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. 1996 Apr 16;93(8):3613–3618. doi: 10.1073/pnas.93.8.3613

Interleukin 2 (IL-2) and interleukin 7 (IL-7) reciprocally induce IL-7 and IL-2 receptors on gamma delta T-cell receptor-positive intraepithelial lymphocytes.

K Fujihashi 1, S Kawabata 1, T Hiroi 1, M Yamamoto 1, J R McGhee 1, S Nishikawa 1, H Kiyono 1
PMCID: PMC39659  PMID: 8622984

Abstract

In this study, we describe the interaction between cytokine and cytokine receptor (R) for the activation and proliferation of gamma delta T-cell receptor-positive T cells (gamma delta T cells). gamma delta T cells isolated from murine intestinal intraepithelial lymphocytes (IELs) were separated into gamma delta (Dim) and gamma delta (Bright) fractions according to the intensity of gamma delta T-cell receptor expression. The gamma delta T cells express low levels of IL-2R and IL-7R as shown by flow cytometry and reverse transcriptase-PCR analysis, whereas gamma delta (Bright) T cells did not express either receptor. Our study also revealed that recombinant marine (rm)IL-2 and rmIL-7 reciprocally induced high expressions of IL-7R and IL-2R, respectively, on gamma delta (Dim) T cells but not on gamma delta (Bright) cells. Thus, treatment of gamma delta (Dim) T cells with rmIL-2 and rmIL-7 resulted in high proliferative responses, whereas gamma delta (Bright) T cells did not respond to these two cytokines. The sources of these two cytokines for gamma delta T cells were neighboring epithelial cells (IL-7) and alpha beta T cells (IL-2 and IL-7). Cytokine signaling by IL-2 and IL-7 from alpha beta T cells and epithelial cells was necessary for the expression of IL-7R and IL-2R, respectively, on a subset of gamma delta T cells (e.g., gamma delta (Dim) T cells) in mucosa-associated tissue for subsequent activation and cell division.

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Selected References

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