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  • ‹ Back to Pluripotent stem cells
  • Single-cell cloning with DEF-CS 500 Culture System
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Home › Learning centers › Stem cell research › Protocols › Pluripotent stem cells › Transferring iPSCs from other media to DEF-CS

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User-generated protocol

Transferring iPSCs from other feeder-free culture systems to the DEF-CS culture system

Introduction Materials required Protocol

Introduction  

Undifferentiated human iPS cells maintained in other feeder-free culture systems can be readily transferred to the DEF-CS culture system. Cryopreserved human iPS cells can be thawed directly using the DEF-CS culture system. Fresh cultures should be transferred on days when they would normally be passaged.

Materials required  

  • Cellartis DEF-CS 500 Culture System (Takara Bio, Cat. # Y30010)
    (includes COAT-1, Basal Medium, GF-1, GF-2, and GF-3)
  • TrypLE Select Enzyme (1X), no phenol red
    (Thermo Fisher Scientific, Cat. #12563011)
  • PBS Dulbecco's with Ca2+ & Mg2+ (D-PBS +/+)
  • PBS Dulbecco's w/o Ca2+ & Mg2+ (D-PBS –/–)
  • Cell culture vessels, tissue-culture-treated polystyrene surface

Protocol  

Transferring fresh or frozen cultures to the DEF-CS system

Preparation

  • Coating of cell culture vessels
    1. Dilute the required volume of DEF-CS COAT-1 in D-PBS +/+ before use. Make a 1:10 dilution.
    2. Mix the diluted DEF-CS COAT-1 solution gently and thoroughly by pipetting up and down.
    3. Add an appropriate volume of diluted DEF-CS COAT-1 solution to a cell culture vessel (use 0.1 ml/cm2), making sure that the entire surface is covered.
    4. Incubate the cell culture vessel at 37°C ± 1°C, 5% CO2, and >90% humidity for a minimum of 20 min, or at room temperature (15–25°C) for 0.5–3 hr.
    5. Aspirate the DEF-CS COAT-1 solution from the cell culture vessel immediately before use.
  • Preparing supplemented DEF-CS medium
    1. Prepare the appropriate volume of supplemented DEF-CS medium by adding DEF-CS GF-1 (dilute 1:333), GF-2 (dilute 1:1,000), and GF-3 (dilute 1:1,000) to DEF-CS Basal Medium.
    2. Prepare fresh medium on the day of intended use and warm it to 37°C ± 1°C immediately before use. Discard any leftover warm medium.
    3. Warm all other necessary reagents to room temperature (15–25°C) before use.

Transferring fresh hiPS cells from other feeder-free, monolayer culture systems

Fresh cultures should be transferred on days when they would normally be passaged. It is important to count the cells and use the recommended seeding density of 5–7 x 104 cells/cm2.

  1. Check cells under a microscope; photo document as necessary.
  2. Aspirate the medium from the cell culture vessel and wash the cell layer once with D-PBS –/–.
  3. Add 20 μl/cm2 of TrypLE Select Enzyme (1X) to the cell culture vessel and incubate for 5 min, or until the cell layer has detached. Detachment can be aided by swirling the cell culture vessel or by tapping the side of the cell culture vessel firmly but gently.
  4. Resuspend the cells in prewarmed, supplemented DEF-CS medium (40 μl/cm2) and pipet up and down several times to ensure a single-cell suspension. (The cells will aggregate if left too long in TrypLE Select Enzyme).
  5. Centrifuge the cells at 200g for 2–5 min.
  6. Count the cells in a hemocytometer or in a cell counter that has been optimized for the cell type.
  7. Add the appropriate volumes of cell suspension and additional medium (if necessary) to the newly coated cell culture vessel to obtain 5.0–7.0 x 104 cells/cm2. The seeding volume of supplemented DEF-CS medium should be 0.15–0.25 ml/cm2.
  8. Tilt the vessel backwards and forwards gently to ensure that the cell suspension is dispersed evenly over the surface, then place in an incubator at 37°C ± 1°C, 5% CO2, and >90% humidity.

Transferring cryopreserved hiPS cells from other feeder-free, monolayer culture systems

We recommend a seeding density at thawing of 1.5–2.5 x 105 cells/cm2.

  1. Thaw the cells according to your preferred protocol.
  2. Transfer the cells to a newly coated cell culture vessel with prewarmed, supplemented DEF-CS medium.
  3. Tilt the vessel backwards and forwards gently to ensure that the cell suspension is dispersed evenly over the surface, then gently place in an incubator at 37°C ± 1°C, 5% CO2, and >90% humidity.

Scaling up

The single-cell passaging method employed by the DEF-CS culture system causes iPS cells to initially assume a distinct morphology and sparser distribution relative to cells cultured using colony-based passaging methods. However, as the cells proliferate and form denser populations, morphologies commonly associated with undifferentiated stem cells (e.g., high nucleus-to-cytoplasm ratio, clearly defined borders, and prominent nucleoli) emerge.

  • It may take 2–5 passages to adapt a cell line to the DEF-CS culture system. Newly transferred cells might initially grow at a slightly slower rate. A suitable passage interval might, therefore, be between 3 and 7 days for the first few passages.
  • Use a 1:10 dilution of DEF-CS COAT-1:D-PBS +/+ for the first few passages to provide extra support during the adaptation process.
  • To prevent cell loss during scale-up, we recommend not counting cells at passage when the total number of cells is quite low.
  • If the hiPS cells were sparsely seeded or thawed in aggregates, they will grow as colonies on COAT-1. As a general rule, when passaging hiPS cells that are growing as colonies, the area covered by the cells at passage should not be less than 20% of the area of the destination vessel.
  • For passages involving cells growing in a homogeneous monolayer (normal DEF-CS culture system characteristics), cells are ready for passage when they have acquired the morphology displayed in Figures 3 and 4 in the Cellartis DEF-CS 500 Culture System User Manual. However, if cells remain sparsely distributed after seven days in culture, a passage is still recommended. The area of the destination vessel should be 3–6 times the area of the current vessel.
  • Once cells have been scaled up to a T-25 flask, they should be cultured according to the Cellartis DEF-CS 500 Culture System User Manual.

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User-generated protocols are based on internal proof-of-concept experiments, customer collaborations, and published literature. In some cases, relevant results are discussed in our research news BioView blog articles. While we expect these protocols to be successful in your hands, they may not be fully reviewed or optimized. We encourage you to contact us or refer to the published literature for more information about these user-generated and -reported protocols. 

If you are looking for a product-specific, fully optimized User Manual or Protocol-At-A-Glance, please visit the product's product page, open the item's product details row in the price table, and click Documents. More detailed instructions for locating documents are available on our website FAQs page.

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