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Rational bioprocess design for human pluripotent stem cell expansion and endoderm differentiation based on cellular

Mark D Ungrin¹, Geoff Clarke, Ting Yin

¹Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario, Canada.

Biotechnology and Bioengineering

|December 6, 2011

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This study introduces a predictive bioprocess design strategy for human pluripotent stem cells (hPSCs), optimizing expansion and differentiation for definitive endoderm (DE) progenitor production. The approach overcomes bottlenecks for scalable, high-purity cell generation.

Area of Science:

Stem Cell Biology
Bioprocess Engineering
Developmental Biology

Background:

Human pluripotent stem cells (hPSCs) hold therapeutic potential but face challenges in scalable expansion and directed differentiation.
Existing bioprocesses often encounter bottlenecks limiting yield and purity of desired cell types, such as definitive endoderm (DE) progenitors.
Cell- and molecular-level analysis is crucial for understanding and optimizing complex stem cell bioprocesses.

Discussion:

A predictive bioprocess design strategy was developed, focusing on cell- and molecular-level analysis of rate-limiting steps.
Quantitative cell division tracking and fate monitoring were employed to identify and address bottlenecks in suspension culture.
Process operating conditions were adapted to cell-line-specific parameters like single-cell survival and growth rate.

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Key Insights:

Adherent-equivalent expansion of hPSCs was achieved in feeder- and matrix-free defined-medium suspension culture.
A bioprocess optimization parameter (L; targeted cell Loss) was defined and utilized to manage process efficiency.
High-purity DE progenitors were generated through a scalable directed-differentiation process with an 18-fold expansion, demonstrating predominantly instructive differentiation mechanisms.

Outlook:

The findings enable prospective specification of iPSC expansion and differentiation conditions for enhanced production of target cells.
This scale-free directed differentiation system provides a robust platform for generating DE progenitors for pancreatic and hepatic lineage commitment.
The predictive strategy offers a foundation for optimizing other stem cell-based bioprocesses for regenerative medicine applications.