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- W2013663385 abstract "This aim of this study was to investigate the crude extract of Buddleja crispa (Bc.Cr) and its active constituent(s) for their antihypertensive and antispasmodic activities. The Bc.Cr caused a dose-dependent (3-10 mg/kg) fall in mean arterial pressure in rats under anesthesia. In rabbit aorta preparations, Bc.Cr (0.03-1 mg/mL) caused inhibition of high K(+) (80 mM) precontractions. The Bc.Cr (0.03-1 mg/mL) also inhibited spontaneous and high K(+) precontractions in rabbit jejunum preparations, suggestive of calcium channel blocking (CCB) activity. CCB activity was further confirmed when pretreatment of the tissues with Bc.Cr (0.03-0.10 mg/mL) caused a rightward shift in Ca(++) concentration response curves, similar to verapamil. Among the pure compounds, BdI-H3 was more potent against the high K(+) than spontaneous contractions and was around eight times more potent than Bc.Cr against the spontaneous contractions while the other two compounds, BdI-2 and BH-3 were inactive. Activity-directed fractionation revealed that the hexane fraction was more potent against K(+) precontractions. These data indicate that Bc.Cr possesses a blood-pressure lowering effect, mediated possibly through CCB, though additional mechanism(s) cannot be ruled out. Among the pure compounds, Bdl-H3 is likely to be the active compound involved in the spasmolytic and possibly BP lowering effect of the parent crude extract." @default.
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- W2013663385 date "2009-04-01" @default.
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- W2013663385 title "Presence of blood-pressure lowering and spasmolytic constituents inBuddleja crispa" @default.
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- W2013663385 doi "https://doi.org/10.1002/ptr.2659" @default.
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