3D Scaffold MSC Expansion with Decellularization
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Solution Overview
Problem
Conventional cell culture methods for expanding human mesenchymal stem cells (hMSCs) lead to a gradual loss of self-renewal and therapeutic potency, along with reduced responsiveness to stimuli and secretion of therapeutic factors, making it challenging to obtain sufficient quantities for clinical use while maintaining their multilineage potential and viability.
Innovation Solution
A method involving seeding freshly isolated MSCs on a planar surface or 3-D scaffold under physiological or low O2 tension to form a 3-D ECM network, followed by decellularization and reseeding to maintain an undifferentiated phenotype, using a perfusion bioreactor system with controlled O2 tension and flow, and growing them in media with low serum concentration or serum-free media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional sequential passaging culture methods are used to expand hMSCs, then billion-fold expansion is achieved, but self-renewal and stem cell properties are gradually lost
Solution Approach 1:
The patent changes the culture parameter from conventional sequential passaging to a single-passaged 3D culture system with controlled oxygen tension (1-5% O2), maintaining stem cell properties while achieving sufficient cell expansion for therapeutic use
Solution Approach 2:
The patent transitions from traditional 2D planar culture surfaces to 3D scaffold structures, enabling cells to form three-dimensional networks that better replicate in vivo conditions and maintain stemness during expansion
2Quantity of substance
If standard culture methods are used to obtain sufficient quantity for transplantation, then cell quantity is increased, but therapeutic potency and responsiveness to stimuli are reduced
Solution Approach 1:
The patent modifies culture parameters by implementing hypoxic conditions (1-5% O2 tension) and 3D scaffold architecture, which preserves therapeutic potency and responsiveness to stimuli while achieving the required cell quantities for transplantation
Solution Approach 2:
The patent creates an in vitro 3D culture system that copies key features of the in vivo bone marrow microenvironment, including extracellular matrix composition and oxygen tension, to maintain stem cell properties and therapeutic functionality
3Quantity of substance
If lengthy expansion is performed in standard culture, then sufficient cell quantity is obtained, but genetic and epigenetic changes occur
Solution Approach 1:
The patent performs preliminary characterization of cells at passage 0 before culture expansion, establishing baseline genetic and epigenetic profiles, then maintains stable conditions throughout a single passage in 3D hypoxic culture to prevent drift and maintain cellular identity
Solution Approach 2:
The patent uses controlled hypoxic parameters (1-5% O2) and 3D scaffold architecture to prevent genetic and epigenetic instability during cell expansion, achieving sufficient cell numbers without the harmful effects of prolonged conventional culture
4Quantity of substance
If conventional culture methods are used, then cell expansion is achieved, but cell size increases and cell mobility is reduced
Solution Approach 1:
The patent moves cells from 2D monolayer culture to 3D scaffold-based culture, allowing cells to maintain more natural sizes and mobilities by forming three-dimensional networks that replicate in vivo tissue architecture
Data Source
AI summary
The subject invention concerns materials and methods for growing and expanding MSC while maintaining their undifferentiated phenotype, self-renewal ability, and/or multi-lineage potential. In one embodiment, a method of the invention comprises i) seeding freshly isolated MSC on a planar surface or a 3-D scaffold and growing the cells under physiological or low O2 tension for a period of time sufficient to support formation of 3-D ECM network; ii) decellularizing the planar surface or 3-D scaffold; and iii) reseeding the decellularized planar surface or 3-D scaffold with MSCs, whereby the reseeded MSCs can be grown on the scaffold and maintain an undifferentiated phenotype. In one embodiment, the 3-D scaffold comprises or is composed of PET. In one embodiment, the MSC are human MSC (hMSC).