Complete Guide to Organoid Cryopreservation
Q1: Can organoids be stored longterm?
Yes.
−80°C: Shortterm storage (≤ 1 month)
Liquid nitrogen (−196°C): Longterm storage (years, theoretically indefinite)
Q2: Prefreezing preparation
1.Use wellgrown organoids cultured for ≥ 5 days
2.Use passages P3–P4 (stable phenotype, strong proliferation)
3.Wash with prechilled PBS 3–5 times to completely remove Matrigel
Q3: Cryopreservation media
Classic: 90% serum + 10% DMSO
Serumfree: Clinicalgrade (e.g., CryoStor CS10)
Neural organoid: MEDY (methylcellulose + ethylene glycol + DMSO + Y27632)
Key Note:
DMSO is an essential component, typically used at 10% concentration.
Its role is to prevent ice crystal formation and protect cells from damage.
Q4: Freezing protocol
Slow freeze, rapid storage
1.Digest and collect organoids; centrifuge and remove supernatant
2.Resuspend in prechilled freezing medium at 200–300 organoids/tube or 1×10⁶ cells/mL
3.Gradient cooling: 4°C for 10 min → −20°C for 1 h → −80°C overnight
4.Transfer to liquid nitrogen (−196°C)
Q5: What is the most common mistake during thawing?
A: Thawing too slowly.
Correct procedure:
Warm rapidly in a 37°C water bath with gentle agitation; thaw completely within 1–2 minutes
Stop warming when only a small ice crystal pellet remains; do NOT wait for full liquefaction
Immediately add prewarmed medium to dilute, then centrifuge to remove cryoprotectant
Common cause of failure:
Thawing > 5 minutes → ice recrystallization → mechanical cell damage → organoid death
Q6: Can organoids be used normally after thawing?
A: Yes, but they need a recovery period.
Recommendations after thawing:
Perform a 1:1 passage to help cells adapt to the environment.
Observe cell adhesion and morphological recovery after 24 hours.
Verify functional integrity (e.g., tumor organoids maintain original genetic characteristics).
Studies show that with standardized protocols, organoid viability after thawing can reach 70–90%, and original morphology and function can be fully preserved.
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