cytokines celiac
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The immune system's messenger chemicals — released by activated T cells and other immune cells, they coordinate and amplify the intestinal damage.
Cytokines are small signalling proteins released by immune cells to communicate with neighbouring cells. In celiac disease, the cytokine environment in the inflamed intestine drives tissue destruction, perpetuates inflammation, and mediates many systemic effects.
Key Cytokines and Their Roles
IFN-γ (Interferon-gamma) The dominant pro-inflammatory cytokine in celiac disease. Released by activated CD4+ T cells after encountering gliadin-HLA complexes. IFN-γ activates macrophages, increases intestinal permeability, stimulates tissue-transglutaminase expression, and drives villous-atrophy. Also contributes to bone resorption by activating osteoclasts.
IL-15 (Interleukin-15) The innate immune alarm signal. Produced by epithelial cells in response to the gliadin p31–43/49 fragment. Drives IEL proliferation and activation. Critical in RCD type 2 where it drives aberrant IEL transformation.
IL-21 (Interleukin-21) Amplifies the T cell response and supports B cell differentiation into antibody-producing cells. Contributes to sustained anti-tTG antibody production.
IL-18 (Interleukin-18) Pro-inflammatory; activates natural killer (NK) cells and contributes to the innate immune response. Involved in bone metabolism disruption.
IL-6 (Interleukin-6) General inflammatory cytokine; elevated in active celiac. Contributes to systemic inflammation, fever, and acute phase response.
IL-33 Activates eosinophils and innate lymphoid cells; studied in the context of cendakimab trials in celiac.
Cytokines and Extraintestinal Disease
Because tissue-transglutaminase is expressed systemically, cytokine-driven inflammation occurs not just in the gut but wherever anti-tTG antibodies deposit. The inflammatory cytokine milieu drives:
- Bone resorption (IFN-γ, IL-18) → osteoporosis-celiac
- Liver inflammation → celiac-hepatitis
- Nerve damage → peripheral-neuropathy-celiac
Cytokines as Drug Targets
The cytokine network in celiac is increasingly studied as a therapeutic target — particularly for patients who don't respond to a gluten-free-diet:
- IL-15 blockade: AMG 714
- JAK inhibitors: block intracellular signalling downstream of multiple cytokines simultaneously; studied in RCD
Related Concepts
il-15 | cd4-t-cells | intraepithelial-lymphocytes | villous-atrophy | tissue-transglutaminase | refractory-celiac | il-15-inhibitors