title: [Characterization of imipenem resistance in Pseudomonas aeruginosa: decreased phenotypic expression of outer membrane proteins D1 and D2].
abstract: Imipenem-resistant variants can be selected from clinical Pseudomonas aeruginosa isolates in a frequency of 10(-8) to 10(-7) and 10(-5) in a single strain. In any case, there was no cross resistance between imipenem and other beta-lactams. In all IMI variants the induction potency of imipenem for the chromosomally-mediated Id beta-lactamase was markedly diminished as compared to the corresponding parent strains. Moreover, in all imipenem-resistant variants as well as in imipenem-resistant clinical isolates phenotypic expression of either a 46,000 dalton or a 47,000 dalton outer membrane protein was marginal; these proteins could be identified as proteins D1 and D2. These findings suggest a penetration barrier responsible for imipenem-resistance in Pseudomonas aeruginosa.
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics*; D004305:Dose-Response Relationship, Drug; D004352:Drug Resistance, Microbial; D005786:Gene Expression Regulation; D015378:Imipenem; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000235:genetics; D013845:Thienamycins / Q000494:pharmacology*
chemical_list: D001425:Bacterial Outer Membrane Proteins; D013845:Thienamycins; D015378:Imipenem
vernacular_title: Charakterisierung der Imipenem-Resistenz in Pseudomonas aeruginosa: Verminderte phänotypische Expression der äusseren Membranproteine D1 and D2.