TY - JOUR
AU - MINAKAMI,, Shigeki
AB - Abstract When guinea pig peritoneal neutrophils were suspended in the isotonic medium of potassium, rubidium, and cesium ions at 37°C, the cells released superoxide, while low activity was observed in the isotonic medium of sodium and lithium ions. The activity induced in the potassium medium was enhanced by potassium-ionophores, valinomycin, and gramicidin, and decreased by a potassium channel blocker, 4-aminopyridine. The superoxide-releasing activity was not affected by the presence or absence of extracellular calcium but was inhibited by an intracellular calcium antagonist-8-( N,N -diethylamino)-octyl-3,4,5-trimethoxybenzoate(TMB-8) with the half-inhibition concentration of 50 μ M. The release of granular enzymes, lysozyme and β -glucronidase, was also induced in the isotonic potassium medium in the absence of extracellular calcium and inhibited by TMB-8. A remarkable elevation of the intracellular free calcium concentration in neutrophils, which was monitored by quin-2 fluorescence, was found when the cells were added to the potassium medium without calcium. The elevation was inhibited by the addition of TMB-8. These observations suggest that calcium mobilization from intracellular storage sites, not an influx of calcium from the extracellular medium, causes the release of superoxide and the granular enzymes in isotonic potassium medium. This content is only available as a PDF. © 1986, the Japanese Biochemical Society
TI - Spontaneous Induction of Superoxide Release and Degranulation of Neutrophils in Isotonic Potassium Medium: The Role of Intracellular Calcium
JF - The Journal of Biochemistry
DO - 10.1093/oxfordjournals.jbchem.a135632
DA - 1986-01-01
UR - https://www.deepdyve.com/lp/oxford-university-press/spontaneous-induction-of-superoxide-release-and-degranulation-of-Ko4oTeC12g
SP - 1591
EP - 1596
VL - 99
IS - 6
DP - DeepDyve
ER -