CHO-PDCD1

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CHO-PDCD1 cells are recombinant Chinese hamster ovary (CHO) cells engineered to stably express human programmed cell death protein 1 (PD-1; PDCD1/CD279), an inhibitory immune checkpoint receptor primarily found on activated T cells, B cells, and other immune cell subsets. PD-1 is a type I transmembrane protein belonging to the immunoglobulin superfamily and functions as a critical regulator of immune tolerance through interaction with its ligands PD-L1 (CD274) and PD-L2 (PDCD1LG2). Stable PDCD1-expressing CHO models are commonly developed to provide controlled and reproducible receptor expression for cell-based binding and functional assays.

CHO-PDCD1 cells are widely used in immuno-oncology and therapeutic antibody development workflows, particularly for characterization of checkpoint inhibitor antibodies, ligand-receptor interaction studies, affinity measurements, and flow cytometry-based screening assays. These cells are also suitable for evaluating bispecific antibodies, engineered ligands, CAR-T targeting strategies, and receptor occupancy assays involving the PD-1/PD-L1 signaling axis. Because CHO cells exhibit robust growth characteristics, high transfection efficiency, and low endogenous expression of many human immune receptors, they provide a well-defined background for studying recombinant PD-1 biology and therapeutic targeting.

For adherent cultures: DMEM:Ham's F12 (1:1), w: 3.1 g/L Glucose, w: 2.5 mM L-Glutamine, w: 15 mM HEPES, w: 0.5 mM Sodium pyruvate, w: 1.2 g/L NaHCO3 (Cytion article number 820400a)

For suspension cultures: CHO Growth Medium A (from InSCREENeX; InSCREENeX catalog number INS-ME-1039)

37°C, 5% CO₂, humidified atmosphere.

After thawing, split the cells at a ratio of 1:2 to 1:3 in T25 flasks and allow the cells to recover from the freezing process and to adhere (for adherent cultures) for at least 24 hours.

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.