Structure−Activity Relationship for Enhancement of Paracellular Permeability across Caco-2 Cell Monolayers by 3-Alkylamido-2-alkoxypropylphosphocholines
摘要:
Paracellular permeability enhancers have been used to improve the oral bioavailability of hydrophilic drugs; however, the mechanism of action of many enhancers is poorly understood. In this study, highly potent enhancers of paracellular permeability were identified in the 3-alkylamido-2-alkoxypropylphosphocholine series, and a structure-activity relationship was developed for enhancement of paracellular permeability across Caco-2 cell monolayers. Compounds with short (<5 carbons) hydrocarbon chains at both C-2 and C-3 were generally inactive. The potency exhibited a parabolic relationship with respect to the chain length at either C-2 or C-3. Linear molecules (i.e., compounds with a short hydrocarbon chain at C-2 or C-3 and a long hydrocarbon chain on C-3 or C-2, respectively) were more potent than the corresponding branched molecules with the same carbon load. The efficacy of 3-alkylamido2-alkoxypropylphosphocholines as enhancers of paracellular permeability was not dependent on their existence in micellar form or their ability to alter the fluidity of cell membrane. Previously, a correlation-between the potency of alkylphosphocholines as enhancers of paracellular permeability and the inhibitors of phospholipase C (PLC) was established in Madine Darby canine kidney (MDCK) cell monolayers. The potencies of selected 3-alkylamido-2-alkoxypropylphosphocholines as inhibitors of PLC and enhancers of paracellular permeability fit well into this correlation. Therefore, phosphocholines are likely to increase paracellular permeability by modulating the signal transduction pathway initiated by a PLC-catalyzed reaction rather than by physically altering the cell membrane.
One‐Step Biocatalytic Synthesis of Sustainable Surfactants by Selective Amide Bond Formation**
作者:Max Lubberink、William Finnigan、Christian Schnepel、Christopher R. Baldwin、Nicholas J. Turner、Sabine L. Flitsch
DOI:10.1002/anie.202205054
日期:2022.7.25
route to commercially important surfactants is presented. A truncated construct of carboxylic acid reductase (CARmm-A) catalyzes amidebondformation between fatty acids and amino alcohols with no esterification observed. The wide substrate scope of the enzyme, co-factor recycling, reaction engineering and up-scaling show the feasibility of this method for synthesis.
提出了一种获得商业上重要的表面活性剂的酶促途径。截短的羧酸还原酶构建体 (CAR mm -A) 催化脂肪酸和氨基醇之间形成酰胺键,未观察到酯化反应。该酶的广泛底物范围、辅因子回收、反应工程和放大显示了该合成方法的可行性。
SULFUR-CONTAINING SILANE, FILLED ELASTOMERIC COMPOSITIONS CONTAINING SAME AND ARTICLES MADE THEREFROM
申请人:Momentive Performance Materials Inc.
公开号:EP2310397A1
公开(公告)日:2011-04-20
Sulfur-Containing Silane, Filled Elastomeric Compositions Containing Same And Articles Made Therefrom
申请人:Hwang Lesley
公开号:US20110021692A1
公开(公告)日:2011-01-27
Sulfur-containing silanes described herein can serve as coupling agents for fillers in elastomer compositions used, for example, in tires, belts, hoses, shoe soles, seals, gaskets, and the like. The sulfur containing silanes advantageously reduce or eliminate the generation of volatile organic compounds (VOCs) during use.
Structure−Activity Relationship for Enhancement of Paracellular Permeability across Caco-2 Cell Monolayers by 3-Alkylamido-2-alkoxypropylphosphocholines
作者:Hui Ouyang、Susan L. Morris-Natschke、Khalid S. Ishaq、Peter Ward、Dongzhou Liu、Sarah Leonard、Dhiren R. Thakker
DOI:10.1021/jm020001x
日期:2002.6.1
Paracellular permeability enhancers have been used to improve the oral bioavailability of hydrophilic drugs; however, the mechanism of action of many enhancers is poorly understood. In this study, highly potent enhancers of paracellular permeability were identified in the 3-alkylamido-2-alkoxypropylphosphocholine series, and a structure-activity relationship was developed for enhancement of paracellular permeability across Caco-2 cell monolayers. Compounds with short (<5 carbons) hydrocarbon chains at both C-2 and C-3 were generally inactive. The potency exhibited a parabolic relationship with respect to the chain length at either C-2 or C-3. Linear molecules (i.e., compounds with a short hydrocarbon chain at C-2 or C-3 and a long hydrocarbon chain on C-3 or C-2, respectively) were more potent than the corresponding branched molecules with the same carbon load. The efficacy of 3-alkylamido2-alkoxypropylphosphocholines as enhancers of paracellular permeability was not dependent on their existence in micellar form or their ability to alter the fluidity of cell membrane. Previously, a correlation-between the potency of alkylphosphocholines as enhancers of paracellular permeability and the inhibitors of phospholipase C (PLC) was established in Madine Darby canine kidney (MDCK) cell monolayers. The potencies of selected 3-alkylamido-2-alkoxypropylphosphocholines as inhibitors of PLC and enhancers of paracellular permeability fit well into this correlation. Therefore, phosphocholines are likely to increase paracellular permeability by modulating the signal transduction pathway initiated by a PLC-catalyzed reaction rather than by physically altering the cell membrane.
Monoacylglycerols as transmembrane Cl− anion transporters
作者:Soheila Bahmanjah、Ning Zhang、Jeffery T. Davis
DOI:10.1039/c2cc18148g
日期:——
We report that the amphiphilic natural product, monoacylglycerol 1, functions as a transmembrane Cl(-)/NO(3)(-) aniontransporter. The 1,2-diol group is crucial for the transport function since diacylglycerol and triacylglycerol analogs are not aniontransporters. Furthermore, adding another hydrogen bond donor to the glycerol head-group and perfluorination of the acyl tail gave synthetic analogs with