KC-2391

CHOK1-cyno-Trop2-Cell-Line

23964

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Background of CHOK1-cyno-Trop2-Cell-Line

Trop2, also known as EGP1. This gene belongs to the tropomyosin family which encodes proteins that bind to actin filaments and stabilize them by regulating access to actin modifying proteins. The encoded protein is a high molecular weight tropomyosin expressed in slow skeletal muscle. In humans, mutations in this gene are associated with nemaline myopathy, cap disease and distal arthrogryposis syndromes. Alternative splicing of this gene results in multiple transcript variants encoding different isoforms. Since the monumental shift occurred with HER2-targeted ADCs, the discovery of the TROP2 antigen has revolutionized the landscape of ADC development.

Specifications

Catalog Number	KC-2391
Cell Line Name	CHOK1-cyno-Trop2-Cell-Line
Host Cell Line	CHOK1
Description	Stable CHOK1 cell line expressing exogenous cyno Trop2 gene
Quantity	Two vials 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 cyno Trop2 Cell Line was generated using a lentiviral vector expressing the cyno Trop2 sequence.

Characterization

Figure 1: Characterization of cyno Trop2 overexpression in CHOK1 stable clone using DNA sequencing.

Cell Resuscitation

Prewarm culture medium (RPMI1640 supplemented with 10% FBS and 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

Nelson BE, Meric-Bernstam F. Leveraging TROP2 Antibody-Drug Conjugates in Solid Tumors. Annu Rev Med. 2024 Jan 29;75:31-48. doi: 10.1146/annurev-med-071322-065903. Epub 2023 Sep 27. PMID: 37758237.