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Lee SC, Ahn J, Kim J, Lee JY, Kim J, Uddin MS, Lee SW, Kim CY. The Antioxidant and Anti-Inflammatory Properties of Merremia umbellata Extract. Antioxidants (Basel) 2023; 12:2037. [PMID: 38136157 PMCID: PMC10740611 DOI: 10.3390/antiox12122037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 12/24/2023] Open
Abstract
Merremia umbellata Hallier f. (MU) has been used as an anti-inflammatory agent to treat burns and scales. However, the potential anti-inflammatory mechanisms of action of this plant have not been elucidated. This study aimed to assess the antioxidant and anti-inflammatory effects of the leaf and shoot of MU grown in Bangladesh. The MU extract exhibited antioxidant activities as demonstrated by DPPH and ABTS free-radical-scavenging activities and the total polyphenol and total flavonoid contents. MU extract significantly reduced the lipopolysaccharide (LPS)-stimulated nitric oxide (NO) production in RAW264.7 macrophage. Accordingly, the gene levels of inducible NO synthase and cyclooxygenase-2 were suppressed. The MU extract alleviated the LPS-induced expression of TLR4, NF-κB, and inflammatory cytokines (TNF-α, IL-6, and IL-1β). The constituents of a MU extract were tentatively identified using UHPLC-PDA-QTOF/MS techniques. The main compounds were identified as 3,4-dicaffeoylquinic acid, 3,5-dicaffeoylquinic acid, quercitrin, and 4,5-dicaffeoylquinic acid. Molecular docking analysis revealed that these compounds interact with TLR4 protein, with quercitrin showing the highest binding affinity among them. Overall, our findings demonstrate the antioxidant and in vitro anti-inflammatory activities of MU and its potential compounds to target the TLR4-NF-κB signaling pathway. These findings are potentially used to further explore promising natural food ingredients that are effective in regulating inflammation.
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Affiliation(s)
- Sunny Chung Lee
- Department of Molecular and Medical Pharmacology, University of California, Los Angeles, CA 90095-1735, USA;
| | - Jongmin Ahn
- Natural Product Central Bank & Natural Medicine Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Cheongju 28116, Chungbuk, Republic of Korea;
| | - Jina Kim
- Department of Food and Nutrition, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea; (J.K.); (J.-Y.L.)
| | - Joo-Yeon Lee
- Department of Food and Nutrition, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea; (J.K.); (J.-Y.L.)
| | - Juhae Kim
- Research Institute of Human Ecology, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea;
| | - Md. Salah Uddin
- Ethnobotanical Database of Bangladesh, Tejgaon, Dhaka 1208, Bangladesh;
| | - Sang Woo Lee
- International Biological Material Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea;
| | - Choon Young Kim
- Department of Food and Nutrition, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea; (J.K.); (J.-Y.L.)
- Research Institute of Human Ecology, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Republic of Korea;
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