- New Pqs Quorum Sensing System Inhibitor as an Antibacterial Synergist against Multidrug-Resistant Pseudomonas aeruginosa
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Development of new bacterial biofilm inhibitors as antibacterial synergists is an effective strategy to solve the resistance of Pseudomonas aeruginosa. In this paper, a series of 3-hydroxy-pyridin-4(1H)-ones were synthesized and evaluated, and the hit compound (20p) was identified with the effects of inhibiting the production of pyocyanin (IC50 = 8.6 μM) and biofilm formation (IC50 = 4.5 μM). Mechanistic studies confirmed that 20p inhibits the formation of bacterial biofilm by inhibiting the expression of pqsA, blocking pqs quorum sensing system quinolone biosynthesis. Moreover, we systematically investigated the bactericidal effects of combining currently approved antibiotics for CF including tobramycin, ciprofloxacin, and colistin E with 20p, which showed obvious antibacterial synergy to overcome antibiotics resistance in multidrug-resistant P. aeruginosa biofilms. The result indicates that compound 20p may be used in the future as a potentially novel antibacterial synergist candidate for the treatment of P. aeruginosa infections.
- Liu, Jun,Hou, Jin-Song,Chang, Yi-Qun,Peng, Li-Jun,Zhang, Xiao-Yi,Miao, Zhi-Ying,Sun, Ping-Hua,Lin, Jing,Chen, Wei-Min
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p. 688 - 709
(2022/01/12)
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- Pyridone hexa-alkyne amine modified derivative and preparation method and application thereof
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The invention relates to a pyridone hexa-alkyne amine modified derivative as shown in a formula (I) and a pharmaceutically acceptable salt thereof, a preparation method thereof, application of the pyridone hexa-alkyne amine modified derivative or the pharmaceutically acceptable salt thereof to preparation of drugs for preventing or treating related diseases, especially Alzheimer's disease and Parkinson's disease, by inhibiting monoamine oxidase, chelating metal iron ions, resisting Abeta and resisting oxidation. According to the invention, a series of novel single-molecule multi-target anti-ADactive compounds are synthesized, and pyridone derivatives with iron ion chelating activity and propynylamine with MAOB inhibitory activity are creatively and organically combined together, so that the compounds have remarkable advantages on Alzheimer's disease with complex pathogenesis; and the combined molecules are far superior to CP20 (deferiprone) in the aspect of iron ion chelating activity.
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- N-Propargylamine-hydroxypyridinone hybrids as multitarget agents for the treatment of Alzheimer's disease
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AD is a progressive brain disorder. Because of the lack of remarkable single-target drugs against neurodegenerative disorders, the multitarget-directed ligand strategy has received attention as a promising therapeutic approach. Herein, we rationally designed twenty-nine hybrids of N-propargylamine-hydroxypyridinone. The designed hybrids possessed excellent iron-chelating activity (pFe3+ = 17.09–22.02) and potent monoamine oxidase B inhibitory effects. Various biological evaluations of the optimal compound 6b were performed step by step, including inhibition screening of monoamine oxidase (hMAO-B IC50 = 0.083 ± 0.001 μM, hMAO-A IC50 = 6.11 ± 0.08 μM; SI = 73.5), prediction of blood–brain barrier permeability and mouse behavioral research. All of these favorable results proved that the N-propargylamine-hydroxypyridinone scaffold is a promising structure for the discovery of multitargeted ligands for AD therapy.
- Guo, Jianan,Zhang, Yujia,Zhang, Changjun,Yao, Chuansheng,Zhang, Jingqi,Jiang, Xiaoying,Zhong, Zhichao,Ge, Jiamin,Zhou, Tao,Bai, Renren,Xie, Yuanyuan
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- Synthesis, anti-HIV-1 and antiproliferative evaluation of novel 4-nitroimidazole derivatives combined with 5-hydroxy-4-pyridinone moiety
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In an effort to synthesize more effective non-nucleoside reverse transcriptase inhibitors (NNRTIs) against the HIV-1 infection, a new series of novel 4-nitroimidazole derivatives combined with 5-hydroxy-4-pyridinone moiety were designed by molecular docking studies, prepared and characterized by spectroscopic techniques. All the synthesized compounds were in vitro evaluated for their inhibitory effect against the HIV-1 replication in the MT-4 cells. Results showed that none of these synthesized compounds displayed any specific anti HIV-1 activity. Surprisingly, these compounds showed high cytotoxicity against MT-4 cells with low selectivity index (50 = 1.3 μM and EC50 = 1.8 μM respectively).
