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Treatment of mice with anti-L3T4, a monoclonal antibody directed against helper T-cells, impairs clearance of intestinal Giardia muris infection. The present study examined the effect of anti-L3T4 treatment on mouse Peyer's patch cytoarchitecture and on the distribution of T-cell subsets within microenvironments of the follicle. Female BALB/c mice, aged 8 weeks, were given 4-7 weekly injections of either anti-L3T4 (1 mg/wk) or PBS (control group), and Peyer's patches were examined by immunohistochemistry or flow cytometry. In anti-L3T4-treated mice, Peyer's patch follicles (B-cell areas) were about two thirds the size of follicles in controls, and virtually all the size difference occurred in germinal centers. Peyer's patches were depleted of L3T4+ cells, yet the proportion of Thy-1.2+ (all T) cells was not decreased correspondingly, and the distribution of Thy-1.2+ cells in the patches was similar to that in control mice. In anti-L3T4-treated mice, Thy-1.2+ cells consisted of (a) Ly-2+ (cytotoxic/suppressor T) cells, and (b) a population of Thy-1.2+ cells that were neither L3T4+ nor Ly-2+. After treatment, Ly-2+ cells accounted for most of the T-cells in interfollicular areas and were also scattered in follicles, in germinal centers, and below the dome epithelium--in areas where L3T4+ cells predominated in control mice. Thy-1.2+ cells that were L3T4- and Ly-2- were mainly localized below the dome epithelium. These shifts indicate complex interrelationships among different lymphocyte subsets in Peyer's patches.

Modulation of lymphocyte subsets in Peyer's patches of mice treated with monoclonal antibody against helper T-cells.