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. 1993 Sep;110(1):447–453. doi: 10.1111/j.1476-5381.1993.tb13831.x

Suppression of inflammatory responses to 12-O-tetradecanoyl-phorbol-13-acetate and carrageenin by YM-26734, a selective inhibitor of extracellular group II phospholipase A2.

A Miyake 1, H Yamamoto 1, E Kubota 1, K Hamaguchi 1, A Kouda 1, K Honda 1, H Kawashima 1
PMCID: PMC2176023  PMID: 8220906

Abstract

1. YM-26734 [4-(3,5-didodecanoyl-2,4,6-trihydroxyphenyl)-7-hydroxy-2-(4-hydroxyph eny l) chroman] dose-dependently inhibited the activities of extracellular phospholipase A2 (PLA2): rabbit platelet-derived group II and porcine pancreas-derived group I PLA2, with IC50 values of 0.085 (0.056-0.129, n = 5) and 6.8 (5.0-9.6, n = 5) microM, respectively. 2. In contrast, YM-26734 did not reduce the activity of intracellular PLA2 prepared from mouse macrophages, which preferentially hydrolyzed arachidonoyl phospholipids at concentrations up to 50 microM. YM-26734 also showed no effect against either sheep seminal vesicle cyclo-oxygenase or rat leukocyte 5-lipoxygenase. 3. Linewater-Burk analysis showed that YM-26567-1 behaved as a competitive inhibitor of group II PLA2 derived from rabbit platelets, with a Ki value of 48 nM. 4. In mice, YM-26734 inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA, 1 microgram/ear)-induced ear oedema in a dose-dependent manner, with ED50 values of 45 (30-67) micrograms/ear (n = 5) and 11 (4-32) mg kg-1, i.v. (n = 5), but did not decrease arachidonic acid (4 mg/ear)-induced ear oedema at 1 mg/ear and 30 mg kg-1, i.v. 5. In rats, the accumulation of exudate fluids and leukocytes in the pleural cavity in response to carrageenin injection (2 mg) was significantly less in a group treated with YM-26734 (20 mg kg-1, i.v.) than in the control group (0.43 +/- 0.02 vs 0.59 +/- 0.03 g per cavity and 3.8 +/- 0.2 vs 4.9 +/- 0.3 x 10(7) cells per cavity, respectively; n = 5).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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