Syntheses of isotopically labeled 4-[1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethenyl]benzoic acid (LGD1069), a potent retinoid x receptor-selective ligand
作者:Lin Zhang、Beth Ann Badea、Debra Enyeart、Elaine M. Berger、Dale E. Mais、Marcus F. Boehm
DOI:10.1002/jlcr.2580360712
日期:1995.7
LGD1069, 4-[1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethenyl] benzoic acid, is the first retinoid X receptor (RXR) selective retinoid to enter clinical trials for treatment of dermatological diseases and cancer. In order to examine biological properties such as receptor binding, metabolism and bioavailability, [13C]-, [14C]-, and [3H]-labeled LGD1069 is required. Herein, we describe synthetic methods for preparing isotopically labeled homologs of LGD1069 as well as comparative competition binding data for [6,7-3H]-LGD1069 and [3H]-9-cis retinoic acid with RXR active retinoids. The final radiolabeled products, [6,7-3H]-LGD1069 and 3-[14C]-LGD1069 have specific activities of 56 Ci/mmol and 49 mCi/mmol, respectively. Radiochemical purities are 99.5% for [6,7-3H]-LGD1069 and 99.0% for 3-[14C]-LGD1069. The chemical purity is 99.0% for 3-[13CD3]-LGD1069. Competition binding studies with known retinoids show similar Kd values when either [6,7-3H]-LGD1069 or [3H]-9-cis retinoic acid is used as the radioligand.
LGD1069,4-[1-(3,5,5,8,8-五甲基-5,6,7,8-四氢-2-纳夫烯)乙烯基]苯甲酸,是首个进入临床试验的选择性维甲酸X受体(RXR)维甲酸,用于治疗皮肤病和癌症。为了研究生物特性,如受体结合、代谢和生物利用度,需要使用[13C]、[14C]和[3H]标记的LGD1069。本文描述了合成同位素标记LGD1069同系物的方法,以及[6,7-3H]-LGD1069和[3H]-9-顺维甲酸与RXR活性维甲酸的竞争结合数据的比较。最终的放射性标记产物,[6,7-3H]-LGD1069和3-[14C]-LGD1069的特定活性分别为56 Ci/mmol和49 mCi/mmol。[6,7-3H]-LGD1069的放射化学纯度为99.5%,而3-[14C]-LGD1069的放射化学纯度为99.0%。3-[13CD3]-LGD1069的化学纯度为99.0%。与已知维甲酸进行的竞争结合研究显示,当使用[6,7-3H]-LGD1069或[3H]-9-顺维甲酸作为放射性配体时,Kd值相似。