Human Th17 Staining Kit (2-8℃) – FAQs & Protocol Guide

Human Th17 Staining Kit (2-8℃ Components) is a specialized flow cytometry reagent system designed for the reliable detection and immunophenotyping of human Th17 cells, combining surface and intracellular staining components optimized for storage at 2–8℃.

SKU

H1521238WT

Storage Temperature

2–8℃ (do not freeze)

Application

Flow cytometry – human Th17 cell immunophenotyping

Target Cell Type

Human CD4⁺ T helper 17 (Th17) cells

Key Markers Detected

Typically includes surface and/or intracellular markers associated with Th17 lineage (e.g., IL-17A, CD4, CCR6)

Species Reactivity

Human

Product Overview and Intended Use

The Human Th17 Staining Kit (2-8℃ Components), catalog number H1521238WT, is formulated for the identification and characterization of human Th17 cells by flow cytometry. Th17 cells are a subset of CD4⁺ T helper lymphocytes defined by their capacity to produce interleukin-17 (IL-17) and their role in mucosal immunity, autoimmunity, and inflammatory disease. Accurate staining of this population requires both surface marker labeling and intracellular cytokine detection, steps that must be carefully coordinated to preserve antigen integrity and cell morphology.

All components in this kit are optimized for storage at 2–8℃, making cold-chain management straightforward. This kit is intended for research use only (RUO) and is not approved for diagnostic or therapeutic applications.

Storage, Handling, and Stability

All components of this kit must be stored at 2–8℃ and should not be frozen unless explicitly instructed otherwise in the package insert. Freezing can denature antibody conjugates and compromise the integrity of fixation or permeabilization buffers, leading to unreliable staining results.

Key handling recommendations include:

• Keep reagents protected from prolonged light exposure, especially fluorochrome-conjugated antibodies.
• Allow reagents to equilibrate to room temperature for 10–15 minutes before use, unless the protocol specifies otherwise.
• Avoid repeated freeze-thaw cycles; if long-term storage beyond the labeled expiry is required, consult Aladdin Scientific technical support.
• Do not use components beyond the printed expiration date.

Stability data specific to this lot should be referenced on the Certificate of Analysis (CoA) available from Aladdin Scientific.

Recommended Staining Protocol

The following outlines a general workflow for Th17 staining using this kit. Always refer to the product's package insert or datasheet for lot-specific volumes and incubation times.

1. Cell Stimulation (if detecting intracellular cytokines): Stimulate peripheral blood mononuclear cells (PBMCs) or whole blood with a polyclonal stimulant (e.g., PMA and ionomycin) in the presence of a protein transport inhibitor (e.g., brefeldin A or monensin) for 4–6 hours at 37℃ in 5% CO₂. This step is required to accumulate intracellular IL-17A to detectable levels.
2. Surface Staining: After stimulation, wash cells and stain with surface marker antibodies included in the kit (e.g., anti-CD4) at 4℃ for 20–30 minutes, protected from light.
3. Fixation and Permeabilization: Fix and permeabilize cells using the fixation and permeabilization buffers provided with the kit. This step enables intracellular antibodies to access cytoplasmic targets.
4. Intracellular Staining: Incubate permeabilized cells with intracellular antibodies (e.g., anti-IL-17A) in the permeabilization buffer for 20–30 minutes at room temperature or 4℃, protected from light.
5. Washing and Acquisition: Wash cells twice with permeabilization buffer, resuspend in an appropriate buffer, and acquire on a flow cytometer. Set compensation controls and fluorescence-minus-one (FMO) controls appropriately.

Results should be gated on live, single, CD4⁺ lymphocytes before assessing IL-17A positivity to define the Th17 population.

