Fargesone B
Fargesone B inhibits the vascular smooth muscle contraction by suppressing the voltage- and receptor-activated calcium influxes in a nonselective manner.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
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The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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Asia Pacif. J. Pharmacol.,1990,v.5:213-8.
Vasorelaxation of Rat Aorta by Fargesone B Isolated from the Flower buds of Magnolia Fargesii[Reference:
WebLink]
The effect of Fargesone B, isolated from Magnolia fargesii, on the contraction of rat aorta was studied.
METHODS AND RESULTS:
Fargesone B suppressed the contraction of aortic rings caused by cumulative concentrations of calcium (0.03-3 mM) in high potassium (60 mM) medium, with an IC50 of 12 .mu.g ml-1. It also relaxed the norepinephrine (NE, 3 .mu.M)-induced contraction, and its pretreatment inhibited both the phasic and tonic contractions elicited by NE, with an IC50 of about 100 and 30 .mu.g ml-1, respectively. This inhibition was also observed in the absence of calcium in the medium. It did not inhibit caffeine-induced phasic contraction. In quin-2-loaded cultured vascular smooth muscle cells, Fargesone B suppressed the rise of intracellular calcium caused by NE but not that by caffeine. 45Ca++ uptake by NE was also concentration-dependently inhibited by Fargesone B. Fargesone B did not change the levels of PGI2, cGMP or cAMP of rat aorta.
CONCLUSIONS:
It is concluded that Fargesone B inhibits the vascular smooth muscle contraction by suppressing the voltage- and receptor-activated calcium influxes in a nonselective
