Stem Cell Differentiation Influenced By Oxygen Concentration And Pressure.pdf

Stem cells have vast potential for use in regenerative medicine due to their ability to differentiate into multiple cell lineages. However, realizing this potential requires techniques to culture cells under conditions that allow for robust production and consistent function while avoiding unwanted genetic and epigenetic changes. Maintaining stemness and committing stem cells to specific lineages for effective generation of a target cell remain significant challenges when scaling production and culture sizes for therapeutic applications.

While extensive research has focused on soluble factors to optimize stem cell culture, conditions such as hypoxia, atmospheric pressure, and the composition and organization of the extracellular matrix are also important drivers of stem cell differentiation and cell function. Xcell Biosciences has developed a novel stem cell culturing platform, the Avatar System, which allows for tunable control of the microenvironment and uniquely offers customizable settings for oxygen and hydrostatic pressure.

Scientists analyzed human pluripotent stem cells to characterize their underlying biology and to demonstrate the utility of the Avatar system. Cells iPSCs were cultured in minimally supportive media to allow stem cell state to differentiate into ectoderm, mesoderm, and endoderm cells. The Avatar system was used to tune environmental conditions and determine the impact of oxygen tension and pressure levels in guiding stem cell fate.

Results showed that significantly greater efficiency at commitment to ectoderm and mesoderm in iPSCs derived and cultured in normal physiological oxygen (5%) relative to standard incubator conditions. Moderate pressure (2 PSI) and reduced oxygen had the most abundant effect, suggesting atmospheric pressure plays a critical role in regulating stem cell differentiation.

These results are consistent with previous work implicating hypoxia signaling as an important regulator of pluripotency. They also provide strong evidence that environmental control could serve as a useful complement to current technologies for enhanced efficiency in stem cell growth, manipulation, and differentiation.

To learn more, scientists used control of the cellular microenvironment to study the impact of oxygen and pressure on differentiation towards neuronal cells. Established iPSC cultures were exposed to different microenvironmental conditions and cultured in a neural induction media and then assessed for neural progenitor marker expression.

Results provided exciting insight into new methods for enhancing neuron generation and expansion through microenvironmental control via the Avatar. This approach might be key to therapeutic applications for iPSC-derived neurons in regenerative medicine.

This project demonstrates the utility of the Avatar system for stem cell biology and indicates the potential for other regenerative medicine applications. With carefully cultured stem cells, it may ultimately be possible to generate highly functional, patient-specific adult cells for organ and tissue replacement.