Synthesis of tocopheryl succinate phospholipid conjugates and monitoring of phospholipase A2 activity
摘要:
Tocopheryl succinates (TOSs) are, in contrast to tocopherols, highly cytotoxic against many cancer cells. In this study the enzyme activity of secretory phospholipase A(2) towards various succinate-phospholipid conjugates has been investigated. The synthesis of six novel phospholipids is described, including two TOS phospholipids conjugates. The studies revealed that the TOS conjugates are poor substrates for the enzyme whereas the phospholipids with alkyl and phenyl succinate moieties were hydrolyzed by the enzyme to a high extent. (C) 2012 Elsevier Ltd. All rights reserved.
Synthesis and Stability Studies of α,α-Difluoro Ester Phospholipids
作者:Palle J. Pedersen、Thomas L. Andresen、Mads H. Clausen
DOI:10.1002/ejoc.201200565
日期:2012.10.18
The synthesis of two new α,α-difluoro ester phospholipid conjugates is described and the stability of their liposomal formulations in three different aqueous buffers (pH 4.5, 7.5 and 8.5) has been investigated. The studies confirmed that α,α-difluoro esters are much more prone to hydrolysis when positioned close to the hydrophilic headgroup of phospholipids than when the functionality is placed in
Liposomal Formulation of Retinoids Designed for Enzyme Triggered Release
作者:Palle J. Pedersen、Sidsel K. Adolph、Arun K. Subramanian、Ahmad Arouri、Thomas L. Andresen、Ole G. Mouritsen、Robert Madsen、Mogens W. Madsen、Günther H. Peters、Mads H. Clausen
DOI:10.1021/jm100190c
日期:2010.5.13
The design of retinoid phospholipid prodrugs is described based on molecular dynamics simulations and cytotoxicity studies of synthetic retinoid esters. The prodrugs are degradable by secretory phospholipase A(2) IIA and have potential in liposomal drug delivery targeting tumors. We have synthesized four different retinoid phospholipid prodrugs and shown that they form particles in the liposome size region with average diameters of 94-118 nm. Upon subjection to phospholipase A(2), the lipid prodrugs were hydrolyzed, releasing cytotoxic retinoids and lysolipids. The formulated lipid prodrugs displayed IC50 values in the range of 3-19 mu M toward HT-29 and Colo205 colon cancer cells in the presence of phospholipase A(2), while no significant cell death was observed in the absence of the enzyme.