4-Biphenyl and 2-naphthyl substituted 6,7-dimethoxytetrahydroisoquinoline derivatives as potent P-gp modulators
作者:Nicola Antonio Colabufo、Francesco Berardi、Mariangela Cantore、Maria Grazia Perrone、Marialessandra Contino、Carmela Inglese、Mauro Niso、Roberto Perrone、Amalia Azzariti、Grazia Maria Simone
DOI:10.1016/j.bmc.2008.01.055
日期:2008.4.1
this series whilst the presence of hydroxy or methoxy substituents seems to be negligible. In the naphthyl series, both the basicity and the presence of H-bond donor or acceptor groups seem to be negligible. Moreover, the lipophilicity did not influence the P-gp inhibition activity of each series. Specific biological assays have been carried out to establish the P-gp interacting mechanism of tested
A Potent and Selective P-gp Modulator for Altering Multidrug Resistance Due to Pump Overexpression
作者:Stefano Guglielmo、Marialessandra Contino、Loretta Lazzarato、Maria Grazia Perrone、Marco Blangetti、Roberta Fruttero、Nicola Antonio Colabufo
DOI:10.1002/cmdc.201500538
日期:2016.2
In this study a smalllibrary of alkyl/oxyalkyl derivatives of MC70 [4′‐(6,7‐dimethoxy‐3,4‐dihydro‐1H‐isoquinolin‐2‐ylmethyl)biphenyl‐4‐ol], a well‐known P‐gp inhibitor, was synthesized through straightforward functionalization of the phenolic group present in the structure of MC70. All compounds were characterized for their effect on P‐gp, proving capable of blocking P‐gp‐mediated calcein‐AM efflux
P-糖蛋白(P-gp)是负责主动转运几种内源性和外源性物质的膜蛋白。它构成防御机制,同时严重损害了抗肿瘤化学疗法的成功率。在这项研究中,MC70 [4'-((6,7-二甲氧基-3,4-二氢-1 H-异喹啉-2-基甲基)联苯-4-醇]的烷基/氧烷基衍生物的小型文库P-gp抑制剂是通过将MC70结构中存在的酚基团直接官能化而合成的。所有化合物均以其对P-gp的作用为特征,并证明其具有充当该转运蛋白高亲和力底物的能力,能够以微摩尔浓度阻断P-gp介导的钙黄绿素-AM流出。令人兴奋的是,化合物4[6,7-二甲氧基-2-(((4'-丁氧基联苯-4-基)甲基)-1,2,3,4-四氢异喹啉]]的纳摩尔浓度低(5.2 n m),具有独特的活性,可发挥作用既作为正构构调节剂,又作为转运蛋白的底物。还描述了MC70的新的和更有效的合成方法。
Comparison of In Vitro Assays in Selecting Radiotracers for In Vivo P-Glycoprotein PET Imaging
作者:Renske Raaphorst、Heli Savolainen、Mariangela Cantore、Evita van de Steeg、Aren van Waarde、Nicola Colabufo、Philip Elsinga、Adriaan Lammertsma、Albert Windhorst、Gert Luurtsema
DOI:10.3390/ph10030076
日期:——
Positron emission tomography (PET) imaging of P-glycoprotein (P-gp) in the blood-brain barrier can be important in neurological diseases where P-gp is affected, such as Alzheimer´s disease. Radiotracers used in the imaging studies are present at very small, nanomolar, concentration, whereas in vitro assays where these tracers are characterized, are usually performed at micromolar concentration, causing often discrepant in vivo and in vitro data. We had in vivo rodent PET data of [11C]verapamil, (R)-N-[18F]fluoroethylverapamil, (R)-O-[18F]fluoroethyl-norverapamil, [18F]MC225 and [18F]MC224 and we included also two new molecules [18F]MC198 and [18F]KE64 in this study. To improve the predictive value of in vitro assays, we labeled all the tracers with tritium and performed bidirectional substrate transport assay in MDCKII-MDR1 cells at three different concentrations (0.01, 1 and 50 µM) and also inhibition assay with P-gp inhibitors. As a comparison, we used non-radioactive molecules in transport assay in Caco-2 cells at a concentration of 10 µM and in calcein-AM inhibition assay in MDCKII-MDR1 cells. All the P-gp substrates were transported dose-dependently. At the highest concentration (50 µM), P-gp was saturated in a similar way as after treatment with P-gp inhibitors. Best in vivo correlation was obtained with the bidirectional transport assay at a concentration of 0.01 µM. One micromolar concentration in a transport assay or calcein-AM assay alone is not sufficient for correct in vivo prediction of substrate P-gp PET ligands.
Synthesis and Preclinical Evaluation of Three Novel Fluorine-18 Labeled Radiopharmaceuticals for P-Glycoprotein PET Imaging at the Blood–Brain Barrier
作者:Heli Savolainen、Mariangela Cantore、Nicola A. Colabufo、Philip H. Elsinga、Albert D. Windhorst、Gert Luurtsema
DOI:10.1021/mp5008103
日期:2015.7.6
function, many positron emission tomography (PET) radiopharmaceuticals have been developed. Most P-gp radiopharmaceuticals are labeled with carbon-11, while labeling with fluorine-18 would increase their applicability due to longer half-life. Here we present the synthesis and in vivo evaluation of three novel fluorine-18 labeledradiopharmaceuticals: 4-((6,7-dimethoxy-3,4-dihydroisoquinolin-2(1H)-y
P-糖蛋白(P-gp)以及血脑屏障(BBB)上的其他转运蛋白限制了许多药物进入大脑。在几种神经系统疾病中发现了P-gp功能的改变。为了研究P-gp功能,已经开发了许多正电子发射断层扫描(PET)放射性药物。大多数P-gp放射性药物都用碳11标记,而氟18标记则由于更长的半衰期而增加了其适用性。在这里,我们介绍三种新型氟18标记的放射性药物的合成和体内评价:4-((6,7-二甲氧基-3,4-二氢异喹啉-2(1 H)-基)甲基)-2-(4-氟苯基)恶唑(1a),2-联苯基-4-基-2-氟乙氧基-6,7-二甲氧基-1,2,3,4-四氢-异喹啉(2)和5-(1-(2-氟乙氧基))-[3-(6,7-二甲氧基-3,4-二氢-1 H-异喹啉-2-基)-丙基] -5,6,7 ,8-四氢萘(3)。该化合物在体外被表征为P-gp底物,并使用Mdr1a / b (-/-) Bcrp1 (-/-)和野生型小鼠来评估体内底物的潜力。与(R)-[
[EN] 6,7-DIOXYALKYLTETRAHYDROISOQUINOLINE COMPOUNDS<br/>[FR] COMPOSÉS DE 6,7-DIOXYALKYLTÉTRAHYDROISOQUINOLINE
申请人:STICHTING TECH WETENSCHAPP
公开号:WO2015194954A1
公开(公告)日:2015-12-23
The present invention relates to a 6,7-dioxyalkyltetrahydroisoquinoline compound, or a salt or solvate thereof according to formula I: (formula I), (I) wherein R represents hydrogen or a fluorinated alkyl group, and R2 and R3 independently represents hydrogen or an alkyl group.