Nitric oxide and immune response in infection control of Caseous Lymphadenitis

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Abstract

This study aimed to evaluate aspects of host immune response using an experimental infection model of Corynebacterium pseudotuberculosis (CP) in C57/Black6 wild-type and knockout for nitric oxide (KONO) mice. 28 mice were evaluated: 4 wild-type controls; 10 wild-type infected with CP; 4 KO-NO controls; 10 KO-NO infected with CP. Infection procedures were carried out by intraperitoneal inoculation using 107. Infected C57/Black6 KO-NO mice began to die after the 5° day post-inoculation, up until the 14° day. Neutrophils were found in increased numbers in the infiltrate of KO-NO murine peritoneal cavities. Examination of splenic tissue revealed an accumulation of lymphocytes, predominantly CD8 T-cells, in experimental animal groups. KO-NO animals were found to have a predominance of granulomas 7 days post-inoculation, primarily in the lymph nodes. In addition, greater amounts of bacteria were recovered from the mesenteric lymph nodes of KO-NO mice. There was no statistically significant difference in the levels of total IgG and its subclasses 14 days post-inoculation between KO-NO and wild groups. The results suggest the importance of nitric oxide in the process of controlling CP infection, as KO-NO animals were observed to be markedly more affected by infection with this bacterium.

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APA

Neto, M. G. O., Santos, H. A., Fraga, R. E., Pacheco, A. S., Sampaio, G. P., Moura-Costa, L. F., … Vale, V. L. C. (2017). Nitric oxide and immune response in infection control of Caseous Lymphadenitis. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia, 69(6), 1565–1572. https://doi.org/10.1590/1678-4162-9023

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