Gatifloxacin derivatives: Synthesis, antimycobacterial activities, and inhibition of Mycobacterium tuberculosis DNA gyrase
摘要:
Sixteen 7-substituted gatifloxacin derivatives were synthesized and evaluated for antimycobacterial activity in vitro and in vivo against Mycobacterium tuberculosis H37Rv (MTB) and multi-drug resistant M. tuberculosis (MDR-TB), and also tested for the ability to inhibit the supercoiling activity of DNA gyrase from M. tuberculosis. Among the synthesized compounds, 1-cyclopropyl-6-fluoro-8-methoxy-7-[[[N-4-[I'-(5-isatinyl-beta-semicarbazo)]methyl]3-methyl]N-1-piperazinyl]-4-oxo-1,4-dihydro-3-quinoline carboxylic acid (3d) was found to be the most active compound in vitro with an MIC of 0.0125 mu g/mL against MTB and MTR-TB. In the in vivo animal model 3d decreased the bacterial load in lung and spleen tissues with 3.62- and 3.76-log 10 protections, respectively. Compound 3d was also found to be equally active as gatifloxacin in the inhibition of the supercoiling activity of wild-type M. tuberculosis DNA gyrase with an IC50 of 3.0 mu g/mL. The results demonstrate the potential and importance of developing new quinolone derivatives against mycobacterial infections. (c) 2006 Elsevier Ltd. All rights reserved.
Synthesis, antibacterial, antifungal and anti-HIV activities of norfloxacin Mannich bases
作者:Surendra N Pandeya、Dhamrajan Sriram、Gopal Nath、Erik De Clercq
DOI:10.1016/s0223-5234(00)00125-2
日期:2000.2
Mannich bases of norfloxacin were synthesized by reacting them with formaldehyde and several isatin derivatives. Their chemical structures have been confirmed by means of their IR, H-1-NMR data and by elemental analysis. Investigation of in vitro antimicrobial activity of compounds was done by the agar dilution method against 28 pathogenic bacteria, eight pathogenic fungi and anti-HIV activity against replication of HIV-1 (III B) in MT-4 cells. The in vivo antibacterial efficacy of selected derivatives was determined using a mouse infection model. All the synthesized compounds are more active than norfloxacin against the 13 bacteria tested. The compounds are also more active than the standard drug clotrimazole against Histoplasma capsulatum. Two compounds S-8 and S-9 have shown inhibition against HIV-1 (III B) with EC50 values of 11.3 and 13.9 mu g/mL, respectively. In the mouse protection test, two compounds S-4 (ED50: 1.25 mg/kg) and S-9 (ED50: 1.62 mg/kg) are more active than norfloxacin (ED50: 6mg/kg). Among the compounds tested, 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7[[N-4-[5'-bromo-3'-(4'-amino-5'-trimethoxybenzylpyrimidin-2'-yl]-imino-1'-isatinyl]methyl]N-1-piperazinyl]-3-quinoline carboxylicacid (S-9) showed promising activity in all the three tests. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
Cytotoxicity of Novel Sulfanilamides Towards Sensitive and Multidrugresistant Leukemia Cells
Novel sulfa Schiff bases were synthesized and characterized by a reaction between aromatic sulfonamides and
aromatic aldehydes or heterocyclic ketones in equimolar ratios. Their cytotoxicity was evaluated by the resazurin assay
towards human sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 leukemia cells. Three of the tested
compounds viz., 4-(anthracen-9-ylmethyleneamino)-N-(pyrimidin-2-yl)benzenesulfonamide (4), 4-(anthracen-9-
ylmethyleneamino)benzenesulfonamide, (5) and 4-((3-phenylallylidene)amino)benzene-sulfonamide, (6) were cytotoxic
(IC50 values: 5.38-19.96 µM). CEM/ADR5000 cells were not cross-resistant to these compounds, indicating activity
against otherwise drug-resistant tumors. Compound 6 inhibited P-glycoprotein by increasing doxorubicin accumulation
and reducing expression of P-glycoprotein in CEM/ADR5000 cells. A human P-glycoprotein homology model was used
for molecular docking studies. Compound 6 and verapamil (a well-known P-glycoprotein inhibitor) docked with similar
binding energies to the same binding pocket.
Sixteen 7-substituted gatifloxacin derivatives were synthesized and evaluated for antimycobacterial activity in vitro and in vivo against Mycobacterium tuberculosis H37Rv (MTB) and multi-drug resistant M. tuberculosis (MDR-TB), and also tested for the ability to inhibit the supercoiling activity of DNA gyrase from M. tuberculosis. Among the synthesized compounds, 1-cyclopropyl-6-fluoro-8-methoxy-7-[[[N-4-[I'-(5-isatinyl-beta-semicarbazo)]methyl]3-methyl]N-1-piperazinyl]-4-oxo-1,4-dihydro-3-quinoline carboxylic acid (3d) was found to be the most active compound in vitro with an MIC of 0.0125 mu g/mL against MTB and MTR-TB. In the in vivo animal model 3d decreased the bacterial load in lung and spleen tissues with 3.62- and 3.76-log 10 protections, respectively. Compound 3d was also found to be equally active as gatifloxacin in the inhibition of the supercoiling activity of wild-type M. tuberculosis DNA gyrase with an IC50 of 3.0 mu g/mL. The results demonstrate the potential and importance of developing new quinolone derivatives against mycobacterial infections. (c) 2006 Elsevier Ltd. All rights reserved.