| Summary: | Oxidative stress and inflammation are commonly present in many chronic diseases. These responses are closely related to pathophysiological processes. The inflammatory process can induce oxidative stress and vice versa through the activation of multiple pathways. Therefore, agents with antioxidant and/or anti-inflammatory activities are very useful in the treatment of many pathologies. <i>Clerodendrum cyrthophyllum</i> Turcz, a plant belonging to the Verbenaceae family, is used in Vietnamese traditional medicine for treating migraine, hypertension, inflammation of the throat, and rheumatic arthritis. Despite its usefulness, studies on its biological properties are still scarce. In this study, ethanol extract (EE) of leaves of <i>C. cyrtophyllum</i> showed protective activity against CuSO<sub>4</sub> toxicity. The protective activity was proven to relate to antioxidant and anti-inflammatory properties. EE exhibited relatively high antioxidant activity (IC<sub>50</sub> of 16.45 µg/mL) as measured by DPPH assay. In an in vivo anti-antioxidant test, three days post fertilization (dpf) zebrafish larvae were treated with different concentrations of EE for 1 h and then exposed to 10 µM CuSO<sub>4</sub> for 20 min to induce oxidative stress. Fluorescent probes were used to detect and quantify oxidative stress by measuring the fluorescent intensity (FI) in larvae. FI significantly decreased in the presence of EE at 5 and 20 µg/mL, demonstrating EE’s profound antioxidant effects, reducing or preventing oxidative stress from CuSO<sub>4</sub>. Moreover, the co-administration of EE also protected zebrafish larvae against oxidative damage from CuSO<sub>4</sub> through down-regulation of <i>hsp70</i> and <i>gadd45bb</i> expression and upregulation of <i>sod</i>. Due to copper accumulation in zebrafish tissues, the damage and oxidative stress were exacerbated overtime, resulting in the upregulation of genes related to inflammatory processes such as <i>cox-2</i>, <i>pla2</i>, <i>c3a</i>, <i>mpo</i>, and pro- and anti-inflammatory cytokines (<i>il-1ß</i>, <i>il-8</i>, <i>tnf-α</i>, and <i>il-10</i>, respectively). However, the association of CuSO<sub>4</sub> with EE significantly decreased the expression of <i>cox-2</i>, <i>pla2</i>, <i>c3a</i>, <i>mpo</i>, <i>il-8</i>, and <i>il-1ß</i>. Taken together, the results suggest that EE has potent antioxidant and anti-inflammatory activities and may be useful in the treatment of various inflammatory diseases.
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