The effect of cyclophosphamide on the Peyer's patches in MRL1/1 and NZB/WF1 mice.

MRL1/1 & NZB/WF1 female mice were treated with high-dose cyclophosphamide (20 mg/kg/week), and the distribution of T cells in the Peyer's patches was examined in treated and untreated mice. A multiple layering technique was used for immunohistochemical detection of the lymphocyte surface antigens of T cells (Thy1.2, L3T4, Lyt2). High-dose cyclophosphamide inhibited the increase of the T cell population of MRL1/1 female mice with age, but little change was observed NZB/WF1 female mice.