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Psiguanol, a novel α -pyrone derivative from Psidium guajava leaves and vasorelaxant activity in rat aorta cells through intracellular cGMP-dependent opening of calcium channels.
Natural Product Research 2024 January 11
The phytochemical investigation of Psidium guajava leaves led to the isolation of total nineteen compounds which belongs to meroterpenoids, flavonoid, phenolics, and triterpenoids. The compounds were isolated using extensive chromatography techniques and identified as psiguanol ( 4 ), as new compound along with guajadial ( 1 ), psidial A ( 2 ), β -caryophyllene ( 3 ), quercetin ( 5 ), avicularin ( 6 ), guaijaverin ( 7 ), hyperin ( 8 ), rutin ( 9 ), ursolic acid ( 10 ), corosolic acid ( 11 ), asiatic acid ( 12 ), β -sitosterol ( 13 ), β -sitosterol-D-glucoside ( 14 ), ellagic acid ( 15 ), 3,3',4'-trimethylellagic acid 4-O-glucoside ( 16 ), protocatechuic acid ( 17 ), gallic acid ( 18 ), and tricosanoic acid ( 19 ) as known molecules. The compound 16 was isolated for the first time from this plant. The isolated compounds were evaluated for vasorelaxation activity in rat aorta cells and it was observed that compound 4 exhibited the most potent vasorelaxation response in the ex-vivo model in isolated rat aorta cells. Mechanistically, the vasorelaxation activity of 4 was mediated through cGMP-dependent BKCa channel opening.
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