Volume 10, Issue 5, Pages (November 2011)

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Volume 10, Issue 5, Pages 423-425 (November 2011) Porphyromonas gingivalis Sinks Teeth into the Oral Microbiota and Periodontal Disease  Kenya Honda  Cell Host & Microbe  Volume 10, Issue 5, Pages 423-425 (November 2011) DOI: 10.1016/j.chom.2011.10.008 Copyright © 2011 Elsevier Inc. Terms and Conditions

Figure 1 Keystone Species-like Activity of P. gingivalis in Periodontitis (A) Pathogenic bacteria usually induce severe inflammation and outgrow other indigenous bacteria. (B) In contrast, P. gingivalis colonizes at low levels and acts as a “keystone.” P. gingivalis expresses gingipain, which functions as a C5 convertase-like enzyme and generates high levels of C5a locally for C5aR activation. This C5aR signaling triggers inflammation but inhibits the killing capacity of leukocytes as well. In addition, P. gingivalis suppresses the expression of chemokines (not depicted). Therefore, P. gingivalis provides the biofilm with a nutrient-rich, gingival inflammatory exudate and promotes its own survival and the growth of other bacteria. As a result, the colonization of P. gingivalis dramatically alters the composition of the oral microbiota and induces persistent inflammation for bone resorption. Cell Host & Microbe 2011 10, 423-425DOI: (10.1016/j.chom.2011.10.008) Copyright © 2011 Elsevier Inc. Terms and Conditions