Abstract
Amplification of L3T4-/Ly-2-(CD 4-/CD 8-) T cells following in vivo administration of anti-L3T4 monoclonal antibody was examined in the spleen of mice by flow cytometry and immunohistochemistry. BALB/c mice were given 4-7 weekly injections of either anti-L3T4 (1 mg/week) or phosphate-buffered saline (control group), and dispersed spleen cells and tissue sections analyzed for the presence of Thy-1.2+, L3T4+, or Ly-2+ cells, and for the absence of both L3T4 and Ly-2 on Thy-1.2+ cells. Prior to treatment, L3T4+ and Ly-2+ cells accounted for virtually all Thy-1.2+ cells in approximately a 2:1 ratio. Following anti-L3T4 treatment, L3T4+ cells were depleted, and Ly-2+ cells accounted for about 2/3 of the Thy-1.2+ cells. A population of L3T4-/Ly-2- T cells was generated that accounted for 20-30% of the Thy-1.2+ cells, accounted for most of the Thy-1.2+ cells in red pulp, and was also present among the predominant Ly-2+ cells in periarteriolar sheaths.
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