Transport of the highly charged myo-inositol hexakisphosphate molecule across the red blood cell membrane: a phase transfer and biological study
作者:Stéphane P Vincent、Jean-Marie Lehn、Jaime Lazarte、Claude Nicolau
DOI:10.1016/s0968-0896(02)00162-1
日期:2002.9
To address the problem or delivering highly charged small molecules, Such as phytic acid (InsP(6) or IHP), across biological membranes, we investigated an approach based on a non-covalent interaction between transport molecule(s) and IHP. Thus, we synthesized a collection of compounds containing IHP ionically bound to lipophilic (but non-lipidic) ammonium or poly-ammonium cations. First, we assessed the ability of these water-soluble salts to cross a biological membrane by measuring partition coefficients between human serum and I-octanol. In view of the ability of IHP to act as potent effector for oxygen release, the O-2-hemoglobin dissociation Curves were then measured for the most efficient salts on whole blood. From both the biological and the physical properties of IHP-ammoniums salts e determined that cycloalkylamines (or poly-amines) were the best transport molecules, especially cycloheptyl- and cyclooctylamine. Indeed, the octanol/serum partition coefficient of IHP undecacycloocty-lammonium salt, is superior to 1, which is very favorable for potential uptake into the red blood cell membrane. A qualitative correlation was found between the partitioning experiments and the biological evaluations performed on whole blood. (C) 2002 Elsevier Science Ltd. All rights reserved.