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Both Th1 and Th2 CD4 + T-Cell Lineage Infiltrations Decrease in Post-hematopoietic Stem Cell Transplantation Colon

Yasuo Matsubara1,2, Yasunori Ota3, Tamami Denda3

  • 1Department of Oncology and General Medicine, Institute of Medical Science, IMSUT Hospital, The University of Tokyo, 4-6-1 Shirokanedai, Minato-Ku, Tokyo, 108-8639, Japan. ma-yasu@ims.u-tokyo.ac.jp.

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Allogeneic hematopoietic stem cell transplantation (HSCT) survivors show increased colon cancer risk. Impaired T-cell function, not cell count, in colon adenomas may drive this secondary cancer development.

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CD4+ helper T cellsColon adenomasHematopoietic stem cell transplantationTumor microenvironment

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Area of Science:

  • Immunology
  • Oncology
  • Transplantation Medicine

Background:

  • Long-term survival after allogeneic hematopoietic stem cell transplantation (HSCT) is increasing.
  • This improved survival is associated with a higher risk of secondary solid cancers, including colon cancer.
  • The underlying mechanisms of post-HSCT colon carcinogenesis are not fully understood.

Purpose of the Study:

  • To investigate the role of local immunity in colon carcinogenesis after HSCT.
  • To assess T-cell infiltration in colon adenomas, which are premalignant lesions.
  • To explore the relationship between T-cell subsets and colon cancer development in HSCT recipients.

Main Methods:

  • Colon adenoma samples were collected from 19 post-HSCT patients and 57 non-HSCT controls.
  • Immunohistochemistry was used to analyze infiltrating T cells.
  • Double staining evaluated CD4+/T-bet+ (Th1), CD4+/GATA3+ (Th2), CD4+/FoxP3+ (Treg) cells, and CD8+ T cells.

Main Results:

  • No significant differences were observed in the total numbers of CD4+ and CD8+ T cells between post-HSCT and non-HSCT adenomas.
  • A significant reduction in CD4+/T-bet+ (Th1) and CD4+/GATA3+ (Th2) T cells was found in post-HSCT adenomas compared to controls.
  • The counts of CD4+/FoxP3+ (Treg) cells did not differ significantly between the groups.

Conclusions:

  • While T-cell numbers recover post-HSCT, functional deficits in CD4+ T-cell activation and differentiation may contribute to colon carcinogenesis.
  • Understanding these immune dysfunctions is crucial for developing screening and prevention strategies for secondary colon cancer in HSCT patients.
  • Further research into T-cell pathogenesis can inform targeted interventions for HSCT survivors.