Document Detail


Neutrophil chemotaxis to leukotriene B4 in vitro is decreased for the human neonate.
MedLine Citation:
PMID:  8384710     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Leukotriene B4 (LTB4) is a product of arachidonic acid metabolism and a potent chemoattractant for adult polymorphonuclear leukocytes (PMN). LTB4 may be an important inflammatory mediator in neonatal lung disorders such as bronchopulmonary dysplasia, but neonatal PMN chemotaxis to LTB4 has not been studied. We compared total PMN migration and its components, chemotaxis and chemokinesis, to LTB4 in newborns and adults. PMN from healthy adults and umbilical blood of healthy, full-term newborns (n = 21 pairs) were incubated in a 48-well chemotaxis chamber using 10-microns thick polycarbonate membranes. Membranes with pore sizes of either 3 or 5 microns (diameter) were used to assess the influence of PMN deformability on chemotaxis. For both 3- and 5-microns filter pore sizes, total PMN migration increased in a dose-dependent manner from an LTB4 concentration of 10(-9) to 10(-6) M. The increase in total PMN migration was due entirely to chemotaxis (no chemokinesis) for newborns and adults. However, chemotaxis for the newborn was markedly attenuated, specifically, 14 and 24% of adult values at LTB4 concentrations of 10(-8) and 10(-7) M, respectively, with the 3-microns pore size. With the 5-microns filter pore size, newborn chemotaxis significantly increased to 40 and 49% of adult values at LTB4 concentrations of 10(-8) and 10(-7) M, respectively. We conclude that PMN chemotaxis to LTB4 in vitro is lower in newborns than in adults and part of this impairment may be caused by a decreased deformability of the newborn PMN.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
C Dos Santos; D Davidson
Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pediatric research     Volume:  33     ISSN:  0031-3998     ISO Abbreviation:  Pediatr. Res.     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-04-23     Completed Date:  1993-04-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0100714     Medline TA:  Pediatr Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  242-6     Citation Subset:  IM    
Affiliation:
Division of Neonatal-Perinatal Medicine, Schneider Children's Hospital of Long Island Jewish Medical Center, New Hyde Park, New York 11042.
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MeSH Terms
Descriptor/Qualifier:
Adult
Age Factors
Cell Movement
Chemotaxis, Leukocyte / drug effects*
Fetal Blood / immunology
Humans
Infant, Newborn
Leukotriene B4 / immunology,  pharmacology*
Micropore Filters
Neutrophils / drug effects,  immunology*,  physiology
Chemical
Reg. No./Substance:
71160-24-2/Leukotriene B4

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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