Phenanthroquinolizidine alkaloids from the roots of Boehmeria pannosa potently inhibit hypoxia-inducible factor-1 in AGS human gastric cancer cells
- PMID: 16872154
- DOI: 10.1021/np060081y
Phenanthroquinolizidine alkaloids from the roots of Boehmeria pannosa potently inhibit hypoxia-inducible factor-1 in AGS human gastric cancer cells
Abstract
A bioassay-guided phytochemical investigation on the methanol extract of Boehmeria pannosa, using a HIF-1-mediated reporter gene assay, led to the isolation of two phenanthroquinolizidine alkaloids, (-)-cryptopleurine (1) and (-)-(15R)-hydroxycryptopleurine (2). The structure of the new compound 2 was determined by spectroscopic methods. Compounds 1 and 2 potently inhibited the hypoxia-induced expression of a reporter gene under the control of a hypoxia response element (HRE) with IC(50) values of 8.7 and 48.1 nM, respectively. Furthermore, 1 and 2 suppressed the accumulation of HIF-1alpha protein in a dose-dependent manner, but not the HIF-1beta protein and inhibited expression of vascular endothelial growth factor (VEGF) by hypoxia.
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