IL-33 Increases the Magnitude of the Tissue-Resident Memory T Cell Response in Intestinal Tissues during Local...

Area of Science:

• Immunology
• Microbiology
• T cell biology

Background:

• Interleukin-33 (IL-33) is crucial for early CD8 T cell programming.
• The role of IL-33 in generating tissue-resident memory T cells in vivo is not well understood.

Purpose of the Study:

• To investigate the role of IL-33 signaling in the differentiation and maintenance of tissue-resident memory T cells in the intestine.
• To determine the impact of IL-33/ST2 axis on T cell responses during Yersinia pseudotuberculosis infection.

Main Methods:

• Infection of mice with Yersinia pseudotuberculosis.
• Analysis of IL-33 and ST2 expression in intestinal tissues and T cells.
• Blocking IL-33 signaling and overexpression of ST2 on T cells.

Main Results:

• IL-33 expression increased in the intestine post-infection, coinciding with ST2 expression on infiltrating T cells.
• Blocking IL-33 signaling did not significantly alter the number or phenotype of generated tissue-resident memory T cells.
• ST2 overexpression on T cells increased TCF1 expression and T cell numbers in the intestine, though these effects were transient.

Conclusions:

• IL-33 signaling promotes T cell accumulation and commitment to intestinal tissue residency during infection.
• While not essential for initial memory T cell generation, IL-33 influences T cell numbers and residency in the gut.