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We have compared the frequencies of T cells expressing each of four different T cell receptor (TCR) V beta segments in lamina propria and peripheral blood lymphocytes of 12 Crohn's disease (CD), six ulcerative colitis (UC), and 10 control patients in an attempt to identify disease-specific changes. The frequencies of CD4+ and CD8+ cells reacting with each of four fluoresceinated TCR-specific monoclonal antibodies directed against V beta 5, V beta 6.7a, V beta 8, and V beta 12 were determined by flow cytometry. There was no difference among the groups in the average frequency of any single V beta segment in either the CD4+ or CD8+ subpopulations. However, when the sum of the differences in V beta frequencies (delta score) between peripheral blood lymphocytes (PBL) and lamina propria lymphocytes (LPL) were determined for each individual, significant differences were observed between the CD4+ and CD8+ populations and among the patient groups. In all three patient groups, there were significant individual differences between LPL and PBL in the frequencies of CD8+ and CD4+ cells reacting with the four V beta-specific mAb. In Controls and UC, this difference was, on average, two-fold greater in CD8+ cells than in CD4+. In CD, however, this difference was, on average, the same for CD8+ and CD4+ cells. These observations suggest that (1) the human colonic LPL TCR repertoire is normally different from that of PBL, especially in the CD8+ population and (2) there is an alteration in the LPL TCR repertoire in CD which is not observed in Controls or UC.
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