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Intra-epithelial lymphocytes: interferon-gamma production and suppressor/cytotoxic activities

E C Ebert1

  • 1Department of Medicine, UMDNJ-Robert Wood Johnson Medical School, New Brunswick 08903-0019.

Clinical and Experimental Immunology
|October 1, 1990
PubMed

Insights

Human intraepithelial lymphocytes (IEL) show limited proliferation but produce significant interleukin-2 (IL-2). Adding sheep erythrocytes enhances T cell functions and interferon-gamma (IFN-gamma) production in IEL.

Area of Science:

  • Immunology
  • Cellular Biology

Background:

  • Human intraepithelial lymphocytes (IEL) play a crucial role in mucosal immunity.
  • IEL exhibit distinct functional characteristics compared to peripheral blood lymphocytes (PBL).

Purpose of the Study:

  • To investigate the interferon-gamma (IFN-gamma) production of IEL.
  • To assess the suppressor and cytotoxic activities of IEL.
  • To determine the effect of sheep erythrocytes on IEL function.

Main Methods:

  • Activation of IEL and PBL with phytohaemagglutinin (PHA) and concanavalin A (Con A).
  • Quantification of interleukin-2 (IL-2) and IFN-gamma production.
  • Assays for suppressor and cytotoxic activities, including mitogen-induced cellular cytotoxicity and lymphokine-activated killer (LAK) cell activity.
  • Evaluation of the impact of sheep erythrocyte addition during stimulation.

Main Results:

  • PHA-activated IEL produced IFN-gamma comparable to PHA-activated CD8+ PBL.
  • Con A-activated IEL exhibited less suppressor activity than Con A-activated CD8+ PBL.
  • IEL displayed lower mitogen-induced cellular cytotoxicity and LAK activity than CD8+ PBL.
  • Sheep erythrocyte lysates enhanced IEL proliferation and lymphokine production but not suppressor or cytotoxic activities.

Conclusions:

  • IEL possess distinct functional capabilities, including IFN-gamma production.
  • IEL show reduced suppressor and cytotoxic functions compared to PBL.
  • Sheep erythrocytes can modulate IEL proliferation and lymphokine production, suggesting a role in immune responses.

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