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Overview
This protocol outlines the procedure for cryopreserving human induced pluripotent stem (iPS) cells using KnockOut SR cryopreservation medium and recovering them in either complete KnockOut SR Feeder Free (KSR-FF) medium or feeder-based KnockOut SR medium. The method emphasizes the importance of visual demonstration due to the sensitivity of iPS cells during freezing and thawing.
Key Study Components
Area of Science
- Cell Biology
- Stem Cell Research
- Cryopreservation Techniques
Background
- Human iPS cells are sensitive to freezing and thawing processes.
- KnockOut SR products facilitate various stages of stem cell culture.
- Proper cryopreservation is crucial for maintaining cell viability.
- Feeder-free and feeder-based culture conditions can be utilized for iPS cells.
Purpose of Study
- To provide a reliable protocol for cryopreserving iPS cells.
- To ensure successful recovery of cells post-thaw.
- To demonstrate the use of KSR products throughout the workflow.
Methods Used
- Preparation of iPS cells for cryopreservation.
- Use of serum-free freezing medium for cell preservation.
- Cryopreservation at -80 degrees Celsius followed by storage in liquid nitrogen.
- Thawing and resuspending cells in complete feeder-free medium.
Main Results
- Successful freezing and thawing of iPS cells demonstrated by healthy morphology.
- Cells maintained viability and growth in both feeder-free and feeder-based conditions.
- Protocol effectiveness confirmed through visual assessment of cell recovery.
- Maintaining uniform cell colony size improved recovery rates.
Conclusions
- The protocol provides a systematic approach to cryopreserving iPS cells.
- KnockOut SR products are effective for maintaining cell health during the process.
- Visual demonstrations enhance understanding and execution of the protocol.
What is the purpose of cryopreserving iPS cells?
Cryopreservation allows for the long-term storage of iPS cells while maintaining their viability for future experiments.
Why is visual demonstration important in this protocol?
iPS cells are sensitive to freezing and thawing, making visual guidance critical for successful execution of the protocol.
What media can be used for recovering iPS cells?
Both complete KnockOut SR Feeder Free medium and feeder-based KnockOut SR medium can be used for recovery.
How does the size of cell colonies affect recovery?
Keeping cell colonies uniform in size improves overall recovery rates post-thaw.
What temperature is used for initial cryopreservation?
Cells are initially frozen at -80 degrees Celsius before being transferred to liquid nitrogen for long-term storage.
What is the role of KnockOut SR products in this protocol?
KnockOut SR products are used throughout the workflow for derivation, growth, and cryopreservation of iPS cells.
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