Inflammation in acute coronary syndrome: Expression of TLR2 mRNA is increased in platelets of patients with ACS

Autoři: Lukas Andreas Heger aff001;  Marcus Hortmann aff001;  Madlin Albrecht aff001;  Christian Colberg aff001;  Karlheinz Peter aff002;  Thilo Witsch aff001;  Daniela Stallmann aff001;  Andreas Zirlik aff001;  Christoph Bode aff001;  Daniel Duerschmied aff001;  Ingo Ahrens aff001
Působiště autorů: Department of Cardiology and Angiology I, Heart Center Freiburg University, Faculty of Medicine, University of Freiburg, Freiburg, Germany aff001;  Baker IDI Heart and Diabetes Institute, Melbourne, Australia aff002;  Department of Cardiology, Medical University of Graz, Graz, Austria aff003;  Department of Cardiology and Medical Intensive Care, Augustinerinnen Hospital, Academic Teaching Hospital University of Cologne, Cologne, Germany aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article



Platelets are key components in atherogenesis and determine the course of its clinical sequelae acute coronary syndrome (ACS). Components of the innate immune system—the superfamily of TLR receptors–are present in platelets and represent a link between atherothrombosis and inflammation. We hypothesize that alteration in platelet TLR mRNA expression is a result of inflammation driving coronary atherosclerosis and may represent an alternative platelet activation pathway in ACS.

TLR2-, TLR4- and TLR9- mRNA-expression was determined in ACS patients and compared to patients with invasive exclusion of atherosclerotic lesions of coronary arteries.


A total of fifty-four patients were enrolled in this clinical retrospective cohort single centre study. Total RNA from sepharose-filtered highly purified platelets was isolated using acid guanidinium thiocyanate-phenol-chloroform extraction and transcribed to cDNA using a first strand cDNA synthesis kit. To determine absolute copy numbers of TLR2, TLR4 and TLR9 we used plasmid based quantitative PCR with normalisation to an internal control.


We found that mRNA expression levels of TLR2 but not TLR 4 and 9 are up-regulated in platelets of patients with ACS when compared to patients without coronary atherosclerosis.


Our results suggest elevated TLR2 mRNA expression in platelets as a biomarker reflecting the underlying inflammation in ACS and possibly severity of coronary atherosclerosis. Platelet TLR2 may represent a link between inflammation and atherothrombosis in ACS.

Klíčová slova:

Coronary heart disease – Immune response – Inflammation – Messenger RNA – Platelet activation – Platelet aggregation – Platelets – Toll-like receptors


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