The synthesis of cholesterol-based cationic lipids with trimethylamine head and the effect of spacer structures on transfection efficiency
摘要:
Five cholesterol-based cationic lipids were newly synthesized based on cholest-5-en-3 beta-oxyethane-N,N,N-trimethylammonium bromide (Chol-ETA) structure where the cholesterol backbone is linked to cationic head via various lengths of ether-linked carbon spacer. The transfection efficiency of these compounds was increased in order of three (Chol-PRO) < four (Chol-BTA) < two (Chol-ETA) methylene unit in their spacer, and was decreased by an addition of isomethyl group to Chol-PRO spacer. In case of the presence of multiple bonds in the spacer, it required the more cationic lipids in liposome formulation than single bond in the spacer to present similar transfection efficiency. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
The synthesis of cholesterol-based cationic lipids with trimethylamine head and the effect of spacer structures on transfection efficiency
摘要:
Five cholesterol-based cationic lipids were newly synthesized based on cholest-5-en-3 beta-oxyethane-N,N,N-trimethylammonium bromide (Chol-ETA) structure where the cholesterol backbone is linked to cationic head via various lengths of ether-linked carbon spacer. The transfection efficiency of these compounds was increased in order of three (Chol-PRO) < four (Chol-BTA) < two (Chol-ETA) methylene unit in their spacer, and was decreased by an addition of isomethyl group to Chol-PRO spacer. In case of the presence of multiple bonds in the spacer, it required the more cationic lipids in liposome formulation than single bond in the spacer to present similar transfection efficiency. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.
Design and synthesis of cholesterol-derived anti-apoptotic agents were described. The synthesized cholesterol analogs designed on the structural basis of ginsenoside Rk1 inhibited the undesirable apoptosis of human endothelial cells, which are induced by a vascular injury. In particular, analogue 1 possessing 4,6di-O-acetyl-2,3-dideoxyhex-2-enopyran linked to hydroxyl group of cholesterol exhibited the most effective anti-apoptotic activities at both 5 and 10 mu g/ml. (C) 2010 Elsevier Ltd. All rights reserved.