Can Organoids Be Stored Long-Term?

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°