Synthesis, radiosynthesis and biological evaluation of 1,4-dihydroquinoline derivatives as new carriers for specific brain delivery
作者:Lénaïg Foucout、Fabienne Gourand、Martine Dhilly、Pierre Bohn、Georges Dupas、Jean Costentin、Ahmed Abbas、Francis Marsais、Louisa Barré、Vincent Levacher
DOI:10.1039/b909650g
日期:——
In spite of numerous reports dealing with the use of 1,4-dihydropyridines as carriers to deliver biological active compounds to the brain, this chemical delivery system (CDS) suffers from poor stability of the 1,4-dihydropyridine derivatives towards oxidation and hydration reactions seriously limiting further investigations in vivo. In an attempt to overcome these limitations, we report herein the first biological evaluation of more stable annellated NADH models in the quinoline series as relevant neuroactive drug-carrier candidates. The radiolabeled 1,4-dihydroquinoline [11C]1a was prepared to be subsequently peripherally injected in rats. The injected animals were sacrificed and brains were collected. The radioactivity measured in rat brain indicated a rapid penetration of the carrier [11C]1a into the CNS. HPLC analysis of brain homogenates showed that oxidation of [11C]1a into the corresponding quinolinium salt [11C]4a was completed in less than 5 min. An in vivo evaluation in mice is also reported to illustrate the potential of such 1,4-dihydroquinoline derivatives to transport a neuroactive drug in the CNS. For this purpose, γ-aminobutyric acid (GABA), well known to poorly cross the brain blood barrier (BBB) was connected to this 1,4-dihydroquinoline-type carrier. After i.p. injection of 1,4-dihydroquinoline-GABA derivative 1b in mice, a significant alteration of locomotor activity (LMA) was observed presumably resulting from an enhancement of central GABAergic activity. These encouraging results give strong evidence for the capacity of carrier-GABA derivative 1b to cross the BBB and exert a pharmacological effect on the CNS. This study paves the way for further progress in designing new redox chemical delivery systems.
尽管有许多关于使用1,4-二氢吡啶作为载体将生物活性化合物递送至大脑的报道,但这种化学递送系统(CDS)受到1,4-二氢吡啶衍生物对氧化和水合反应稳定性差的严重限制,从而限制了体内进一步研究。为了克服这些限制,我们在此首次报道了更稳定的环联式NADH模型在喹啉系列中的生物学评估,这些模型作为相关的神经活性药物载体候选物。制备了放射性标记的1,4-二氢喹啉[11C]1a以随后在 rats 中进行外周注射。注射的动物被牺牲并收集大脑。在 rat 大脑中测得的放射活性表明载体[11C]1a快速渗透至中枢神经系统(CNS)。对脑组织匀浆的高效液相色谱(HPLC)分析显示,[11C]1a氧化为相应的喹啉盐[11C]4a的过程在不到5分钟内完成。还报道了在 mice 中的体内评估,以说明这类1,4-二氢喹啉衍生物在CNS中运输神经活性药物的潜力。为此目的,将 γ-氨基丁酸(GABA)——因其难以穿越血脑屏障(BBB)而闻名——连接到这种1,4-二氢喹啉型载体上。在 mice 中腹腔注射1,4-二氢喹啉-GABA衍生物1b后,观察到运动活动(LMA)的显著改变,这可能是由于中枢GABA能活性的增强所致。这些令人鼓舞的结果为1b载体-GABA衍生物穿越BBB并在CNS中发挥药理作用的能力提供了有力证据。这项研究为设计新的氧化还原化学递送系统开辟了道路。