KC-1236

CHOK1-FOLR1 Cell Line

21767

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Background of CHOK1-FOLR1 Cell Line

FOLR1, also known as FBP. The protein encoded by this gene is a member of the folate receptor family. Members of this gene family bind folic acid and its reduced derivatives, and transport 5-methyltetrahydrofolate into cells. This gene product is a secreted protein that either anchors to membranes via a glycosyl-phosphatidylinositol linkage or exists in a soluble form. Mutations in this gene have been associated with neurodegeneration due to cerebral folate transport deficiency. Due to the presence of two promoters, multiple transcription start sites, and alternative splicing, multiple transcript variants encoding the same protein have been found for this gene. Folates are B vitamins that function in one-carbon metabolism. Folate receptors are one of three major types of folate transporters. The folate receptors FOLR1 and FOLR2 are overexpressed in multiple cancers.

Specifications

Catalog Number	KC-1236
Cell Line Name	CHOK1-FOLR1 Cell Line
NCBI/UniProt Accession Number	NM_016729.3
Host Cell Line	CHOK1
Description	Stable CHOK1 cell line expressing exogenous FOLR1 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% RPMI-1640 + 20% FBS + 10% DMSO
Propagation Medium	RPMI-1640 + 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-FOLR1 Cell Line was generated using a lentiviral vector expressing the FOLR1 sequence.

Characterization

Figure 1: Characterization of FOLR1 overexpression in the CHOK1-FOLR1 stable clone using FACS.

Cell Resuscitation

Prewarm culture medium (RPMI-1640 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% RPMI-1640 + 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

Yazaki S, Kojima Y, Yoshida H, Takamizawa S, Kitadai R, Nishikawa T, Shimoi T, Sudo K, Saito A, Okuma HS, Tanioka M, Noguchi E, Uno M, Ishikawa M, Kato T, Fujiwara Y, Ohe Y, Yonemori K. High expression of folate receptor alpha is associated with poor prognosis in patients with cervical cancer. J Gynecol Oncol. 2022 Nov;33(6):e82.
Chen CI, Li WS, Chen HP, Liu KW, Tsai CJ, Hung WJ, Yang CC. High Expression of Folate Receptor Alpha (FOLR1) is Associated With Aggressive Tumor Behavior, Poor Response to Chemoradiotherapy, and Worse Survival in Rectal Cancer. Technol Cancer Res Treat. 2022 Jan-Dec;21:15330338221141795.
Nawaz FZ, Kipreos ET. Emerging roles for folate receptor FOLR1 in signaling and cancer. Trends Endocrinol Metab. 2022 Mar;33(3):159-174.