Comparative study on the immunosuppressive and lympholytic activity of optical isomers of cyclophosphamide

The influence of chirality of cyclophosphamide (Cy) on the reactivity of lymphoid cells in vivo was studied in Balb/c mice. It has been shown that (+) Cy inhibits the formation of direct PFC in Balb/c mice more effectively than (-) Cy. The augmentation of DTH--reaction against HuRBC in mice, measured by the foot-pad test and the elongation of graft survival time were noted when racemic or (-) Cy were applied. Investigated forms of Cy decreased the number of nucleated cells in mice spleens, but lympholytic effect of (+) Cy was lower than that of racemic and (-) Cy. The possible consequences of stereo-differentiated immunosuppressive activity of enantiomeric forms of cyclophosphamide in the experimental procedures and the therapy of "autoimmune" and malignant diseases are considered.