Activity of taraxasteryl acetate on inflammation and heat shock protein synthesis.

Abstract	Pluchea sagittalis whole plant dichloromethane extract showed inhibitory activity in several inflammatory models: rat hind paw-edema, mice ear edema, and air-pouch rat granuloma. The extract inhibited the production of reactive oxygen species (ROS) and reactive nitrogen species (RNS) in stimulated human neutrophils. It also showed inhibitory effect on heat shock protein 72 (hsp72) synthesis in stimulated neutrophils, while it had opposite effects on unstimulated cells. The triterpene taraxasteryl acetate was obtained from the dichloromethane extract by bioassay directed isolation, being active against induced ROS and RNS production in human neutrophils. In mice ear edema (induced by phorbol-12-mirystate-13-acetate, croton oil and arachidonic acid), taraxasteryl acetate showed a topical anti-inflammatory activity similar to the extract, but at 1/20 of the dose. The same ratio was observed for the inhibition of hsp72 production in stimulated human neutrophils. In unstimulated monocytes and neutrophils, taraxasteryl acetate showed a higher stimulating activity of hsp72 production than the extract, involving different mechanisms in each cell type. To our knowledge, taraxasteryl acetate is the first natural product for which a dual effect on the hsp response is reported.
Authors	F Pérez-García, E Marín, T Parella, T Adzet, S Cañigueral
Journal	Phytomedicine : international journal of phytotherapy and phytopharmacology (Phytomedicine) Vol. 12 Issue 4 Pg. 278-84 (Apr 2005) ISSN: 0944-7113 [Print] Germany
PMID	15898705 (Publication Type: Journal Article)
Chemical References	Anti-Inflammatory Agents, Non-Steroidal HSP72 Heat-Shock Proteins Heat-Shock Proteins Plant Extracts Reactive Nitrogen Species Reactive Oxygen Species Sterols Triterpenes Arachidonic Acid taraxasteryl acetate Croton Oil Tetradecanoylphorbol Acetate
Topics	Animals Anti-Inflammatory Agents, Non-Steroidal (administration & dosage, pharmacology, therapeutic use) Arachidonic Acid Asteraceae Croton Oil Dose-Response Relationship, Drug Edema (chemically induced, prevention & control) Female Flow Cytometry Granuloma, Foreign-Body (prevention & control) HSP72 Heat-Shock Proteins Heat-Shock Proteins (biosynthesis, drug effects) Humans Male Mice Mice, Inbred Strains Neutrophils (drug effects, metabolism) Phytotherapy Plant Extracts (administration & dosage, pharmacology, therapeutic use) Plant Structures Rats Rats, Sprague-Dawley Rats, Wistar Reactive Nitrogen Species (biosynthesis) Reactive Oxygen Species Sterols (administration & dosage, pharmacology, therapeutic use) Tetradecanoylphorbol Acetate Triterpenes (administration & dosage, pharmacology, therapeutic use)

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