Cryopreservation method for Entamoeba histolytica trophozoites

Area of Science:

• Parasitology
• Cell Biology
• Microbiology

Background:

• Entamoeba histolytica (E. histolytica) causes amebiasis, a significant global health issue.
• E. histolytica trophozoites are crucial for disease pathogenesis and various biological research fields.
• Current cryopreservation methods for E. histolytica lack high revival rates and widespread adoption, hindering research.

Purpose of the Study:

• To optimize cryopreservation conditions for Entamoeba histolytica (E. histolytica) trophozoites.
• To establish a reliable method ensuring high revival rates for E. histolytica cryopreservation.
• To facilitate continuous amebic research by minimizing the loss of E. histolytica parasite lines.

Main Methods:

• Systematic optimization of cryopreservation parameters including cell density, cooling rate, freezing reagent, and freezing profile.
• Suspension of E. histolytica trophozoites in CELLBANKER 2 at a density of 2 × 10^6 cells/mL.
• Controlled freezing from 4 to -40°C at -0.2°C/min using VIA Freeze Uno.

Main Results:

• Achieved reproducible revival rates exceeding 30% for E. histolytica trophozoites.
• Viability remained high regardless of storage duration in liquid nitrogen (up to 365 days).
• The optimized method demonstrated consistent high revival rates.

Conclusions:

• An optimized cryopreservation protocol for Entamoeba histolytica (E. histolytica) trophozoites has been developed.
• This method ensures high revival rates, supporting sustained amebic research.
• The established protocol mitigates the risk of losing essential E. histolytica lines, advancing research continuity.