title: The mobilization of CD34 positive mononuclear cells after myocardial infarction is abolished by revascularization of the culprit vessel.
abstract: BACKGROUND
  The mobilization of hematopoietic progenitor cells from bone marrow has been proposed to play a role in cardiac regeneration after myocardial infarction (MI). Accordingly, an increase in CD34 positive cells (CD34+) has been observed in the peripheral blood of patients after acute myocardial infarction. Here, we evaluated the influence of an acute percutaneous coronary intervention (PCI) of the occluded artery on the mobilization of CD34+ in acute MI.
  
  
  METHODS
  CD34 positive cells were quantified by flow cytometry (FACS analysis) and expressed as number per million white blood cells. Peripheral blood was obtained and analyzed at day 5 after the onset of symptoms from patients with acute MI without early PCI (n=11, age 63+/-5 years), acute MI with rapid PCI (n=7, age 63+/-3), patients with pneumonia (n=5, age 51+/-6), patients without angiographical signs of coronary artery disease (control, n=5, age 66+/-8) and young healthy volunteers (n=11, age 28+/-1).
  
  
  RESULTS
  Patients with MI but without PCI had a higher CD34+ count at day 5 (312+/-48 per 10(6) leukocytes) than control (156+/-40, P=0.03) and MI with PCI (173+/-31, P=0.03). No increase in CD34+ was observed in patients who underwent PCI vs. control. Patients with pneumonia had higher CD34+ (350+/-44) than patients with MI with PCI (P=0.01) and control (P=0.01). Healthy individuals who were much younger than all other groups (28+/-1 years, P<0.0001 vs. all groups) had the highest CD34+ (526+/-51, P=0.006 vs. MI without PCI, P=0.00003 vs. MI with PCI, P=0.02 vs. pneumonia, P=0.00006 vs. control).
  
  
  CONCLUSIONS
  Shorter time of ischemia and reduced cell death may be the reasons for reduced CD34+ cell count after acute MI with early percutaneous intervention vs. acute MI without intervention. Besides ischemia, also inflammation as present in pneumonia may cause a mobilization of CD34+ cells. Age may be a major factor that influences the mobilization of CD34+ cells and the regenerative capacity of the heart.
authors.affiliation: Laboratory of Muscle Research and Molecular Cardiology, Department of Internal Medicine III, University of Cologne, Joseph-Stelzmann-Str. 24, 50924 Köln, Germany. muller.ehmsen@uni-koeln.de
authors.forename: Jochen
authors.initials: J
authors.lastname: Müller-Ehmsen
authors.forename: Christof
authors.initials: C
authors.lastname: Scheid
authors.forename: Franziska
authors.initials: F
authors.lastname: Grundmann
authors.forename: Ingo
authors.initials: I
authors.lastname: Hirsch
authors.forename: Gökmen
authors.initials: G
authors.lastname: Turan
authors.forename: Paschalis
authors.initials: P
authors.lastname: Tossios
authors.forename: Uwe
authors.initials: U
authors.lastname: Mehlhorn
authors.forename: Robert H G
authors.initials: RH
authors.lastname: Schwinger
mesh_terms: D018952:Antigens, CD34 / Q000097:blood*; D018450:Disease Progression; D005260:Female; D005434:Flow Cytometry; D019650:Hematopoietic Stem Cell Mobilization; D006801:Humans; D007958:Leukocyte Count; D007963:Leukocytes, Mononuclear / Q000166:cytology / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000601:surgery; D009204:Myocardial Revascularization; D013997:Time Factors
chemical_list: D018952:Antigens, CD34