6533b7d4fe1ef96bd126282c

RESEARCH PRODUCT

Anti-inflammatory activity of berenjenol and related compounds.

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Berenjenol ( 1), isolated from OXANDRA cf. XYLOPIOIDES (Annonaceae), was tested on two different experimental models of inflammation. The compound showed anti-inflammatory activity in the test of acute mouse ear edema induced by TPA (54 % inhibition, 1 μmol/ear) as well as in the test of subchronic inflammation induced by repeated application of TPA (57 % inhibition, 7 × 1 μmol/ear). Moreover, while it reduced the expression of both COX-2 (65 % inhibition at 50 μM) and iNOS (80 % inhibition at 50 μM), it was not active against TNF- α and IL-1 β in murine macrophages (RAW 264.7) stimulated with LPS. Structural modification of 1 gave two derivatives, berenjenol acetate ( 2) and 3-oxo-berenjenol ( 3). Of these, the latter had a high degree of activity in the acute test (66 % inhibition, 1.1 μmol/ear), whereas the former showed no enhanced pharmacological properties. Interestingly, the original compound exhibited higher activity than either of its derivatives in the subchronic model. We thus concluded that whereas 3-oxidation of 1 (compound 3), but not 3-acetylation ( 2), increases the activity in the acute model of inflammation, structural modification of 1 does not enhance the compound’s effects in the subchronic model. COX:cyclooxygenase DMSO:dimethyl sulfoxide FBS:fetal bovine serum IL-1β:interleukin-1β LPS:lipopolysaccharide MTT:3-(4,5-dimethylthiazolyl)-2,5-diphenyl-tetrazolium bromide NOS:nitric oxide synthase PBS:phosphate-buffered saline PKC:protein kinase C TNF-α:tumor necrosis factor-α TPA:12- O-tetradecanoylphorbol 13-acetate