A Game-Changer for Immunological Research! UloveBio's Th17 Polarization Kit Makes Your Experiments So Easy!

In the intricate framework of the immune system, T helper 17 (Th17) cells, a crucial subset of CD4+ T cells, play a key role in defending against extracellular bacterial and fungal infections, while also acting as powerful drivers of autoimmune diseases. Whether studying mucosal immunity, infection defense, or exploring the pathogenesis of autoimmune diseases, mastering in vitro Th17 cell polarization technology has become an indispensable core skill!

Faced with complex cytokine combinations and intricate regulatory networks, do you feel unsure where to start with Th17 polarization? Rest assured, this "Complete Guide to Th17 Polarization" will unravel all the mysteries for you, taking you from the basics to mastery, comprehensively grasping the essence of human and mouse Th17 polarization!

Part 1: Theoretical Foundation – The Dual Nature of Th17 Cells

1. What are Th17 cells?

Th17 cells are a functionally distinct subset of CD4+ T cells that have gained significant attention in recent years. They are characterized by the secretion of signature cytokines such as IL-17A, IL-17F, and IL-22. They act as "Guardians of Mucosal Immunity," building the first line of defense against fungi and extracellular bacteria by recruiting neutrophils and maintaining epithelial barrier integrity. However, when dysregulated, they can transform into "Inflammatory Storm Triggers," driving the development and progression of various autoimmune diseases.

2. Why perform in vitro Th17 polarization?

• Mechanistic Exploration: Dissect the synergistic mechanisms of key factors like TGF-β and IL-6 in Th17 differentiation.

• Disease Research: Obtain Th17 cells for studying autoimmune diseases such as psoriasis, multiple sclerosis, and rheumatoid arthritis.

• Drug Screening: Establish Th17-related disease models to screen novel therapeutic drugs targeting the Th17 pathway.

• Immune Balance: Investigate the regulatory role of the Th17/Treg balance in immune homeostasis.
  
  

Part 2: Core Arsenal – Comprehensive Analysis of Polarizing Factors

The regulatory network governing Th17 differentiation is relatively complex, requiring precise cytokine combinations and appropriate use of inhibitors for successful polarization.

"Classic Triad" Signaling Pathways:

• TCR Activation Signal: Provided by anti-CD3/CD28 antibodies, delivering the fundamental signal for T cell activation.

• TGF-β + IL-6 Synergistic Initiation: The combination of TGF-β and IL-6 is the core driver for initiating Th17 differentiation, inducing the expression of the key transcription factor RORγt.

• Cytokine Reinforcement Network: IL-1β and IL-23 can further promote the proliferation and functional stabilization of Th17 cells.
  
  

Precision Control Strategies:

• Antibody Blocking: Use anti-IFN-γ and anti-IL-4 antibodies to effectively eliminate the competing interference from Th1 and Th2 differentiation pathways.

• Signaling Pathway Modulation: Create a favorable environment for Th17 differentiation by appropriately inhibiting STAT1/STAT4/STAT5 signaling.
  
  

This optimized polarization system efficiently induces the differentiation of naïve CD4+ T cells into functionally mature Th17 cells. Their typical characteristics include robust secretion of IL-17A and high expression of surface molecules like RORγt and CCR6, providing an ideal experimental platform for in-depth research into Th17 biological function.

Part 3: Practical Operation – Mouse and Human Th17 Polarization Protocols

A. Mouse Th17 Polarization Protocol

1. Cell Culture

• Coat a 48-well cell culture plate overnight with 10 µg/ml anti-mouse CD3ε mAb and 2 µg/ml anti-mouse CD28 mAb.

• The next day, after washing and blocking the plate, add sorted CD4+ T cells. Use RPMI-1640 medium supplemented with 10 µg/mL anti-IFN-γ, 10 µg/mL anti-IL-2, 10 µg/mL anti-IL-4, 50 ng/mL IL-6, 30 ng/mL TGF-β1, 10 ng/mL IL-23, 50 ng/mL IL-1β, 55 µM β-mercaptoethanol, and 10% FBS for culture.