- Shirvani, Pouria,Fassihi, Afshin,Saghaie, Lotfollah,Van Belle, Siska,Debyser, Zeger,Christ, Frauke
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- Functionality study of chalcone-hydroxypyridinone hybrids as tyrosinase inhibitors and influence on anti-tyrosinase activity
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In an attempt to synthesise new tyrosinase inhibitors, we designed and synthesised a series of chalcone-hydroxypyridinone hybrids as potential tyrosinase inhibitors adopting strategic modifications of kojic acid. All the newly synthesised compounds were characterised by NMR and mass spectrometry. Initial screening of the target compounds demonstrated that compounds 1a, 1d, and 1n had relatively strong inhibitory activities against tyrosinase monophenolase, with IC50 values of 3.07 ± 0.85, 2.25 ± 0.8 and 2.75 ± 1.19 μM, respectively. The inhibitory activity against monophenolase was 6- to 8-fold higher than that of kojic acid. Compounds 1a, 1d, and 1n also showed inhibition of diphenolase, with IC50 values of 17.05 ± 0.07, 11.70 ± 0.03 and 19.3 ± 0.28 μM, respectively. The inhibition kinetics of diphenolase indicates that compounds 1a and 1d induce reversible inhibition on tyrosinase. Finally, we found that copper coordination should be one of the important inhibitory mechanism of these compounds in tyrosinase.
- Singh, L. Ravithej,Chen, Yu-Lin,Xie, Yuan-Yuan,Xia, Wei,Gong, Xing-Wen,Hider, Robert C.,Zhou, Tao
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p. 1562 - 1567
(2020/08/07)
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- ALA-HPO hybrid derivative with iron chelating property and PDT activity, preparation method and application thereof
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The invention provides an ALA-HPO hybrid derivative shown as a formula (I) or a formula (II), and a preparation method thereof, and application of the ALA-HPO hybrid derivative in preparation of photodynamic therapy drugs. The formula (I) and the formula (II) are defined in the specification.
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- Novel hydroxypyridinone compounds as well as preparation method and application thereof
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The invention belongs to the field of medicines and discloses novel hydroxypyridinone compounds as well as a preparation method and an application thereof. The compounds have the chemical structure shown in a formula (I), (II) or (III), wherein R1 is prop
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- Design, synthesis and anti-HIV-1 evaluation of a series of 5-hydroxypyridine-4-one derivatives as possible integrase inhibitors
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A series of 5-hydroxypyridine-4-one derivatives were synthesized and subjected to HIV-1 replication inhibition assay. Docking studies provide a detailed molecular binding model for this class of compounds interacting with integrase enzyme. All of the deri
- Rostami, Mahboubeh,Sirous, Hajar,Zabihollahi, Rezvan,Aghasadeghi, Mohammad R.,Sadat, Seyed Mehdi,Namazi, Rahele,Saghaie, Lotfollah,Memarian, Hamid R.,Fassihi, Afshin
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p. 4113 - 4127
(2015/11/02)
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- Kojic acid derived hydroxypyridinone-chloroquine hybrids: Synthesis, crystal structure, antiplasmodial activity and β-haematin inhibition
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Aminochloroquinoline-kojic acid hybrids were synthesized and evaluated for β-haematin inhibition and antiplasmodial activity against drug resistant (K1) and sensitive (3D7) strains of Plasmodium falciparum. Compound 7j was the most potent compound in both strains (IC503D7 = 0.004 μM; IC50K1 = 0.03 μM) and had the best β-haematin inhibition activity (0.07 IC50 equiv vs 1.91 IC 50 equiv for chloroquine). One compound 8c was found to be equipotent in both strains (IC50 = 0.04 μM).
- Andayi, Warren Andrew,Egan, Timothy J.,Chibale, Kelly
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p. 3263 - 3267
(2014/07/22)
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- Design and synthesis of hydroxypyridinone-l-phenylalanine conjugates as potential tyrosinase inhibitors
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A range of hydroxypyridinone-l-phenylalanine conjugates were synthesized starting from kojic acid. Their tyrosinase activity was determined, and it was found that one of the compounds ((S)-(5-(benzyloxy)-1-octyl-4-oxo-1,4- dihydropyridin-2-yl)methyl 2-amino-3-phenylpropanoate, 5e) showed potent inhibitory effect against mushroom tyrosinase, the IC50 values for monophenolase and diphenolase activities being 12.6 and 4.0 μM, respectively. It was also demonstrated that these conjugates are mixed-type inhibitors, suggesting they could bind to both the free enzyme and the enzyme-substrate complexes. MTT assay indicated that 5e was nontoxic to three cell lines. This compound may find applications in food preservation and cosmetics.
