[Nitroblue tetrazolium reduction by human blood neutrophils. II. The influence of sodium and potassium ions].
Activity of blood neutrophils of 18 healthy volunteers (4 men and 14 women aged from 20 to 32 years) was investigated in the Nitroblue Tetrazolium (NBT) reduction reaction in Na- and K-phosphate buffers (0.1 M, pH 7.3) after a preliminary incubation of heparinized blood (37 degrees C, 0-7 h). It was found that the percentage of NBT-positive neutrophils in the presence of Na+ is higher than in the presence of K+. The dependence of percentage of NBT-positive neutrophils on the reaction time is described by a kinetic equation with constants k1 and k2, characterizing accordingly, speeds of NBT absorption and reduction by neutrophils. It has been shown that k1, k2 and k1/k2 values differ in potential phagocytes and in neutrophils, which are not capable of adherence. The kinetics constants of the latter cells do not depend on both cations and incubation time, while the percentage of NBT-positive potential phagocytes, and their k1 and k2 in the presence of Na+ are higher than in the presence of K+, and the values of described parameters are changed during incubation. During incubation the percentage of NBT-positive neutrophils increases to result in a partial aggregation of thrombocytes, as a consequence of excretion in the blood of products involved in this process.
Gerasimov
I G
IG
Ignatov
D Iu
DIu
D000328:Adult; D002412:Cations; D005260:Female; D006801:Humans; D008297:Male; D018375:Neutrophil Activation; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism*; D009580:Nitroblue Tetrazolium / Q000378:metabolism*; D010084:Oxidation-Reduction; D011188:Potassium / Q000502:physiology*; D012964:Sodium / Q000502:physiology*
D002412:Cations; D009580:Nitroblue Tetrazolium; D012964:Sodium; D011188:Potassium