Related Experiment Videos
Antigen-specific and polyclonal CD4+ lamina propria T-cell lines: phenotypic and functional characterization
G R Harriman1, E Hörnqvist, N Y Lycke
1Mucosal Immunity Section, NIAID, NIH, Bethesda, MD.
Immunology
|January 1, 1992
Summary
Researchers characterized lamina propria CD4+ T cells and established methods for generating antigen-specific and polyclonal cell lines. These T-cell lines exhibit distinct cytokine profiles, offering insights into gut immunity.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Lamina propria CD4+ T cells are crucial immune components in the gut lining.
- Understanding their phenotype and function is key to deciphering gut immune responses.
- Existing knowledge on generating long-term lamina propria CD4+ T-cell lines is limited.
Purpose of the Study:
- To evaluate the surface phenotype and function of lamina propria CD4+ T cells.
- To establish methods for generating and characterizing antigen-specific and polyclonal lamina propria CD4+ T-cell lines in vitro.
- To compare the cytokine production profiles of these distinct T-cell lines.
Main Methods:
- Isolation and characterization of lamina propria CD4+ T cells from animals.
- Generation of antigen-specific T-cell lines via oral immunization with keyhole limpet hemocyanin (KLH) and cholera toxin.
- Generation of polyclonal T-cell lines using anti-CD3 stimulation.
- Flow cytometry for phenotype analysis (Thy-1, alpha beta TCR, CD8).
- Cytokine production assays (IL-2, IL-4, IL-5, gamma interferon) following stimulation.
Main Results:
- Lamina propria CD4+ T cells constitute ~30% of lamina propria lymphocytes and respond to mitogens, albeit less than spleen T cells.
- Freshly isolated cells produce significant IL-2, IL-4, and gamma interferon.
- Antigen-specific T-cell lines predominantly produce IL-2, IL-4, and gamma interferon upon stimulation.
- Polyclonal T-cell lines predominantly produce IL-4 and IL-5, with minimal IL-2 and no detectable gamma interferon.
Conclusions:
- Lamina propria CD4+ T cells exhibit distinct functional characteristics compared to splenic T cells.
- Successful in vitro generation protocols for both antigen-specific and polyclonal lamina propria CD4+ T-cell lines have been established.
- The distinct cytokine profiles of these cell lines provide valuable insights into T-cell responses within the gut lamina propria.