Amdinocillin Pivoxil
Enterobacteriaceae
A family of gram-negative, facultatively anaerobic, rod-shaped bacteria that do not form endospores. Its organisms are distributed worldwide with some being saprophytes and others being plant and animal parasites. Many species are of considerable economic importance due to their pathogenic effects on agriculture and livestock.
tRNA synthetase mutants of Escherichia coli K-12 are resistant to the gyrase inhibitor novobiocin. (1/94)
In previous studies we demonstrated that mutations in the genes cysB, cysE, and cls (nov) affect resistance of Escherichia coli to novobiocin (J. Rakonjac, M. Milic, and D. J. Savic, Mol. Gen. Genet. 228:307-311, 1991; R. Ivanisevic, M. Milic, D. Ajdic, J. Rakonjac, and D. J. Savic, J. Bacteriol. 177:1766-1771, 1995). In this work we expand this list with mutations in rpoN (the gene for RNA polymerase subunit sigma54) and the tRNA synthetase genes alaS, argS, ileS, and leuS. Similarly to resistance to the penicillin antibiotic mecillinam, resistance to novobiocin of tRNA synthetase mutants appears to depend upon the RelA-mediated stringent response. However, at this point the overlapping pathways of mecillinam and novobiocin resistance diverge. Under conditions of stringent response induction, either by the presence of tRNA synthetase mutations or by constitutive production of RelA protein, inactivation of the cls gene diminishes resistance to novobiocin but not to mecillinam. (+info)A Canadian national surveillance study of urinary tract isolates from outpatients: comparison of the activities of trimethoprim-sulfamethoxazole, ampicillin, mecillinam, nitrofurantoin, and ciprofloxacin. The Canadian Urinary Isolate Study Group. (2/94)
Ampicillin, trimethoprim-sulfamethoxazole, mecillinam, nitrofurantoin, and ciprofloxacin mean resistance rates for 2,000 urinary tract isolates collected from outpatients across Canada in 1998 were 41.1, 19.2, 14.7, 5.0, and 1.8%, respectively. For Escherichia coli isolates alone (n = 1,681) comparable rates were 41. 0, 18.9, 7.4, 0.1, and 1.2%, respectively. The majority of E. coli isolates resistant to ampicillin, trimethoprim-sulfamethoxazole, or ciprofloxacin were susceptible (MIC, <16 microg/ml) to mecillinam. (+info)Selected amplification of the cell division genes ftsQ-ftsA-ftsZ in Escherichia coli. (3/94)
Rapidly growing Escherichia coli is unable to divide in the presence of the antibiotic mecillinam, whose direct target is penicillin-binding protein 2 (PBP2), responsible for the elongation of the cylindrical portion of the cell wall. Division can be restored in the absence of PBP2 activity by increasing the concentration of the cell division proteins FtsQ, FtsA, and FtsZ. We tried to identify regulators of the ftsQ-ftsA-ftsZ operon among mecillinam-resistant mutants, which include strains overexpressing these genes. By insertional mutagenesis with mini-Tn10 elements, we selected for insertions that conferred mecillinam resistance. Among 15 such mutants, 7 suppressed the thermosensitivity of the ftsZ84(Ts) mutant, strongly suggesting that they had increased FtsZ activity. In all 7 cases, however, the mutants resulted from a duplication of the ftsQAZ region. These duplications seemed to result from multiple events, suggesting that no simple insertional inactivation can result in a mutant with sufficiently amplified ftsQAZ expression to confer mecillinam resistance. The structure of the duplications suggests a general method for constructing directed duplications of precise sequences. (+info)Affinities of beta-lactams for penicillin binding proteins of Chlamydia trachomatis and their antichlamydial activities. (4/94)
Binding affinities of beta-lactam antibiotics for the three penicillin binding proteins (PBPs) from Chlamydia trachomatis were determined in vitro and compared with their antichlamydial activities. Mecillinam selectively inhibited PBP1, with a 50% inhibitory concentration for PBP1 binding (0.2 microg/ml) similar to the MIC (0.1 microg/ml) and minimum bactericidal concentration (0.25 microg/ml). Although the other beta-lactams inhibited a wider range of PBPs than mecillinam, their antichlamydial activities were inferior to that of mecillinam. (+info)Constitutive septal murein synthesis in Escherichia coli with impaired activity of the morphogenetic proteins RodA and penicillin-binding protein 2. (5/94)
