Synthesis and pharmacological evaluation of bivalent antagonists of the nociceptin opioid receptor
摘要:
Bivalent ligands constituted by two identical pharmacophores structurally related to the Nociceptin Opioid Receptor (NOPr) antagonist JTC-801 were synthesized and their binding affinities for NOPr were evaluated. The novel ligands are formed by two modified JTC-801 units linked by di-iminic and di-aminic spacers with length ranging from three to ten methylene units. Moreover, the synthesis and the pharmacological characterization were extended to the corresponding univalent ligands. The latter compounds consisted in a single modified JTC-801 unit and an alkyl or alkylamino or alkylimino tail. The purpose of this study is to feature the location and surroundings of the allosteric binding site(s) of pharmacophores containing the 4-aminoquinoline structure. Most important, the bivalent ligands were exploited to reveal the eventual occurrence of a supramolecular receptorial architecture of the NOPr.All the bivalent derivatives 4 and 5 proved to be active in the nanomolar range with no outstanding dependence on the chain length. They showed potencies from three to ten times higher than the corresponding monomers. Consequently, results clearly indicated a positive role of the second pharmacophore in the ligand-protein interaction. The pharmacological profile of I he monomers 7 and 8 clarified the contribution of the linker chain to NOP receptor affinity and suggested the presence of a lipophilic acidic site neighbouring the binding site of the JTC-like ligands.Selectivity of saturated compounds 5, 7, and 8 was tested by binding experiments on delta, kappa and mu opioid receptors. Results indicated a general loss of selectivity as compared to JTC-801. In the [(35)S]GTP gamma S binding assay, all the compounds revealed antagonistic properties at the NOP Receptor.In conclusion the present study set the basis for a systematic investigation on the structural modifications that can be introduced into novel ligands for NOPr and helped to feature the surrounds of the allosteric site of NOPr. (C) 2011 Elsevier Masson SAS. All rights reserved.
We are presenting the synthesis of a phenylene ethynylene-based rod containing an Fmoc protected amino group and an activated acid which can be applied to peptide couplings. This linear amino acid analogue is applied to the synthesis of di-, tri- and pentamers. The pentamer has a molecular mass of 6.5 kDa and is characterized by 1H NMR spectroscopy and MALDI-TOF MS. The method has potential for the
我们提出了一种含有Fmoc保护的氨基和可用于肽偶联的活化酸的亚苯基乙炔基棒的合成。该线性氨基酸类似物用于二,三和五聚体的合成。五聚体的分子量为6.5 kDa,并通过1 H NMR光谱和MALDI-TOF MS进行表征。该方法具有形成长大分子低聚物的潜力。
Triphenylbutanamines: Kinesin Spindle Protein Inhibitors with in Vivo Antitumor Activity
作者:Fang Wang、James A. D. Good、Oliver Rath、Hung Yi Kristal Kaan、Oliver B. Sutcliffe、Simon P. Mackay、Frank Kozielski
DOI:10.1021/jm201195m
日期:2012.2.23
The human mitotic kinesin Eg5 represents a novel mitotic spindle target for cancer chemotherapy. We previously identified S-trityl-L-cysteine (STLC) and related analogues as selective potent inhibitors of Eg5. We herein report on the development of a series of 4,4,4-triphenylbutan-1-amine inhibitors derived from the STLC scaffold. This new generation systematically improves on potency: the most potent C-trityl analogues exhibit K-i(aPP) <= 10 nM and GI(50) approximate to 50 nM, comparable to results from the phase II clinical benchmark ispinesib. Crystallographic studies reveal that they adopt the same overall binding configuration as S-trityl analogues at an allosteric site formed by loop L5 of Eg5. Evaluation of their druglike properties reveals favorable profiles for future development and, in the clinical candidate ispinesib, moderate hERG and CYP inhibition. One triphenylbutanamine analogue and ispinesib possess very good bioavailability (51% and 45%, respectively), with the former showing in vivo antitumor growth activity in nude mice xenograft studies.
Synthesis and SAR of 99mTc/Re-labeled small molecule prostate specific membrane antigen inhibitors with novel polar chelates
作者:Genliang Lu、Kevin P. Maresca、Shawn M. Hillier、Craig N. Zimmerman、William C. Eckelman、John L. Joyal、John W. Babich
DOI:10.1016/j.bmcl.2012.09.014
日期:2013.3
Prostate specific membrane antigen (PSMA) is recognized as an attractive molecular target for the development of radiopharmaceuticals to image and potentially treat metastatic prostate cancer. A series of novel Tc-99m/Re-tricarbonyl radiolabeled PSMA inhibitors were therefore synthesized by the attachment of glutamate-urea-lysine (Glu-urea-Lys) and glutamate-urea-glutamate (Glu-urea-Glu) pharmacophore to single amino acid chelate (SAAC) where the SAAC ligand was either bis(pyridin-2-ylmethyl)amino (DPA), bis((1-methyl-1H-imidazol-2-yl)methyl)amino (NMI), bis((1-(carboxymethyl)-1H-imidazol-2-yl)methyl)amino (CIM) or bis((1-(2-(bis(carboxymethyl)amino)-2-oxoethyl)-1H-imidazol-2-yl)methyl)amino (TIM). The in vitro binding affinity of the rhenium complexes was evaluated using PSMA-expressing human prostate cancer LNCaP cells. IC50 values ranged from 3.8 +/- 2 to > 2000 nM. A linker between the SAAC chelate and pharmacophore was required for high affinity binding. However, extending the length of the linker did not substantially improve binding. PSMA binding was also influenced by the nature of the SAAC chelate. One of the most potent compounds, 23b (IC50 = 4.8 +/- 2.7 nM), was radiolabeled with technetium tricarbonyl (Tc-99m(CO)(3)}(+)) to afford the Tc-99m(CO)(3)}(+) complex in excellent yield and high purity. This effort has led to the identification of a diverse series of promising high affinity Tc-99m(CO)(3)}(+) radiolabeled PSMA inhibitors. (c) 2012 Elsevier Ltd. All rights reserved.