CTLL-2

CTLL-2, or cytotoxic T lymphocyte cell line-2, is an immortalized mouse cell line that originates from cytotoxic T cells. These cells were obtained through repetitive allogeneic Mixed Tumor-Lymphocyte Cultures (MTLC) of spleen cells from C57BL/6 mice immunized with F4-5 Friend virus (FLV)-induced leukemia cells. This specific derivation makes CTLL-2 a highly relevant model for studying T-cell mediated responses to viral oncogenesis and tumor immunology. The cell line requires the presence of interleukin-2 (IL-2) in its culture medium for survival and proliferation, emphasizing its utility in researching cytokine-driven cell processes.

In immunological research, CTLL-2 serves as a critical tool for examining various aspects of T-cell function and cytokine biology. Its dependency on IL-2 for growth and sustenance is particularly useful for exploring the signaling pathways activated by this cytokine, as well as the broader gene expression changes in T cells responding to external stimuli. Furthermore, CTLL-2 is employed in studies related to T-cell receptor (TCR) activation, leading to insights into cell proliferation, apoptosis, and cytokine secretion. These attributes make CTLL-2 essential for high-throughput screening assays aimed at discovering new immunomodulatory agents, and for testing the biological activity of IL-2 formulations, which are pivotal in cancer immunotherapy and autoimmune disease management.

37°C, 5% CO₂, humidified atmosphere.

1. Confirm that the vial remains deeply frozen upon delivery, as cells are shipped on dry ice to maintain optimal temperatures during transit.

2. Upon receipt, either store the cryovial immediately at temperatures below -150°C to ensure the preservation of cellular integrity, or proceed to step 3 if immediate culturing is required.

3. For immediate culturing, swiftly thaw the vial by immersing it in a 37°C water bath with clean water and an antimicrobial agent, agitating gently for 40-60 seconds until a small ice clump remains.

4. Perform all subsequent steps under sterile conditions in a flow hood, disinfecting the cryovial with 70% ethanol before opening.

5. Carefully open the disinfected vial and transfer the cell suspension into a 15 ml centrifuge tube containing 8 ml of room-temperature culture medium, mixing gently.

6. Centrifuge the mixture at 300 x g for 3 minutes to separate the cells and carefully discard the supernatant containing residual freezing medium.

7. Gently resuspend the cell pellet in 10 ml of fresh culture medium. For adherent cells, divide the suspension between two T25 culture flasks; for suspension cultures, transfer all the medium into one T25 flask to promote effective cell interaction and growth.

8. Adhere to established subculture protocols for continued growth and maintenance of the cell line, ensuring reliable experimental outcomes.

Mycoplasma contamination is excluded using both PCR-based assays and luminescence-based mycoplasma detection methods.

To ensure there is no bacterial, fungal, or yeast contamination, cell cultures are subjected to daily visual inspections.

For long-term preservation, place vials in vapor-phase liquid nitrogen at about −150 to −196 °C. Storage at −80 °C is acceptable only as a short interim step before transfer to liquid nitrogen.

Cryopreserved cell lines are shipped on dry ice in validated, insulated packaging with sufficient refrigerant to maintain approximately −78 °C throughout transit. On receipt, inspect the container immediately and transfer vials without delay to appropriate storage.

At Cytion, we stand behind the quality and viability of our products. We guarantee that our cells will be viable at the start of culture for 60 days after shipment from our facilities. We assure that all materials conform to the specifications described in the Certificate of Analysis and/or Product Sheet.

For full details, please refer to our Warranty Statement.