Participation of blood born cells in rat Masugi nephritis.

Participation of blood born cells in rat Masugi nephritis was investigated with ultrastructural demonstration of peroxidase, in addition to conventional light and electron microscopies. Polymorphonuclear leukocytes appear immediately and transiently after injection of nephrotoxic serum. Hypercellularity in the early stage of the disease is consisted mainly of monocyte-macrophage. Proteinuria and infiltration of few monocytes are persistent through the course up to 124 days and focal sclerosis with hyaline material appears in the later stage.