[Effects of sodium 18 beta-glycrrhetinic acid on the production of active oxygen species and the concentration of intracellular free Ca2+ in rat neutrophils].
The effects of sodium 18 beta-glycyrrhetinic acid (SGA) on the production of active oxygen species (AOS) and the concentration of intracellular free Ca2+ ([Ca2+]i) in the rat neutrophils were studied by the methods of luminoldependent chemiluminescence and calcium indicator Fura-2 loading. The results showed that SGA 0.8-12.7 mumol.L-1 selectively inhibited calcium inophore A-23187-stimulated AOS production with IC50 1.4 mumol.L-1, while SGA 25.4-203 mumol.L-1 stimulated neutrophils to generate AOS and potentiated the action of chemotactic peptide f-MLP on inducing AOS production. SGA 25.4-203 or 6.3-50.7 mumol.L-1 depressed the [Ca2+]i rise in neutrophils stimulated by A-23187 or f-MLP; in the contrast, verapamil or diltiazem has higher effective concentration more than 100 or 200 mumol.L-1 to f-MLP and left [Ca2+]i rise induced by A-23187 unaffected. SGA 101.5-203 mumol.L-1 also caused [Ca2+]i rise in neutrophils. The result analysis indicate that the effect of SGA on AOS production has no relationship with its regulation to [Ca2+]i in neutrophils.
Wu
Y J
YJ
Department of Pharmacology, Lanzhou Medical College, China.
Li
X F
XF
D000818:Animals; D002118:Calcium / Q000378:metabolism*; D005260:Female; D006034:Glycyrrhetinic Acid / Q000494:pharmacology*; D008297:Male; D009504:Neutrophils / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
D006034:Glycyrrhetinic Acid; D010100:Oxygen; D002118:Calcium