Mature cd4 single positive thymocytes in human thymoma: T cells may differentiate in the thymic epithelial cell tumor

Masayoshi Inoue, Yoshitaka Fujii, Meinoshin Okumura, Yukiyasu Takeuchi, Hiroyuki Shiono, Shinichiro Miyoshi, Hikaru Matsuda, Ryota Shirakura

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Abstract

Human thymoma, which is occasionally associated with autoimmune disease, is a thymic epithelial cell tumor and often contains a large number of lymphocytes. In a previous study, we have shown that a proportion of CD4 single positive T cells in human thymomas lack CD3, suggesting immaturity. In this study, we focused on the rest of the CD4 single positive T cells in thymomas that expressed CD3/TcRαβ and investigated the maturity of single positive T cells by analyzing lymphocyte surface antigens and the cells’ proliferative response to a mitogen. CD4 single positive cells that expressed CD3 or TcRαβ also expressed CD69 and had probably undergone positive selection in the tumor. Further, isolated CD4 or CD8 single positive cells from the thymomas responsed to a mitogen although at lower levels than the corresponding single positive cells in the peripheral blood. These results indicate that thymomas contain single positive T cells which have mature phenotype and proliferative ability, and suggest that T cells may differentiate in thymoma.

Original languageEnglish
Pages (from-to)216-222
Number of pages7
JournalPathobiology
Volume65
Issue number4
DOIs
Publication statusPublished - Jan 1 1997

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Keywords

  • CD3
  • CD69
  • Human T cell
  • Positive selection
  • TcRαβ
  • Thymoma

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Molecular Biology
  • Cell Biology

Cite this

Inoue, M., Fujii, Y., Okumura, M., Takeuchi, Y., Shiono, H., Miyoshi, S., Matsuda, H., & Shirakura, R. (1997). Mature cd4 single positive thymocytes in human thymoma: T cells may differentiate in the thymic epithelial cell tumor. Pathobiology, 65(4), 216-222. https://doi.org/10.1159/000164126