Leishmania major (Yakimoff and Schokhor) Bray et al. (ATCC® 50122)

Strain Designations: MHOM/IL/67/JERICHO II  /  Depositor: WRAIR  /  Biosafety Level: 2

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Strain Designations MHOM/IL/67/JERICHO II
Application
Vector borne research
Biosafety Level 2
Isolation
human, Jericho, Israel, Occupied Territory, 1967
Product Format frozen
Type Strain no
Comments
WHO reference strain. Promastigotes.
Selective killing of amastigotes
Medium Medium 807: Brain heart infusion blood agar
Growth Conditions
Temperature: 25.0°C
Duration: axenic
Protocol: ATCCNO: 11745 SPEC: See general instructions for thawing and storage of frozen material before proceeding. Add thawed contents to a single 16 x 125 mm glass screw-capped test tube of the appropriate medium. Incubate the culture vertically with the cap screwed on tightly. It is essential to establish cultures initially in small volumes. Once established, the culture can be scaled up to larger volumes. Vigorously agitate the culture and aseptically transfer 0.1 ml of culture to a fresh tube of medium weekly.
Subcultivation
Protocol: ATCCNO: 11745 SPEC: See general instructions for thawing and storage of frozen material before proceeding. Add thawed contents to a single 16 x 125 mm glass screw-capped test tube of the appropriate medium. Incubate the culture vertically with the cap screwed on tightly. It is essential to establish cultures initially in small volumes. Once established, the culture can be scaled up to larger volumes. Vigorously agitate the culture and aseptically transfer 0.1 ml of culture to a fresh tube of medium weekly.
Cryopreservation

1.   Harvest cells from a culture which is at or near peak density by centrifugation at 1,300 g for 5 min.

2.   Adjust concentration of cells to 2 x 107/ml in fresh medium.

3.   While cells are centrifuging prepare a 10% (v/v) solution of sterile DMSO in fresh medium (broth).  The DMSO solution when first prepared will warm up due to chemical heat. The solution should be allowed to return to room temperature prior to use.

4.   Mix the cell preparation and the DMSO solution in equal portions. The final concentration will be 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 be no more than 15 min.

5.   Dispense in 0.5 ml aliquots into 1.0 - 2.0 ml sterile plastic screw-capped cryules (special plastic vials for cryopreservation).

6.   Place the ampules 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.)  

7.   Store in either the vapor or liquid phase of a nitrogen refrigerator.

8.   To thaw a frozen ampule, place it in a 35°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.

9.   Immediately after thawing, do not leave in the water bath, aseptically transfer the contents of the ampule into a fresh tube of ATCC medium 807. 

10.          Incubate vertically at 25°C with the cap screwed on tightly.

11.          Maintain as described above. 

Name of Depositor WRAIR
Chain of Custody
ATCC <<--WRAIR<<--Hebrew Univ
Year of Origin 1967
References

Jacobson RL, et al. Surface reaction of Leishmania. I. Lectin-mediated agglutination. Ann. Trop. Med. Parasitol. 76: 45-52, 1982. PubMed: 7082078

Muyombwe A, et al. Selective killing of Leishmania amastigotes expressing a thymidine kinase suicide gene. Exp. Parasitol. 85: 35-42, 1997. PubMed: 9024200

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