The synthesis of novel melphalan derivatives as potential antineoplastic agents
摘要:
Five derivatives of melphalan ((S)-4- [bis(2-chloroethyl)amino]phenylalanine), an alkylating agent presently employed as an antineoplastic in humans, were designed and synthesised as potential prodrugs. Their antitumour activity was tested against P388 leukaemia in mouse after acute intraperitoneal or oral administration and compared with that of the parent compound.
Synthesis of Metal-Chelating Lipids to Sensitize Lanthanide Ions
摘要:
Sensitization of lanthanide ions is important for lanthanide ion-based assays and sensing. To the best of our knowledge, there are very few reports of lanthanide ion sensitization after it is incorporated into the liposome surface. This paper describes the syntheses of several saturated and polymerizable metal-chelating lipids based on chelidamic acid. The lipids are synthesized either from (S)-ornithine or racemic 2,3-diaminopropanoic acid. These lipids as well as polymerized liposomes incorporating these lipids sensitize lanthanide ions. Liposomes from the lipid 18-Eu3+ provided a probe that relies not only on the emission wavelengths of Eu3+ but also on a reproducible lifetime that can be used for protein identification.
temperature–pressure phase diagram and thermodynamic quantities of the phasetransitions of the DPADPC bilayermembrane were compared with those of bilayermembranes of hydrophobic chain-linkage isomers, ester-liked dipalmitoylphosphatidylcholine (DPPC) and ether-linked dihexadecylphosphatidylcholine (DHPC). The thermodynamic quantities of the main transition for these PC bilayermembranes were similar to
Synthesis, in vitro transfection activity and physicochemical characterization of novel N,N′-diacyl-1,2-diaminopropyl-3-carbamoyl-(dimethylaminoethane) amphiphilic derivatives
作者:Ahmad Aljaberi、Pensung Chen、Michalakis Savva
DOI:10.1016/j.chemphyslip.2004.09.017
日期:2005.2
A novel series of NN'-diacyl-1,2-diaminopropyl-3-carbamoyl-(dimethylaminoethane) cationic derivatives was synthesized and screened for in vitro transfection activity at different charge ratios in the presence and absence of the helper lipids DOPE and cholesterol. Physicochemical properties of lipid-DNA complexes were studied by gel electrophoresis, fluorescence spectroscopy and dynamic light scattering. The interfacial properties of the lipids in isolation were studied using the Langmuir film balance technique at 23 degreesC. It was found that only lipoplexes formulated with the dioleoyl derivative, 1,21mt[5], mediated significant in vitro transfection activity. Optimum activity was obtained with 1,21mt[5]/DOPE mixture at a +/-charge ratio of 2. In agreement with the transfection results, 1,21mt[5] was the only lipid found to complex and retard DNA migration as verified by gel electrophoresis. Despite the efficient complexation, no significant condensation of plasmid DNA was observed as indicated by fluorescence spectroscopy measurements. Monolayer studies showed that the dioleoyl derivative 1,21mt[5] was the only lipid that existed in an all liquid-expanded state with a collapse area and collapse pressure of 59.5 Angstrom(2) and 38.7 mN/m, respectively. This lipid was also found to have the highest elasticity with a compressibility modulus at monolayer collapse of 80.4 mN/m. In conclusion, increased acyl chain fluidity and high molecular elasticity of cationic lipids were found to correlate with improved transfection activity. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
The synthesis of novel melphalan derivatives as potential antineoplastic agents
作者:A.D. Morris、G Atassi、N Guilbaud、A.A. Cordi
DOI:10.1016/s0223-5234(97)89087-3
日期:1997.1
Five derivatives of melphalan ((S)-4- [bis(2-chloroethyl)amino]phenylalanine), an alkylating agent presently employed as an antineoplastic in humans, were designed and synthesised as potential prodrugs. Their antitumour activity was tested against P388 leukaemia in mouse after acute intraperitoneal or oral administration and compared with that of the parent compound.
Synthesis of Metal-Chelating Lipids to Sensitize Lanthanide Ions
作者:Bidhan C. Roy、Marina Santos、Sanku Mallik、Andres D. Campiglia
DOI:10.1021/jo026833k
日期:2003.5.1
Sensitization of lanthanide ions is important for lanthanide ion-based assays and sensing. To the best of our knowledge, there are very few reports of lanthanide ion sensitization after it is incorporated into the liposome surface. This paper describes the syntheses of several saturated and polymerizable metal-chelating lipids based on chelidamic acid. The lipids are synthesized either from (S)-ornithine or racemic 2,3-diaminopropanoic acid. These lipids as well as polymerized liposomes incorporating these lipids sensitize lanthanide ions. Liposomes from the lipid 18-Eu3+ provided a probe that relies not only on the emission wavelengths of Eu3+ but also on a reproducible lifetime that can be used for protein identification.