Troubleshooting Common Issues

If unexpected results are encountered, consult the following troubleshooting guidance:

Problem	Possible Cause	Suggested Action
Low or absent Th17 signal	Insufficient cell stimulation or inadequate protein transport inhibition	Verify stimulation reagent activity and inhibitor concentration; confirm incubation time and temperature
High background / non-specific staining	Inadequate blocking or permeabilization buffer carryover	Include FMO controls; optimize antibody titration; ensure thorough washing steps
Poor cell viability after fixation	Over-fixation or use of incompatible fixative	Use only the fixation reagent provided; adhere strictly to recommended incubation times
Reagent appears turbid or precipitated	Freezing of 2–8℃ components or expired reagent	Do not use; contact Aladdin Scientific for replacement

For issues not resolved by the above, contact Aladdin Scientific technical support with your lot number and CoA.

Compatibility, Panel Design, and Quality Specifications

The Human Th17 Staining Kit (2-8℃ Components) is optimized for use with human samples (peripheral blood, PBMCs, or tissue-derived cells). Cross-reactivity with non-human primate or rodent samples has not been validated for this kit and should not be assumed.

Panel Design Considerations:

• When building a multicolor panel, account for fluorochrome spectral overlap and ensure that the brightest fluorochromes are assigned to the lowest-expressing markers.
• Include a viability dye compatible with the fixation step to exclude dead cells from analysis.
• Use isotype controls or FMO controls to accurately set positive/negative gates for each antibody in the panel.

Quality Specifications: Each lot of H1521238WT is quality-controlled by flow cytometry using human donor PBMCs. Lot-specific performance data, including staining indices and expected population frequencies, are documented on the Certificate of Analysis (CoA). Purity, concentration, and endotoxin levels (where applicable) are verified prior to release. Researchers are advised to request the CoA from Aladdin Scientific before commencing experiments.

Frequently asked questions

What is the correct storage condition for the Human Th17 Staining Kit (2-8℃ Components)?

All components should be stored at 2–8℃ and must not be frozen. Freezing can degrade antibody conjugates and buffer formulations, leading to compromised staining performance. Always protect reagents from prolonged light exposure.

Is cell stimulation required before using this kit to detect Th17 cells?

Yes, if intracellular cytokine detection (e.g., IL-17A) is included in your panel, cells must first be stimulated with a polyclonal activator such as PMA and ionomycin in the presence of a protein transport inhibitor (e.g., brefeldin A) for approximately 4–6 hours. This step is necessary to accumulate cytokines to detectable levels inside the cell. Surface markers can be detected without prior stimulation.

Can this kit be used with non-human primate or mouse samples?

This kit is validated for use with human samples only. Cross-reactivity with non-human primate or rodent samples has not been established for H1521238WT. Using the kit with non-human samples may yield unreliable or false-negative results. Contact Aladdin Scientific technical support if you require reagents validated for other species.

What controls should be included when running this Th17 staining panel?

Recommended controls include: (1) a viability dye control to exclude dead cells; (2) fluorescence-minus-one (FMO) controls for each antibody in the panel to accurately set positive/negative gates; and (3) an unstimulated cell sample run in parallel to assess background cytokine production. Isotype controls may also be used in addition to FMO controls for gating verification.

What should I do if I observe high background or no Th17 signal?

High background often results from insufficient washing or inadequate antibody titration — ensure all washing steps are completed thoroughly and consider re-titrating antibodies for your specific cell type and instrument. Absent Th17 signal is most commonly caused by ineffective cell stimulation or failure of the protein transport inhibitor; verify reagent activity and repeat stimulation. If the problem persists, contact Aladdin Scientific with your lot number for further technical assistance.

References

1. Harrington LE, Mangan PR, Weaver CT. Expanding the effector CD4 T-cell repertoire: the Th17 lineage. Current Opinion in Immunology. 2006;18(3):349-356. doi:10.1016/j.coi.2006.03.017
2. Aladdin Scientific. Certificate of Analysis for H1521238WT – Human Th17 Staining Kit (2-8℃ Components). Available from Aladdin Scientific upon request.
3. Picker LJ, Singh MK, Zdraveski Z, et al. Direct demonstration of cytokine synthesis heterogeneity among human memory/effector T cells by flow cytometry. Blood. 1995;86(4):1408-1419. PMID:7632944

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.