Proline-conditioning and chemically-programmed ice nucleation protects spheroids during cryopreservation.

Area of Science:

• * Biomedical Engineering
• * Cell Biology
• * Cryobiology

Background:

• * Spheroids offer a more accurate 3-D tissue model compared to traditional cell cultures.
• * Conventional cryopreservation methods struggle to protect spheroids from damage during freezing and thawing.
• * Existing cryoprotectants are insufficient to address all damage mechanisms in spheroids.

Purpose of the Study:

• * To investigate novel strategies for improving spheroid cryopreservation.
• * To address both biochemical and biophysical damage pathways during cryopreservation.
• * To enhance post-thaw recovery rates of cryopreserved spheroids.

Main Methods:

• * Utilized chemically-programmed extracellular ice nucleation to prevent supercooling.
• * Employed proline pre-conditioning as a protective strategy.
• * Assessed the synergistic effects of these methods on spheroid recovery.

Main Results:

• * Chemically-programmed extracellular ice nucleation effectively prevented supercooling.
• * Proline pre-conditioning demonstrated protective effects on spheroid viability.
• * The combination of these methods synergistically improved post-thaw spheroid recovery.

Conclusions:

• * Novel cryopreservation strategies are essential for maintaining spheroid integrity.
• * Addressing both ice formation and biochemical stress is key to successful spheroid cryopreservation.
• * Further research into compounds and materials is needed to optimize cryoprotection beyond current standards.