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The periodontal pathogen Porphyromonas gingivalis sensitises human blood platelets to epinephrine
Cardiovascular Inflammation Research Centre, Department of Clinical and Experimental Medicine, Division of Clinical Chemistry, Sweden; Deparment of Medical and Health Science, Division of Pharmacology, Linköping University, Sweden; Department of Clinical and Experimental Medicine, Division of Clinical Chemistry, University Hospital, Linköping, Sweden.
Cardiovascular Inflammation Research Centre, Department of Clinical and Experimental Medicine, Division of Clinical Chemistry, Sweden.
Deparment of Medical and Health Science, Division of Pharmacology, Linköping University, Sweden.
Deparment of Medical and Health Science, Division of Pharmacology, Linköping University, Sweden.
2008 (English)In: Platelets, ISSN 0953-7104, E-ISSN 1369-1635, Vol. 19, no 5, 352-358 p.Article in journal (Refereed) Published
Abstract [en]

Recent studies indicate connections between periodontitis and atherothrombosis, and the periodontal pathogen Porphyromonas gingivalis has been found within atherosclerotic lesions. P. gingivalis-derived proteases, designated gingipains activate human platelets, probably through a "thrombin-like" activity on protease-activated receptors (PARs). However, the potential interplay between P. gingivalis and other physiological platelet activators has not been investigated. The aim of this study was to elucidate consequences and mechanisms in the interaction between P. gingivalis and the stress hormone epinephrine. By measuring changes in light transmission through platelet suspensions, we found that P. gingivalis provoked aggregation, whereas epinephrine alone never had any effect. Intriguingly, pre-treatment of platelets with a low, sub-threshold number of P. gingivalis (i.e. a density that did not directly provoke platelet aggregation) resulted in a marked aggregation response when epinephrine was added. This synergistic action was not inhibited by the cyclooxygenas inhibitor aspirin. Furthermore, fura-2-measurements revealed that epinephrine caused an intracellular Ca(2+) mobilization in P. gingivalis pre-treated platelets, whereas epinephrine alone had no effect. Inhibition of the arg-specific gingipains, but not the lys-specific gingipains, abolished the aggregation and the Ca(2+) response provoked by epinephrine. Similar results were achieved by separate blockage of platelet alpha(2)-adrenergic receptors and PARs. In conclusion, the present study shows that a sub-threshold number of P. gingivalis sensitizes platelets to epinephrine. We suggest that P. gingivalis-derived arg-specific gingipains activates a small number of PARs on the surface of the platelets. This leads to an unexpected Ca(2+) mobilization and a marked aggregation response when epinephrine subsequently binds to the alpha(2)-adrenergic receptor. The present results are consistent with a direct connection between periodontitis and stress, and describe a novel mechanism that may contribute to pathological platelet activation.

Place, publisher, year, edition, pages
Informa Healthcare, 2008. Vol. 19, no 5, 352-358 p.
Keyword [en]
epinephrine; gingipain; PARs; platelets; Porphyromonas gingivalis
National Category
Hematology Cell and Molecular Biology
Identifiers
URN: urn:nbn:se:oru:diva-56665DOI: 10.1080/09537100802056102ISI: 000259197700006PubMedID: 18791941ScopusID: 2-s2.0-51849088127OAI: oai:DiVA.org:oru-56665DiVA: diva2:1083524
Funder
Swedish Research Council, K2007-64X-15060-04-3
Note

Funding Agencies:

County Council of Östergötland

University of Linköping

Available from: 2017-03-21 Created: 2017-03-21 Last updated: 2017-04-13Bibliographically approved

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