Abstract
The activity of Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) as an index of thermogenesis induced by four Indonesian Zingiberaceous crude drugs, Boesenbergia rotunda, Curcuma longa, Kaempferia galanga, Zingiber montanum, was examined, and GC–MS analyses of extracts of these drugs were performed. The results showed that activation of PGC-1α by K. galanga was high, whereas no activation was shown for the other drugs. Ethyl p-methoxycinnamate and ethyl cinnamate were identified as the PGC-1α activating compounds of K. galanga. Furthermore, study on the structure-activity relationship revealed that ethyl p-methoxycinnamate has the strongest activity among the cinnamic acid derivatives. This suggests that the ester structure and the methoxy group are important factors responsible for the PGC-1α activity.
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