PAF antagonism in vitro and in vivo by aglafoline from Aglaia elliptifolia Merr

Feng Nien Ko, Tian Shung Wu, Meei Jen Liou, Tur Fu Huang, Che Ming Teng

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Aglafoline, isolated from Aglaia elliptifolia Merr, inhibited in a selective and concentration-dependent manner the aggregation and ATP release reaction induced in washed rabbit platelets by PAF (platelet-activating factor). The IC50 values of aglafoline, BN52021 and kadsurenone on PAF (3.6 nM)-induced platelet aggregation were about 50, 12 and 18 μM, respectively. Aglafoline also inhibited [3H]PAF (3.6 nM) binding to washed rabbit platelets with an IC50 value of 17.8 ± 2.6 μM. The concentration-response curve of PAF-induced platelet aggregation was shifted to the right by aglafoline with pA2 and pA10 values of 5.97 and 5.04, respectively. Although thromboxane B2 formation caused by collagen and thrombin was partially suppressed by aglafoline, thromboxane B2 formation caused by ionophore A23187 and arachidonic acid was not affected. Aglafoline inhibited the [3H]inositol monophosphate formation caused by PAF but not that caused by collagen or thrombin in the presence of indomethacin (20 μM). The cAMP content of washed rabbit platelets was not affected by aglafoline. Rat femoral intravenous administration of aglafoline (10 mg/kg) did not affect blood pressure. However, aglafoline (10 mg/kg) both prophylactically and therapeutically antagonized PAF (2.5 μg/kg)-induced hypotensive shock in rats. Intravenous PAF (30 ng/kg) caused severe bronchoconstriction in guinea pigs. This effect was completely blocked by aglafoline. This implies aglafoline is an effective PAF antagonist not only in vitro, but also in vivo.

Original languageEnglish
Pages (from-to)129-135
Number of pages7
JournalEuropean Journal of Pharmacology
Volume218
Issue number1
DOIs
Publication statusPublished - 1992 Jul 21

All Science Journal Classification (ASJC) codes

  • Pharmacology

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