Human cytochrome P4501B1(h CYP1B1),an extrahepatic heme-dependent monooxygenase,has been validated as a key target for overcoming chemotherapy resistance and tumorigenesis.Herein,to discover novel efficacious h CYP1B1...Human cytochrome P4501B1(h CYP1B1),an extrahepatic heme-dependent monooxygenase,has been validated as a key target for overcoming chemotherapy resistance and tumorigenesis.Herein,to discover novel efficacious h CYP1B1 inhibitors,a suite of 1,8-naphthalimide derivatives was designed,synthesized,and biologically evaluated,via integrating structure-based drug design(SBDD)and biochemical assays.After two rounds of structural modifications and structure-activity relationship(SAR)studies,the results suggested that introducing a benzene ring at the north part and a halogen atom at the C-4 site significantly enhanced the anti-h CYP1B1 effects of naphthalimides.Among all tested 1,8-naphthalimides,NB-10showed the most potent anti-h CYP1B1 effect(half maximal inhibitory concentration(IC_(50))=0.41 nmol/L)and excellent specificity,while this agent did not activate Ah R transcription activity in living cells.Further cellular assays and in vivo tests in paclitaxel(PTX)-resistance xenograft mice showed that NB-10could significantly potentiate the anti-cancer effects of PTX both in vitro and in vivo,while this agent also showed high safety profiles in mice.Mechanistically,NB-10 potently inhibited h CYP1B1-catalyzed 7-ethoxyresorufin O-deethylation in a competitive manner,with an estimated Kivalue of 0.15 nmol/L.Docking simulations showed that NB-10 could be well-fitted in the catalytic pocket of h CYP1B1 to form a stable conformation with a high binding affinity.Collectively,several potent 4-halogenated naphthalimides were developed as novel h CYP1B1 inhibitors,while NB-10 showed high safety profiles and impressive efficacy for overcoming h CYP1B1-associated PTX resistance both in vitro and in vivo.展开更多
Mammalian catechol-O-methyltransferases(COMT)are an important class of conjugative enzymes,which play a key role in the metabolism and inactivation of catechol neurotransmitters,catechol estrogens and a wide range of ...Mammalian catechol-O-methyltransferases(COMT)are an important class of conjugative enzymes,which play a key role in the metabolism and inactivation of catechol neurotransmitters,catechol estrogens and a wide range of endobiotics and xenobiotics that bear the catechol group.Currently,COMT inhibitors are used in combination with levodopa for the treatment of Parkinson’s disease in clinical practice.The crucial role of COMT in human health has raised great interest in the development of more practical assays for highly selective and sensitive detection of COMT activity in real samples,as well as for rapid screening and characterization of COMT inhibitors as drug candidates.This review summarizes recent advances in analytical methodologies for sensing COMT activity and their applications.Several lists of biochemical assays for measuring COMT activity,including the probe substrates,along with their analytical conditions and kinetic parameters,are presented.Finally,the challenges and future perspectives in the field,such as visualization of COMT activity in vivo and in situ,are highlighted.Collectively,this review article overviews the practical assays for measuring COMT activities in complex biological samples,which will strongly facilitate the investigations on the relevance of COMT to human diseases and promote the discovery of COMT inhibitors via high-throughput screening.展开更多
The observation of short gamma ray bursts(SGRBs)in the TeV energy range plays an important role in understanding the radiation mechanism and probing potential new physics,such as Lorentz invariance violation(LIV).Howe...The observation of short gamma ray bursts(SGRBs)in the TeV energy range plays an important role in understanding the radiation mechanism and probing potential new physics,such as Lorentz invariance violation(LIV).However,no SGRBs have been observed in this energy range owing to the short duration of SGRBs and the weakness of current experiments.New experiments with new technology are required to detect the very high energy(VHE)emission of SGRBs.In this study,we simulate the VHE γ-ray emissions from SGRBs and calculate the annu-al detection rate with the High Altitude Detection of Astronomical Radiation(HADAR)experiment.First,a set of pseudo-SGRB samples is generated and checked using the observations of the Fermi-GBM,Fermi-LAT,and Swift-BAT measurements.The annual detection rate is calculated from these SGRB samples based on the performance of the HADAR instrument.As a result,the HADAR experiment can detect 0.5 SGRBs per year if the spectral break-off of γ-rays caused by the internal absorption and Klein-Nishina(KN)effect is larger than 100 GeV.For a GRB090510-like GRB in HADAR's view,it should be possible to detect approximately 2000 photons considering the internal absorption and KN effect.With a time delay assumption due to LIV effects,a simulated light curve of GRB090510 has evident energy dependence.We hope that the HADAR experiment can perform SGRB observa-tions and test our calculations in the future.展开更多
基金supported by the National Natural Science Foundation of China(Nos.82273897,U23A20516,32101202)Organizational Key Research and Development Program of Shanghai University of Traditional Chinese Medicine(No.2023YZZ02)+5 种基金Shanghai Municipal Health Commission’s TCM research project(No.2022CX005)Innovation Team and Talents Cultivation Program of National Administration of Traditional Chinese Medicine(No.ZYYCXTDD-202004)Pudong Institute of Clinical Chinese Medicine(No.YC-2023-0603)The“Fourteenth Five-Year Plan”Traditional Chinese Medicine Specialty Project for the Construction of Andrology Departments in TCM(No.ZYTSZK1-4)the State Key Laboratory of Fine Chemicals,Dalian University of Technology(No.KF2202)the Fundamental Research Funds for the Central Universities(No.G2024KY05106)。
