A study of the interaction between Helicobacter pylori and components of the human fibrinolytic system

A. Yarzábal, L. Avilán, K. Hoelzl, M. de Muñoz, J. Puig, I. Kansau

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The interaction of plasminogen, tissue plasminogen activator (t-PA) and urokinase with a clinical strain of Helicobacter pylori was studied. Plasminogen bound to the surface of H. pylori cells in a concentration-dependent manner and could be activated to the enzymatic form, plasmin, by t-PA. Affinity chromatography assays revealed a plasminogen-binding protein of 58.9 kDa in water extracts of surface proteins. Surface-associated plasmin activity, detected with the chromogenic substrate CBS 00.65, was observed only when plasminogen and an exogenous activator were added to the cell suspension. The two physiologic plasminogen activators, t-PA and urokinase, were also shown to bind to and remain active on the surface of bacterial cells. epsilon-Aminocaproic acid caused partial inhibition of t-PA binding, suggesting that the kringle 2 structure of this activator is involved in the interaction with surface receptors. The activation of plasminogen by t-PA, but not urokinase, strongly depended on the presence of cells and a 25-fold enhancer effect on the initial velocity of activation by t-PA compared to urokinase was established. Furthermore, a relationship between cell concentration and the initial velocity of activation was demonstrated. These findings support the concept that plasminogen activation by t-PA on the bacterial surface is a surface-dependent reaction which offers catalytic advantages.

    Original languageEnglish
    Pages (from-to)1015-1021
    Number of pages7
    JournalBrazilian Journal of Medical and Biological Research
    Volume33
    Issue number9
    DOIs
    Publication statusPublished - Sept 2000

    Keywords

    • Aminocaproates/metabolism
    • Chromatography
    • Electrophoresis, Polyacrylamide Gel
    • Fibrinolytic Agents/metabolism
    • Helicobacter pylori/metabolism
    • Humans
    • Indicators and Reagents
    • Plasminogen Activators/metabolism
    • Receptors, Cell Surface/metabolism
    • Tissue Plasminogen Activator/metabolism
    • Urokinase-Type Plasminogen Activator/metabolism

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