- Li, Dong-Fang,Hu, Pan-Pan,Liu, Mu-Song,Kong, Xiao-Le,Zhang, Jin-Chao,Hider, Robert C.,Zhou, Tao
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p. 6597 - 6603
(2013/07/26)
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- Design, synthesis, physicochemical properties, and evaluation of novel iron chelators with fluorescent sensors
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The synthesis of a range of novel 3-hydroxypyridin-4-ones and 3-hydroxypyran-4-ones linked with different coumarin substituents is described. These compounds have been developed in order to provide a series of molecular probes for the quantification of intracellular labile iron pools. An evaluation of the effect of iron(III) on fluorescence intensity was undertaken. Chelation of iron(III) causes quenching of fluorescence. The relationship between iron(III) concentration and the extent of fluorescence quenching indicates that the metal is chelated in a complex with a metal-to-ligand stoichiometry of 1:3. The fluorescence of hydroxypyridinone compounds was found to be more efficiently quenched by iron(III) than were the hydroxypyranones. The metal-to-ligand stoichiometry at which maximum quenching is observed was found to depend on the site at which coumarin is attached. The efficiency of fluorescence quenching by iron(III) is markedly influenced by solvent polarity and pH. The permeability of two representative fluorescent chelators across human erythrocyte ghost membranes was investigated. The rate of permeability for a series of probes was found to be related to the corresponding ClogP values.
- Ma, Yongmin,Luo, Wei,Quinn, Peter J.,Liu, Zudong,Hider, Robert C.
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p. 6349 - 6362
(2007/10/03)
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- Synthesis and cytotoxicity evaluation of metal-chelator-bearing flavone, carbazole, dibenzofuran, xanthone, and anthraquinone
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2-(Aryloxymethyl)-5-benzyloxy-1-methyl-1H-pyridin-4-ones 8a-8g, 2-(aryloxymethyl)-5-hydroxy-4H-pyran-4-ones 9a-9g, and 2-(aryloxymethyl)-5-hydroxy-1-methyl-1H-pyridin-4-ones 10a-10g were prepared from the known 5-benzyloxy-2-(hydroxymethyl)pyran-4-one (3) in a good overall yield. These compounds were evaluated in vitro against a three-cell lines panel consisting of MCF7 (breast), NCI-H460 (lung), and SF-268 (CNS), and the active compounds passed on for evaluation in the full panel of 60 human tumor cell lines derived from nine cancer cell types. The results indicated that 5-hydroxy derivatives are more favorable than their corresponding 5-benzyloxy precursors (10a-10g vs. 8a-8g), and 1-methyl-1H-pyridin-4-ones are more favorable than their corresponding pyran-4(1H)-ones (10a-10g vs. 9a-9g). Among these three types of compounds, 2-(aryloxymethyl)-5-hydroxy-1-methyl-1H-pyridin-4-ones 10a-10g were the most cytotoxic; they inhibited the growth of almost all the cancer cells tested. On the contrary, compound 8a (a mean GI50 = 27.8 μM), 8b (38.5), 8d (11.0), and 8e (30.5) are especially active against the growth of SK-MEL-5 (a melanoma cancer cell) with a GI50 of 0.01, 5.65, 0.55, and 0.03 μM, respectively (cf. Table 2).
- Chen, Yeh-Long,Chen, Po-Hsu,Chung, Chao-Ho,Li, Kuang-Chieh,Jeng, Haw-Yaun,Tzeng, Cherng-Chyi
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p. 778 - 786
(2007/10/03)
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- Chemistry of Kojic Acid: One-Step Syntheses of Benzothiazoles and Other Fused Heterocycles from Kojic Acid Derivatives
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The reactions of the benzyl ether (1b) of kojic acid (1a) and its chloromethyl derivative (1c) were investigated as new routes to fused heterocyclic systems.The chloromethyl compound proved the more versatile intermediate yielding benzothiazoles with thio
- Teitei, Tsutomu
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p. 2307 - 2316
(2007/10/02)
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