Biomaterial Database

Effects of polymyxin B nonapeptide on Aeromonas salmonicida. 1987

R N McCashion, and W H Lynch

Department of Biology, University of New Brunswick, Fredericton, Canada.

In contrast to polymyxin B-susceptible gram-negative bacteria of human origin, the fish pathogen Aeromonas salmonicida was resistant to sensitization by polymyxin B nonapeptide (PMBN) to hydrophobic antibiotics. Similarly, sensitization of A. salmonicida strains by PMBN to the bactericidal action of brook trout (Salvelinus fontinalis) serum complement was less pronounced than the similar effect of PMBN against other gram-negative bacteria in certain mammalian sera. The surface array protein (A layer), overlying the outer membrane of virulent A. salmonicida strains, did not appear to cause resistance to PMBN sensitization since an A-layer-deficient mutant showed similar responses to PMBN as its parent strain. Electron micrographs of PMBN-treated A. salmonicida cells revealed very little visible outer membrane disruption when compared with the extensive blebbing on the outer membrane surface caused by PMBN in certain enteric bacteria, including Escherichia coli K-37. However, small extracellular vesiclelike components, which may have been derived from the outer membrane, were numerous around PMBN-treated A. salmonicida cells. In this connection, PMBN caused disruption of the A layer in the form of bulges, breaks, and detached fragments which appeared to be associated with the accumulation of these vesicles underneath the A layer of wild-type A. salmonicida strains.

UI	MeSH Term	Description	Entries
D008826	Microbial Sensitivity Tests	Any tests that demonstrate the relative efficacy of different chemotherapeutic agents against specific microorganisms (i.e., bacteria, fungi, viruses).	Bacterial Sensitivity Tests,Drug Sensitivity Assay, Microbial,Minimum Inhibitory Concentration,Antibacterial Susceptibility Breakpoint Determination,Antibiogram,Antimicrobial Susceptibility Breakpoint Determination,Bacterial Sensitivity Test,Breakpoint Determination, Antibacterial Susceptibility,Breakpoint Determination, Antimicrobial Susceptibility,Fungal Drug Sensitivity Tests,Fungus Drug Sensitivity Tests,Sensitivity Test, Bacterial,Sensitivity Tests, Bacterial,Test, Bacterial Sensitivity,Tests, Bacterial Sensitivity,Viral Drug Sensitivity Tests,Virus Drug Sensitivity Tests,Antibiograms,Concentration, Minimum Inhibitory,Concentrations, Minimum Inhibitory,Inhibitory Concentration, Minimum,Inhibitory Concentrations, Minimum,Microbial Sensitivity Test,Minimum Inhibitory Concentrations,Sensitivity Test, Microbial,Sensitivity Tests, Microbial,Test, Microbial Sensitivity,Tests, Microbial Sensitivity
D009675	Novobiocin	An antibiotic compound derived from Streptomyces niveus. It has a chemical structure similar to coumarin. Novobiocin binds to DNA gyrase, and blocks adenosine triphosphatase (ATPase) activity. (From Reynolds, Martindale The Extra Pharmacopoeia, 30th ed, p189)	Crystallinic Acid,Streptonivicin,Novobiocin Calcium,Novobiocin Sodium,Novobiocin, Monosodium Salt,Calcium, Novobiocin,Monosodium Salt Novobiocin,Sodium, Novobiocin
D010539	Permeability	Property of membranes and other structures to permit passage of light, heat, gases, liquids, metabolites, and mineral ions.	Permeabilities
D011112	Polymyxin B	A mixture of polymyxins B1 and B2, obtained from BACILLUS POLYMYXA strains. They are basic polypeptides of about eight amino acids and have cationic detergent action on cell membranes. Polymyxin B is used for treatment of infections with gram-negative bacteria, but may be neurotoxic and nephrotoxic.	Aerosporin,Polymyxin B Sulfate
D011113	Polymyxins	Basic lipopeptide antibiotic group obtained from Bacillus polymyxa. They affect the cell membrane by detergent action and may cause neuromuscular and kidney damage. At least eleven different members of the polymyxin group have been identified, each designated by a letter.	Polymyxin,Polymyxin M
D003023	Cloxacillin	A semi-synthetic antibiotic that is a chlorinated derivative of OXACILLIN.	Chloroxacillin,Sodium Cloxacillin,Cloxacillin Sodium,Syntarpen,Tegopen,Cloxacillin, Sodium,Sodium, Cloxacillin
D003165	Complement System Proteins	Serum glycoproteins participating in the host defense mechanism of COMPLEMENT ACTIVATION that creates the COMPLEMENT MEMBRANE ATTACK COMPLEX. Included are glycoproteins in the various pathways of complement activation (CLASSICAL COMPLEMENT PATHWAY; ALTERNATIVE COMPLEMENT PATHWAY; and LECTIN COMPLEMENT PATHWAY).	Complement Proteins,Complement,Complement Protein,Hemolytic Complement,Complement, Hemolytic,Protein, Complement,Proteins, Complement,Proteins, Complement System
D004917	Erythromycin	A bacteriostatic antibiotic macrolide produced by Streptomyces erythreus. Erythromycin A is considered its major active component. In sensitive organisms, it inhibits protein synthesis by binding to 50S ribosomal subunits. This binding process inhibits peptidyl transferase activity and interferes with translocation of amino acids during translation and assembly of proteins.	Erycette,Erymax,Erythromycin A,Erythromycin C,Erythromycin Lactate,Erythromycin Phosphate,Ilotycin,T-Stat,Lactate, Erythromycin,Phosphate, Erythromycin,T Stat,TStat
D005672	Fusidic Acid	An antibiotic isolated from the fermentation broth of Fusidium coccineum. (From Merck Index, 11th ed). It acts by inhibiting translocation during protein synthesis.	Fucithalmic,Fusidate Sodium,Fusidic Acid, Sodium Salt,Fusidin,Silver Fusidate,Sodium Fusidate,Stanicide,Acid, Fusidic,Fusidate, Silver,Fusidate, Sodium,Sodium, Fusidate
D000333	Aeromonas	A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that occurs singly, in pairs, or in short chains. Its organisms are found in fresh water and sewage and are pathogenic to humans, frogs, and fish.