Interleukin 4-producing CD4+ T cells in the skin of cats with allergic dermatitis
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Updated: Aug 8, 2026
Imaging CD4 T Cell Interstitial Migration in the Inflamed Dermis
Published on: March 25, 2016
P J Roosje1, G A Dean, T Willemse
1Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine, Utrecht University, The Netherlands.
Insights
Feline allergic dermatitis involves interleukin 4 (IL4) producing CD4+ T cells, similar to human atopic dermatitis. This indicates IL4
Area of Science:
- Veterinary Immunology
- Dermatology
- Immunopathology
Background:
- Feline allergic dermatitis shares similarities with human atopic dermatitis, including cellular infiltrates and CD4/CD8 T cell ratios.
- CD4+ helper T cells, particularly the Th2 subset, are crucial in human atopic dermatitis pathogenesis.
- The role of specific cytokine production by T cells in feline allergic dermatitis remains largely unexplored.
Purpose of the Study:
- To investigate the cytokine profile of CD4+ T cells in cats with allergic dermatitis.
- To determine the presence and source of interleukin 4 (IL4) production in feline skin lesions.
- To compare the immunological findings in cats with those observed in human atopic dermatitis.
Main Methods:
- Immunohistochemistry was employed to detect IL4-producing CD4+ T cells in lesional and nonlesional skin biopsies.
- Double staining techniques were used to identify cell types (pan-T, CD4, mast cell chymase) expressing IL4.
- Western blotting confirmed the cross-reactivity of antibodies against human IL4 with feline IL4.
Main Results:
- CD4+ T cells in both lesional and nonlesional skin of cats with allergic dermatitis were found to produce IL4.
- The number of IL4-producing T cells was significantly higher in affected cats compared to healthy controls (P = 0.001).
- IL4 was primarily localized to CD4+ T cells, with minimal co-localization with mast cells.
Conclusions:
- Interleukin 4 (IL4) is produced by CD4+ T cells in feline allergic dermatitis, mirroring findings in human atopic dermatitis.
- The presence of IL4 in clinically unaffected skin suggests its involvement in the early or ongoing pathogenesis of the disease.
- These findings highlight a potential therapeutic target for feline allergic dermatitis by modulating IL4 pathways.
Abstract:
Lesional skin of cats with allergic dermatitis has a cellular infiltrate and a CD4/CD8 ratio comparable to that in humans with atopic dermatitis. CD4+ helper T cells and in particular cells belonging to the Th2 subset play an important role in disease pathogenesis in humans. We investigated the cytokine pattern of CD4+ T cells in situ, with special emphasis on the putative presence of cells producing interleukin 4 (IL4), in cats with allergic dermatitis. Immunohistochemical procedures were used to determine that CD4+ T cells in lesional and nonlesional skin of cats with allergic dermatitis can produce IL4, as occurs in humans. Lesional and nonlesional skin of cats with allergic dermatitis had significantly more IL4+ T cells (P = 0.001) than did skin of healthy control cats. Double staining indicated that all IL4+ cells were positive for pan-T or CD4 markers. Double labeling for mast cell chymase and IL4 stained primarily different cells. Western blotting demonstrated cross-reactivity between the antibody against human IL4 and a feline recombinant IL4. These results indicate that IL4 is primarily produced by CD4+ T cells and is also present in clinically uninvolved skin, indicating a role in the pathogenesis of allergic dermatitis in cats.
