KC-1925

CHOK1-PDL1 Cell Line

23065

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Background of CHOK1-PDL1 Cell Line

PD-L1, also called human programed cell death ligand 1, is a transmembrane protein that play a major role in suppressing the immune system during particular events such as pregnancy, tissue allografts, autoimmune disease, virus infection and cancer. PD-L1 binds to its receptor PD-1 on activated T cells, B cells, and myeloid cells, to modulate activation or inhibition. Upregulation of PD-L1 can allow cancer cell to evade the host immune system.

Specifications

Catalog Number	KC-1925
Cell Line Name	CHOK1-PDL1 Cell Line
Clone Number	NA
Host Cell Line	CHOK1
Description	Stable CHOK1 cell line expressing exogenous PDL1 gene
Quantity	One vial of frozen cells (≥2-10⁶/vial)
Stability	Stable in culture over a minimum of 10 passages
Application	Drug screening and biological assays
Freezing Medium	70% RPMI1640 + 20% FBS + 10% DMSO
Propagation Medium	RPMI1640+10%FBS+10μg/mL Puromycin
Selection Marker	Puromycin
Morphology	Epithelial
Subculture	Split saturated culture 1:4-1:8 every 2-3 days; seed out at about 1-3 × 10⁵ cells/mL
Incubation	37 °C with 5% CO₂
Storage	Liquid nitrogen immediately upon receiving
Doubling Time	Approximately 30 hours
Mycoplasma Status	Negative
In Vivo Validation	NA

Cell Line Generation

CHOK1-PDL1 Cell Line was generated using a lentiviral vector expressing the PDL1 sequence.

Characterization

Figure 1: Characterization of PDL1 overexpression in the CHOK1-PDL1 stable clone using FACS.

Cell Resuscitation

Prewarm culture medium (RPMI1640+10%FBS+10μg/mL Puromycin)in a 37°C water bath.
Thaw the frozen vial in a 37°C water bath for 1-2 minutes.
Transfer the vial into biosafety cabinet, and wipe the surface with 70% ethanol.
Unscrew the top of the vial and transfer the cell suspension gently into a sterile centrifuge tube containing 9.0mL complete culture medium.
Spin at ~ 125 × g for 5-7 minutes at room temperature, and discard the supernatant without disturbing the pellet.
Resuspend cell pellet with the appropriate volume of complete medium and transfer the cell suspension into a T25 culture flask.
Incubate the flask at 37°C, 5% CO₂ incubator.
Split saturated culture 1:4-1:8 every 2-3 days; seed out at about 1-3 × 10⁵ cells/mL.

Cell Freezing

Prepare the freezing medium (70% RPMI1640 + 20% FBS + 10% DMSO) fresh immediately before use.
Keep the freezing medium on ice and label cryovials.
Transfer cells to a sterile, conical centrifuge tube, and count the cells.
Centrifuge the cells at 250×g for 5 minutes at room temperature and carefully aspirate off the medium.
Resuspend the cells at a density of at least 3×10⁶ cells/mL in chilled freezing medium.
Aliquot 1 mL of the cell suspension into each cryovial.
Freeze cells in the CoolCell freezing container overnight in a -80°C freezer.
Transfer vials to liquid nitrogen for long-term storage.

References

Sunshine, J. & Taube, J. M. PD-1/PD-L1 inhibitors. Current Opinion in Pharmacology 23, 32–38 (2015).
Boussiotis, V. A. Molecular and Biochemical Aspects of the PD-1 Checkpoint Pathway. N Engl J Med 375, 1767–1778 (2016).
Topalian, S. L. et al. Safety, activity, and immune correlates of anti-PD-1 antibody in cancer. N Engl J Med 366, 2443–2454 (2012).

Use License Agreement

Research Use Only.

Not for use in diagnostic procedures or therapeutic applications.

Redistribution of the cell line or its derivatives is prohibited without prior written permission from Kyinno Biotechnology.