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Protective effects of ethyl gallate and pentagalloylglucose, the active components of Qingwen Baidu Decoction, against lipopolysaccharide-induced acute lung injury in rats

Authors Zhang Q, Nie J, Chen S, Li Q

Received 31 August 2018

Accepted for publication 12 November 2018

Published 19 December 2018 Volume 2019:13 Pages 71—77

DOI https://doi.org/10.2147/DDDT.S186029

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Cristina Weinberg

Peer reviewer comments 3

Editor who approved publication: Dr Anastasios Lymperopoulos


Qi Zhang,1 Jing Nie,2 Su-Juan Chen,2 Qiang Li2

1Department of Natural Medicine, School of Pharmacy, Fujian Medical University, Fuzhou, Fujian 350122, China; 2School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100102, China

Background: The aim of this study was to investigate the bioactive constituents of Qingwen Baidu Decoction (QBD) in a rat model of acute lung injury (ALI) induced by lipopolysaccharide (LPS). Our previous studies showed that ethyl gallate (EG) and pentagalloylglucose (PGG) were the active components of QBD for the treatment of ALI.
Materials and methods: We isolated two compounds and identified the structures of them by nuclear magnetic resonance and mass spectrometer. Lung injury was induced by intratracheal instillation with LPS (5 mg/kg). Rats were randomly divided into six groups: Control group; LPS group; 5 mL/kg DEX + LPS group; 6.6 g/kg QBD extract + LPS group; 17.16 mg/kg PGG + LPS group; 7.26 mg/kg EG + LPS group. The effects of compounds on LPS-induced the number of total cells, neutrophils influx, protein leakage, W/D weight ratio and pulmonary histological changes were examined.
Results: The results demonstrated that pretreatment with EG and PGG could notably inhibit lung edema and attenuate the pulmonary histological changes (P<0.05). The pretreatment also decreased the number of total cells and polymorphonuclear leukocytes in bronchoalveolar lavage fluid (BALF) (P<0.05).
Conclusion: Ethyl gallate and pentagalloylglucose of QBD played a protective role in preventing LPS-induced ALI. The results supported further study of EG and PGG as potential candidates for preventing ALI.

Keywords:
ethyl gallate, pentagalloylglucose, acute lung injury, Qingwen Baidu Decoction

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