Nejvíce citovaný článek - PubMed ID 8112696
Alterations in Pseudomonas aeruginosa exoproducts by sub-MICs of some antibiotics
Fifty seven Klebsiella strains, viz. K. pneumoniae (28), K. planticola (19), K. oxytoca (6), K. ornithinolytica (3) and K. terrigena (1) possessed lipolytic and urealytic activity. The effect of imipenem and ofloxacin at subinhibitory concentrations (sub-MICs) on these enzymic activities of 4 strains was studied. At all the concentrations tested (mainly at 1/4 of the MICs) imipenem enhanced lipase activity manifested by cleavage of the substrate Tween 20. The effect of ofloxacin was strain- and concentration-dependent but in most cases lipolytic activity was also increased. The antibiotics practically did not affect the urease activity of the strains.
- MeSH
- antiinfekční látky farmakologie MeSH
- imipenem farmakologie MeSH
- infekce bakteriemi rodu Klebsiella mikrobiologie MeSH
- Klebsiella klasifikace účinky léků enzymologie MeSH
- lidé MeSH
- lipasa metabolismus MeSH
- mikrobiální testy citlivosti MeSH
- ofloxacin farmakologie MeSH
- thienamyciny farmakologie MeSH
- ureasa metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- antiinfekční látky MeSH
- imipenem MeSH
- lipasa MeSH
- ofloxacin MeSH
- thienamyciny MeSH
- ureasa MeSH
The postantibiotic effect (PAE) and the postantibiotic sub-MIC effect (PASME) of ciprofloxacin, pefloxacin and amikacin were studied for Salmonella typhimurium and S. enteritidis strains. PAE was induced by 2 x and 4 x MIC of antibiotics studied for 0.5 h. After PAE and PASME their effect on prophage induction of a lysogenic S. typhimurium strain and on Congo red binding for both strains as a marker of their surface hydrophobicity was examined. The longest PAE was found after treatment with ciprofloxacin, higher values being observed with S. typhimurium. PAEs of pefloxacin and amikacin were much lower, except for the suprainhibitory concentration 4 x MIC of amikacin with S. enteritidis (6.9h). PASMEs of ciprofloxacin did not allow any regrowth of either strain. For other antibiotics the PASMEs were different while concentrations of 2 x MIC + 0.2 x MIC and 0.3 x MIC, and of 4 x MIC + 0.1 x MIC, 0.2 x MIC and 0.3 x MIC of amikacin did not allow any regrowth of S. enteritidis. PAEs of the antibiotics tested did not affect the Congo red binding by both Salmonella strains, but the PAEs of ciprofloxacin and pefloxacin expressively induced a prophage of lysogenic S. typhimurium strain. We noted the influence of Congo red binding after applying 4 x MIC + 0.1 x MIC, 0.2 x MIC and 0.3 x MIC of amikacin for S. typhimurium and 2 x MIC + 0.1 x MIC for S. enteritidis.
- MeSH
- aktivace viru účinky léků MeSH
- amikacin aplikace a dávkování farmakologie MeSH
- antibakteriální látky aplikace a dávkování farmakologie MeSH
- antiinfekční látky aplikace a dávkování farmakologie MeSH
- bakteriofágy MeSH
- barvicí látky MeSH
- buněčná stěna chemie účinky léků MeSH
- chemické jevy MeSH
- ciprofloxacin aplikace a dávkování farmakologie MeSH
- fágy salmonel účinky léků růst a vývoj MeSH
- fyzikální chemie MeSH
- Kongo červeň MeSH
- mikrobiální testy citlivosti MeSH
- pefloxacin aplikace a dávkování farmakologie MeSH
- Salmonella enteritidis účinky léků metabolismus MeSH
- Salmonella typhimurium účinky léků metabolismus virologie MeSH
- vztah mezi dávkou a účinkem léčiva MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
- Názvy látek
- amikacin MeSH
- antibakteriální látky MeSH
- antiinfekční látky MeSH
- barvicí látky MeSH
- ciprofloxacin MeSH
- Kongo červeň MeSH
- pefloxacin MeSH
Hydrophobicity and profiles of outer membrane proteins of Shigella dysenteriae type 1 after treatment with subinhibitory concentrations (1/2 or 1/4 of the MIC) of aminoglycosides were studied. The antimicrobial activity of the antibiotics tested was 3.12 mg/L (amikacin, tobramycin) and 6.25 mg/L (gentamicin). The hydrophobicity of the cell surface of S. dysenteriae type 1 was decreased after exposure to all aminoglycosides at a concentration of 1/2 of the MICs; 1/4 of the MICs of the antibiotics did not affect bacterial aggregation in the presence of ammonium sulfate. SDS-polyacrylamide gel electrophoresis showed that the profiles of outer membrane proteins of the strain treated with aminoglycosides at both subinhibitory concentrations were not changed as compared to the control.