The pattern of peptidoglycan (murein) segregation in cells of Escherichia coli with impaired activity of the morphogenetic proteins penicillin-binding protein 2 and RodA has been investigated by the D-cysteine-biotin immunolabeling technique (M. A. de Pedro, J. C. Quintela, J.-V. Holtje, and H. Schwarz, J. Bacteriol. 179:2823-2834, 1997). Inactivation of these proteins either by amdinocillin treatment or by mutations in the corresponding genes, pbpA and rodA, respectively, leads to the generation of round, osmotically stable cells. In normal rod-shaped cells, new murein precursors are incorporated all over the lateral wall in a diffuse manner, being mixed up homogeneously with preexisting material, except during septation, when strictly localized murein synthesis occurs. In contrast, in rounded cells, incorporation of new precursors is apparently a zonal process, localized at positions at which division had previously taken place. Consequently, there is no mixing of new and old murein. Old murein is preserved for long periods of time in large, well-defined areas. We propose that the observed patterns are the result of a failure to switch off septal murein synthesis at the end of septation events. Furthermore, the segregation results confirm that round cells of rodA mutants do divide in alternate, perpendicular planes as previously proposed (K. J. Begg and W. D. Donachie, J. Bacteriol. 180:2564-2567, 1998). (+info)Novel S-benzylisothiourea compound that induces spherical cells in Escherichia coli probably by acting on a rod-shape-determining protein(s) other than penicillin-binding protein 2. (6/94)
Random screening for inhibitors of chromosome partitioning in Escherichia coli was done by the anucleate cell blue assay. A novel S-benzylisothiourea derivative, S-(3,4-dichlorobenzyl)isothiourea, tentatively named A22, was found to induce spherical cells and spherical anucleate cells in E. coli. Mecillinam, a specific inhibitor of penicillin-binding protein 2, which induces spherical cells in E. coli, also caused anucleate cell production. Spherical cells induced by treatment with either A22 or mecillinam varied in size, and anucleate cells seemed to be more frequent among the smaller cells. These results suggest that loss of the rod shape in E. coli leads to asymmetric cell division that results in production of anucleate cells. No competition was observed even in the presence of a 10-fold excess A22 in an in vitro assay of 14C-penicillin G binding, but mecillinam specifically inhibited binding of 14C-penicillin G to penicillin-binding protein 2. Simultaneous treatment with mecillinam and cephalexin, a specific inhibitor of penicillin-binding protein 3, induced lysis of E. coli cells, but a combination of A22 and cephalexin did not. These results suggest that the target molecule(s) of A22 was not penicillin-binding protein 2. A22 may act on a rod-shape-determining protein(s) other than penicillin-binding protein 2, such as RodA or MreB. (+info)Effects of sulfamethizole and amdinocillin against Escherichia coli strains (with various susceptibilities) in an ascending urinary tract infection mouse model. (7/94)
Resistance to antibiotics used for the treatment of urinary tract infections (UTIs) is increasing worldwide. The impact of in vitro resistance on clinical outcome in UTIs requires further study, since most studies of both humans and animals have evaluated only the efficacy of antibiotics toward bacteria susceptible in vitro. We were interested in evaluating the relationship between the in vitro antibacterial effect and the in vivo efficacy after antibiotic treatment. We simulated a natural ascending UTI by use of the ascending UTI mouse model and used Escherichia coli strains with various susceptibilities to amdinocillin (mecillinam) and sulfamethizole. Mice were treated for 3 days with antibiotic doses approximating human urinary tract concentrations after a standard oral dose. For a susceptible strain (MIC, 0.5 micro g/ml) and a resistant strain (MIC, 128 micro g/ml), respectively, there were significant reductions in bacterial counts in the urine, bladder, and kidneys after treatment with amdinocillin, whereas for a strain for which the MIC was 16 micro g/ml, there was a significant reduction in bacterial counts in the kidneys only (P < 0.05). Treatment with sulfamethizole resulted in a significant reduction in bacterial counts in all samples from a susceptible strain (MIC, 128 micro g/ml) and a resistant strain (MIC, 512 micro g/ml). Infection with a sulII gene-positive strain (MIC, >2,048 micro g/ml) could not be treated with sulfamethizole, as no effect could be demonstrated in the urine, bladder, or kidneys. For amdinocillin, there was no clear-cut relationship between the in vitro susceptibility and the in vivo outcome, while for sulfamethizole, we found a relationship between the MIC for the strain and the effect in the urinary tract. (+info)The pharmacokinetics of mecillinam and pivmecillinam in pregnant and non-pregnant women. (8/94)
