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• W2466144410 abstract "Periodontitis, a chronic inflammation driven by dysbiotic subgingival bacterial flora, is linked on clinical levels to the development of a number of systemic diseases and to the development of oral and gastric tract tumors. A key pathogen, Porphyromonas gingivalis, secretes gingipains, cysteine proteases implicated as the main factors in the development of periodontitis. Here we hypothesize that gingipains may be linked to systemic pathologies through the deregulation of kallikrein-like proteinase (KLK) family members. KLKs are implicated in cancer development and are clinically utilized as tumor progression markers. In tissues, KLK activity is strictly controlled by a limited number of tissue-specific inhibitors, including SPINK6, an inhibitor of these proteases in skin and oral epithelium. Here we identify gingipains as the only P. gingivalis proteases responsible for SPINK6 degradation. We further show that gingipains, even at low nanomolar concentrations, cleaved SPINK6 in concentration- and time-dependent manner. The proteolysis was accompanied by loss of inhibition against KLK13. We also mapped the cleavage by Arg-specific gingipains to the reactive site loop of the SPINK6 inhibitor. Moreover, we identified a significant fraction of SPINK6-sensitive proteases in healthy saliva and confirmed the ability of gingipains to inactivate SPINK6 under ex vivo conditions. Finally, we demonstrate the double-edge action of gingipains, which, in addition, can activate KLKs because of gingipain K-mediated proteolytic processing of the zymogenic proform of KLK13. Altogether, the results indicate the potential of P. gingivalis to disrupt the control system of KLKs, providing a possible mechanistic link between periodontal disease and tumor development." @default.
• W2466144410 created "2016-07-22" @default.
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• W2466144410 date "2016-09-01" @default.
• W2466144410 modified "2023-10-16" @default.
• W2466144410 title "Gingipains of Porphyromonas gingivalis Affect the Stability and Function of Serine Protease Inhibitor of Kazal-type 6 (SPINK6), a Tissue Inhibitor of Human Kallikreins" @default.
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• W2466144410 doi "https://doi.org/10.1074/jbc.m116.722942" @default.
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