Molecules 2012, 17(5), 4824-4835; doi:10.3390/molecules17054824
Article

Inhibitory Effects of Acetylmelodorinol, Chrysin and Polycarpol from Mitrella kentii on Prostaglandin E2 and Thromboxane B2 Production and Platelet Activating Factor Receptor Binding

Sakina Saadawi, Juriyati Jalil* email, Malina Jasamai and Ibrahim Jantan
Drug and Herbal Research Centre, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
* Author to whom correspondence should be addressed.
Received: 26 January 2012; in revised form: 9 April 2012 / Accepted: 10 April 2012 / Published: 26 April 2012
(This article belongs to the Section Natural Products)
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Abstract: Acetylmelodorinol, chrysin and polycarpol, together with benzoic acid, benzoquinone and stigmasterol were isolated from the leaves of Mitrella kentii (Bl.) Miq. The compounds were evaluated for their ability to inhibit prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) production in human whole blood using a radioimmunoassay technique. Their inhibitory effect on platelet activating factor (PAF) receptor binding to rabbit platelet was determined using 3H-PAF as a ligand. Among the compounds tested, chrysin showed a strong dose-dependent inhibitory activity on PGE2 production (IC50 value of 25.5 µM), which might be due to direct inhibition of cyclooxygenase-2 (COX-2) enzymatic activity. Polycarpol, acetylmelodorinol and stigmasterol exhibited significant and concentration-dependent inhibitory effects on TXB2 production with IC50 values of 15.6, 19.1 and 19.4 µM, respectively, suggesting that they strongly inhibited COX-1 activity. Polycarpol and acetylmelodorinol showed strong dose-dependent inhibitory effects on PAF receptor binding with IC50 values of 24.3 and 24.5 µM, respectively.
Keywords: Mitrella kentii; chrysin; acetylmelodorinol; polycarpol; prostaglandin E2 (PGE2); thromboxane B2 (TXB2); platelet activating factor (PAF) antagonist

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MDPI and ACS Style

Saadawi, S.; Jalil, J.; Jasamai, M.; Jantan, I. Inhibitory Effects of Acetylmelodorinol, Chrysin and Polycarpol from Mitrella kentii on Prostaglandin E2 and Thromboxane B2 Production and Platelet Activating Factor Receptor Binding. Molecules 2012, 17, 4824-4835.

AMA Style

Saadawi S, Jalil J, Jasamai M, Jantan I. Inhibitory Effects of Acetylmelodorinol, Chrysin and Polycarpol from Mitrella kentii on Prostaglandin E2 and Thromboxane B2 Production and Platelet Activating Factor Receptor Binding. Molecules. 2012; 17(5):4824-4835.

Chicago/Turabian Style

Saadawi, Sakina; Jalil, Juriyati; Jasamai, Malina; Jantan, Ibrahim. 2012. "Inhibitory Effects of Acetylmelodorinol, Chrysin and Polycarpol from Mitrella kentii on Prostaglandin E2 and Thromboxane B2 Production and Platelet Activating Factor Receptor Binding." Molecules 17, no. 5: 4824-4835.

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