Antigenic analysis of virulent and avirulent strains
Biosafety Level
2
Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.
Isolation
pigeon, Columba livia, Colorado Springs, CO, 1968
Product Format
frozen
Storage Conditions
Frozen: -70°C or colder for 1 week, vapor phase of liquid nitrogen for long-term storage
Axenic/Xenic
Axenic
Type Strain
no
Comments
Antigenic analysis of virulent and avirulent strains
Medium
ATCC® Medium 2154: LYI Entamoeba medium
Growth Conditions
Temperature: 35°C
Atmosphere: Anaerobic
Cryopreservation
Harvest cells from a culture that is at or near peak density by centrifugation at 800 x g for 5 min. The cells grown in a medium containing agar are concentrated by centrifugation, a solid pellet does not form. The soft pellet is re-suspended to desired cell concentration with agar-free supernatant.
Adjust the concentration of cells to 2 x 106 - 107/ml in fresh medium.
While cells are centrifuging prepare a 10% (v/v) solution of sterile DMSO in fresh medium.
Add 1.0 ml of DMSO to an ice cold 20 x 150 mm screw-capped test tube;
Place the tube on ice and allow the DMSO to solidify (~5 min) and then add 9.0 ml of ice cold medium;
Invert several times to dissolve the DMSO;
Allow to warm to room temperature.
Mix the cell preparation and the DMSO in equal portions. Thus, the final concentration will be 106 - 107 cells/ml and 5% (v/v) DMSO. The time from the mixing of the cell preparation and DMSO stock solution before the freezing process is begun should no less than 15 min and no longer than 30 min.
Dispense in 0.5 ml aliquots into 1.0 - 2.0 ml sterile plastic screw-capped cryules (special plastic vials for cryopreservation).
Place the vials in a controlled rate freezing unit. From room temperature cool at -1°C/min to -40°C. If the freezing unit can compensate for the heat of fusion, maintain rate at -1°C/min through the heat of fusion. At -40°C plunge into liquid nitrogen. Alternatively, place the vials in a Nalgene 1°C freezing apparatus. Place the apparatus at -80°C for 1.5 to 2 hours and then plunge ampules into liquid nitrogen. (The cooling rate in this apparatus is approximately -1°C/min.)
The frozen preparations should be stored in either the vapor or liquid phase of a nitrogen refrigerator. Frozen preparations stored below -130°C are stabile indefinitely. Those stored at temperatures above -130°C are progressively less stabile as the storage temperature is elevated. Vials should not be stored above -55°C.
To establish a culture from the frozen state place an ampule in a water bath set at 35°C. Immerse the vial just to a level just above the surface of the frozen material. Do not agitate the vial.
Immediately after thawing, do not leave in the water bath, aseptically remove the contents of the ampule and inoculate a 16 x 125 mm screw-capped test tube containing 13 ml of ATCC medium 2154.
Incubate the culture on a 15° horizontal slant at 35°C.
Name of Depositor
BM Honigberg
Year of Origin
1968
References
Stepkowski S, Honigberg BM. Antigenic analysis of virulent and avirulent strains of Trichomonas gallinae by gel diffusion methods. J. Protozool. 19: 306-315, 1972. PubMed: 4624301