文摘Human cytochrome P4501B1(h CYP1B1),an extrahepatic heme-dependent monooxygenase,has been validated as a key target for overcoming chemotherapy resistance and tumorigenesis.Herein,to discover novel efficacious h CYP1B1 inhibitors,a suite of 1,8-naphthalimide derivatives was designed,synthesized,and biologically evaluated,via integrating structure-based drug design(SBDD)and biochemical assays.After two rounds of structural modifications and structure-activity relationship(SAR)studies,the results suggested that introducing a benzene ring at the north part and a halogen atom at the C-4 site significantly enhanced the anti-h CYP1B1 effects of naphthalimides.Among all tested 1,8-naphthalimides,NB-10showed the most potent anti-h CYP1B1 effect(half maximal inhibitory concentration(IC_(50))=0.41 nmol/L)and excellent specificity,while this agent did not activate Ah R transcription activity in living cells.Further cellular assays and in vivo tests in paclitaxel(PTX)-resistance xenograft mice showed that NB-10could significantly potentiate the anti-cancer effects of PTX both in vitro and in vivo,while this agent also showed high safety profiles in mice.Mechanistically,NB-10 potently inhibited h CYP1B1-catalyzed 7-ethoxyresorufin O-deethylation in a competitive manner,with an estimated Kivalue of 0.15 nmol/L.Docking simulations showed that NB-10 could be well-fitted in the catalytic pocket of h CYP1B1 to form a stable conformation with a high binding affinity.Collectively,several potent 4-halogenated naphthalimides were developed as novel h CYP1B1 inhibitors,while NB-10 showed high safety profiles and impressive efficacy for overcoming h CYP1B1-associated PTX resistance both in vitro and in vivo.
基金supported by the National Key Research and Development Program of China(2017YFC1700200,2017YFC1702000),the National Natural Science Foundation of China(81922070,81703604,81973286,81773687 and 81603187)Natural Science Foundation of Shanghai(18ZR1436500)+3 种基金Program of Shanghai Academic/Technology Research Leader(18XD1403600)Shuguang Program(18SG40)supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commissionthe project sponsored by the development fund for Shanghai talents(2019)the Key Science and Technology Program of Shenyang supported by Shenyang Science and Technology Bureau(17-230-9-05).
文摘Mammalian catechol-O-methyltransferases(COMT)are an important class of conjugative enzymes,which play a key role in the metabolism and inactivation of catechol neurotransmitters,catechol estrogens and a wide range of endobiotics and xenobiotics that bear the catechol group.Currently,COMT inhibitors are used in combination with levodopa for the treatment of Parkinson’s disease in clinical practice.The crucial role of COMT in human health has raised great interest in the development of more practical assays for highly selective and sensitive detection of COMT activity in real samples,as well as for rapid screening and characterization of COMT inhibitors as drug candidates.This review summarizes recent advances in analytical methodologies for sensing COMT activity and their applications.Several lists of biochemical assays for measuring COMT activity,including the probe substrates,along with their analytical conditions and kinetic parameters,are presented.Finally,the challenges and future perspectives in the field,such as visualization of COMT activity in vivo and in situ,are highlighted.Collectively,this review article overviews the practical assays for measuring COMT activities in complex biological samples,which will strongly facilitate the investigations on the relevance of COMT to human diseases and promote the discovery of COMT inhibitors via high-throughput screening.
基金Supported by the National Natural Science Foundation of China(12263004,12263005,12275279)。
文摘The observation of short gamma ray bursts(SGRBs)in the TeV energy range plays an important role in understanding the radiation mechanism and probing potential new physics,such as Lorentz invariance violation(LIV).However,no SGRBs have been observed in this energy range owing to the short duration of SGRBs and the weakness of current experiments.New experiments with new technology are required to detect the very high energy(VHE)emission of SGRBs.In this study,we simulate the VHE γ-ray emissions from SGRBs and calculate the annu-al detection rate with the High Altitude Detection of Astronomical Radiation(HADAR)experiment.First,a set of pseudo-SGRB samples is generated and checked using the observations of the Fermi-GBM,Fermi-LAT,and Swift-BAT measurements.The annual detection rate is calculated from these SGRB samples based on the performance of the HADAR instrument.As a result,the HADAR experiment can detect 0.5 SGRBs per year if the spectral break-off of γ-rays caused by the internal absorption and Klein-Nishina(KN)effect is larger than 100 GeV.For a GRB090510-like GRB in HADAR's view,it should be possible to detect approximately 2000 photons considering the internal absorption and KN effect.With a time delay assumption due to LIV effects,a simulated light curve of GRB090510 has evident energy dependence.We hope that the HADAR experiment can perform SGRB observa-tions and test our calculations in the future.
