TH2 cell release which type of IL
TH2 cells primarily release IL-4, IL-5, IL-10, and IL-13. These interleukins drive humoral immunity, IgE production, and eosinophil activation - key players in allergic responses and anti-parasitic defense.
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Here is a complete, textbook-backed answer:
Interleukins Released by TH2 Cells
TH2 cells (a subset of CD4+ helper T lymphocytes) secrete a characteristic profile of cytokines that drive humoral immunity, allergic responses, and defense against parasites.
Core TH2 Cytokines
| Cytokine | Key Actions |
|---|---|
| IL-4 | Signature TH2 cytokine. Drives naive CD4+ T cells to differentiate into the TH2 subset (positive feedback). Stimulates B cell class switching to IgE (and IgG4). Promotes alternative macrophage activation. Inhibits TH1 and TH17 development. |
| IL-5 | Activates and recruits eosinophils - critical for defense against helminths (parasitic worms). Also promotes IgA production. |
| IL-13 | Shares receptor components with IL-4 (both signal via IL-4Rα). Involved in mucosal barrier immunity, alternative macrophage activation, smooth muscle contraction, and goblet cell mucus secretion. |
| IL-10 | Anti-inflammatory; dampens TH1 responses and innate immune activation. |
Additional Cytokines
- IL-21 - TH2 (also TH17 and Tfh) cells produce this; drives B cell development.
- IL-25 (IL-17E) - produced at barrier surfaces, amplifies TH2 responses.
Memory Aid: "4, 5, 10, 13"
IL-4, IL-5, IL-10, IL-13 are the hallmark TH2 interleukins, with IL-4 being the master signature cytokine.
How They Work Together (TH2 Response)
- IL-4 → promotes IgE class switching + TH2 differentiation
- IgE → binds mast cells and basophils → allergic reactions
- IL-5 → activates eosinophils → anti-helminth defense
- IL-13 → mucosal immunity, mucus hypersecretion (important in asthma)
- IL-10 → suppresses TH1 inflammation
Loading Image
The diagram perfectly illustrates the TH2 cytokine network:
Summary
TH2 cells release primarily IL-4, IL-5, and IL-13 as their hallmark cytokines, with IL-10 also being a significant product:
| IL | Quick Mnemonic | Main Effect |
|---|---|---|
| IL-4 | "4-ward TH2 differentiation" | IgE switching, TH2 amplification |
| IL-5 | "5 fingers of an eosinophil" | Eosinophil activation |
| IL-13 | "13 = mucosal/mucus" | Mucus secretion, gut motility, macrophage M2 polarization |
| IL-10 | "Anti-10flammation" | Suppresses TH1 and innate inflammation |
Source: Cellular and Molecular Immunology (Abbas & Lichtman), Chapter 10 - Functions of TH2 cells.
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