[Morphometric and electron microscopic study of the small intestine following total orthotopical auto- and allotransplantation].

Total orthotopic autotransplantation of the small intestine was performed in 22 dogs, allotransplantation--in 13 dogs. Changes in the wall of the graft resulted from the effect of both nonspecific (ischaemia, blockage of lymph outflow, denervation) and specific factors connected with the reaction of tissue incompatibility. Changes caused by the nonspecific factors are demonstrated as lymphostasis, edema of the wall in the graft, atrophy of the villi with epithelial flattening, hyperplasy of the intestinal gland, macrophagal and plasmocytic reaction in the mucous lamina propria, drop in villous-cryptic coefficient and reduction of the absorbing surface of the villi. At autotransplantation, structural-functional changes in the intestine undergo three stages: the stage of acute morphological changes and pronounced functional disturbances (up to 1,5 months); the stage of relative structural stabilization and gradual functional restoration (up to 6 months); the stage of atrophic-hyperplastic changes in the wall and decrease in functional activity of the intestinal graft (followed-up for 15 months). At allotransplantation, depending on the degree of cellular reaction and vascular changes, as well as on the localization of the process in the wall of the graft, a "graft versus host" reaction and a "recipient versus graft" reaction is demonstrated. Peculiar rosettes of plasmocytes have been described as a possible index of the reaction "graft versus host".