Synthesis and Biophysical Characterization of Chlorambucil Anticancer Ether Lipid Prodrugs
摘要:
The synthesis and biophysical characterization of four prodrug ether phospholipid conjugates are described. The lipids are prepared from the anticancer drug chlorambucil and have C16 and C18 ether chains with phosphatidylcholine or phosphatidylglycerol headgroups. All four prodrugs have the ability to form unilamellar liposomes (86-125 nm) and are hydrolyzed by phospholipase A(2), resulting in chlorambucil release. Liposomal formulations of prodrug lipids displayed cytotoxicity toward HT-29, MT-3, and ES-2 cancer cell lines in the presence of phospholipase A(2), with IC50 values in the 8-36 mu M range.
Synthesis and Biological Activity of Anticancer Ether Lipids That Are Specifically Released by Phospholipase A2 in Tumor Tissue
摘要:
The clinical use of anticancer lipids is severely limited by their ability to cause lysis of red blood cells prohibiting intravenous injection. Novel delivery systems are therefore required in order to develop anticancer ether lipids (AELs) into clinically useful anticancer drugs. In a recent article (J. Med. Chem. 2004, 4 7, 1694) we showed that it is possible to construct liposome systems composed of masked AELs that are activated by secretory phospholipase A(2) in cancerous tissue. We present here the synthesis of six AELs and evaluate the biological activity of these bioactive lipids. The synthesized AEL 1-6 were tested against three different cancer cell lines. It was found that the stereochemistry of the glycerol headgroup in AEL-2 and 3 has a dramatic effect on the cytotoxicity of the lipids. AEL 1-4 were furthermore evaluated for their ability to prevent phosphorylation of the apoptosis regulating kinase Akt, and a correlation was found between their cytotoxic activity and their ability to inhibit Akt phosphorylation.
On the synthesis of platelet-activating factor via acetylation of 1-alkyl-sn-glycero-3-phosphocholine. Formation of structural isomer of PAF in the presence of bases
shown that platelet-activatingfactor (PAF) specimens prepared viaacetylation of 1-alkyl-sn-glycero-3-phosphocholine (lyso-PF) with acetic anhydride are heterogeneous. The contaminated compound was isolated and identified to be the structuralisomer of PAF, 1-alkyl-3-acetyl-sn-glycero-2-phosphocholine (iso-PAF). It appeared, that iso-PAF is formed when performing the reaction in the presence of organic
Synthese von Glyceryl�therphosphatiden 1. Mitteilung Herstellung von 1-O-Octadecyl-2-O-acetyl-sn-glyceryl-3-phosphorylcholin1 (?Platelet Activating Factor?), des Enantiomeren sowie einiger analoger Verbindungen
作者:Georges Hirth、Richard Barner
DOI:10.1002/hlca.19820650339
日期:1982.5.5
Synthesis of Glyceryletherphosphatides, 1st Communication, Preparation of 1-O-Octadecyl-2-O-acetyl-sn-glyceryl-3-phosphorylcholine (‘PlateletActivatingFactor’), of its Enantiomer and of Some Analogous Compounds
Acetyl glyceryl ether phosphorylcholines (platelet-activating factors ; PAFs), their enantiomers, and their analogues were efficiently synthesized in a stereochemically unambiguous manner starting from D-and L-tartaric acids as chiral synthons. The enantiomer of C16-PAF (S-comfiguration) showed far less activity than the natural PAF (R-configuration), and the N-methylpiperidine and N-methylpyrrolidine analogues were found to possess much higher activity than natural C16-PAF.
Resolution of oxiranes. Application to the synthesis of the platelet aggregation factor
作者:Bernard Cimetiere、Laurent Jacob、Marc Julia
DOI:10.1016/s0040-4039(00)87800-4
日期:1986.1
Resolution of racemic oxiranes has been achieved through their conversion into hydroxy sulfoniumsalts of dibenzoyltartaric acid. Thus, resolution of n-octadecyl glycidyl ether followed by reaction with phosphorylcholine and acetylation led to C18-P.A.F.
An efficient synthesis of platelet-activating factor (PAF) 1--alkyl-2--(3-isoxazolyl)--glycero-3-phosphocholine, a new PAF agonist utilization of the 3-isoxazolyloxy group as a protected hydroxyl.
Potent PAF agonists (R)-3a,b were synthesized and converted into PAF. Key steps include Mitsunobu reaction of a chiral secondary alcohol with 3-hydroxyisoxazole as the acidic component, and hydrogenolytic ring cleavage of the resulting 3-isoxazolyloxy group into the inverted alcohol.