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Tips for Use (Part 2) | Tips for Amplifying γδ T Cells Using the γδ T Cell Expansion Kit (Cytokine-Based Method)
Background Introduction
Due to their MHC-independent recognition, lack of cytokine storms and off-target effects, broad-spectrum antitumor activity, and the absence of the need for genetic modification, γδT cells—coupled with their universal, low-cost expansion technology—are poised to become the next hot candidate in the field of allogeneic therapeutic pipelines. Leveraging its established immune-cell technology platform, Hycells has developed a γδT-cell expansion medium with a pure-factor formulation that specifically expands Vδ2 cells, achieving high expansion purity, robust cytotoxic activity, and sustained in vivo expansion capacity, thereby promptly addressing this growing market demand.
|
Number |
Name |
Specifications |
|
GD990-1L |
HiXpan™ γδT Cell Expansion Medium Kit |
1 kit |
Product advantages of the γδ T-cell expansion kit (cytokine-based method):
1. Pure-factor formulation;
2. Use fresh or cryopreserved PBMCs as the starting cells to perform directed expansion of Vδ2 T cells, achieving a 200–300-fold expansion; the process is scalable in a linear fashion.
3. Amplification purity exceeds 90%, with high cytotoxic activity and robust expression of CD56, NKG2D, and HLA-DR.
4. Possesses the ability to undergo continuous expansion within the body.
Over nearly a year of market deployment and customer feedback, the Heyousheng technical team has identified and systematically organized the most critical and pressing issues encountered during the use of the γδ T-cell expansion kit, enabling more partners to swiftly achieve their desired experimental outcomes.
Tips for Amplifying γδ T Cells Using a Cytokine-Based Kit
Q: Can the kit be aliquoted for use? If so, how should it be aliquoted?
A: Splitting into aliquots is permissible; however, due to minor volume variations between batches, it is recommended to centrifuge each component prior to aliquoting and to use a pipette to measure the total volume of the components before dividing them into aliquots according to the desired ratio.
For example, the kit recommends a starting sample volume of 15–20 mL of peripheral blood. In this experiment, we initiated expansion with 5 million cells. First, centrifuge the ABCDE factors, then use a pipette to measure the volumes. Divide each factor (A, B, C, D, and E) into four equal aliquots based on volume. Add one-quarter of factor A to 250 mL of basal culture medium, then add 2.5 mL of this mixture to 10% autologous plasma (blood substitute/FBS). Subsequently, add one-quarter of factors B, C, D, and E at the time points recommended in the protocol to initiate expansion.
Q: How long can factor A be stored after being added to the entire bottle of culture medium?
A: It is recommended to use the factor within one month, as its potency decreases when diluted to lower concentrations. If you cannot use the entire amount at once, it is advisable to aliquot the factor rather than preparing and using the entire batch in a single session.
Q: Is it permissible to gently pipette or blow on the cells during the early stages of expansion?
A: It is not recommended to gently pipette or disperse the cells during the first 7 days after expansion; simply replenish the culture medium according to the appropriate ratio. This is because, in the early stages, the cells are aggregating and being activated; vigorous pipetting to break up these aggregates may reduce the activation efficiency. Sampling for flow cytometry analysis is also not advised during the first 7 days. After Day 7, it is recommended to replenish the medium based on the cell count and then perform flow cytometry analysis.
Q: If the basal medium supplemented with factors A and E is not fully used, can it be retrieved and recombined with factors B, C, and D to initiate a new round of activation?
No, that is not permitted. If there is a need for batch-wise expansion, you may aliquot the factor or, after preparing the basal medium plus A, withdraw 10–20 mL and add factor E. The aliquoted portion can then be supplemented with B, C, and D within one month to initiate the next activation batch.
Q: How should the culture medium be brought to room temperature?
A: The prepared culture medium can be aliquoted into the amount needed for this experiment and allowed to equilibrate at 37°C; however, it is not recommended to place the entire bottle in a 37°C incubator for rapid warming, as repeated exposure to high temperatures may compromise the potency of the factors. If the entire bottle must be warmed, it is advisable to remove it from the freezer and allow it to equilibrate at room temperature for 1 hour beforehand.
Q: When should fluid replacement be administered?
A: For the first rehydration, it is recommended to perform rehydration on Day 3 or Day 4. The specific timing should be determined based on the degree of cell aggregation; under the microscope, rehydration can be initiated when more than approximately 30% of the cells are visibly clumped.
On Day 3, the cluster formation is not yet obvious; you can wait another day for fluid replacement.
Clumping is evident, and fluid replacement can be administered.
Note: If no obvious clumping is observed by Day 4, it is not recommended to wait any longer; fluid replacement can be administered directly, with subsequent monitoring of activation status.
Q: What is the usage of plasma, blood substitutes, and culture media?
A: Plasma, blood substitute, or FBS can all be used; in the early stage, it is recommended to add 10%, and during the expansion phase, 5% can be added. Subsequently, either the remaining autologous plasma should be added, or the amount of blood substitute/FBS should be reduced; however, plasma or blood substitute must not be omitted.
Q: Sample requirements?
A: Fresh samples yield the best amplification results, and the initial γδ T-cell proportion does not affect the final amplification outcome. However, when the VD2+ proportion in the sample exceeds 2%, the probability of successful amplification is higher; exceeding 5% is optimal. For cryopreserved samples, the cryopreservation medium plays a critical role in γδ T-cell amplification. Hycells offers a superior cryopreservation medium for immune cells (catalog no.: HYS01013) that provides excellent preservation of fragile cell types such as NK cells, monocytes, and GDT cells.
Q: What is the typical γδ T cell ratio in DAY7?
A: Under optimal expansion conditions, most donors achieve 60%–70% purity by Day 7.
Q: What is the ultimate purity that can be achieved through amplification?
A: With optimal expansion, the donor cells can achieve a purity of over 90% from Day 14 to Day 18.
Q: What is the maximum amplification fold?
A: Donor DAY14 samples with robust expansion exhibit a 100- to 300-fold increase in γδ T cells relative to the initial PBMCs after expansion.
Q: Which basal medium should be used?
A: We recommend using Hycells Base Medium (Catalog No.: GD990-M). The performance of other serum-free media available on the market must be validated against Hycells’ protocols.
γδT Cell Expansion Kit (Cytokine-Based Method) – Expansion Tips PDF File:
γδT Cell Expansion Kit (Cytokine-Based) – Expansion Tips.pdf
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