Histologic and immunohistochemical evaluation of intestinal innervation in dogs with intussusceptions submitted to enterectomy

Author(s)

Leda Marques de Oliveira Barros

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD)
• Defense date: 2008-09-08

Examining board members

Julia Maria Matera; Angelo João Stopiglia; Antônio Felipe Paulino de Figueiredo Wouk

• Advisor: Julia Maria Matera

Abstract

The purpose of this study was to evaluate the preservation of the innervation of macroscopically viable bowel segments of dogs with intussusceptions. This group (G1) was compared to bowel segment of normal dogs (G2). Histological and immunohistochemical analysis were performed using computed system (Image Pro-Plus®). Late assessment of the quality of life and digestive function were also evaluated. Analyzed variables included: mean density of circular and longitudinal muscular layers cells, ratio between muscular layers, mean of myenteric plexuses, mean density of myenteric cells, neuronal degeneration degree in myenteric plexus, synaptophysin and NSE immunoreactivity and defecatory disorders. All tested parameters, except mean density of longitudinal muscular layers cells, ratio between muscular layers and synaptophysin immunoreactivity, showed statistical differences when group G1 was compared with group G2. Correlations between mean density of myenteric cells and mean density of circular muscular layers cells; neuronal degeneration degree in myenteric plexus and NSE immunoreactivity; neuronal degeneration degree in myenteric plexus and mean density of myenteric cells were observed. Regarding the immunohistochemical antibodies, NSE showed better staining pattern than synaptophysin. Three animals of G1 (n=13) died during the initial post-operative period. During the late post-operative period, three animals presented disorders in fecal consistency, frequency of defecation and acute intermittent diarrheal episodes. The follow-up time was 6 months. These findings showed that macroscopically viable bowel segments can present innervation damage eventually translated in clinical symptoms in the future. So, a careful evaluation of the preserved surgical margin during enterectomy and enteroanastomosis must be carried out as well as monitoring of the late digestive function. (AU)

• FAPESP's process: 06/01831-0 - Clinical, surgical and histological study of intestinal obstructions in dogs
• Grantee: Leda Marques de Oliveira Barros
• Support Opportunities: Scholarships in Brazil - Master