From Tyrosine to Glycine: Synthesis and Biological Activity of Potent Antagonists of the Purinergic P2X7 Receptor
摘要:
The characterization of the native and recombinant P2X(7) receptor continues to be hindered by the lack of specific and subtype-selective antagonists with a "druglike" profile. However, a tyrosine derivative named KN-62 exhibits selective P2X(7) receptor-blocking properties. As a molecular simplification of KN-62, the present study was designed to evaluate the functional antagonistic properties of a novel series of glycine derivatives characterized by the presence of different phenyl-substituted piperazine moieties. Antagonistic activity of these glycine derivatives was tested on HEK293 cells transfected with the human P2X(7) receptor. The most potent P2X(7) receptor antagonist identified in this study (compound 4g) contains an o-fluorine substituent on the phenylpiperazine moiety and had an IC50 of 12.1 nM. The biological responses investigated were ATP-dependent Ca2+ influx across the plasma membrane and ethidium bromide uptake.
From Tyrosine to Glycine: Synthesis and Biological Activity of Potent Antagonists of the Purinergic P2X7 Receptor
摘要:
The characterization of the native and recombinant P2X(7) receptor continues to be hindered by the lack of specific and subtype-selective antagonists with a "druglike" profile. However, a tyrosine derivative named KN-62 exhibits selective P2X(7) receptor-blocking properties. As a molecular simplification of KN-62, the present study was designed to evaluate the functional antagonistic properties of a novel series of glycine derivatives characterized by the presence of different phenyl-substituted piperazine moieties. Antagonistic activity of these glycine derivatives was tested on HEK293 cells transfected with the human P2X(7) receptor. The most potent P2X(7) receptor antagonist identified in this study (compound 4g) contains an o-fluorine substituent on the phenylpiperazine moiety and had an IC50 of 12.1 nM. The biological responses investigated were ATP-dependent Ca2+ influx across the plasma membrane and ethidium bromide uptake.
From Tyrosine to Glycine: Synthesis and Biological Activity of Potent Antagonists of the Purinergic P2X<sub>7</sub> Receptor
作者:Romeo Romagnoli、Pier Giovanni Baraldi、Maria Dora Carrion、Carlota Lopez Cara、Delia Preti、Olga Cruz-Lopez、Mojgan Aghazadeh Tabrizi、Allan R. Moorman、Stefania Gessi、Eleonora Fogli、Valeria Sacchetto、Pier Andrea Borea
DOI:10.1021/jm070443e
日期:2007.7.1
The characterization of the native and recombinant P2X(7) receptor continues to be hindered by the lack of specific and subtype-selective antagonists with a "druglike" profile. However, a tyrosine derivative named KN-62 exhibits selective P2X(7) receptor-blocking properties. As a molecular simplification of KN-62, the present study was designed to evaluate the functional antagonistic properties of a novel series of glycine derivatives characterized by the presence of different phenyl-substituted piperazine moieties. Antagonistic activity of these glycine derivatives was tested on HEK293 cells transfected with the human P2X(7) receptor. The most potent P2X(7) receptor antagonist identified in this study (compound 4g) contains an o-fluorine substituent on the phenylpiperazine moiety and had an IC50 of 12.1 nM. The biological responses investigated were ATP-dependent Ca2+ influx across the plasma membrane and ethidium bromide uptake.
Design, Synthesis, and Biological Evaluation of a Series of Benzo[<i>de</i>][1,7]naphthyridin-7(8<i>H</i>)-ones Bearing a Functionalized Longer Chain Appendage as Novel PARP1 Inhibitors
A series of benzo[de][1,7]naphthyridin-7(8H)-ones possessing a functionalized long-chain appendage have been designed and evaluated as novel PARP1 inhibitors. The initial effort led to the first-generation PARP1 inhibitor 26 bearing a terminal phthalazin-1(2H)-one framework and showing remarkably high PARP1 inhibitory activity (0.31 nM) but only moderate potency in the cell. Further effort generated the second-generation lead 41, showing high potency against both the PARP1 enzyme and BRCA-deficient cells, especially for the BRCA1-deficient MDA-MB-436 cells (CC50 < 0.26 nM). Mechanistic studies revealed that the new PARP1 inhibitors significantly inhibited H2O2-triggered PARylation in SKOV3 cells, induced cellular accumulation of DNA double-strand breaks, and impaired cell-cycle progression in BRCA2-deficient cells. Significant potentiation on the cytotoxicity of Temozolomide was also observed. The unique structural character and exceptionally high potency of 41 made it stand out as a promising drug candidate worthy for further evaluation.