Abstract
Terpenoids from Salvia species have been identified to possess biological properties as antiprotozoal agents. Here, we evaluated the antiamoebic and antigiardial activities of 14 known clerodane and modified clerodane-type diterpenes isolated from five Mexican Salvia species against Entamoeba histolytica and Giardia lamblia, and analyzed the effects of the functionalities in decalin ring or in the whole clerodane framework to visualize the structural requirements necessary to produce an antiprotozoal activity. Among these, linearolactone was the most active clerodane diterpene against both protozoa with IC50 values of 22.9 μM for E. histolytica and of 28.2 μM in the case of G. lamblia. In this context it may be a lead compound for the development of novel therapeutic agent for the treatment of diarrhea and dysentery. The remaining diterpenes assayed showed moderate to weak activity against both protozoa. These findings give support to the use of Salvia species in the traditional medicine from México for the treatment of diarrhea.
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