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Searching for calcium antagonists for hypertension disease therapy from Moutan Cortex, using bioactivity integrated UHPLC‐QTOF‐MS
Author(s) -
Lu Yujie,
Deng Yanfang,
Liu Wenjuan,
Jiang Min,
Bai Gang
Publication year - 2019
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.2828
Subject(s) - chemistry , calcium , pharmacology , chromatography , organic chemistry , medicine
Calcium channel blockers (CCBs) are currently the most commonly used drugs for the treatment of hypertension. Moutan Cortex (MC), a traditional Chinese herb, has been found to have an anti‐hypertensive effect. However, its potential mechanisms in the regulation of intracellular calcium concentration ([Ca 2+ ] i ) remain poorly understood. Objective The main objective of this work was to identify the potential calcium antagonists from MC and study their molecular mechanisms. Methods Ultra‐high performance liquid chromatography‐quadrupole‐time‐of‐fight‐mass spectrometry (UHPLC‐QTOF‐MS) analysis combined with a dual‐luciferase reporter assay was utilised to systematically screen the calcium antagonistic active ingredients in the methanol extract of MC. Additionally, the molecular mechanism of these compounds was further studied using live‐cell imaging analysis with the calcium ion (Ca 2+ ) probe dye fluo‐4/AM to monitor changes in [Ca 2+ ] i . Results Three monoterpenoids (paeoniflorin, benzoylpaeoniflorin and mudanpioside C), one phenolic acid (paeonol) and one gallotannin (1,2,3,4,6‐ O ‐pentagalloylglucose) were screened out as potential calcium antagonists in MC. Among them, the calcium antagonistic activity of benzoylpaeoniflorin, mudanpioside C and 1,2,3,4,6‐ O ‐pentagalloylglucose is first reported. Additionally, paeoniflorin, benzoylpaeoniflorin, mudanpioside C and paeonol can effectively block voltage‐operated Ca 2+ channels (VOCCs) to exert calcium antagonism, while 1,2,3,4,6‐ O ‐pentagalloylglucose plays a role in blocking inositol 1,4,5‐trisphosphate receptors (IP3Rs). Conclusion This work indicated that the anti‐hypertensive efficacy of MC acted through multiple components selectively antagonising multiple cell signalling pathways to regulate [Ca 2+ ] i . Furthermore, they could be considered as a reference standard for controlling the quality of Chinese medicinal materials.