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A bufadienolide-enriched fraction of Bryophyllum pinnatum effectively inhibits myometrium contractility in vitro

Santos, Stefanie and Haslinger, Christian and Klaic, Kristian and Faleschini, Maria Teresa and Mennet, Mónica and Potterat, Olivier and von Mandach, Ursula and Hamburger, Matthias and Simoes-Wüst, Ana Paula. (2019) A bufadienolide-enriched fraction of Bryophyllum pinnatum effectively inhibits myometrium contractility in vitro. Planta Medica, 85 (05). pp. 385-393.

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Official URL: https://edoc.unibas.ch/70143/

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Abstract

Bryophyllum pinnatum has been used since the 1970s to prevent premature labour, first in anthroposophic hospitals and, more recently, also in the main Swiss perinatal centres. However, it is not known which compounds in B. pinnatum leaves contribute to the tocolytic effect. Here we studied the effects of a flavonoid-enriched fraction, the corresponding flavonoid aglycon mixture, a bufadienolide-enriched fraction, and B. pinnatum leaf press juice on human myometrial contractility in vitro. The strength (area under the curve and amplitude) and frequency of contractions were recorded using strips of human myometrium mounted in an organ bath system. Cell viability assays were performed with the human myometrium hTERT-C3 and PHM1 – 41 cell lines. Repeated addition of the flavonoid-enriched fraction, flavonoid aglycon mixture, bufadienolide-enriched fraction, or B. pinnatum leaf press juice led to a progressive decrease of contraction strength, without jeopardising the vitality of myometrium strips. The bufadienolide-enriched fraction was the most active, since 1 µg/mL of the bufadienolide-enriched fraction lowered the area under the curve to 40.1 ± 11.8% of the initial value, whereas 150 µg/mL of the flavonoid-enriched fraction, 6.2 µg/mL of the flavonoid aglycon mixture, and 10 µg/mL of the B. pinnatum leaf press juice were required to achieve comparable inhibition. A progressive increase of contraction frequency was observed, except in the case of the flavonoid aglycon mixture, which did not affect frequency. None of the test substances decreased myometrial cell viability, even at concentrations of 500 µg/mL of the flavonoid-enriched fraction, 40 µg/mL of the flavonoid aglycon mixture, 3.8 µg/mL of the bufadienolide-enriched fraction, and 75 µg/mL of the B. pinnatum leaf press juice, i.e., higher than those used in the myometrium experiments. Given the concentrations of flavonoids in the flavonoid-enriched fraction and B. pinnatum leaf press juice, and of bufadienolides in the bufadienolide-enriched fraction and B. pinnatum leaf press juice, it appears that bufadienolides may be mainly responsible for the relaxant effect.
Faculties and Departments:05 Faculty of Science > Departement Pharmazeutische Wissenschaften > Pharmazie > Pharmazeutische Biologie (Hamburger)
UniBasel Contributors:Hamburger, Matthias and Faleschini, Maria Teresa and Potterat, Olivier
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Georg Thieme
ISSN:1612-1791
e-ISSN:2199-157X
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:07 Aug 2020 14:37
Deposited On:07 Aug 2020 14:37

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