Periódicos Brasileiros em Medicina Veterinária e Zootecnia

Tissue apoptosis in mice infected with italic>Leptospira interrogans /italic> serovar Icterohaemorrhagiae

Marinho, MárciaVidovix Táparo, CileneS. Oliveira Júnior, ItamarHelena Venturoli Perri, SilviaCristina Cardoso, Tereza

title>Abstract /title> sec> title>Background: /title> p>This investigation aimed to evaluate the occurrence of some apoptotic features induced by italic>Leptospira interrogans /italic> serovar Icterohaemorrhagiae infection in young BALB/c mice during 2, 4, 7, 10, 14 and 21 days post-infection (dpi). /p> /sec> sec> title>Methods: /title> p>The animals were euthanized and lung, liver and kidneys were harvested to histopathology analysis and immunohistochemistry to caspase-3 antigen detection was performed. /p> /sec> sec> title>Results: /title> p>Chromatin condensation in kidney and liver tissues, but not in lung tissue, was observed. Caspase-3 reactive cells, mainly characterized as renal epithelial cells, were detected in the days 14 and 21 at high levels when compared to days 2,4 and 7 (p = 0.025; p 0.05). Lung sections revealed caspase-3 labeled alveolar cells in 10 and 14 days post-infection was higher than observed at 7 days (p = 0.0497; p 0.05). Liver sections demonstrated reactive cells at a highest level at 14 and 21 days post-infection when comparison to 2,4, 7 and 10 days (p = 0.0069; p 0.05). /p> /sec> sec> title>Conclusions: /title> p>Our results suggest that infection of L italic>interrogans /italic> induce in kidney, liver and lung an activation of apoptosis mediated by caspase-3 dependent pathway in later phases of infectious process. /p> /sec>

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