Oxidase activation in individual neutrophils is dependent on the onset and magnitude of the Ca2+ signal.

Abstract:

:Using single-cell ratio imaging of Fura-2-loaded neutrophils, we demonstrate that the heterogeneity and asynchrony of the oxidase response originates from variability in the timing and magnitude of the cytosolic free Ca2+ signal. The Ca2+ signals from individual cells could be classified into four types: (a) type 1, a transient rise in Ca2+ occurring within 6 s; (b) type 2, an oscillating cytosolic free Ca2+; (c) type 3, a latent Ca2+ transient significantly delayed (21-56 s); and (d) type 4, no significant Ca2+ rise. These response types accounted for approximately 41%, 15%, 26% and 18% of the population respectively for stimulation with 1 microM f-met-leu-phe peptide (n = 27) and 52.5%, 15%, 11.5% and 21% respectively for 0.1 microM f-met-leu-phe peptide (n = 52). The oxidase in neutrophils in which the cytosolic free Ca2+ concentration rose to greater than 250 nM always became activated. In the presence of extracellular Ca2+, cytosolic Ca2+ rose uniformly throughout the cell, whereas in the absence of extracellular Ca2+, a localised Ca2+ 'cloud' was observed in approximately 30% of cells. A localised activation of the oxidase accompanied the presence of the Ca2+ 'cloud' when the 250 nM Ca2+ threshold was exceeded. The data presented here therefore demonstrate a tight coupling in individual neutrophils between an elevation in cytosolic free Ca2+ above a threshold of 250 nM and activation of the oxidase.

journal_name

Cell Calcium

journal_title

Cell calcium

authors

Hallett MB,Davies EV,Campbell AK

doi

10.1016/0143-4160(90)90020-u

subject

Has Abstract

pub_date

1990-11-01 00:00:00

pages

655-63

issue

10

eissn

0143-4160

issn

1532-1991

pii

0143-4160(90)90020-U

journal_volume

11

pub_type

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