Abstract
Background
Although specific IgE antibodies reactive to exogenous antigens are found in patients with atopic dermatitis (AD), some patients do not have such antibodies. Autoimmunity has been proposed as a possible mechanism in these patients.
Objectives
To identify specific IgE antibodies reactive to human transglutaminase 3 (TG3) and tropomysin (TMP) and determine whether auto-reactive T cells are induced by these proteins in patients with AD.
Materials & Methods
Forty-two patients with AD and 27 healthy controls were included in this study. IgE antibodies against recombinant human TG3 and TMP were measured by ELISA. Cross-reactivity between allergens was determined by EdU of peripheral blood mononuclear cells (PBMCs) proliferation assays. T-cell lines were generated from PBMCs in the presence of house dust mites (HDM), TG3 and TMP. TG3/TP-specific T-cell clones were generated from T-cell lines, and were characterized by antigen specificity and cytokine pattern.
Results
In 12 patients with anti-HDM IgE antibodies, six (50%) had anti-TG3 IgE antibody and four (33.3%) had both anti-TG3 and anti-TMP IgE antibodies. Lymphocyte proliferation was induced in 12 patients by TG3 or TMP. T-cell lines and T-cell clones from PBMCs of patients with AD who had IgE antibody reactive to HDM were fully cross-reactive with TG3 and TMP. These cell clones included both Th1 cell (producing IFN-γ) and Th2 cell (inducing IL-4) responses. TG3-and TMP-specific T-cell clones were not generated from healthy controls.
Conclusion
Specific IgE antibody and T cell clones reactive to human TG3 and TMP were found in patients with AD, indicating that an autoimmune mechanism might contribute to AD.
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Acknowledgements and disclosures
Acknowledgements: we thank Dr. Yan Zhao, Dr. Ping Liu for their help in patient recruitment and sample collection. We also thank Professor Weidong Yu and Miss Zhu Teng for their technical assistance. This work was supported by China National Natural Foundation 81472879.
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Sun, J., Gu, Y., Li, K. et al. Co-existence of specific IgE antibodies and T cells reactive to house dust mites and human transglutaminase3/tropomysin in patients with atopic dermatitis. Eur J Dermatol 31, 155–160 (2021). https://doi.org/10.1684/ejd.2021.4018
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DOI: https://doi.org/10.1684/ejd.2021.4018