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Circulating hematopoietic and endothelial progenitor cells in newborn infants: Effects of gestational age, postnatal age and clinical stress in the first 3weeks of life.
MedLine Citation:
PMID:  23312395     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
INTRODUCTION: Circulating endothelial progenitor cells (EPC) are bone marrow derived progenitors that can be mobilized by erythropoietin or in response to tissue injury, and participate in vascular repair. EPC are understudied in human neonates. Whether EPC frequency in newborn infants may be influenced by gestational age or postnatal stress is unknown. METHODS: Blood samples were collected on day 1 of life and weekly for 3weeks from hospitalized neonates for plasma erythropoietin and flow cytometry analysis for CD34+, CD34+CD45-, CD34+VEGFR2+ and CD34+CD45-VEGFR2+ cells (EPC). Associations between CD34+ cell subsets and clinical parameters were studied. RESULTS: Forty five patients were enrolled. An inverse correlation with gestational age was observed for CD34+ and CD34+ VEGFR2+ cell frequencies in whole blood (WB) on day 1 (p<0.05). In preterm infants, CD34+ cell frequency decreased with increased postnatal age (p=0.0001) and CD34+VEGFR2+ cell frequency was higher at week 3 than on day 1 in WB (p=0.0002). On day one, CD34+ and CD34+CD45- cell frequencies in the mononuclear cell fraction (MNC) were higher in preterm than term infants (p=0.035 and p=0.049, respectively) but CD34+CD45-VEGFR2+ cell frequency (median 2.2/million MNC versus 3.8/million MNC) and erythropoietin levels were not significantly different. Transient increases in EPC were observed in five infants with infection. Four preterm infants who developed bronchopulmonary dysplasia had undetectable or low EPC through the first 3weeks of life. CONCLUSIONS: Gestational age and postnatal age influenced circulating CD34+ and CD34+VEGFR2+ but not CD34+CD45-VEGFR2+ (EPC) cell frequencies. Circulating EPC in neonates may be influenced by clinical stress.
Authors:
Kim Chi T Bui; Mark Weems; Manoj Biniwale; Aswathi A George; Ewa Zielinska; Colleen G Azen; Manuel Durand; Hisham Abdel-Azim
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  Early human development     Volume:  -     ISSN:  1872-6232     ISO Abbreviation:  Early Hum. Dev.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7708381     Medline TA:  Early Hum Dev     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Division of Neonatal Medicine, Department of Pediatrics; Keck School of Medicine of the University of Southern California, LAC+USC Medical Center and Children's Hospital Los Angeles, Los Angeles, CA, USA. Electronic address: kimchibui@earthlink.net.
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