Serum-Free Expansion of Adherent Stromal Cells
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Solution Overview
Problem
The increasing demand and ethical concerns surrounding the use of fetal bovine serum (FBS) in cell culture have led to a need for serum-free alternatives, as existing alternatives have not been widely adopted and are not chemically defined, requiring empirical testing for each application.
Innovation Solution
Adherent stromal cells (ASC), such as placental ASC, are expanded in a serum-free medium, exhibiting unique characteristics and therapeutic potential, and can be cultured on 2D or 3D substrates, allowing for systemic or distant tissue use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fetal bovine serum (FBS) is used in cell culture, then cell growth and expansion are supported, but ethical concerns arise and costs increase significantly
Solution Approach 1:
The patent extracts and eliminates FBS from the cell culture medium, replacing it with a chemically defined serum-free formulation. This removal of the problematic substance (FBS) directly addresses the ethical concerns and cost issues while maintaining cell culture functionality through alternative components.
Solution Approach 2:
The patent changes the chemical composition parameters of the cell culture medium by transitioning from a serum-based formulation to a chemically defined serum-free medium. This parameter change involves specifying exact concentrations of growth factors, amino acids, and other components rather than relying on variable serum composition, thereby eliminating ethical and cost problems while supporting cell growth.
2Object-affected harmful factors
If chemically defined serum-free alternatives are adopted, then ethical and cost issues are resolved, but they require empirical testing in each cell culture application
Solution Approach 1:
The patent develops a universal chemically defined medium formulation that can be applied across multiple cell culture applications without requiring extensive re-testing for each specific use. The medium is designed to support diverse adherent cell types through inclusion of broad-spectrum growth factors and nutrients, reducing the need for application-specific empirical optimization.
3Reliability
If ASC are expanded in serum-free medium, then unique therapeutic characteristics are produced, but the process requires optimized culture conditions
Solution Approach 1:
The patent performs preliminary optimization of culture conditions including substrate selection (2D or 3D), passage timing, and medium composition before implementing the expansion protocol. By establishing optimized conditions in advance, the protocol ensures consistent production of therapeutic factors without requiring complex real-time adjustments during cell expansion.
Data Source
AI summary
Disclosed herein are methods of expanding adherent stromal cells, including, inter alia, multi-step methods. Also disclosed are cells produced by the methods, which may be adherent stromal cells, for example placental adherent stromal cells. Further disclosed are pharmaceutical compositions comprising the cells. Additionally, methods of producing and utilizing the compositions, for example for therapeutic uses, are described.