Expression of dual Nucleotides/Cysteinyl-Leukotrienes Receptor GPR17 in early trafficking of cardiac stromal cells after myocardial infarction

Simona Cosentino, Laura Castiglioni, Francesca Colazzo, Elena Nobili, Elena Tremoli, Patrizia Rosa, Maria P. Abbracchio, Luigi Sironi, Maurizio Pesce

Research output: Contribution to journalArticle

Abstract

GPR17 is a Gi-coupled dual receptor activated by uracil-nucleotides and cysteinyl-leukotrienes. These mediators are massively released into hypoxic tissues. In the normal heart, GPR17 expression has been reported. By contrast, its role in myocardial ischaemia has not yet been assessed. In the present report, the expression of GPR17 was investigated in mice before and at early stages after myocardial infarction by using immunofluorescence, flow cytometry and RT-PCR. Before induction of ischaemia, results indicated the presence of the receptor in a population of stromal cells expressing the stem-cell antigen-1 (Sca-1). At early stages after ligation of the coronary artery, the receptor was expressed in Sca-1+ cells, and cells stained with Isolectin-B4 and anti-CD45 antibody. GPR17+ cells also expressed mesenchymal marker CD44. GPR17 function was investigated in vitro in a Sca-1+/CD31- cell line derived from normal hearts. These experiments showed a migratory function of the receptor by treatment with UDP-glucose and leukotriene LTD4, two GPR17 pharmacological agonists. The GPR17 function was finally assessed in vivo by treating infarcted mice with Cangrelor, a pharmacological receptor antagonist, which, at least in part, inhibited early recruitment of GPR17+ and CD45+ cells. These findings suggest a regulation of heart-resident mesenchymal cells and blood-borne cellular species recruitment following myocardial infarction, orchestrated by GPR17.

Original languageEnglish
Pages (from-to)1785-1796
Number of pages12
JournalJournal of Cellular and Molecular Medicine
Volume18
Issue number9
DOIs
Publication statusPublished - Sep 1 2014

Keywords

  • Cardiac stromal cell
  • Cysteinyl-Leukotrienes
  • GPR17
  • Myocardial ischaemia
  • Myofibroblasts

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Medicine

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