CD4+ and CD8+ cytotoxic T lymphocytes may induce mesenchymal cell apoptosis in IgG4-related disease

Cory A. Perugino, Naoki Kaneko, Takashi Maehara, Hamid Mattoo, Jesper Kers, Hugues Allard-Chamard, Vinay S. Mahajan, Hang Liu, Emanuel Della-Torre, Samuel J.H. Murphy, Musie Ghebremichael, Zachary S. Wallace, Marcy B. Bolster, Liam M. Harvey, Geetha Mylvaganam, Yesim Tuncay, Lloyd Liang, Sydney B. Montesi, Xiuwei Zhang, Akira TinjuKeita Mochizuki, Ryusuke Munemura, Mizuki Sakamoto, Masafumi Moriyama, Seiji Nakamura, Nir Yosef, John H. Stone, Shiv Pillai

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Background: IgG4-related disease (IgG4-RD) is an immune-mediated fibrotic disorder that has been linked to CD4+ cytotoxic T lymphocytes (CD4+CTLs). The effector phenotype of CD4+CTLs and the relevance of both CD8+ cytotoxic T lymphocytes (CD8+CTLs) and apoptotic cell death remain undefined in IgG4-RD. Objective: We sought to define CD4+CTL heterogeneity, characterize the CD8+CTL response in the blood and in lesions, and determine whether enhanced apoptosis may contribute to the pathogenesis of IgG4-RD. Methods: Blood analyses were undertaken using flow cytometry, cell sorting, transcriptomic analyses at the population and single-cell levels, and next-generation sequencing for the TCR repertoire. Tissues were interrogated using multicolor immunofluorescence. Results were correlated with clinical data. Results: We establish that among circulating CD4+CTLs in IgG4-RD, CD27loCD28loCD57hi cells are the dominant effector subset, exhibit marked clonal expansion, and differentially express genes relevant to cytotoxicity, activation, and enhanced metabolism. We also observed prominent infiltration of granzyme A–expressing CD8+CTLs in disease tissues and clonal expansion in the blood of effector/memory CD8+ T cells with an activated and cytotoxic phenotype. Tissue studies revealed an abundance of cells undergoing apoptotic cell death disproportionately involving nonimmune, nonendothelial cells of mesenchymal origin. Apoptotic cells showed significant upregulation of HLA-DR. Conclusions: CD4+CTLs and CD8+CTLs may induce apoptotic cell death in tissues of patients with IgG4-RD with preferential targeting of nonendothelial, nonimmune cells of mesenchymal origin.

Original languageEnglish
Pages (from-to)368-382
Number of pages15
JournalJournal of Allergy and Clinical Immunology
Issue number1
Publication statusPublished - Jan 2021

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology


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