title: Occurrence of antipseudomonal beta-lactams and aminoglycosides resistance in Pseudomonas aeruginosa during therapy.
abstract: Four strains of Pseudomonas aeruginosa clinical isolates were studied for resistance to antipseudomonal beta-lactams and aminoglycosides. Two of these strains were isolated from two different patients before antibiotic treatment, the other two strains, isolated during therapy, developed resistance to many of antipseudomonal beta-lactams and, in addition, to aminoglycoside antibiotics. All the strains produced a constitutive chromosomal beta-lactamase, while the latter two showed a significant reduction in permeability coefficient. Thus, a permeability change may be the major factor involved in the resistance to most antipseudomonal beta-lactams and may be responsible for development of cross-resistance to aminoglycosides.
mesh_terms: D000617:Aminoglycosides / Q000378:metabolism / Q000494:pharmacology / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000378:metabolism / Q000494:pharmacology* / Q000627:therapeutic use; D002463:Cell Membrane Permeability; D004352:Drug Resistance, Microbial; D006801:Humans; D009154:Mutation; D011552:Pseudomonas Infections / Q000188:drug therapy / Q000382:microbiology; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D001618:beta-Lactamases / Q000096:biosynthesis; D047090:beta-Lactams
chemical_list: D000617:Aminoglycosides; D000900:Anti-Bacterial Agents; D047090:beta-Lactams; D001618:beta-Lactamases