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iPSC-Derived Atrial Cardiomyocyte Protocol

Human iPSC–Derived Atrial & Ventricular Cardiomyocytes User Guide

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Catalog. No. Product Name Format Stock Conc. Storage on Arrival Thawing Instructions Storage Once Thawed
ax2508 Human iPSC-Derived Ventricular Cardiomyocytes (Male) 1.0 million cells/vial N/A Liquid Nitrogen Follow protocol N/A
ax2518 Human iPSC-Derived Ventricular Cardiomyocytes (Female) 1.0 million cells/vial N/A Liquid Nitrogen Follow protocol N/A
ax2530-500 Cardiomyocyte Maintenance Medium 1 x 500 mL Basal Medium
1 x 10 mL Supplement		 1x
1x		 Store the Basal Medium at 4ºC and the Supplement at -80ºC Thaw the Supplement overnight at 4ºC Once thawed store at 4ºC. If required, the medium can be aliquoted and stored at -80ºC for later use.
ax0049 Fibronectin Coating Solution 1 mL 100x Aliquot and store at -80ºC for up to 3 months Thaw at 4ºC Once diluted, use immediately
ax2500 Human iPSC-Derived Ventricular Cardiomyocyte Kit – Male

Kit Components:

  • 1 million cells
  • Cardiomyocyte Maintenance Medium
  • Fibronectin Coating Solution
 See above for component details See above for component details See above for component details See above for component details
Product Name Supplier Product Code
Y-27632 dihydrochloride (ROCK inhibitor) Focus Biomolecules 10-2301
Fetal bovine serum (FBS)-EU Approved heat inactivated Sigma Aldrich F9665-500ML
Individual experimental results may vary depending on the supplier and batch of FBS used. Lot specific information such as specifications and quality control details are stated in the Certificate of Analysis.

Recommendations

  • Recommended culture vessel: Greiner 96 well, Part no. 655090
  • Recommended culture vessel coating: Fibronectin
  • Recommended cell culture medium: Cardiomyocyte Maturation Medium
  • Recommended seeding density for assay: 100,000 – 200,000 cells/cm2
  • Recommended centrifugation speed: 200 x g for 5 minutes
  • Recommended days in culture before assay: 7 – 10 days

Important!
Cardiomyocyte Maintenance Medium = Basal medium + Supplement DOES NOT contain antibiotics or antifungal agents. Axol Bioscience does not recommend the use of antimicrobial agents such as penicillin, streptomycin and amphotericin. Antimicrobial agents should not be necessary if proper aseptic technique is adopted.

Preparation of reagents

Cardiomyocyte Maintenance Medium

  • Upon receipt store Cardiomyocyte Maintenance Medium at or below 4°C and supplement at -80°C.
  • Add the Supplement to the Cardiomyocyte Maintenance Basal Medium.
  • For long-term storage, prepare aliquots of Cardiomyocyte Maintenance Medium and store at -80°C. The Cardiomyocyte Maintenance Medium is then stable for 6 months from the date of manufacture.

Plating Medium

  • When ready to use, thaw an aliquot of Cardiomyocyte Maintenance Medium
  • overnight in the dark at 4°C.
  • Take an aliquot of Cardiomyocyte Maintenance Medium and add 10% fetal bovine serum (FBS) and Y-27632 2HCl (ROCK inhibitor) to a final concentration of 10 μM to make the Plating Medium.
    Supplement Stock Concentration Final Concentration Final Volume in 50 ml of Medium
    Y-27632 dihydrochloride (ROCK inhibitor) 10 mM 10 μM 50 μl
    Fetal bovine serum (FBS) NA NA NA
  • Before use, pre-warm an aliquot of Plating Medium at 37°C

Coating the Culture Vessel

Fibronectin Coating

  • Calculate the total volume that is required for coating.
  • Dilute the stock Fibronectin Coating Solution 1:100 in sterile water to make a 1x working solution e.g. 100 μl in 10 ml.
  • On the day prior to thawing the cells, coat the surface of your culture vessel with the Fibronectin 1x working solution. We recommend coating at a minimum volume of 100 μl per well of a 96 well plate. However, please optimize for your experiments.
  • Incubate the culture vessel overnight at 37°C in a humidified incubator

Thawing & Plating Human iPSC-Derived Atrial & Ventricular Cardiomyocytes

  • On the day of thawing Human Derived Atrial or Ventricular Cardiomyocytes, prepare the Cardiomyocyte Maintenance Medium and Plating Medium.
  • To thaw the cells, transfer the cells from liquid nitrogen storage by carrying cells buried in dry ice. Remove the cells from dry ice and transfer them immediately to a 37°C water bath.
  • Quickly thaw the vial of cells in a 37°C water bath, taking care not to completely submerge the vial (only up to two thirds should be placed in the water). Remove the vial before the last bit of ice has melted, ~ 2 minutes.
  • Do not shake the vial whilst thawing.
  • Take the vial of cells to a biological cabinet, spraying it thoroughly with 70% ethanol and wipe with an autoclaved paper towel before placing in the culture hood.
  • Once thawed, use a P1000 to immediately transfer the cells to a 15 ml sterile conical tube.
  • Using a P1000, wash the now empty cryovial with 1 ml of room temperature Plating Medium. Add the 1 ml of Plating Medium to the conical tube containing the Cardiomyocytes.
  • Important – the Plating Medium should be added to the cells drop-wise whilst gently swirling the conical tube. This should take ~ 60 seconds to dispense the 1 ml of medium. This is a necessary step to prevent osmotic shock to the cells and improve post thaw viability.
  • Using a 10 ml stripette, slowly add 8 ml of room temperature Plating Medium to conical tube containing the cells. This should take ~ 60 seconds to dispense the 8 ml of medium.
  • Centrifuge the cells at 200 g for 5 minutes at room temperature.
  • Aspirate and discard the supernatant, taking care not to disturb the cell pellet.
  • Using a P1000, resuspend the pellet in 1 ml of warm (37°C) Plating Medium. Gently resuspend the cell pellet until a single cell suspension is obtained.
  • Perform a cell count to ensure optimal seeding density.
  • Remove 10 μl of cell suspension and mix it with 10 μl of trypan blue solution. Count the cells.
  • Using warm, 37°C Plating Medium, resuspend the cells to give the required plating density.
  • Remove the fibronectin solution from the plate to be seeded, take care to work quickly so that the plate does not dry out.
  • Plate the cells at a density of 100,000 – 200,000 cells/cm2. Depending on application, this density may require optimization

Please note that this is a recommended seeding density and that density may need to be optimized by the user to suit their culture dish size, culture conditions and the final assay