1. The pharmacokinetics of parenteral mecillinam (n = 27) and oral pivmecillinam (n = 12) were studied in pregnant (n = 27) and non-pregnant (n = 12) subjects. 2. In early pregnancy (9-14 weeks of gestation) the mean peak plasma drug concentration (Cmax = 19 +/- 9 micrograms ml-1) after an intravenous injection of 200 mg mecillinam was significantly lower (P less than 0.05) and the volume of distribution (V = 49 +/- 20.1) significantly larger (P less than 0.05) than in non-pregnant subjects (Cmax = 35 +/- 18 micrograms ml-1, V = 29 +/- 12.1). In late pregnancy (39-40 weeks of gestation) the plasma mean peak concentration (Cmax = (29 +/- 14 micrograms ml-1) after parenteral administration of 200 mg mecillinam was slightly lower and the volume of distribution (V = 65 +/- 29.1, V = 0.9 +/- 0.4 l kg-1) significantly larger than that in non-pregnant subjects (V = 0.4 +/- 0.3 l kg-1). Also after oral administration of 200 mg pivmecillinam, equimolar to 136.5 mg mecillinam, the mean peak plasma concentration in pregnant subjects (Cmax = 1.8 +/- 1.2 micrograms ml-1) was slightly lower than that in non-pregnant subjects (Cmax = 1.7 +/- 1.2 micrograms ml-1). 3. The mean half-life of elimination after parenteral administration of mecillinam was significantly longer during both early (t1/2,Z = 133 +/- 38 min, P less than 0.05) and late pregnancy (t1/2,Z = 107 +/- 41 min, P less than 0.05) as compared with the non-pregnant state (t1/2,Z = 75 +/- 21 min).(ABSTRACT TRUNCATED AT 250 WORDS) (+info)
Amdinocillin (Mecillinam) Resistance Mutations in Clinical Isolates and Laboratory-Selected Mutants of Escherichia coli |...
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Mecillinam
... (INN) or amdinocillin (USAN) is an extended-spectrum penicillin antibiotic of the amidinopenicillin class that binds ... Neu HC (1985). "Amdinocillin: a novel penicillin. Antibacterial activity, pharmacology and clinical use". Pharmacotherapy. 5 (1 ... Pham P, Bartlett JG (August 28, 2008). "Amdinocillin (Mecillinam)". Point-of-Care Information Technology ABX Guide. Johns ...
Chlortetracycline
The therapeutic efficacy of mecillinam (amdinocillin), amoxicillin, and ampicillin can be decreased when used in combination ...
Sulfamethizole
Kerrn M, Frimodt-Møller N, Espersen F (2003). "Effects of Sulfamethizole and Amdinocillin against Escherichia coli Strains ( ...
Pivmecillinam
... (INN) or amdinocillin pivoxil (USAN, trade names Selexid, Penomax and Coactabs) is an orally active prodrug of ...
List of MeSH codes (D03)
... amdinocillin MeSH D03.438.260.825.124.036 - amdinocillin pivoxil MeSH D03.438.260.825.249 - cyclacillin MeSH D03.438.260.825. ... amdinocillin MeSH D03.605.084.737.124.036 - amdinocillin pivoxil MeSH D03.605.084.737.249 - cyclacillin MeSH D03.605.084.737. ...
List of MeSH codes (D02)
... amdinocillin MeSH D02.065.589.099.750.124.036 - amdinocillin pivoxil MeSH D02.065.589.099.750.249 - cyclacillin MeSH D02.065. ...
Amdinocillin Pivoxil
Amdinocillin - SUPP.AI by AI2
2H12]-Amdinocillin | 32887-01-7 unlabeled | Stable labeled standards | Alsachim
Mecillinam (Amdinocillin) - Structure, Properties, uses, Synthesis | Synthesis and Drug Profile | penicillin
Bupropion (Oral Route) Before Using - Mayo Clinic
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.. Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.. ...
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MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
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MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
MESH TREE NUMBER CHANGES - 2008 MeSH
Role of β-lactamases and outer membrane proteins in multiple β-lactam resistance of Enterobacter cloacae - Fingerprint -...
Active1
- Amdinocillin is an active antibacterial against gram-negative bacteria. (alsachim.com)
PIVMECILLINAM1
- Pivmecillinam hydrochloride is active against gram-negative organisms and used as for amdinocillin. (xcessbio.com)