Conjugation of 2-(1′-Hexyloxyethyl)-2-devinylpyropheophorbide-a (HPPH) to Carbohydrates Changes its Subcellular Distribution and Enhances Photodynamic Activity in Vivo

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• 作者：Xiang Zheng ; Janet Morgan ; Suresh K. Pandey ; Yihui Chen ; Erin Tracy ; Heinz Baumann ; Joseph R. Missert ; Carrie Batt ; Jennifer Jackson ; David A. Bellnier ; Barbara W. Henderson ; Ravindra K. Pandey
• 刊名：Journal of Medicinal Chemistry
• 出版年：2009
• 出版时间：July 23, 2009
• 年：2009
• 卷：52
• 期：14
• 页码：4306-4318
• 全文大小：1086K
• 年卷期：v.52,no.14(July 23, 2009)
• ISSN：1520-4804

文摘

The carbohydrate moieties on conjugating with 3-(1′-hexyloxyethyl)-3-devinyl pyropeophorbide-a (HPPH) altered the uptake and intracellular localization from mitochondria to lysosomes. In vitro, HPPH-Gal 9 PDT showed increased PDT efficacy over HPPH−PDT as detectable by the oxidative cross-linking of nonphosphorylated STAT3 and cell killing in ABCG2-expressing RIF cells but not in ABCG2-negative Colon26 cells. This increased efficacy in RIF cells could at least partially be attributed to increased cellular accumulation of 9, suggesting a role of the ABCG2 transporter for which HPPH is a substrate. While such differences in the accumulation in HPPH derivatives by tumor tissue in vivo were not detectable, 9 still showed an elevated light dose-dependent activity compared to HPPH in mice bearing RIF as well as Colon26 tumors. Further optimization of the carbohydrate conjugates at variable treatment parameters in vivo is currently underway.