Antioxidant and anti-aging effects of quercetin 3-O-rhamnoside isolated from Houttuynia cordata Thunb extract on Caenorhabditis elegans.

Hyeon Ji Kim, Suk Heung Oh, Jun Hyeong Kim

Department of Food and Biotechnology, Woosuk University, Wanju, 55338, Jeonbuk-do, Republic of Korea; Korea Research Institute of Bioscience and Biotechnology (KRIBB), 181 Ipsin gil, Jeongeup si, Jeolla-buk do, Republic of Korea. Electronic address: [email protected]. · pubmed

Paper

Abstract

Humans inevitably generate reactive oxygen species (ROS) during respiration, leading to oxidative stress, which antioxidants counteract. However, aging and lifestyle factors increase ROS levels, contributing to disease. This study evaluated the antioxidant and anti-aging effects of Houttuynia cordata extract and fractions using Caenorhabditis elegans. The most active ethyl acetate (EA) fraction was isolated via open column chromatography and identified as quercetin 3-O-rhamnoside (quercitrin) through NMR and LC-MS/MS analysis. Antioxidant enzyme activities (SOD, catalase, SOD-3) and intracellular ROS inhibition were assessed, alongside stress resistance under oxidative and thermal conditions. Additionally, quercitrin's effects on aging were examined by measuring SIR2.1 and DAF-2 expression in the insulin signaling pathway (IIS) and analyzing its concentration-dependent regulation of DAF-16 using GFP transgenic worms. Quercitrin modulated aging related proteins, enhanced antioxidant enzyme activity, inhibited ROS accumulation, extended lifespan, and improved resistance to thermal stress. These findings highlight quercitrin's strong antioxidant and anti-aging properties.

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Research summary

Quercetin 3-O-rhamnoside enhances antioxidant enzyme activity and extends lifespan in Caenorhabditis elegans. The study addresses the root causes of aging by investigating the effects of a natural compound on oxidative stress and lifespan extension, which are central to longevity research.

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