Isoquercetin (Synonyms: NSC 115918, Quercetin 3-β-D-glucoside, Quercetin 3-O-glucoside)

Isoquercetin (Quercetin 3-glucoside) is a naturally occurring polyphenol that has antioxidant, anti-proliferative, and anti-inflammatory properties. Isoquercetin alleviates ethanol-induced hepatotoxicity, oxidative stress, and inflammatory responses via the Nrf2/ARE antioxidant signaling pathway[1]. Isoquercetin regulates the expression of nitric oxide synthase 2 (NO2) via modulating the nuclear factor-κB (NF-κB) transcription regulation system. Isoquercetin has high bioavailability and low toxicity, is a promising candidate agent to prevent birth defects in diabetic pregnancies[2].

Isoquercetin (Quercetin 3-glucoside; 5-20 μM; 24 hours) substantially reduces ethanol-induced cytotoxicity , protects hepatic cells against ethanol-stimulated liver injury[1].Isoquercetin (10 μM; pre-treat 1 hour) dramatically downregulates the levels of ethanol-induced iNOS protein expression in HepG2 cells[1].

References:
[1]. Lee S, et al. Relative protective activities of quercetin, quercetin-3-glucoside, and rutin in alcohol-induced liver injury. J Food Biochem. 2019 Aug 5:e13002.
[2]. Tan C, et al. Modulation of nuclear factor-κB signaling and reduction of neural tube defects by quercetin-3-glucoside in embryos of diabetic mice. Am J Obstet Gynecol. 2018 Aug;219(2):197.e1-197.e8.