cytokine combinations, and chemical additives to create ideal conditions for stem cell proliferation and maintenance
Solution Approach 2:
The patent uses composite culture media combining multiple components (basic medium, serum, O-acetyl-L-carnitine, N-desulphated-N-acetylated heparin, cytokines) to achieve synergistic effects that simplify culture maintenance while enhancing productivity
3Quantity of substance
If embryonic stem cells are obtained, then stem cell production is achieved, but ethical concerns arise
Solution Approach 1:
The patent extracts and expands stem cells from easily obtainable sources like umbilical cord blood and placenta, separating the stem cell acquisition process from embryonic destruction, thereby eliminating ethical concerns while maintaining stem cell production capability
Solution Approach 2:
The patent utilizes readily available, non-controversial biological materials (umbilical cord blood, placental tissue) that are easily obtainable and do not raise ethical issues, replacing the need for embryonic stem cell harvesting
Data Source
AI summary
The invention provides means and methods for stem cell proliferation and subsequent generation and expansion of progenitor cells. The invention in particular provides media and other culture conditions for the same. The cells are preferably used as effector cells as clinical therapeutics.