title: Presence of bone-marrow- and neural-crest-derived cells in intimal hyperplasia at the time of clinical in-stent restenosis.
abstract: OBJECTIVE
  Intralesional data of coronary target lesions following stent implantation are infrequent. In addition, there is ongoing controversy on the origin of neointimal cells. In this respect, several lines of evidence revealed bone-marrow-derived endothelial progenitor and dendritic cells (DCs) as well as neural-crest-derived cells (NCCs) to contribute to atherosclerosis. Therefore, the objective of the present study was to assess cellularity, cell type and origin of neointimal cells in in-stent restenosis (ISR).
  
  
  METHODS
  Atherectomy specimens from 17 patients with coronary in-stent restenosis (n=10; time post-stenting 5+/-3 months) and with peripheral in-stent restenosis (n=7; 7+/-3 months) versus those from 10 patients with primary lesions were immunohistochemically examined for the presence of the determinants CD34, AC133, S100, glial fibrillary acidic protein (GFAP), neuron-specific enolase (NSE), nerve growth factor receptor (NGFR) and alpha-smooth muscle actin followed by computer-assisted morphometry.
  
  
  RESULTS
  In-stent restenosis probes consistently demonstrated homogeneous hypercellularity (942+/-318 cells/mm(2)) compared to de novo lesions (347+/-120 cells/mm(2), P<0.001). alpha-smooth muscle actin positive cells occupied 67% of intimal cells in in-stent restenosis. As a key finding, expression of endothelial progenitor cells (CD34: 7.1+/-2.5% positive/total cells vs. 0.6+/-0.7%, P<0.001; AC133: 7.0+/-3.4% vs. 1.0+/-0.7%, P<0.001), dendritic cells (S100: 9.8+/-5.6% vs. 1.4+/-1.1%, P<0.001) and neural-crest-derived cells (GFAP: 7.9+/-2.4% vs. 3.1+/-1.0%; NSE: 4.4+/-2.6% vs. 1.3+/-1.6%; NGFR: 4.2+/-2.5% vs. 1.1+/-0.7%; each P<0.001) was significantly increased in in-stent restenosis compared to primary lesions.
  
  
  CONCLUSIONS
  Bone-marrow- and neural-crest-derived cells, the most dendritic cells, are consistently present in in-stent restenosis, whereas alpha-smooth muscle actin positive cells constitute the largest intimal cell pool. Our data suggest the recruitment of primarily extravascular cells within neointima formation in human in-stent restenosis.
authors.affiliation: Department of Cardiology, Heart Center University of Bonn, Sigmund-Freud-Str. 25, 53105 Bonn, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Skowasch
authors.forename: Alexander
authors.initials: A
authors.lastname: Jabs
authors.forename: René
authors.initials: R
authors.lastname: Andrié
authors.forename: Sabine
authors.initials: S
authors.lastname: Dinkelbach
authors.forename: Berndt
authors.initials: B
authors.lastname: Lüderitz
authors.forename: Gerhard
authors.initials: G
authors.lastname: Bauriedel
mesh_terms: D000071916:AC133 Antigen; D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D015703:Antigens, CD; D018952:Antigens, CD34 / Q000032:analysis; D015415:Biomarkers / Q000032:analysis; D001854:Bone Marrow Cells / Q000473:pathology*; D016009:Chi-Square Distribution; D023903:Coronary Restenosis / Q000473:pathology*; D023921:Coronary Stenosis / Q000473:pathology / Q000628:therapy; D005260:Female; D006023:Glycoproteins / Q000032:analysis; D006801:Humans; D006965:Hyperplasia; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D008875:Middle Aged; D009432:Neural Crest / Q000473:pathology*; D010455:Peptides / Q000032:analysis; D010751:Phosphopyruvate Hydratase / Q000032:analysis; D017475:Receptors, Nerve Growth Factor / Q000032:analysis; D018709:Statistics, Nonparametric; D015607:Stents; D017539:Tunica Intima / Q000473:pathology*
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D018952:Antigens, CD34; D015415:Biomarkers; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; D017475:Receptors, Nerve Growth Factor; D010751:Phosphopyruvate Hydratase