KC-1321

CHOK1-LAG3-Cell-Line

21923

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Background of CHOK1-LAG3-Cell-Line

Lymphocyte-activation gene 3(LAG3), also known as CD223, is a member of immunoglobulin superfamily, expressed on activated T cells, NK cells, B cells and DC cells. LAG3 can bind to MHC II molecules and induce maturation of DC cells, and cytokine secretion of cytotoxic T cells and NK cells. LAG3 is a promising drug target of cancer therapy and autoimmune disease, its therapeutic antibodies including BMS-986016 and GSK2831781 had already been used in the clinical trial.

Specifications

Catalog Number	KC-1321
Cell Line Name	CHOK1-LAG3-Cell-Line
Host Cell Line	Chinese hamster ovary CHO-K1 cell line
Description	Stable CHOK1 cell line expressing exogenous human LAG3 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+5µg/mL Puromycin
Selection Marker	Puromycin
Morphology	Epithelial-like
Subculture	Split saturated culture 1:4-1:8 every 2-3 days; seed out at about 1-2 × 10⁵ cells/mL
Incubation	37 °C with 5% CO₂
Storage	Liquid nitrogen immediately upon receiving
Doubling Time	Approximately 24 hours
Mycoplasma Status	Negative
In Vivo Validation	NA

Cell Line Generation

CHOK1 human LAG3 cell line was generated using a lentiviral vector expressing the human LAG3 sequence.

Characterization

Cell Resuscitation

Prewarm culture medium (F12K + 10% FBS + 5µg/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 1-2 × 10⁵ cells/mL.

Cell Freezing

Prepare the freezing medium (70% F12K + 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

Anderson, Ana C, Nicole Joller, and Vijay K Kuchroo. 2016. ¡ùLag-3, Tim-3, and TIGIT: Co-Inhibitory Receptors with Specialized Functions in Immune Regulation.¡ì Immunity 44 (5). Elsevier Inc.: 989Ã¿1004.
Huard, B, R Mastrangeli, P Prigent, D Bruniquel, S Donini, N El-Tayar, B Maigret, M Dr¹Èano, and F Triebel. 1997. ¡ùCharacterization of the Major Histocompatibility Complex Class II Binding Site on LAG-3 Protein..¡ì
Proceedings of the National Academy of Sciences 94 (11): 5744Ã¿49.

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.