Host-pathogen Interactions of Clinical Isolates to Induce Infective Endocarditis

Overview

Journal Virulence

Specialty Microbiology

Date 2021 Sep 7

PMID 34490828

Citations 7

Authors

Christian Schwarz

Yasemin Tore

Vanessa Hoesker

Sabine Ameling

Katja Grun

Uwe Volker

P Christian Schulze

Marcus Franz

Cornelius Faber

Frieder Schaumburg

Silke Niemann

Verena Hoerr

Affiliations

Soon will be listed here.

Abstract

To evaluate potential pathomechanisms in the induction of infective endocarditis (IE), 34 () isolates, collected from patients with endocarditis and from healthy individuals were investigated both and isolates were tested for their cytotoxicity, invasion and the association with platelets. Virulence factor expression profiles and cellular response were additionally investigated and tested for correlation with the ability of to induce vegetations on the aortic valves . In an animal model of IE valvular conspicuity was assessed by magnetic resonance imaging at 9.4 T, histology and enrichment gene expression analysis. All isolates tested caused a reliable infection and inflammation of the aortic valves, but could not be differentiated and categorized according to the measured virulence profiles and cytotoxicity. Results from assays did not correlate with the severity of IE. However, the isolates differed substantially in the activation and inhibition of pathways connected to the extracellular matrix and inflammatory response. Thus, comprehensive approaches of host-pathogen interactions and corresponding immune pathways are needed for the evaluation of the pathogenic capacity of bacteria. An improved understanding of the interaction between virulence factors and immune response in infective endocarditis would offer novel possibilities for the development of therapeutic strategies and specific diagnostic imaging markers.

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