title: Surface protease of Treponema denticola hydrolyzes C3 and influences function of polymorphonuclear leukocytes.
abstract: Treponema denticola is a dominant microorganism in human periodontal lesions. One of the major virulence factors of this microorganism is its chymotrypsin-like surface protease, dentilisin. The purpose of this study was to evaluate the effect of dentilisin on human polymorphonuclear leukocytes (PMNs). We used chemiluminescence to assess production of O(-)(2) by PMNs against T. denticola ATCC 35405 and dentilisin-deficient mutant K1. T. denticola ATCC 35405 induced production of O(-)(2), whereas dentilisin-deficient K1 did not. We found that chymostatin, a protease inhibitor, strongly reduced the ability of T. denticola ATCC 35405 to induce production of, O(-)(2), whereas K1 was relatively unaffected. We also used Immunoblot and ELISA to evaluate the activation of complement by this microorganism in relation to PMNs. T. denticola ATCC 35405 hydrolyzed the alpha-chain of C3, producing iC3b. Furthermore, strain ATCC 35405 induced a larger release of MMP-9 from PMNs than strain K1. Dentilisin activated PMNs via complement pathways and may play a role in establishing periodontal lesions.
authors.affiliation: Department of Periodontics, Tokyo Dental College, 1-2-2 Masago, Chiba, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Yamazaki
authors.forename: Meguru
authors.initials: M
authors.lastname: Miyamoto
authors.forename: Satoru
authors.initials: S
authors.lastname: Yamada
authors.forename: Katsuji
authors.initials: K
authors.lastname: Okuda
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Ishihara
mesh_terms: D001426:Bacterial Proteins; D002478:Cells, Cultured; D002918:Chymotrypsin / Q000502:physiology*; D003176:Complement C3 / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D017353:Gene Deletion; D006801:Humans; D015151:Immunoblotting; D008163:Luminescent Measurements; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D018375:Neutrophil Activation; D009504:Neutrophils / Q000276:immunology* / Q000378:metabolism; D009842:Oligopeptides / Q000494:pharmacology; D010447:Peptide Hydrolases; D010587:Phagocytosis; D011480:Protease Inhibitors / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism; D048373:Treponema denticola / Q000201:enzymology* / Q000235:genetics; D037521:Virulence Factors / Q000502:physiology
chemical_list: D001426:Bacterial Proteins; D003176:Complement C3; D009842:Oligopeptides; D011480:Protease Inhibitors; D037521:Virulence Factors; D013481:Superoxides; C002101:chymostatin; D010447:Peptide Hydrolases; C102570:dentilisin; D002918:Chymotrypsin; D020780:Matrix Metalloproteinase 9