Influence of extracellular Ca2+ and Mg2+ on chemotactic factor-induced neutrophil aggregation.

Abstract:

:The influences of extracellular Ca2+ and Mg2+ on chemotactic factor-induced rabbit polymorphonuclear neutrophil (PMN) aggregation was studied using a recently described Coulter counter assay technique. Compared with those of other PMN functional assays (adhesion, chemotaxis, degranulation, and phagocytosis), the cation requirements for cell aggregation appear unique. Chemotactic factor-induced aggregation did not occur in the absence of either cation. When the concentration of both cations was increased equivalently, aggregation increased. The effect plateaued at 2.8 mM of Ca2+ and Mg2+. When the concentration of one cation alone was increased, aggregation peaked. Further increases inhibited maximal aggregation. By systematic variation of the cation concentrations, optimal aggregation was found at Ca2+ and Mg2+ concentrations of 2.8 mM. At these concentrations, significant aggregation was induced with chemotactic doses of bacterial factor, the chemotactic fragment of human C5, and the synthetic chemotactic tripeptide, formyl-met-leu-phe. Thus, under these conditions, chemotactic factor-induced aggregation of neutrophils may be a useful indicator of interactions of chemotactic factors with neutrophils.

journal_name

Inflammation

journal_title

Inflammation

authors

O'Flaherty JT,Showell HJ,Ward PA

doi

10.1007/BF00921006

subject

Has Abstract

pub_date

1977-12-01 00:00:00

pages

265-76

issue

4

eissn

0360-3997

issn

1573-2576

journal_volume

2

pub_type

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