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Tracking Hypoxic Signaling within Encapsulated Cell Aggregates
Published on: December 16, 2011
Tracking hypoxic signaling in encapsulated stem cells
Suchit Sahai1, Rachel McFarland, Mathew L Skiles
1Biomedical Engineering Program, College of Engineering and Computing, University of South Carolina, Columbia, SC 29208, USA.
Tissue Engineering. Part C, Methods
|January 19, 2012
Summary
Researchers developed a novel hypoxia marker (HRE DsRed-DR) to track how cells perceive oxygen levels. This tool is effective for monitoring hypoxic signaling in encapsulated stem cells, aiding tissue engineering applications.
Area of Science:
- Biomedical Engineering
- Stem Cell Biology
- Molecular Biology
Background:
- Oxygen concentration is a critical regulator of stem cell fate and function.
- Hypoxic signaling plays a vital role in stem cell differentiation and tissue engineering.
- Developing tools to monitor cellular oxygen perception is essential for understanding stem cell behavior.
Purpose of the Study:
- To develop and validate a novel hypoxia-responsive marker (HRE DsRed-DR) for monitoring cellular oxygen sensing.
- To assess the marker's performance in adipose-derived stem cells (ADSCs) cultured in 2D and 3D environments under varying oxygen conditions.
- To evaluate the marker's utility for tracking hypoxic signaling in encapsulated stem cells for tissue engineering.
Main Methods:
- Genetically engineered ADSCs using a recombinant adenovirus carrying the HRE DsRed-DR hypoxia marker.
- Cultured ADSCs in 2D and encapsulated them in PEG-based hydrogels for 3D culture.
- Exposed cells to 20% and 1% oxygen environments for 96 hours, monitoring red fluorescence and validating with immunostaining and Western blot for hypoxia-inducible factor-1α.
Main Results:
- The HRE DsRed-DR marker successfully detected hypoxic signaling in ADSCs under low oxygen (1%) in both 2D and 3D cultures.
- In 2D, marker signal appeared at 24h and peaked at 96h (59% cells) in 1% O2; no signal in 20% O2.
- In 3D, signal appeared earlier (4h) and peaked at 96h (76% cells) in 1% O2, with detectable signal (13% cells) even in 20% O2. Western blots correlated well with marker expression.
Conclusions:
- The HRE DsRed-DR adenovirus marker is a reliable tool for tracking hypoxic signaling onset in encapsulated mesenchymal stem cells.
- The marker provides insights into cellular perception of oxygen, complementing direct oxygen measurements.
- This tool holds significant potential for advancing tissue engineering research by enabling better monitoring of stem cell responses in engineered constructs.
