title: Circulating endothelial progenitor cells in patients with unstable angina: association with systemic inflammation.
abstract: BACKGROUND
  Endothelial progenitor cells (EPC) are present in peripheral blood and can develop a functional endothelial phenotype. The number and function of circulating EPCs are altered in atherosclerosis, diabetes, and after myocardial infarction and EPCs have been shown to promote postnatal angiogenesis and vasculogenesis. We investigated the number and adhesive properties of EPCs from patients with unstable angina and no evidence of cardiac necrosis.
  
  
  RESULTS
  Patients were selected with unstable angina (n=29) and no evidence of cardiac necrosis, and controls with stable angina (n=12) and atherosclerotic risk factors, medication use, and coronary vessel involvement similar to patients. Circulating EPC numbers were determined by colony-forming unit assay and their adhesive properties were evaluated by EPC capacity to bind immobilised fibronectin. High-sensitivity C-reactive protein (hsCRP) was determined in all patients. Circulating EPCs were significantly increased in patients with unstable as compared with stable angina (24.5+/-2.6 vs. 13.3+/-2.9, respectively). Seven unstable angina patients followed up for 3 months after clinical stabilisation exhibited a reduction of close to 50% in circulating EPC numbers. The adhesive capacity of EPCs from patients with unstable and stable angina did not differ. A positive correlation was found between systemic CRP levels and circulating EPC numbers, but not their adhesive capacity.
  
  
  CONCLUSIONS
  Patients with unstable angina and no evidence of cardiac necrosis exhibited increased circulating EPCs. Systemic inflammation, in addition to recognised growth factors, could play a role in the peripheral mobilisation of EPCs in patients with anginal syndromes.
authors.affiliation: The Department of Cardiology and the Haematology Institute, Tel Aviv Sourasky Medical Center and The Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel. jacobg@post.tau.ac.il
authors.forename: Jacob
authors.initials: J
authors.lastname: George
authors.forename: Emil
authors.initials: E
authors.lastname: Goldstein
authors.forename: Soulico
authors.initials: S
authors.lastname: Abashidze
authors.forename: Varda
authors.initials: V
authors.lastname: Deutsch
authors.forename: Haim
authors.initials: H
authors.lastname: Shmilovich
authors.forename: Ariel
authors.initials: A
authors.lastname: Finkelstein
authors.forename: Itzhak
authors.initials: I
authors.lastname: Herz
authors.forename: Hylton
authors.initials: H
authors.lastname: Miller
authors.forename: Gad
authors.initials: G
authors.lastname: Keren
mesh_terms: D000789:Angina, Unstable / Q000097:blood / Q000473:pathology*; D002448:Cell Adhesion / Q000502:physiology; D042783:Endothelial Cells / Q000473:pathology*; D004730:Endothelium, Vascular / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013234:Stem Cells / Q000473:pathology*; D042461:Vascular Endothelial Growth Factor A / Q000097:blood; D014657:Vasculitis / Q000473:pathology*
chemical_list: D042461:Vascular Endothelial Growth Factor A