0000000000433259
AUTHOR
María Tordera
Studies on the gastric anti-ulcer activity of hypolaetin-8-glucoside
The gastric anti-ulcer activity of hypolaetin-8-O-β-D-glucoside (H-8-G), a flavonoid isolated from Sideritis leucantha, has been studied in rats. This compound significantly reduced gastric lesions induced by ethanol or acetylsalicylic acid (ASA), with an increase in mucus production. In the pylorus-ligated rat, H-8-G did not affect the volume of gastric secretion but decreased its acidity and peptic activity. The anti-ulcer activity of this flavonoid does not depend on stimulation of cell proliferation in the rat gastric mucosa. Our results suggest that H-8-G activity is related to its cytoprotective effects [mediated by endogenous prostaglandins (PGs) and associated to an increase in gast…
Influence of anti-inflammatory flavonoids on degranulation and arachidonic acid release in rat neutrophils.
We assessed the effects of 24 flavonoid derivatives, reported as anti-inflammatory, on lysosomal enzyme secretion and arachidonic acid release in rat neutrophils. Amentoflavone, quercetagetin- 7-O -glucoside, apigenin, fisetin, kaem pferol, luteolin and quercetin were the most potent inhibitors of β-glucuronidase and lysozyme release. The first com pound was also able to inhibit basal release. These flavonoids besides chrysin and to a reduced extent, naringenin, significantly inhibited arachidonic acid release from membranes. A correlation between degranulation and arachidonic acid release was found for this series of compounds. Structureactivity relationships and implications for the anti-…