Warangalone
Warangalone is a powerful inhibitor of protein kinase A, shows marked effectiveness as an anti-inflammatory on the phospholipase A(2)-induced paw edema and on the 12-O-tetradecanoylphorbol 13-acetate-induced ear edema in mice, after systemic and local administration, respectively.Warangalone also shows significant cytotoxicity against HL-60 cells. Warangalone with cAK may contribute to its biological effects in vivo and to the insecticidal activity of the plant D. scandens.
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Phytochemistry. 1997 Mar;44(5):787-96.
Specific inhibition of cyclic AMP-dependent protein kinase by warangalone and robustic acid.[Pubmed:
9115691]
The prenylated isoflavone Warangalone from the insecticidal plant Derris scandens is a selective and potent inhibitor of rat liver cyclic AMP-dependent protein kinase catalytic subunit (cAK) (IC50 3.5 microM).
METHODS AND RESULTS:
The inhibition of rat liver cAK by Warangalone is non-competitive with respect to both ATP and the synthetic peptide substrate (LRRASLG) employed in this study. Warangalone is a poor inhibitor of avian calmodulin-dependent myosin light chain kinase (MLCK), rat brain Ca(2+)- and phospholipid-dependent protein kinase C (PKC) and wheat embryo Ca(2+)-dependent protein kinase (CDPK). The related plant derived prenylisoflavones are also potent cAK inhibitors. Thus, 8-gamma-gamma-dimethylallylwighteone, 3' -gamma-gamma-dimethlallylwighteone and nallanin are inhibitors of cAK with IC50 values in the range 20-33 microM. The prenyl-substituted isoflavones tested in this study are ineffective or poor as inhibitors of PKC. Thus nallanin is a poor PKC inhibitor (IC50 value of 120 microM). The related isoflavones biochanin A and genistein are poor inhibitors of cAK (IC50 values 100 microM and 126 microM, respectively). Genistein inhibits MLCK (IC50 value 14 microM) but biochanin A is a poor MLCK inhibitor (IC50 value 300 microM). The D. scandens prenyl-isoflavones and related isoflavones are ineffective inhibitors of wheat embryo Ca(2+)-dependent protein kinase (CDPK). The 4-methoxy-3-phenyl-coumarin robustic acid is a potent inhibitor of rat liver cAK (IC50 value 10 microM) but is a poor inhibitor of rat brain PKC, avian MLCK and wheat embryo CDPK. The coumarins 5-methoxypsoralen and 4,4'-di-O-methyl scandenin are poor cAK inhibitors (IC50 values 240 and 248 microM, respectively).
CONCLUSIONS:
All of the non-prenylated coumarins examined are ineffective as inhibitors of the eukaryote signal-regulated protein kinases cAK, MLCK, PKC and CDPK. The selective, high affinity interaction of Warangalone and robustic acid with cAK may contribute to their biological effects in vivo and to the insecticidal activity of the plant D. scandens.
J Nat Prod. 2003 Jun;66(6):891-3.
Warangalone, the isoflavonoid anti-inflammatory principle of Erythrina addisoniae stem bark.[Pubmed:
12828487]
The prenylisoflavone Warangalone has been isolated from the bark of Erythrina addisoniae.
METHODS AND RESULTS:
This compound, previously recognized as a powerful inhibitor of protein kinase A, showed marked effectiveness as an anti-inflammatory on the phospholipase A(2)-induced paw edema and on the 12-O-tetradecanoylphorbol 13-acetate-induced ear edema in mice, after systemic and local administration, respectively.
Planta Med. 2006 Apr;72(5):424-9.
Induction of apoptosis by isoflavonoids from the leaves of Millettia taiwaniana in human leukemia HL-60 cells.[Pubmed:
16557456]
METHODS AND RESULTS:
We have isolated two new isoflavonoids, millewanin-F (1) and furowanin-A (2), together with five known isoflavonoids from the leaves of Millettia taiwaniana Hayata (Leguminosae) and examined their effects on the growth of human leukemia HL-60 cells. Among the isolated isoflavonoids, furowanin-A (2), Warangalone (3), isoerysenegalensein-E (4), and euchrenone b10 (6) showed significant cytotoxicity against HL-60 cells. After treatment with three of the cytotoxic isoflavonoids, furowanin-A (2), Warangalone (3), and isoerysenegalensein-E (4), fluorescence microscopy with Hoechst 33,342 staining revealed that the percentage of apoptotic cells with fragmented nuclei and condensed chromatin increased in a time-dependent manner. In addition, the activities of caspase-9 and caspase-3 were also enhanced in a time-dependent manner upon treatment with the isoflavonoids 2, 3, and 4. Caspase-9 and caspase-3 inhibitors suppressed apoptosis induced by isoflavonoids 2, 3, and 4.
CONCLUSIONS:
These results suggest that the isoflavonoids induced apoptosis in HL-60 cells through activation of the caspase-9/caspase-3 pathway, which is triggered by mitochondrial dysfunction.
