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Potential involvement of Streptococcus mutans possessing collagen binding protein Cnm in infective endocarditis.


ABSTRACT: Streptococcus mutans, a significant contributor to dental caries, is occasionally isolated from the blood of patients with infective endocarditis. We previously showed that S. mutans strains expressing collagen-binding protein (Cnm) are present in the oral cavity of approximately 10-20% of humans and that they can effectively invade human umbilical vein endothelial cells (HUVECs). Here, we investigated the potential molecular mechanisms of HUVEC invasion by Cnm-positive S. mutans. The ability of Cnm-positive S. mutans to invade HUVECs was significantly increased by the presence of serum, purified type IV collagen, and fibrinogen (p < 0.001). Microarray analyses of HUVECs infected by Cnm-positive or -negative S. mutans strains identified several transcripts that were differentially upregulated during invasion, including those encoding the small G protein regulatory proteins ARHGEF38 and ARHGAP9. Upregulation of these proteins occurred during invasion only in the presence of serum. Knockdown of ARHGEF38 strongly reduced HUVEC invasion by Cnm-positive S. mutans. In a rat model of infective endocarditis, cardiac endothelial cell damage was more prominent following infection with a Cnm-positive strain compared with a Cnm-negative strain. These results suggest that the type IV collagen-Cnm-ARHGEF38 pathway may play a crucial role in the pathogenesis of infective endocarditis.

SUBMITTER: Nomura R 

PROVIDER: S-EPMC7645802 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Potential involvement of Streptococcus mutans possessing collagen binding protein Cnm in infective endocarditis.

Nomura Ryota R   Otsugu Masatoshi M   Hamada Masakazu M   Matayoshi Saaya S   Teramoto Noboru N   Iwashita Naoki N   Naka Shuhei S   Matsumoto-Nakano Michiyo M   Nakano Kazuhiko K  

Scientific reports 20201105 1


Streptococcus mutans, a significant contributor to dental caries, is occasionally isolated from the blood of patients with infective endocarditis. We previously showed that S. mutans strains expressing collagen-binding protein (Cnm) are present in the oral cavity of approximately 10-20% of humans and that they can effectively invade human umbilical vein endothelial cells (HUVECs). Here, we investigated the potential molecular mechanisms of HUVEC invasion by Cnm-positive S. mutans. The ability of  ...[more]

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