Gingipains from Porphyromonas gingivalis W83 synergistically disrupt endothelial cell adhesion and can induce caspase-independent apoptosis.
We have shown previously that gingipains from Porphyromonas gingivalis W83 can induce cell detachment, cell adhesion molecule (CAM) cleavage, and apoptosis in endothelial cells; however, the specific roles of the individual gingipains are unclear. Using purified gingipains, we determined that each of the gingipains can cleave CAMs to varying degrees with differing kinetics. Kgp and HRgpA work together to quickly detach endothelial cells. Interestingly, in the absence of active caspases, both gingipain-active W83 extracts and purified HRgpA and RgpB induce apoptotic morphology, suggesting that the gingipains can induce both caspase-dependent and caspase-independent apoptosis. Using z-VAD-FMK to inhibit Kgp activity and leupeptin to inhibit Rgp activity in gingipain-active W83 extracts, we investigated the relative significance of the synergistic role of the gingipains. z-VAD-FMK or leupeptin delayed, but did not inhibit, cell detachment induced by gingipain-active W83 extracts or purified gingipains. There was partial cleavage of N-cadherin and cleavage of VE-cadherin was not inhibited. Degradation of integrin beta1 was inhibited only in the presence of z-VAD-FMK. These results further clarify the role P. gingivalis plays in tissue destruction occurring in the periodontal pocket.
Sheets
Shaun M
SM
Department of Biochemistry and Microbiology, School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA. ssheets04b@llu.edu
Potempa
Jan
J
Travis
James
J
Fletcher
Hansel M
HM
Casiano
Carlos A
CA
D018829:Adhesins, Bacterial / Q000187:drug effects / Q000302:isolation & purification / Q000494:pharmacology*; D000590:Amino Acid Chloromethyl Ketones / Q000494:pharmacology; D000818:Animals; D017209:Apoptosis; D061945:Caspase Inhibitors; D020169:Caspases / Q000737:chemistry / Q000378:metabolism; D002417:Cattle; D002448:Cell Adhesion / Q000187:drug effects*; D015815:Cell Adhesion Molecules / Q000378:metabolism*; D002478:Cells, Cultured; D003546:Cysteine Endopeptidases / Q000187:drug effects / Q000302:isolation & purification / Q000494:pharmacology*; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D042783:Endothelial Cells / Q000187:drug effects* / Q000201:enzymology; D000080867:Gingipain Cysteine Endopeptidases; D016966:Porphyromonas gingivalis / Q000201:enzymology* / Q000472:pathogenicity
D018829:Adhesins, Bacterial; D000590:Amino Acid Chloromethyl Ketones; D061945:Caspase Inhibitors; D015815:Cell Adhesion Molecules; D015853:Cysteine Proteinase Inhibitors; D000080867:Gingipain Cysteine Endopeptidases; C096713:benzyloxycarbonylvalyl-alanyl-aspartyl fluoromethyl ketone; D020169:Caspases; D003546:Cysteine Endopeptidases