Glucagon-like peptide-1 receptor expression after myocardial infarction: Imaging study using (68)Ga-NODAGA-exendin-4 positron emission tomography.
Autor: Ståhle, Mia; Kytö, Ville; Kiugel, Max; Liljenbäck, Heidi; Metsälä, Olli; Käkelä, Meeri; Li, Xiang-Guo; Oikonen, Vesa; Saukko, Pekka; Nuutila, Pirjo; Knuuti, Juhani; Roivainen, Anne; Saraste, Antti
Publication year: 2020
Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology
issn:1532-6551 1071-3581
doi: 10.1007/s12350-018-01547-1
Abstract:
BACKGROUND: Activation of glucagon-like peptide-1 receptor (GLP-1R) signaling protects against cardiac dysfunction and remodeling after myocardial infarction (MI). The aim of the study was to evaluate (68)Ga-NODAGA-exendin-4 positron emission tomography (PET) for assessment of GLP-1R expression after MI in rats. METHODS AND RESULTS: Rats were studied at 3 days, 1 and 12 weeks after permanent coronary ligation or a sham-operation. Rats were injected with (68)Ga-NODAGA-exendin-4 and scanned with PET and contrast-enhanced computed tomography (CT) followed by digital autoradiography and histology of left ventricle tissue sections. (68)Ga-NODAGA-exendin-4 PET/CT showed focally increased tracer uptake in the infarcted regions peaking at 3 days and continuing at 1 week after MI. Pre-treatment with an unlabeled exendin-4 peptide significantly reduced (68)Ga-NODAGA-exendin-4 uptake. By autoradiography, (68)Ga-NODAGA-exendin-4 uptake was 8.6-fold higher in the infarcted region and slightly increased also in the remote, non-infarcted myocardium at 1 week and 12 weeks post-MI compared with sham. Uptake of (68)Ga-NODAGA-exendin-4 correlated with the amount of CD68-positive macrophages in the infarcted area and alpha-smooth muscle actin staining in the remote myocardium. CONCLUSIONS: (68)Ga-NODAGA-exendin-4 PET detects up-regulation of cardiac GLP-1R expression during healing of MI in rats and may provide information on the activated repair mechanisms after ischemic myocardial injury.
Language: eng
Rights:
Pmid: 30547299
Tags: Male; Animals; inflammation; Rats; Rats, Sprague-Dawley; Echocardiography; Macrophages/metabolism; Kinetics; Signal Transduction; PET; Gene Expression Profiling; Positron Emission Tomography Computed Tomography/*methods; Acetates/*chemistry; Exenatide/*chemistry; Gallium Radioisotopes/*chemistry; Glucagon-like peptide-1 receptor; Glucagon-Like Peptide-1 Receptor/*chemistry; Heart Ventricles/diagnostic imaging/pathology; Heterocyclic Compounds, 1-Ring/*chemistry; myocardial infarction; Myocardial Infarction/*diagnostic imaging; Tomography/*methods
Link: https://pubmed.ncbi.nlm.nih.gov/30547299/
