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Intracellular survival of Clostridium chauvoei in bovine macrophages.
Veterinary Microbiology 2017 Februrary
Clostridium chauvoei is the etiological agent of blackleg, a severe disease of domestic ruminants, causing myonecrosis and serious toxemia with high mortality. Despite the known importance of this agent, studies evaluating its pathogenesis of blackleg are scarce, and many are based on an unproven hypothesis that states that macrophages are responsible for carrying C. chauvoei spores from the intestines to muscles in the early stages of blackleg. Therefore, the present study aimed to investigate the survival of C. chauvoei vegetative cells or spores after phagocytosis by a murine macrophage cell line (RAW 264.7) and bovine monocyte-derived macrophages and to profile inflammatory and anti-inflammatory cytokine transcripts of bovine macrophages infected with C. chauvoei vegetative cells or spores. Both vegetative cells and spores of C. chauvoei remain viable after internalization by murine and bovine macrophages. Bovine macrophages infected with vegetative cells showed a pro-inflammatory profile, while those infected with spores displayed an anti-inflammatory profile. Together, these results corroborate the classical hypothesis that macrophages may play a role in the early pathogenesis of blackleg. Moreover, this is the first study to evaluate the infection kinetics and cytokine profile of bovine monocyte-derived macrophages infected with a Clostridium species.
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