Characterization of 4-methyl-2-oxo-1,2-dihydroquinolin-6-yl acetate as an effective antiplatelet agent
摘要:
We have studied earlier a membrane bound novel enzyme Acetoxy Drug: protein transacetylase identified as Calreticulin Transacetylase (CRTAase) that catalyzes the transfer of acetyl groups from polyphenolic acetates (PAs) to the receptor proteins and thus modulating their biological activities. In this communication, we have reported for the first time that acetoxy quinolones are endowed with antiplatelet action by virtue of causing CRTAase catalyzed activation of platelet Nitric Oxide Synthase (NOS) by way of acetylation leading to the inhibition of ADP/Arachidonic acid (AA)-dependent platelet aggregation. The correlation of specificity of platelet CRTAase to various analogues of acetoxy quinolones with intracellular NO and consequent effect on inhibition of platelet aggregation was considered crucial. Among acetoxy quinolones screened, 6-AQ (4-methyl-2-oxo-1,2-dihydroquinolin-6-yl acetate/6-acetoxyquinolin-2-one, 22) was found to be the superior substrate to platelet CRTAase and emerged as the most active entity to produce antiplatelet action both in vitro and in vivo. 6-AQ caused the inhibition of cyclooxygenase-1 (Cox-1) resulting in the down regulation of thromboxane A2 (TxA2) and the inhibition of platelet aggregation. Structural modi. cation of acetoxy quinolones positively correlated with enhancement of intracellular NO and antiplatelet action. (C) 2010 Elsevier Ltd. All rights reserved.
Byvanck, Chemische Berichte, 1898, vol. 31, p. 2153
作者:Byvanck
DOI:——
日期:——
Characterization of 4-methyl-2-oxo-1,2-dihydroquinolin-6-yl acetate as an effective antiplatelet agent
作者:Nivedita Priya、Anjali Gupta、Karam Chand、Prabhjot Singh、Abha Kathuria、Hanumantharao G. Raj、Virinder S. Parmar、Sunil K. Sharma
DOI:10.1016/j.bmc.2010.04.011
日期:2010.6.1
We have studied earlier a membrane bound novel enzyme Acetoxy Drug: protein transacetylase identified as Calreticulin Transacetylase (CRTAase) that catalyzes the transfer of acetyl groups from polyphenolic acetates (PAs) to the receptor proteins and thus modulating their biological activities. In this communication, we have reported for the first time that acetoxy quinolones are endowed with antiplatelet action by virtue of causing CRTAase catalyzed activation of platelet Nitric Oxide Synthase (NOS) by way of acetylation leading to the inhibition of ADP/Arachidonic acid (AA)-dependent platelet aggregation. The correlation of specificity of platelet CRTAase to various analogues of acetoxy quinolones with intracellular NO and consequent effect on inhibition of platelet aggregation was considered crucial. Among acetoxy quinolones screened, 6-AQ (4-methyl-2-oxo-1,2-dihydroquinolin-6-yl acetate/6-acetoxyquinolin-2-one, 22) was found to be the superior substrate to platelet CRTAase and emerged as the most active entity to produce antiplatelet action both in vitro and in vivo. 6-AQ caused the inhibition of cyclooxygenase-1 (Cox-1) resulting in the down regulation of thromboxane A2 (TxA2) and the inhibition of platelet aggregation. Structural modi. cation of acetoxy quinolones positively correlated with enhancement of intracellular NO and antiplatelet action. (C) 2010 Elsevier Ltd. All rights reserved.
Ammonium derivatives of chromenones and quinolinones as lead antimicrobial agents
作者:SHILPI GUPTA、SEEMA SINGH、ABHA KATHURIA、MANISH KUMAR、SWETA SHARMA、RAM KUMAR、VIRINDER S PARMAR、BHARAT SINGH、ANJALI GUPTA、ERIK VAN DER EYCKEN、GAINDA L SHARMA、SUNIL K SHARMA
DOI:10.1007/s12039-011-0147-7
日期:2012.3
A series of novel ammonium derivatives were synthesized and examined for their antimicrobial efficacy. Comparison of antimicrobial spectrum revealed that compounds 9, 11, 16 and 23 had strong potential against pathogens in vitro. Cytotoxicity results showed compound 9 to be least toxic, it is non-toxic to A549 and U87 cells in MTT assay and exhibits marginal toxicity (15–20%) to human erythrocytes at a concentration of 1000 μg/ml as compared to 100% lysis of cells by 31.25 μg/ml of the standard drug amphotericin B. This compound has MIC values in the range of 1.95–31.25 μg/disc in DDA against different pathogens and may considered to be an important lead antimicrobial molecule for further exploration.