Although lipid phosphoric acid mediators such as lysophosphatidic acid (LPA) are now recognized widely as intercellular signaling molecules, the medicinal chemistry of these mediators is poorly developed. With the goal of achieving a better understanding of the structure activity relationships in LPA, we have synthesized and tested a series of LPA analogs that lack the 2-hydroxyl moiety. Our series consisted of compounds with 2, 3, or 4 carbon diol or amino alcohol backbones and oleoyl or palmitoleoyl acyl groups. These molecules cannot be acylated further to form phosphatidic acids, nor do they have chiral centers. The rank order potency of these compounds in mobilization of calcium in MDA MB-231 cells suggested a maximum optimal chain length of 24–25 atoms. However, high potency for the inhibition of adenylyl cyclase in these cells was achieved only by one compound that also contained a dissociable proton five bond lengths from the phosphorus atom. That compound, N -oleoyl-2-hydroxyethyl-1-phosphate, was nearly equipotent to 1-oleoyl LPA in both assays. The striking mimicry of LPA by the ethanolamine-based compound and the presence of fatty acid amides in tissue prompts us to propose that phosphorylated N -acyl ethanolamides occur naturally.
尽管脂
磷酸类介质如
溶血磷脂酸(LPA)现已被广泛认可为细胞间信号分子,但这些介质的药物
化学研究尚处于起步阶段。为了更好地理解LPA结构活性关系,我们合成并测试了一系列缺乏2-羟基部分的LPA类似物。我们的研究系列包括具有2、3或4个
碳的二醇或
氨基醇骨架以及油酰或
棕榈油酰酰基的化合物。这些分子不能进一步酰化形成
磷脂酸,也不具有手性中心。这些化合物在
MDA MB-231细胞中动员
钙的活性排序提示了最大最佳链长度为24-25个原子。然而,在这些细胞中抑制
腺苷酸环化酶的高效活性仅由一种化合物实现,该化合物在
磷原子五键长度处含有一个可解离的质子。该化合物,即N-油酰-2-羟乙基-1-
磷酸,在两种检测中与1-油酰LPA几乎等效。基于这种以
乙醇胺为
基础的化合物对LPA的惊人模拟及组织中
脂肪酸酰胺的存在,我们推测自然界中存在
磷酸化的N-酰基
乙醇酰胺。