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International Immunology, Vol. 12, No. 4, 425-430, April 2000
© 2000 Japanese Society for Immunology

The peripheral CD8 T cell repertoire is largely independent of the presence of intestinal flora

Philippe Bousso, Fabrice Lemaître, Dhafer Laouini, Jean Kanellopoulos and Philippe Kourilsky

Unité de Biologie Moléculaire du Gène, INSERM U277, Institut Pasteur, 25 rue du Dr Roux, 75015 Paris, France

Correspondence to: P. Bousso

While numerous studies have analyzed the shaping of T cell repertoires by self or foreign peptides, little is known on the influence of commensal self peptides derived from the intestinal flora (IF). Here, we have analyzed naive and immune repertoires in mice devoid of IF [germ-free (GF) mice]. First, by means of an extensive CDR3ß sequencing strategy, we show that the naive peripheral CD8 T cell repertoire does not exhibit a major imprint of IF antigens. Second, using MHC–peptide tetramers, CDR3ß length distribution analyses and TCR sequencing, we show that cytotoxic T lymphocyte (CTL) responses specific for two distinct epitopes are quasi-identical in normal and GF mice. Our findings indicate that, in general, peptides derived from the intestinal microflora have little if any influence on CTL responses in the mouse.

Keywords: cytotoxic T lymphocyte, germ-free mice, intestinal flora, MHC–peptide tetramers, TCR

Transmitting editor: A. Fischer


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