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Assessment of the Antidiarrheal Activity and Chemical Composition of Dichloromethane Extract from Macleaya Cordata

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Abstract

Macleaya cordata (Willd.) R.Br., Papaveraceae, is a traditional Chinese herb, and it has been proven to have good antimicrobial, anti-inflammatory, and antidiarrheal properties. However, its antidiarrheal constituents and mechanism have not been clarified yet and therefore need to be determined. In this paper, the antidiarrheal activity and active fraction of Macleaya cordata ethanol extract were evaluated based on a series of in vivo assays involving castor oil-induced diarrhea, intestinal transit, and enteropooling. The chemical constituents of the antidiarrheal fraction were analyzed by UPLC-ESI–MS, and the binding affinities with the target proteins of the cAMP/cGMP-regulated cystic fibrosis transmembrane conductance regulator (CFTR), aquaporin 4 (AQP4), Na+/H+ exchanger 1 (NHE1), Na+/H+ exchanger 3 (NHE3), and Na+/glucose cotransporter 1 (SGLT1) were elucidated in an in silico study. Moreover, the screened compound was separated by silica gel chromatography and tested based on the castor oil-induced diarrhea model. In the antidiarrheal investigation, the dichloromethane fraction at 50, 100, and 200 mg/kg inhibited intestinal transit and decreased intraluminal fluid accumulation in a dose-dependent manner. In addition, UPLC-ESI–MS analysis of the chemical composition of the active fraction revealed that 6-methoxydemethylatedsanguinarine, ethoxychelerthrine, 6-methoxyldihydrochelerythrine, dihydrochelerythrine, and dihydrosanguinarine were the main components. Molecular docking results showed the main active components with strong binding affinity for the ion channels. The best binding component, dihydrosanguinarine, exerts its antidiarrheal activity in a dose-dependent manner at 25, 50, and 100 mg/kg. Real-time quantitative PCR (qRT-PCR) experiments showed that dihydrosanguinarine could downregulate the expression of the CFTR and upregulate the expression of AQP4, NHE1, NHE3, and SGLT1 to reduce fecal frequencies. Therefore, the most predominant component of Macleaya cordata against diarrhea was dihydrosanguinarine, which exerts an antidiarrheal effect by regulating the activity of ion channels, supporting the traditional use of Macleaya cordata in the treatment of diarrhea.

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Funding

This research was supported by the National Natural Science Foundation of China (Grant No. 31572559) and the Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province (Grant No. LBH- Q18020).

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Contributions

LG and ZS conceived and designed the study. LG and LA performed the experiments. FY, WL, WH, and XZ acquired the data. LG, LA, FY, and CG analyzed the data. LG drafted and critically revised the article. LG, LA, FY, WL, XZ, WH, and ZS approved the final manuscript.

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Correspondence to Zunlai Sheng.

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The authors declare that the procedures followed were in accordance with the regulations of the relevant clinical research ethics committee and with those of the Code of Ethics of the World Medical Association (Declaration of Helsinki).

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The authors declare no competing interests.

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Guo, L., Ai, L., Yang, F. et al. Assessment of the Antidiarrheal Activity and Chemical Composition of Dichloromethane Extract from Macleaya Cordata. Rev. Bras. Farmacogn. 32, 1009–1020 (2022). https://doi.org/10.1007/s43450-022-00337-8

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  • DOI: https://doi.org/10.1007/s43450-022-00337-8

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