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Figure 1. Recombinant CCR9 β-Arrestin CHO-K1 stably expressing CCR9

The blue curve represents CCR9 β-Arrestin CHO(C6) cells stained with anti-CCR9 antibody, median fluorescence intensity (MFI)=1.05E5. The red curve is parental CHO-K1 host cell control stained with the same antibody, MFI=289. The obvious fluorescence shift verifies high surface expression of human CCR9 receptor on this stable cell line.

Figure 2. Dose Response of Human Recombinant CCL25 in CCR9 β-Arrestin CHO-K1 (C6)

Dose-response curve induced by human recombinant CCL25 ligand, EC50 = 0.83 μg/mL. Data points represent mean ± SD. The result shows robust β-arrestin recruitment triggered by ligand-activated human CCR9 receptor.

Cell Resuscitation
1)Rapidly thaw the frozen cells in a 37 °C water bath for approximately 60 seconds. Once thawed (which may take slightly less or more than 60 seconds), immediately transfer the cell suspension from the cryovial into a 15 mL centrifuge tube containing 10 mL of pre-warmed CHO-K1 Human CCR9 β-Arrestin Cell Line complete culture medium.
2)Centrifuge cells at 1000 rpm for 5 min to remove medium, then resuspend cells in 5 mL of pre-warmed complete medium.
3)Transfer the cell suspension into a T25 culture flask and incubate at 37 °C with 5% CO₂.
4)After approximately 24–36 hours, replace the medium or passage the cells to remove non-adherent dead cells.

Subculturing procedure
1)When the cell density reaches the appropriate confluency for passaging, wash the cells with PBS, then add 1 mL trypsin to detach the cells. When more than 80% of the cells detach upon gently tapping the culture flask, add complete culture medium to terminate digestion. Gently pipette to obtain a single-cell suspension, transfer to a 15 mL centrifuge tube, and centrifuge at 1000 rpm for 5 minutes.

2)Discard supernatant after centrifugation. Resuspend cells in fresh medium to a single-cell suspension and transfer to a new culture flask for continued growth.

Cell Freezing
After trypsinization and centrifugation of cells from each T75 flask or 10 cm culture dish, discard the supernatant. Add 2 mL of cryopreservation medium (90% FBS + 10% DMSO), gently resuspend thoroughly, and aliquot into two cryovials. Immediately place the cryovials into a controlled-rate freezing container (e.g., Nalgene 5100-0001), fill with isopropanol to the indicated level, and store at −80 °C. After 24 hours, transfer the cryovials to liquid nitrogen for long-term storage.