DT40

Transfection Host:  These cells may be used for stable transfection studies.

It lacks a normal c-myc gene, but contains two copies of an ALV deregulated myc gene.

The cells retain the ability to rearrange the immunoglobulin light chain gene (IgL).

At the IgL locus, DT40 contains one rearranged and one germline allele.

The cell line exhibits a lymphoblastoid phenotype.

Infectivity assays revealed that DT40 releases low levels of infectious RAV-1.

Both the c-rel gene and the v-rel oncogenes induce major histocompatibility (MHC) class II antigen expression on the DT40 cell line. 

The expression of MHC class II is induced more rapidly by v-rel than c-rel and several weeks after infection, rel induced class II antigen as much as 50 fold more efficiently than c-rel. 

1. Check all containers for leakage or breakage.
2. Remove the frozen cells from the dry ice packaging and immediately place the cells at a temperature below ­-130°C, preferably in liquid nitrogen vapor, until ready for use.

To insure the highest level of viability, thaw the vial and initiate the culture as soon as possible upon receipt. If upon arrival, continued storage of the frozen culture is necessary, it should be stored in liquid nitrogen vapor phase and not at -70°C.  Storage at -70°C will result in loss of viability.

1. Thaw the vial by gentle agitation in a 37°C water bath. To reduce the possibility of contamination, keep the O-ring and cap out of the water.  Thawing should be rapid (approximately 2 minutes).
2. Remove the vial from the water bath as soon as the contents are thawed, and decontaminate by dipping in or spraying with 70% ethanol. All of the operations from this point on should be carried out under strict aseptic conditions.
3. It is recommended that the cryoprotective agent be removed immediately.  Centrifuge the cell suspension at approximately 125 xg for 5 to 10 minutes.  Discard the supernatant and resuspend the cell pellet in an appropriate amount of fresh growth medium. 
4. Transfer the cell pellet to an appropriate size vessel.  It is important to avoid excessive alkalinity of the medium during recovery of the cells.  It is suggested that, prior to the addition of the vial contents, the culture vessel containing the growth medium be placed into the incubator for at least 15 minutes to allow the medium to reach its normal pH (7.0 to 7.6).
5. Incubate the culture at 37°C in a suitable incubator.  A 5% CO₂ in air atmosphere is recommended if using the medium described on this product sheet.

The product is provided 'AS IS' and the viability of ATCC^® products is warranted for 30 days from the date of shipment, provided that the customer has stored and handled the product according to the information included on the product information sheet, website, and Certificate of Analysis. For living cultures, ATCC lists the media formulation and reagents that have been found to be effective for the product. While other unspecified media and reagents may also produce satisfactory results, a change in the ATCC and/or depositor-recommended protocols may affect the recovery, growth, and/or function of the product. If an alternative medium formulation or reagent is used, the ATCC warranty for viability is no longer valid.  Except as expressly set forth herein, no other warranties of any kind are provided, express or implied, including, but not limited to, any implied warranties of merchantability, fitness for a particular purpose, manufacture according to cGMP standards, typicality, safety, accuracy, and/or noninfringement.

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