12 research outputs found

    project report Promise2007

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    Das Projekt Promise2007 befasste sich mit der Erstellung und Auswertung einer Statistik zur Mitgliedersituation im Berufsverband Medizinischer Informatiker e.V.. Mit dem Ziel mehr über die Mitglieder und ihre derzeitige Situation zu erfahren wurde das Projekt an der Fachhochschule Hannover initiiert. Statistisch erfasst wurden Fragen zum Beschäftigungsverhältnis, zu Aus- und Weiterbildung, der beruflichen Situation und persönliche Angaben. Die Ergebnisse wurden ausgewertet und daraus wichtige Erkenntnisse für den BVMI e.V. abgeleitet, welche auf die weitere Verbandsarbeit Einfluss nehmen

    Elafin is specifically inactivated by RgpB from Porphyromonas gingivalis by distinct proteolytic cleavage

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    Porphyromonas gingivalis, the major causative bacterium of periodontitis, contributes significantly to elevated proteolytic activity at periodontal pockets due to the presence of both, bacteria and host, predominantly neutrophil-derived, serine proteases. Normally the activity of the latter enzymes is tightly regulated by endogenous proteins, including elafin, a potent neutrophil elastase and proteinase 3 inhibitor released from epithelial cells at site of inflammation. Here we have found that all three gingipains (HRgpA, RgpB and Kgp) were able to degrade elafin but RgpB was far more efficient than other gingipains. RgpB already inactivated efficiently the inhibitory activity of elafin at subnanomolar concentrations through a proteolysis limited to the Arg22-Cys23 peptide bond within the surface loop harbouring the inhibitor active site. Notably, elafin resisted inactivation by several Staphylococcus aureus-derived serine- and cysteine proteases confirming this protein's high stability for proteolytic degradation. Therefore, we concluded that elafin inactivation by RgpB represents a specific pathogenic adaptation of P. gingivalis to disturb the protease-protease inhibitor balance in the infected gingival tissue. This contributes to enhanced degradation of host proteins and generation of a pool of peptides serving as nutrients for this asaccharolytic pathogen
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