title: Endothelial progenitor cells in sudden sensorineural hearing loss.
abstract: CONCLUSIONS
  Endothelial progenitor cells (EPCs) are a unique subtype of circulating cells with properties similar to those of embryonal angioblasts. They have the potential to proliferate and to differentiate into mature endothelial cells. EPCs are reduced in patients with vascular risk factors due to a decreased mobilization, an increased consumption at the site of damage or a reduced half-life. The results of this study confirm the existence of an endothelial dysfunction in patients with sudden sensorineural hearing loss (SSHL) and support the vascular involvement in the pathogenesis of the disease.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the concentration of EPCs in patients affected by SSHL.
  
  
  METHODS
  Twenty-one patients affected by SSHL were evaluated. The number of EPCs was analyzed by flow cytometry analysis of peripheral blood CD34+KDR+CD133+ cells.
  
  
  RESULTS
  Circulating levels of EPCs were significantly lower in SSHL patients compared with controls. In particular, CD34+KDR+ cells and CD34+CD133+KDR+ cells were significantly reduced (p < 0.05).
authors.affiliation: Otolaryngology Clinic "G. Lugli", Otology and Neurotologic Surgery, Department of Biomedical Sciences and Human Oncology, University of Bari, Italy. nicola.quaranta@orl.uniba.it
authors.forename: Nicola
authors.initials: N
authors.lastname: Quaranta
authors.forename: Alfonso
authors.initials: A
authors.lastname: Ramunni
authors.forename: Concetta
authors.initials: C
authors.lastname: De Luca
authors.forename: Paola
authors.initials: P
authors.lastname: Brescia
authors.forename: Porzia
authors.initials: P
authors.lastname: Dambra
authors.forename: Giacomina
authors.initials: G
authors.lastname: De Tullio
authors.forename: Angelo
authors.initials: A
authors.lastname: Vacca
authors.forename: Antonio
authors.initials: A
authors.lastname: Quaranta
mesh_terms: D000328:Adult; D053687:Adult Stem Cells / Q000166:cytology*; D000368:Aged; D002452:Cell Count; D005260:Female; D005434:Flow Cytometry; D006319:Hearing Loss, Sensorineural / Q000097:blood*; D003639:Hearing Loss, Sudden / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged