Enhanced Stability and Intracellular Accumulation of Quercetin by Protection of the Chemically or Metabolically Susceptible Hydroxyl Groups with a Pivaloxymethyl (POM) Promoiety

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• 作者：Mi Kyoung Kim ; Kwang-Su Park ; Chaewoon Lee ; Hye Ri Park ; Hyunah Choo ; Youhoon Chong
• 刊名：Journal of Medicinal Chemistry
• 出版年：2010
• 出版时间：December 23, 2010
• 年：2010
• 卷：53
• 期：24
• 页码：8597-8607
• 全文大小：1018K
• 年卷期：v.53,no.24(December 23, 2010)
• ISSN：1520-4804

文摘

In order to increase stability of quercetin, its metabolically and chemically susceptible hydroxyl groups 7-OH and 3-OH respectively were transiently blocked with a pivaloxymethyl (POM) promoiety to provide two novel quercetin conjugates [7-O-POM-Q (2), 3-O-POM-Q (3)]. In the absence of stabilizer (ascorbic acid), the synthesized conjugates showed significantly increased stability in cell culture media [t_1/2 = 4 h (2), 52 h (3)] compared with quercetin (t_1/2 < 30 min) and quercetin prodrug 1 (t_1/2 = 0.8 h). In addition, the quercetin conjugate 2 underwent efficient cellular uptake and intracellular levels of its hydrolysis product, quercetin, were maintained up to 12 h. Stability and intracellular accumulation of 2 were demonstrated by its stabilizer-independent cytostatic effect and induction of apoptotic cell death. Even though 3 was more stable than 2, it failed to penetrate cell membranes. However, the remarkable stability of 3 warrants further investigation of quercetin conjugates with various promoieties at the 3-OH position.