Mesenchymal Stem Cell Conditioned Medium for Consistent Growth Factor Production
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Solution Overview
Problem
Current methods for culturing mesenchymal stem cells (MSCs) often result in variations in cell behavior and biological product production due to differences in isolation techniques and in vitro culture conditions, leading to challenges in maintaining ideal growth conditions and preventing senescence, with existing conditioned media not consistently containing optimal levels of VEGF and GRO/KC.
Innovation Solution
A conditioned medium is developed that contains at least 4000 pg/ml VEGF and 500 pg/ml GRO/KC, produced by seeding mesenchymal stem cells from bone marrow into a specific culture medium, where the cells exhibit specific characteristics such as high lactate production and controlled pH, and is characterized by the expression of CD29 and CD44 markers and absence of CD11b and CD45 markers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard culture methods are used to culture MSCs, then cell growth is maintained, but variations in cell behavior and biological product production occur due to differences in isolation techniques and in vitro culture conditions
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative thresholds for growth factors (VEGF ≥4000 pg/ml, GRO/KC ≥500 pg/ml) and cytokines in the conditioned medium. These parameter specifications transform the variable culture process into a controlled method that produces consistent biological products regardless of minor variations in isolation techniques or culture conditions.
2Quantity of substance
If existing conditioned media are used, then MSC culture is supported, but optimal levels of VEGF and GRO/KC are not consistently achieved
Solution Approach 1:
The patent implements feedback control by specifying minimum concentration thresholds for VEGF (4000 pg/ml) and GRO/KC (500 pg/ml) that must be achieved in the conditioned medium. This feedback mechanism ensures that only cultures producing sufficient levels of these critical growth factors are considered successful, thereby guaranteeing consistent and optimal biological product levels.
Solution Approach 2:
The invention changes the parameter specifications for growth factor concentrations by establishing minimum thresholds (VEGF ≥4000 pg/ml, GRO/KC ≥500 pg/ml) that distinguish the improved conditioned medium from existing media. This parameter transformation ensures consistent achievement of optimal biological product levels.
3Productivity
If MSCs are cultured for extended periods, then sufficient biological products are produced, but senescence and loss of culture occur
Solution Approach 1:
The patent applies preliminary action by using conditioned medium from young, healthy MSCs (passage 3-5) to culture subsequent MSCs. This preliminary preparation of optimal culture conditions from non-senescent cells prevents senescence in the cultured MSCs, allowing extended culture periods while maintaining high productivity and biological product production.
Data Source
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AI summary
Aspects of the invention relate to a novel mesenchymal stem cell line (hb-MSC), a culture medium conditioned by the hb-MSC line, and various hb-MSC compositions. The hb-MSC composition may include a plurality of hb-MSCs, an hb-MSC conditioned medium, or a combination thereof. The hb-MSC composition may also include an appropriate carrier. Also described are methods of use for the hb-MSC cells, the conditioned medium and compositions thereof.