BACKGROUND: Peroxisome proliferator-activated receptors (PPARs) belong to the nuclear receptors superfamily and are transcription factors activated by specific ligands. Liver X receptors (LXR) belong to the nuclear hormone receptors and have been shown to play an important role in cholesterol homeostasis. From the previous screening of several medicinal plants for potential partial PPARγ agonists, the extracts of Cornus alternifolia were found to exhibit promising bioactivity. In this paper, we report the isolation and structural elucidation of four new compounds and their potential as ligands for PPAR. METHODS: The new compounds were extracted from the leaves of C. alternifolia and fractionated by high-performance liquid chromatography. Their structures were elucidated on the basis of spectroscopic evidence and analysis of their hydrolysis products. RESULTS: Three new iridoid glycosides including an iridolactone, alternosides A-C (1-3), a new megastigmane glycoside, cornalternoside (4) and 10 known compounds, were obtained from the leaves of C. alternifolia. Kaempferol-3-O-β-glucopyranoside (5) exhibited potent agonistic activities for PPARα, PPARγ and LXR with EC50 values of 0.62, 3.0 and 1.8 μM, respectively. CONCLUSIONS: We isolated four new and ten known compounds from C. alternifolia, and one known compound showed agonistic activities for PPARα, PPARγ and LXR. GENERAL SIGNIFICANCE: Compound 1 is the first example of a naturally occurring iridoid glycoside containing a β-glucopyranoside moiety at C-6. Published by Elsevier B.V.
BACKGROUND: Peroxisome proliferator-activated receptors (PPARs) belong to the nuclear receptors superfamily and are transcription factors activated by specific ligands. Liver X receptors (LXR) belong to the nuclear hormone receptors and have been shown to play an important role in cholesterol homeostasis. From the previous screening of several medicinal plants for potential partial PPARγ agonists, the extracts of Cornus alternifolia were found to exhibit promising bioactivity. In this paper, we report the isolation and structural elucidation of four new compounds and their potential as ligands for PPAR. METHODS: The new compounds were extracted from the leaves of C. alternifolia and fractionated by high-performance liquid chromatography. Their structures were elucidated on the basis of spectroscopic evidence and analysis of their hydrolysis products. RESULTS: Three new iridoid glycosides including an iridolactone, alternosides A-C (1-3), a new megastigmane glycoside, cornalternoside (4) and 10 known compounds, were obtained from the leaves of C. alternifolia. Kaempferol-3-O-β-glucopyranoside (5) exhibited potent agonistic activities for PPARα, PPARγ and LXR with EC50 values of 0.62, 3.0 and 1.8 μM, respectively. CONCLUSIONS: We isolated four new and ten known compounds from C. alternifolia, and one known compound showed agonistic activities for PPARα, PPARγ and LXR. GENERAL SIGNIFICANCE: Compound 1 is the first example of a naturally occurring iridoid glycoside containing a β-glucopyranoside moiety at C-6. Published by Elsevier B.V.
Authors: Mary H Grace; David M Ribnicky; Peter Kuhn; Alexander Poulev; Sithes Logendra; Gad G Yousef; Ilya Raskin; Mary Ann Lila Journal: Phytomedicine Date: 2009-03-20 Impact factor: 5.340
Authors: Limei Wang; Birgit Waltenberger; Eva-Maria Pferschy-Wenzig; Martina Blunder; Xin Liu; Clemens Malainer; Tina Blazevic; Stefan Schwaiger; Judith M Rollinger; Elke H Heiss; Daniela Schuster; Brigitte Kopp; Rudolf Bauer; Hermann Stuppner; Verena M Dirsch; Atanas G Atanasov Journal: Biochem Pharmacol Date: 2014-07-30 Impact factor: 5.858
Authors: Luã Tainã Costa Reis; Magnus Régios Dias da Silva; Silvia Lima Costa; Eudes da Silva Velozo; Ronan Batista; Suzana Telles da Cunha Lima Journal: Medicines (Basel) Date: 2018-01-15