- MeSH
- amikacin aplikace a dávkování farmakologie MeSH
- antibakteriální látky farmakologie MeSH
- buněčná stěna chemie účinky léků MeSH
- chemické jevy MeSH
- elektroforéza v polyakrylamidovém gelu MeSH
- fyzikální chemie MeSH
- gentamiciny aplikace a dávkování farmakologie MeSH
- proteiny vnější bakteriální membrány chemie MeSH
- Shigella dysenteriae účinky léků metabolismus MeSH
- tobramycin aplikace a dávkování farmakologie MeSH
- Publikační typ
- časopisecké články MeSH
- srovnávací studie MeSH
- Názvy látek
- amikacin MeSH
- antibakteriální látky MeSH
- gentamiciny MeSH
- proteiny vnější bakteriální membrány MeSH
- tobramycin MeSH
Antipseudomonadal activity of homologous series of six quaternary bisammonium salts (QBAS) (4,7-dioxo-3,8-dioxadekan-1,1-[bis(alkyldimethyldiammonium dibromide)] as well as the effect of their subinhibitory concentrations (sub-MICs) on Pseudomonas aeruginosa virulence factors was studied. Antibacterial activity of QBAS increased up to a certain length of the chain and then decreased with further elongation. All the tested sub-MICs of QBAS caused a significant suppression of phospholipase C activity (to 0-41%). Elastase and proteinase activity were less efficiently reduced. A more effective decrease of these activities was only found after treatment with one-fourth of the MICs of the tested substances. QBAS caused only an erratic decrease of alginate production.
- MeSH
- algináty metabolismus MeSH
- antibakteriální látky chemie farmakologie MeSH
- fosfolipasy typu C antagonisté a inhibitory MeSH
- inhibitory enzymů chemie farmakologie MeSH
- inhibitory proteas chemie farmakologie MeSH
- kvartérní amoniové sloučeniny chemie farmakologie MeSH
- kyselina glukuronová MeSH
- kyseliny hexuronové MeSH
- lidé MeSH
- mikrobiální testy citlivosti MeSH
- molekulární struktura MeSH
- pankreatická elastasa antagonisté a inhibitory MeSH
- Pseudomonas aeruginosa účinky léků metabolismus patogenita MeSH
- virulence účinky léků MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- algináty MeSH
- antibakteriální látky MeSH
- fosfolipasy typu C MeSH
- inhibitory enzymů MeSH
- inhibitory proteas MeSH
- kvartérní amoniové sloučeniny MeSH
- kyselina glukuronová MeSH
- kyseliny hexuronové MeSH
- pankreatická elastasa MeSH
The effects of subinhibitory concentrations (1/4, 1/8, 1/16 of the MIC) of 12 organic ammonium salts of A (hard-alkyltrimethylammonium bromides) and B (soft--2-(dodecanoylamino)ethylalkyldimethylammonium bromides) homologous series on phospholipase C, proteinase, elastase and permeability activity were studied. The substances with longer substituents were more effective in reducing phospholipase C activity (hard and soft series) as well as proteinase (hard series). Phospholipase C was the most frequently and the most markedly inhibited enzyme. The organic ammonium salts were less effective in inhibiting elastase and permeability activity. Only one of the substances under study reduced all the tested activities.
- MeSH
- antibakteriální látky farmakologie MeSH
- fosfolipasy typu C antagonisté a inhibitory MeSH
- inhibitory proteas farmakologie MeSH
- kapilární permeabilita MeSH
- kvartérní amoniové sloučeniny farmakologie MeSH
- mikrobiální testy citlivosti MeSH
- pankreatická elastasa antagonisté a inhibitory MeSH
- Pseudomonas aeruginosa účinky léků enzymologie patogenita MeSH
- virulence MeSH
- vztahy mezi strukturou a aktivitou MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- antibakteriální látky MeSH
- fosfolipasy typu C MeSH
- inhibitory proteas MeSH
- kvartérní amoniové sloučeniny MeSH
- pankreatická elastasa MeSH