Abstract:
:The periodontopathic bacterium Actinobacillus actinomycetemcomitans has been implicated in the pathogenesis of periodontal diseases. It has been reported previously that infection with the organism induced apoptosis in the mouse macrophage cell line J774.1. In the present study, the role of caspases during apoptosis in A. actinomycetemcomitans-infected J774.1 cells was examined. A large number of apoptotic cells was detected by flow cytometric analysis in infected J774.1 cells; however, inhibitors of caspase-9, -6 and -3/7 completely blocked the induction of apoptosis. Expression of the cleaved forms of caspase-6 and -7 was detected during apoptosis in infected J774.1 cells. Immunoblot analysis revealed that the caspase-9 inhibitor blocked expression of the cleaved forms of caspase-6 and -7, whilst the caspase-3 inhibitor blocked expression of the cleaved form of caspase-7, but not caspase-6. It is known that lamin A/C and poly(ADP-ribose) polymerase (PARP) are essential nuclear components for maintaining normal cell function and viability, and both were found to be cleaved in the infected J774.1 cells. Immunoblot analysis also revealed that the caspase-6 inhibitor blocked the cleavage of lamin A/C, whilst the caspase-3/7 inhibitor blocked the cleavage of PARP. Taken together, these results suggest that activation of caspases and the subsequent cleavage of lamin A/C and PARP are involved in the morphological changes of apoptotic macrophages infected with A. actinomycetemcomitans.
journal_name
J Med Microbioljournal_title
Journal of medical microbiologyauthors
Okinaga T,Kasai H,Tsujisawa T,Nishihara Tdoi
10.1099/jmm.0.47193-0subject
Has Abstractpub_date
2007-10-01 00:00:00pages
1399-1404issue
Pt 10eissn
0022-2615issn
1473-5644journal_volume
56pub_type
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