Modulation of Melphalan Resistance in Glioma Cells with a Peripheral Benzodiazepine Receptor Ligand−Melphalan Conjugate
摘要:
Peripheral benzodiazepine receptors (PBRs) are located on the outer membrane of mitochondria, and their density is increased in brain tumors. Thus, they may serve as a unique intracellular and selective target for antineoplastic agents. A PBR ligand-melphalan conjugate (PBR-MEL) was synthesized and evaluated for cytotoxicity and affinity for PBRs. PBR-MEL (9) (i.e., 670 amu) was synthesized by coupling of two key intermediates: 4-[bis(2-chloroethyl)amino]-L-phenylalanine ethyl ester trifluoroacetate (6) and 1-(3'-carboxylpropyl)-7-chloro-1,3-dihydro-5-phenyl-2H-1,4-benzodiazepin-2-one (8). On the basis of receptor-binding displacement assays in rat brain and glioma cells, 9 had appreciable binding affinity and displaced a prototypical PBR ligand, Ro 5-4864, with IC50 values between 289 and 390 nM. 9 displayed differential cytotoxicity to a variety of rat and human brain tumor cell lines. In some of the cell lines tested including rat and human melphalan-resistant cell lines, 9 demonstrated appreciable cytotoxicity with IC50 values in the micromolar range, lower than that of melphalan alone. The enhanced activity of 9 may reflect increased membrane permeability, increased intracellular retention, or modulation of melphalan's mechanisms of resistance. The combined data support additional studies to determine how 9 may modulate melphalan resistance, its mechanisms of action, and if target selectivity can be achieved in in vivo glioma models.
N-acylamino acid amide compounds and intermediates for preparation thereof
申请人:Ube Industries, Ltd.
公开号:US06265418B1
公开(公告)日:2001-07-24
The present invention discloses the compound represented by the formula (I):
wherein A represents the following formula (a-1) or the following formula (a-2):
B represents the following formula (b):
(wherein the symbols are each as defined in the specification) or a pharmaceutically acceptable salts thereof, and intermediates for the preparation thereof, which have excellent platelet aggregation inhibitory activity and other properties and useful as prophylactic or therapeutic agents for diseases associated with a fibrinogen receptor, thrombosis, infarction and the like.
[EN] VLA-4 ANTAGONISTS<br/>[FR] ANTAGONISTES DE VLA-4
申请人:MERCK & CO INC
公开号:WO2005087760A1
公开(公告)日:2005-09-22
Compounds of Formula I are antagonists of VLA-4, and as such are useful in the inhibition or prevention of cell adhesion and cell-adhesion mediated pathologies. These compounds may be formulated into pharmaceutical compositions and are suitable for use in the treatment of inflammatory bowel disease including ulcerative colitis and Crohn’s disease, multiple sclerosis, asthma, and rheumatoid arthritis.
Phenylalanine derivatives of formula (1) are described:
in which:
Ar1 is an aromatic or heteroaromatic group;
L1 is a linker atom or group;
R is a carboxylic acid or a derivative thereof;
Ar2 is an optionally substituted aromatic or heteroaromatic group;
and the salts, solvates, hydrates and N-oxides thereof.
The compounds are able to inhibit the binding of &agr;4 integrins to their ligands and are of use in the prophylaxis and treatment of immune or inflammatory disorders.
[EN] PROCESS FOR THE PREPARATION OF PHENYLALANINE ENAMIDE DERIVATIVES<br/>[FR] PROCEDE DE PREPARATION DE DERIVES DE PHENYLALANINE-ENAMIDE
申请人:CELLTECH R&D LTD
公开号:WO2004007428A1
公开(公告)日:2004-01-22
A process for the preparation of a class of phenylalanine enamide derivatives is described formula (1) wherein: Ar1 is an optionally substituted aromatic or heteroaromatic group; L2 is a linker group selected from -N(R4)- [where R4 is a hydrogen atom or an optionally substituted straight or branched C1-6alkyl group], -CON(R4)-, or -S(O)2N(R4)-; R1 is a carboxylic acid (-CO2H) or a derivative or biostere thereof; R2 is a hydrogen atom or a C1-6alkyl group; Rx, Ry and Rz which may be the same or different is each an atom or group -L1(Alk1)n(R3)v; and the salts, solvates, hydrates and N-oxides thereof; which comprises reacting a compound of formula (2): wherein: Qa is a group -N(R4)H; and the salts, solvates, hydrates and N-oxides thereof; with a compound Ar1W wherein W is a group selected from X1 (wherein X1 is a leaving atom or group), -COX2 (wherein X2 is a halogen atom or a -OH group) or -SO2 X3 (in which X3 is a halogen atom).
Compounds and their use in medicine, process for their preparation and pharmaceutical compositions containing them
申请人:DR. REDDY'S LABORATORIES LIMITED
公开号:US20030229083A1
公开(公告)日:2003-12-11
The present invention relates to novel antidiabetic, hypolipidemic, antiobesity and hypocholesterolemic compounds of formula (I),
1
their derivatives, their analogs, their tautomeric forms, their stereoisomers, their polymorphs, their pharmaceutically acceptable salts, their pharmaceutically acceptable solvates and pharmaceutically acceptable compositions containing them.