Experimental autotransplant of spleen / Autotransplante experimental de baço

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The spleen is a lymphoid organ that plays important part in the organism defense, participating in filtration processes, phagocytosis and immunoglobulin production. Histologically, is formed by a stroma and the parenquima being its cellular arrangement differentiated in white and red pulps. The main cellular types in the splenic structure are: T and B lymphocytes, macrophages, plasmocytes, fibrocytes, reticulocytes and dendritic cells. The patients victims of spleen traumatisms and splenectomized assume an asplenia state and consequently they acquire a larger susceptibility to the sepses, which can be quickly progressive and fatal. Thus, it has appeared therapeutic options after the splenectomies, using techniques of conservative surgery (conservative treatment, partial splenectomies and splenorrhaphies with or without application of haemostatics agents), as well as techniques of splenic autotransplantation. The objectives of the research were to evaluate macro and microscopically the late evolution of the fragments of spleen autotransplanted in the greater omentum, mesenterium and peritoneal cavity, after 24 weeks of observation. To perform the experimental study, were employed fifty two Wistar rats, males and adults, submitted to total splenectomy and divided in four groups. The group (control) I was formed by eight animals chosen aleatorily among the three groups studied. The group II - seventeen animals with implant of spleen fragment in the peritoneal cavity; group III - eighteen animals with implant in the omentum and group IV - seventeen animals with implant fixed in mesenterium root. In the histological analysis were adopted qualitative and quantitative criteria, with the counting of no cellular e cellular elements. The results showed adherences to the adjacent tissues and vascularization in all of the fragments transplanted. The group II presented white pulp and preserved vascularization. The group III showed white pulp with follicular formations and lymphoid tissue preserved, and the red pulp in cordon aspect and hemorrhagic. The group IV presented depletion of white and red pulp, while others evidenced better preservation of the pulps. The counting of lymphocytes revealed significant difference between the groups I and II and the group I and IV (p <0.05). The counting of active macrophages revealed significant difference between the groups III and IV (p <0.05) and similarity between I and III (p >0.05). The other elements: active macrophages phagocyting hemosiderine, plasmocytes, fibroblasts, fibrocytes, giant cells, monocytes, interstitial spaces and fibers of collagen, did not show significant difference among the groups. The splenic autransplantation is feasible, being the better place the greater omentum. This research demonstrated through qualitative and quantitative histological analysis that the splenic tissue autotransplanted in the omentum of Wistar rats preserves its function of defense of the organisms

ASSUNTO(S)

esplenectomia spleen transplantation rato como animal de laboratorio rats as laboratory animals autologous transplante autologo splenectomy baço

ACESSO AO ARTIGO

Documentos Relacionados