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Anti-CD3- or PHA-induced cytotoxicity in human intraepithelial and lamina propria lymphocytes

J Rüthlein1, G Heinze

  • 1Medizinische Universitätsklinik, Immunologisches Labor, Würzburg, BRD.

Immunologic Research
|January 1, 1991
PubMed

Insights

Cytotoxic cells are important in human mucosa. While lymphocytes in the lamina propria (LPL) show cytotoxicity, intraepithelial lymphocytes (IEL) do not, regardless of disease status.

Area of Science:

  • Immunology
  • Gastroenterology

Background:

  • Morphological and functional data suggest cytotoxic cells are significant in human mucosal tissues.
  • Previous studies indicated human intraepithelial lymphocytes (IEL) lack spontaneous cytotoxicity, while lamina propria lymphocytes (LPL) exhibit anti-CD3-mediated cytotoxicity.

Purpose of the Study:

  • To investigate and confirm the cytotoxic functions of human intraepithelial lymphocytes (IEL) and lamina propria lymphocytes (LPL).
  • To compare cytotoxic activity between patients with colon cancer and inflammatory bowel disease.

Main Methods:

  • Functional assays were used to assess cell-mediated cytotoxicity.
  • Short-term assays were employed to evaluate IEL cytotoxic function.
  • Cytotoxicity of LPL was examined using anti-CD3 and PHA stimulation.

Main Results:

  • The study confirmed that most individuals exhibit anti-CD3 or PHA-mediated cytotoxicity in LPL.
  • No significant cytotoxic function was detected in IEL using short-term assays.
  • No differences in cytotoxic function were observed between patients with colon cancer and inflammatory bowel disease.

Conclusions:

  • Human lamina propria lymphocytes (LPL) possess cytotoxic capabilities, while intraepithelial lymphocytes (IEL) do not demonstrate this in short-term assessments.
  • Cytotoxic cell activity in the human mucosa does not differ between patients with colon cancer and inflammatory bowel disease.

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