Parise-Filho R, Pastrello M, Pereira Camerlingo CE, Silva GJ, Agostinho LA, de Souza T, Motter Magri FM, Ribeiro RR, Brandt CA, Polli MC. The anti-inflammatory activity of dillapiole and some semisynthetic analogues.
Pharm Biol 2011;
49:1173-1179. [PMID:
22014265 DOI:
10.3109/13880209.2011.575793]
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Abstract
CONTEXT
Piper aduncum L. (Piperaceae) produces an essential oil (dillapiole) with great exploitative potential and it has proven effects against traditional cultures of phytopathogens, such as fungi, bacteria and mollusks, as well as analgesic action with low levels of toxicity.
OBJECTIVE
This study investigated the in vivo anti-inflammatory activity of dillapiole. Furthermore, in order to elucidate its structure-anti-inflammatory activity relationship (SAR), semisynthetic analogues were proposed by using the molecular simplification strategy.
MATERIALS AND METHODS
Dillapiole and safrole were isolated and purified using column chromatography. The semisynthetic analogues were obtained by using simple organic reactions, such as catalytic reduction and isomerization. All the analogues were purified by column chromatography and characterized by (1)H and (13)C NMR. The anti-inflammatory activities of dillapiole and its analogues were studied in carrageenan-induced rat paw edema model.
RESULTS
Dillapiole and di-hydrodillapiole significantly (p<0.05) inhibited rat paw edema. All the other substances tested, including safrole, were less powerful inhibitors with activities inferior to that of indomethacin.
DISCUSSION AND CONCLUSION
These findings showed that dillapiole and di-hydrodillapiole have moderate anti-phlogistic properties, indicating that they can be used as prototypes for newer anti-inflammatory compounds. Structure-activity relationship studies revealed that the benzodioxole ring is important for biological activity as well as the alkyl groups in the side chain and the methoxy groups in the aromatic ring.
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