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Nguyen, Zhao, Le, Kim, Kim, Yoon, Ko, Woo, and Woo: Phenolic Constituents and Their Anti-inflammatory Activity from Echinochloa utilis Grains
Original Article

Natural Product Sciences 2016;22(2):140-145.

Published online: 17 December 2016

DOI: https://doi.org/10.20307/nps.2016.22.2.140

Phenolic Constituents and Their Anti-inflammatory Activity from Echinochloa utilis Grains

Duc Hung Nguyen1, 4, Bing Tian Zhao1, Duc Dat Le1, Ki Yun Kim2, Young Ho Kim2, Young Ho Yoon3, Jee Youn Ko3, Koan Sik Woo3, Mi Hee Woo∗, 1

1College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea

2Laboratory of Immunobiology, School of Life Science and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 39061, Republic of Korea

3Functional Cereal Crop research Division, Department of Functional Crop, NICS, RDA, 50426, Republic of Korea

4Phu Tho College of Pharmacy, Viettri City, Phutho Province 290000, Vietnam

∗Author for correspondence Mi Hee Woo, College of Pharmacy, Catholic University of Daegu, Gyeongsan 38430, Republic of Korea Tel: +82-53-850-3620; E-mail: woomh@cu.ac.kr

Received 8 December 2015       Revised 2 February 2016       Accepted 4 February 2016

Copyright © 2016 The Korean Society of Pharmacognosy

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Seven phenolic compounds including p-coumaric acid (1), 4-hydroxybenzoic acid (2), 4-hydroxy-benzaldehyde (3), vanillic acid (4), luteolin (5), acacetin (6), and tricin (7), were isolated from the methylene chloride and ethyl acetate fractions of Echinochloa utilis grains. Compounds (1–4, 6) were isolated for the first time from this plant. These compounds were tested for inhibitory activities against LPS-induced NO production in RAW 264.7 cells. Compounds 5 and 6 displayed significant inhibitory effects, with IC50 values of 27.9 ± 2.6 and 14.0 ± 1.1 µM, respectively. The results suggested that E. utilis ethanolic extract may be used as a potential source of anti-inflammatory agents and functional foods for the treatment of allergic diseases.

Keywords: Echinochloa utilis, Phenolic compounds, NO production

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Fig. 1.
Chemical structures of compounds 1–7 isolated from the grains of E. utilis.
nps-22-140f1.tif
Fig. 2.
The effects of compounds 5 and 6 on LPS-induced rise of iNOS and COX-2 levels in RAW 264.7 cells. The RAW 264.7 cells were pretreated with LPS (0.1 µg/mL) for 30 min, followed by concentrations of 2.5, 5.0, and 10.0 µg/mL for 5 and 1.25, 2.5, and 5.0 µg/mL for 6 for 24 h. Whole-cell lysates were blotted with the indicated antibodies. β-Actin level was used as a loading control. The expressions of iNOS and COX-2 were assessed by Western blotting analysis using specific antibodies for individual proteins. The results are representatives of three independent experiments.
nps-22-140f2.tif
Table 1.
Effects of IC50 values of isolated compounds 1–7 from E. utilis on LPS-stimulated NO production and cell viability.
Compounds NO production and cell viabilityb
IC50 value (µM) Survival rate (%)
1 > 100 > 99
2 > 100 > 99
3 > 100 > 99
4 > 100 100
5 27.9 ± 2.6 > 99
6 14.0 ± 1.1 100
7 > 100 > 99
Dexamethasonea 0.4 ± 0.05 100

a Dexamethasone was used as a positive control. Data are present as mean ± SD (n = 3). IC50 values, concentrations inhibiting NO production by 50%.

b Nitrite was measured using Griess reaction at 20 h after treatment of LPS (0.1 µg/mL) in the presence or absence of various concentrations (1.25–100 µg/mL) of each compounds. Survival rates were carried out at concentration of 100 µg/mL and deter-mine by the MTT colorimetric assay.

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