Alterations in complement-induced shape change and stimulus-specific superoxide anion generation by neonatal calf neutrophils.

Abstract:

:Increased susceptibility of neonates to infection may be related to defects in newborn neutrophil (PMN) functional activities, including altered responses to complement fragments (Cf) and defective microbicidal activity. We therefore compared the kinetics of newborn and adult bovine PMN membrane shape change responses following stimulation with zymosan-activated plasma (ZAP) as a source of Cf. Measurement of PMN membrane shape change was a rapid, sensitive, and reproducible measure of Cf stimulation within a population of PMNs; a maximum of 67-85% of the PMNs exhibited easily detectable membrane ruffling, lamellipodia formation, and polarity within 2 min. Newborn PMNs exhibited significantly increased (P less than 0.01) membrane shape change at 20, 30, 60, 120, and 300 sec after Cf stimulation. A maximum of 85.8 +/- 3.2% of newborn PMNs exhibited such Cf-induced shape changes by 120 sec. which was significantly greater (P less than 0.01) than the maximum stimulation (67.7 +/- 4.3%) attained with adult PMNs. These data indicate enhanced kinetics of induced newborn PMN membrane shape change in response to Cf stimulation. We also compared stimulus-specific superoxide anion (O2-) generation as a measure of respiratory burst activity after incubation of newborn and adult PMNs with soluble (phorbol myristate acetate, PMA) and particulate (opsonized zymosan, OZ) stimuli. When PMA was used as the stimulus, newborn PMNs generated significantly less O2- (9.3 +/- 0.5 nmol O2-/10(6) PMN, P less than 0.05) than did adult PMNs (12.4 +/- 0.3 nmol O2-/10(6) PMN). This finding was reversed when OZ was used as the stimulus; newborn PMNs generated significantly more O2- (7.7 +/- 0.4 nmol O2-/10(6) PMN, P less than 0.05) than did adult PMNs (5.5 +/- 0.5 nmol O2-/10(6) PMN). These findings collectively document biochemical and morphological differences between newborn and adult PMNs as determined by stimulus-specific O2- generation and Cf-induced membrane shape change. Such differences may be important to neonatal disease susceptibility.

journal_name

Inflammation

journal_title

Inflammation

authors

Holden W,Slauson DO,Zwahlen RD,Suyemoto MM,Doré M,Neilsen NR

doi

10.1007/BF00914305

subject

Has Abstract

pub_date

1989-12-01 00:00:00

pages

607-20

issue

6

eissn

0360-3997

issn

1573-2576

journal_volume

13

pub_type

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