Fatty Alcohol Phosphates are Subtype-Selective Agonists and Antagonists of Lysophosphatidic Acid Receptors
作者:Tamas Virag、Don B. Elrod、Karoly Liliom、Vineet M. Sardar、Abby L. Parrill、Kazuaki Yokoyama、Gangadhar Durgam、Wenlin Deng、Duane D. Miller、Gabor Tigyi
DOI:10.1124/mol.63.5.1032
日期:2003.5.1
A more complete understanding of the physiological and pathological role of lysophosphatidic acid (LPA) requires receptor subtype-specific agonists and antagonists. Here, we report the synthesis and pharmacological characterization of fatty alcohol phosphates (FAP) containing saturated hydrocarbon chains from 4 to 22 carbons in length. Selection of FAP as the lead structure was based on computational modeling as a minimal structure that satisfies the two-point pharmacophore developed earlier for the interaction of LPA with its receptors. Decyl and dodecyl FAPs (FAP-10 and FAP-12) were specific agonists of LPA2 (EC50 = 3.7 ± 0.2 μM and 700 ± 22 nM, respectively), yet selective antagonists of LPA3 ( K i = 90 nM for FAP-12) and FAP-12 was a weak antagonist of LPA1. Neither LPA1 nor LPA3 receptors were activated by FAPs; in contrast, LPA2 was activated by FAPs with carbon chains between 10 and 14. Computational modeling was used to evaluate the interaction between individual FAPs (8 to 18) with LPA2 by docking each compound in the LPA binding site. FAP-12 displayed the lowest docked energy, consistent with its lower observed EC50. The inhibitory effect of FAP showed a strong hydrocarbon chain length dependence with C12 being optimum in the Xenopus laevis oocytes and in LPA3-expressing RH7777 cells. FAP-12 did not activate or interfere with several other G-protein-coupled receptors, including S1P-induced responses through S1P1,2,3,5 receptors. These data suggest that FAPs are ligands of LPA receptors and that FAP-10 and FAP-12 are the first receptor subtype-specific agonists for LPA2.
对溶血磷脂酸(LPA)的生理和病理作用进行更全面的理解,需要针对不同受体亚型的激动剂和拮抗剂。本文报道了含有4至22个碳的饱和碳氢链的脂肪醇磷酸盐(FAP)的合成和药理学特性。选择FAP作为主要结构是基于计算模型,该模型以满足先前为LPA与其受体相互作用而开发的两点药效团的最小结构为基础。癸基和十二烷基FAP(FAP-10和FAP-12)分别是LPA2的特异性激动剂(EC50分别为3.7±0.2μM和700±22nM),同时也是LPA3的选择性拮抗剂(FAP-12的K i为90nM),而FAP-12对LPA1是弱的拮抗剂。FAP既不能激活LPA1也不能激活LPA3受体;相反,LPA2被含10至14个碳链的FAP激活。通过计算模拟,将每个化合物对接在LPA结合位点,来评估单个FAP(8至18)与LPA2的相互作用。FAP-12显示最低的对接能,与其较低的观察EC50一致。FAP的抑制效应显示出强烈的碳氢链长度依赖性,在非洲爪蟾卵母细胞和表达LPA3的RH7777细胞中,C12是最适长度。FAP-12未激活或干扰包括S1P1,2,3,5受体介导的S1P反应在内的几个其他G蛋白偶联受体。这些数据表明FAP是LPA受体的配体,且FAP-10和FAP-12是首批针对LPA2受体亚型的特异性激动剂。