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Leukaemia of novel gastrointestinal T-lymphocyte population infected with HTLV-I

T Hattori1, N Asou, H Suzushima

  • 1Second Department of Internal Medicine, Kumamoto University Medical School, Japan.

Lancet (London, England)
|January 12, 1991
PubMed

Insights

A study found a rare T-cell subset in the gastrointestinal tract of an adult man with leukemia. This double-negative T-cell receptor alpha beta subset may be targeted by Human T-lymphotropic virus type I (HTLV-I) infection.

Area of Science:

  • Immunology
  • Gastroenterology
  • Oncology

Background:

  • Adult T-cell leukemia/lymphoma (ATL) is associated with Human T-lymphotropic virus type I (HTLV-I).
  • Gastrointestinal involvement is common in ATL, but the specific immune cells targeted are not fully understood.

Observation:

  • A 72-year-old man presented with watery diarrhea and leukocytosis.
  • Endoscopic biopsies of the gastrointestinal tract revealed abnormal cell proliferation.

Findings:

  • Flow cytometry identified a monoclonal expansion of "double-negative" (CD4-, CD8-) T-cells expressing T-cell receptor (TCR) alpha beta.
  • Southern blotting confirmed monoclonal integration of HTLV-I in these cells.

Implications:

  • This study identifies a novel T-cell subset (double-negative TCR alpha beta) in the gastrointestinal tract.
  • This subset may represent a specific target for HTLV-I infection in the gut, contributing to gastrointestinal symptoms in adult man.
  • Further research into this T-cell subset could lead to new diagnostic or therapeutic strategies for HTLV-I-related diseases.

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