1431509-15-7Relevant articles and documents
Oxazoloisoindolinones with in vitro antitumor activity selectively activate a p53-pathway through potential inhibition of the p53-MDM2 interaction
Soares, Joana,Pereira, Nuno A.L.,Monteiro, ngelo,Leo, Mariana,Bessa, Cludia,Dos Santos, Daniel J.V.A.,Raimundo, Liliana,Queiroz, Glria,Bisio, Alessandra,Inga, Alberto,Pereira, Clara,Santos, Maria M.M.,Saraiva, Luclia
, p. 138 - 147 (2015)
One of the most appealing targets for anticancer treatment is the p53 tumor suppressor protein. In half of human cancers, this protein is inactivated due to endogenous negative regulators such as MDM2. Actually, restoring the p53 activity, particularly through the inhibition of its interaction with MDM2, is considered a valuable therapeutic strategy against cancers with a wild-type p53 status. In this work, we report the synthesis of nine enantiopure phenylalaninol-derived oxazolopyrrolidone lactams and the evaluation of their biological effects as p53-MDM2 interaction inhibitors. Using a yeast-based screening assay, two oxazoloisoindolinones, compounds 1b and 3a, were identified as potential p53-MDM2 interaction inhibitors. The molecular mechanism of oxazoloisoindolinone 3a was further validated in human colon adenocarcinoma HCT116 cells with wild-type p53 (HCT116 p53+/+) and in its isogenic derivative without p53 (HCT116 p53-/-). Indeed, using these cells, we demonstrated that oxazoloisoindolinone 3a exhibited a p53-dependent in vitro antitumor activity through induction of G0/G1-phase cell cycle arrest and apoptosis. The selective activation of a p53-apoptotic pathway by oxazoloisoindolinone 3a was further supported by the occurrence of PARP cleavage only in p53-expressing HCT116 cells. Moreover, oxazoloisoindolinone 3a led to p53 protein stabilization and to the up-regulation of p53 transcriptional activity with increased expression levels of several p53 target genes, as p21(WAF1/CIP1), MDM2, BAX and PUMA, in p53+/+ but not in p53-/- HCT116 cells. Additionally, the ability of oxazoloisoindolinone 3a to block the p53-MDM2 interaction in HCT116 p53+/+ cells was confirmed by co-immunoprecipitation. Finally, the molecular docking analysis of the interactions between the synthesized compounds and MDM2 revealed that oxazoloisoindolinone 3a binds to MDM2. Altogether, this work adds, for the first time, the oxazoloisoindolinone scaffold to the list of chemotypes activators of a wild-type p53-pathway with promising antitumor activity. Moreover, it may open the way to the development of a new class of p53-MDM2 interaction inhibitors.
Optimization of Bicyclic Lactam Derivatives as NMDA Receptor Antagonists
Espadinha, Margarida,Dourado, Jorge,Lajarin-Cuesta, Rocio,Herrera-Arozamena, Clara,Gon?alves, Lidia M. D.,Rodríguez-Franco, María Isabel,de los Rios, Cristobal,Santos, Maria M. M.
, p. 537 - 545 (2017)
N-Methyl-d-aspartate (NMDA) receptors are fundamental for the normal function of the central nervous system (CNS), and play an important role in memory and learning. Over-activation of these receptors leads to neuronal loss associated with major neurological disorders such as Parkinson's disease, Alzheimer's disease, schizophrenia, and epilepsy. In this study, 22 novel enantiopure bicyclic lactams were designed, synthesized, and evaluated as NMDA receptor antagonists. Most of the new compounds displayed NMDA receptor antagonism, and the most promising compound showed an IC50 value on the same order of magnitude as that of memantine, an NMDA receptor antagonist in clinical use for the treatment of Alzheimer's disease. Further biological evaluation indicated that this compound is brain permeable (determined by an in vitro assay) and non-hepatotoxic. All these results indicate that (3S,7aS)-7a-(4-chlorophenyl)-3-(4-hydroxybenzyl)tetrahydropyrrolo[2,1-b]oxazol-5(6H)-one (compound 5 b) is a potential candidate for the treatment of pathologies associated with the over-activation of NMDA receptors.
Synthesis of phenylalaninol-derived oxazolopyrrolidone lactams and evaluation as NMDA receptor antagonists
Pereira, Nuno A. L.,Sureda, Francesc X.,Turch, Mireia,Amat, Mercedes,Bosch, Joan,Santos, Maria M. M.
, p. 473 - 477 (2013/07/26)
N-Methyl-d-aspartate (NMDA) receptor antagonists are known to rescue neuronal cell death caused by excessive activation of glutamate receptors. This phenomenon, known as excitotoxicity, is implicated in the pathogenesis of several neurodegenerative disorders including ischemia, Alzheimer's disease, Parkinson's disease, and Huntington's disease. Unfortunately, some NMDA receptor antagonists have shown discouraging results when tested in clinical trials. However, recent advances in the physiology and pharmacology of the NMDA receptor have kept interest alive in modulating NMDA receptors for therapeutic intervention. We present here the synthesis of a small library of phenylalaninol-derived oxazolopyrrolidone lactams and their evaluation as NMDA receptor antagonists. The compounds were easily synthesized in yields up to 92 %. In addition, one of the compounds has a 50 % inhibitory concentration (IC 50) of 62 μM and offers potential to develop more potent NMDA receptor antagonists.
