NMR studies of interactions of new CB2 cannabinoid receptor ligands with cyclodextrins hosts. Correlation with micellar electrokinetic chromatography and reversed phase high performance liquid chromatography
作者:Nathalie Azaroual、Jamal El Bakali、Delphine Broc、Carole Deghaye、Amaury Farce、Philippe Chavatte、Régis Millet、Claude Vaccher、Emmanuelle Lipka-Belloli
DOI:10.1007/s10847-013-0295-0
日期:2014.4
Three selective CB2 cannabinoid receptor ligands have recently been discovered to be promising anti-inflammatory agents but their low water solubility hinder their per os administration. The popularity of the cyclodextrins, from a pharmaceutical standpoint lies on their ability to interact with poorly water-soluble drugs and improve their solubility. Herein, three experimental approaches for calculating the stability constant of complexes between the selective CB2 ligands and either the β-CD or the HP-β-CD, were tested: nuclear magnetic resonance, micellar electrokinetic chromatography and high performance liquid chromatography in reversed phase. In NMR studies the calculated K values were relatively high and were between 1486 and 3571 M−1 with β-CD. With HP-β-CD they were between 1203 and 2650 M−1. Concerning the two others techniques the K values were found lower. In MECK studies with β-CD they were between 308 and 792 M−1 and with HP-β-CD between 124 and 764 M−1. Finally in RP-HPLC studies with β-CD, they were between 539 and 1144 M−1 and with HP-β-CD between 196 and 396 M−1. These calculated constants suggest that a complexation phenomenon occurs. A model for inclusion of one of the CB2 ligands in the β-CD was then proposed from molecular modeling studies.
最近发现的三种选择性 CB2 大麻受体配体是很有前途的抗炎药物,但它们的水溶性很低,妨碍了它们的口服给药。从制药的角度来看,环糊精的受欢迎程度在于它们能与水溶性较差的药物相互作用,提高药物的溶解度。在此,我们测试了三种计算选择性 CB2 配体与 β-CD 或 HP-β-CD 复合物稳定性常数的实验方法:核磁共振、胶束电动色谱法和反相高效液相色谱法。在核磁共振研究中,β-CD 的计算 K 值相对较高,介于 1486 和 3571 M-1 之间。HP-β-CD 的 K 值介于 1203 和 2650 M-1 之间。其他两种技术的 K 值较低。在使用 β-CD 进行的 MECK 研究中,K 值介于 308 和 792 M-1 之间;在使用 HP-β-CD 进行的 MECK 研究中,K 值介于 124 和 764 M-1 之间。最后,在与 β-CD 的 RP-HPLC 研究中,它们介于 539 和 1144 M-1 之间,而与 HP-β-CD 则介于 196 和 396 M-1 之间。这些计算常数表明存在络合现象。随后,通过分子建模研究提出了在 β-CD 中加入一种 CB2 配体的模型。