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This study investigated the effects of the methanol extracts of Morinda citrifolia containing numerous anthraquinone and iridoid on phospholipase A(2) (PLA(2)) isozyme. PLA(2) activity was measured using various PLA(2) substrates, including 10-pyrene phosphatidylcholine, 1-palmitoyl-2-[(14)C]arachidonyl phosphatidylcholine ([(14)C]AA-PC), and [(3)H]arachidonic acid (AA). The methanol extracts suppressed melittin-induced [(3)H]AA release in a concentration-dependent manner in RAW 264.7 cells, and inhibited cPLA(2)/sPLA(2)-induced hydrolysis of [(14)C]AA-PC in a concentration- and time-dependent manner. A Dixon plot showed that the inhibition by methanol extracts on cPLA(2) and sPLA(2) appeared to be competitive with inhibition constants (K(i)) of 3.7microg/ml and 12.6microg/ml, respectively. These data suggest that methanol extracts of Morinda citrifolia inhibits both Ca(2+)-dependent PLA(2) such as, cPLA(2) and sPLA(2). Therefore, Morinda citrifolia may possess anti-inflammatory activity secondary to Ca(2+)-dependent PLA(2) inhibition.

the korean journal of physiology and pharmacology/korean journal of physiology and pharmacology

Morinda citrifoliaInhibits Both Cytosolic Ca2+-dependent Phospholipase A2and Secretory Ca2+-dependent Phospholipase A2