Trypanosoma cruzi Chagas (ATCC® PRA-330)

Strain Designations: Tulahuen LacZ clone C4  /  Depositor: FS Buckner  /  Biosafety Level: 2

Strain Designations Tulahuen LacZ clone C4
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.

Transgenic clone derived from Tulahuen strain, 1996
Product Format frozen
Type Strain no
Trypomastigotes expressing beta-galactosidase
Medium ATCC® Medium 2222: Cell Cultivation Medium for Parasites
Growth Conditions
Temperature: 35-37.0°C
Growth condition: Grown in BALB/3T3 mouse embryonic fibroblasts (ATCC CCL-163)

1.   Harvest Trypanosoma cultures when emergent parasites (trypomastigote stage) have reached or are near peak density in the liquid column. Gently invert the Trypanosoma culture flasks to suspend parasites in the liquid medium.

2.   Transfer the cell suspension (including parasites) to 15 ml plastic centrifuge tubes. Centrifuge at 1300 x g for 10 min.

3.   Remove all but 0.5 ml of the supernatant from each tube, resuspend the cell pellets, and pool them to a single tube.

4.   Adjust the parasite concentration to 2.0 - 4.0 x 107 cells/ml with fresh medium or PBS.

      NOTE: If the concentration of parasites is too low, centrifuge at 1300 x g for 10 min and resuspend in the volume of fresh medium or PBS required to yield the desired concentration.

5.   Prepare a cryoprotective solution containing 10% (v/v) DMSO in fresh medium or PBS.

6.   Mix the cell preparation and cryoprotective solution in equal portions. The final concentration will be 1.0 - 2.0 x 107 cells/ml and 5% DMSO. The time from the mixing of the cell preparation and cryoprotective solution to the start of the freezing process should be no less than 15 min and no more than 30 min.

NOTE: To prevent culture contamination, penicillin-streptomycin solution (ATCC® 30-2300™) may be added to a final concentration of 50 to 100 I.U./ml penicillin and 50 to 100 µg/ml streptomycin.

7.   Dispense in 0.5 ml aliquots to 1.0-2.0 ml sterile plastic screw-capped cryovials.

8.   Place cryovials in a controlled rate freezing unit. From room temperature cool at -1°C/min to -40°C. If freezing unit can compensate for the heat of fusion, maintain rate at -1° C/min through heat of fusion. At -40°C plunge ampules 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.)

9.   Store frozen ampules in either the vapor or liquid phase of a nitrogen refrigerator.

10.          To thaw a frozen ampule, place it in a 35-37°C water bath such that the lip of the ampule remains above the water line. Thawing time is approximately 2 to 3 minutes.  Do not agitate the ampule.  Do not leave ampule in water bath after thawed.

11.          Immediately after thawing, aseptically transfer contents to a T-25 tissue culture flask containing a fresh monolayer of ATCC® CCL-163™ cells and 10 ml ATCC® 30-2002™ with 10% (v/v) HIFBS.

12.          Outgas the flask for 10 seconds with a 95% air, 5% CO2 gas mixture.

13.          Incubate in a 35-37°C CO2 incubator with the cap screwed on tightly.

Name of Depositor FS Buckner
Year of Origin 1996

Buckner FS, et al. Efficient technique for screening drugs for activity against Trypanosoma cruzi using parasites expressing beta-galactosidase. Antimicrob. Agents Chemother. 40: 2592-2597, 1996. PubMed: 8913471

Buckner FS, et al. Detection of live Trypanosoma cruzi in tissues of infected mice by using histochemical stain for beta-galactosidase. Infect. Immun. 67: 403-409, 1999. PubMed: 9864242

Kraus JM, et al. Rational modification of a candidate cancer drug for use against Chagas disease. J. Med. Chem. 52: 1639-1647, 2009. PubMed: 19239254