• Starting at 48 hours, monitor cell concentration every 12 hours. If the cell density is high, split the cells into new wells and add the above culture medium for stimulation (without adding CD3 and CD28 antibodies for re-stimulation).

• After 5 days of culture, collect the cells, adjust the density to 10⁶/ml, and treat with 10 ng/ml PMA, 1 µg/ml Ionomycin, and 10 µg/ml Brefeldin A for 5 hours.
  
  

Negative Control Group (Th0 cells):

• Coat a 48-well cell culture plate overnight with 10 µg/ml anti-mouse CD3ε mAb and 2 µg/ml anti-mouse CD28 mAb.

• The next day, after washing and blocking the plate, add sorted CD4+ T cells. Maintain the cells in RPMI-1640 medium supplemented with 10% FBS, 55 µM β-mercaptoethanol, 10 µg/mL anti-mouse IFN-γ, and 10 µg/mL anti-mouse IL-4.

• Starting at 48 hours, monitor cell concentration every 12 hours. If the cell density is high, split the cells into new wells and add the above culture medium (without adding anti-mouse CD3ε and anti-mouse CD28 mAb). Culture for 5 days.

2. Flow Cytometry Analysis

• After collecting the cells, stain with flow cytometry antibodies and run on the flow cytometer.

• Suggested Antibody: BD Mouse IL-17A PE (clone: TC11-18H10.1
  

  Th17 Polarization Kit, Mouse/小鼠Th17极化套装_UA090020_优爱(UA BIOSCIENCE)官网

B. Human Th17 Polarization Protocol

1. Cell Culture

• Coat a 96-well cell culture plate overnight with 5 µg/ml anti-human CD3 mAb.

• The next day, after washing and blocking the plate, add CD4+ T cells sorted using CD4 Nanobeads, human (SOB5740). Use RPMI-1640 medium supplemented with 10 µg/mL anti-IFN-γ, 10 µg/mL anti-IL-4, 30 ng/mL human IL-6, 10 ng/mL TGF-β1, 20 ng/mL IL-23, 20 ng/mL IL-1β, 55 µM β-mercaptoethanol, 1 µg/ml anti-human CD28 mAb, and 10% FBS for culture.

• Starting at 48 hours, monitor cell concentration every 12 hours. If the cell density is high, split the cells into new wells and add the above culture medium for stimulation (without adding CD3 and CD28 antibodies for re-stimulation).

• After 5 days of culture, collect the cells, adjust the density to 10⁶/ml, and treat with 10 ng/ml PMA, 1 µg/ml Ionomycin, and 10 µg/ml Brefeldin A for 5 hours.

   

Negative Control Group (Th0 cells):

• Coat a 96-well cell culture plate overnight with 5 µg/ml anti-human CD3 mAb.

• The next day, after washing and blocking the plate, add sorted CD4+ T cells. Use RPMI-1640 medium supplemented with 10% FBS, 55 µM β-mercaptoethanol, 10 µg/mL Anti-human IL-4, 10 µg/mL Anti-Human IFN-γ, 200 U/ml IL-2, and 1 µg/ml anti-human CD28 mAb for culture.

• Starting at 48 hours, monitor cell concentration every 12 hours. If the cell density is high, split the cells into new wells and add the above culture medium (without adding CD3 and CD28 antibodies for re-stimulation). Culture for 5 days.

   

2. Flow Cytometry Analysis

• After collecting the cells, stain with flow cytometry antibodies and run on the flow cytometer.

• Suggested Antibody: Thermo 25-7179-42 IL-17A Monoclonal Antibody (eBio64DEC17), PE-Cyanine7

• Reference Kit: Th17 Polarization Kit, Human (UA090019) - UA BIOSCIENCE Official Website

• Th17 Polarization Kit, Human /人Th17极化套装_UA090019_优爱(UA BIOSCIENCE)官网
  
  

Disclaimer: The protocols provided in this article are general reference guides. Specific experimental conditions should be optimized based on your own experimental system.