TitleMycobacterium avium ssp. hominissuis biofilm is composed of distinct phenotypes and influenced by the presence of antimicrobials.
Publication TypeJournal Article
Year of Publication2011
AuthorsMcNabe, M, Tennant, R, Danelishvili, L, Young, L, Bermudez, LE
JournalClin Microbiol Infect
Date Published2011 May
KeywordsAnimals, Anti-Bacterial Agents, Biofilms, Bronchiectasis, DNA-Binding Proteins, Drug Resistance, Bacterial, Lung, Mice, Mice, Inbred C57BL, Microbial Sensitivity Tests, Mycobacterium avium, Phenotype, Polymerase Chain Reaction

Mycobacterium avium ssp. hominissuis, hereafter referred to as M. avium, forms biofilm, a property that, in mice, is associated with lung infection via aerosol. As M. avium might co-inhabit the respiratory tract with other pathogens, treatment of the co-pathogen-associated infections, such as in bronchiectasis, would expose M. avium to therapeutic compounds that may have their origin in other organisms sharing the natural environments. Incubation of M. avium with two compounds produced by environmental organisms, streptomycin and tetracycline, in vitro at subinhibitory concentrations increased biofilm formation in a number of M. avium strains, although exposure to ampicillin, moxifloxacin, rifampin and trimethoprim-sulphamethoxazole had no effect on biofilm formation. No selection of genotypically resistant clones was observed. Although incubation of bacteria in the presence of streptomycin upregulates the expression of biofilm-associated genes, the response to the antibiotics had no association with the expression of a regulator (LysR) linked to the formation of biofilm in M. avium. Biofilms are composed of planktonic and sessile bacteria. Whereas planktonic M. avium is susceptible to clarithromycin and ethambutol (clinically used antimicrobials), sessile bacteria are at least three-fold to four-fold more resistant to antibiotics. The sessile phenotype, however, is reversible, and no selection of resistant clones was observed. Mice infected through the airway with both phenotypes were infected with a similar number of bacteria, demonstrating no phenotype advantage. M. avium biofilm formation is enhanced by commonly used compounds and, in the sessile bacterial phenotype, is resistant to clarithromycin and ethambutol, in a reversible manner.

Alternate JournalClin Microbiol Infect
PubMed ID20636426
PubMed Central IDPMC2978799
Grant ListN01AI25468 / AI / NIAID NIH HHS / United States
R01 AI043199 / AI / NIAID NIH HHS / United States
R01 AI043199-06A1 / AI / NIAID NIH HHS / United States
AI043199 / AI / NIAID NIH HHS / United States