Cytotoxic differentiation of mouse gut thymodependent and independent intraepithelial T lymphocytes is induced locally. Correlation between functional assays, presence of perforin and granzyme transcripts, and cytoplasmic granules

doi:10.1084/jem.173.6.1549

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Cytotoxic differentiation of mouse gut thymodependent and independent intraepithelial T lymphocytes is induced locally. Correlation between functional assays, presence of perforin and granzyme transcripts, and cytoplasmic granules

D Guy-Grand, M Malassis-Seris, C Briottet and P Vassalli
INSERM U.132, Hopital Necker-Enfants Malades, Paris, France.

Mouse gut intraepithelial lymphocytes (IEL), whether thymodependent (CD4+ or CD8 alpha/beta +; TCR-alpha/beta +) or thymoindependent (CD8 alpha/alpha +; TCR-alpha/beta + or -gamma/delta +), all display cytotoxic activity in a "redirected lysis assay" using anti-CD3 or anti- TCR beta or delta chains secreting hybridomas as targets; this is also observed with IEL of germ-free mice, indicating that this activity, which is absent in peripheral T lymphocytes, does not require stimulation by bacterial antigens. Perforin and granzyme transcripts are detectable in unselected gut IEL, in contrast to normal T lymphocytes of peripheral lymphoid organs. Cytological labeling (with [3H]DFP) of IEL smears reveals labeled granules (i.e., containing serine-esterases, presumably granzymes) in all subsets of gut IEL. This indicates that the gut micro-environment has an inductive role on the cytotoxic differentiation of lymphocytes of various origins when they reach the gut wall to become IEL.
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