Consequences of chronic bacterial infection in Drosophila melanogaster


Autoři: Moria Cairns Chambers aff001;  Eliana Jacobson aff001;  Sarah Khalil aff001;  Brian P. Lazzaro aff001
Působiště autorů: Department of Entomology, Cornell University, Ithaca, New York, United States of America aff001;  Department of Biology, Bucknell University, Lewisburg, PA, United States of America aff002;  Cornell Institute of Host-Microbe Interactions and Disease, Cornell University, Ithaca, New York, United States of America aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224440

Souhrn

Even when successfully surviving an infection, a host often fails to eliminate a pathogen completely and may sustain substantial pathogen burden for the remainder of its life. Using systemic bacterial infection in Drosophila melanogaster, we characterize chronic infection by three bacterial species from different genera - Providencia rettgeri, Serratia marcescens, and Enterococcus faecalis–following inoculation with a range of doses. To assess the consequences of these chronic infections, we determined the expression of antimicrobial peptide genes, survival of secondary infection, and starvation resistance after one week of infection. While higher infectious doses unsurprisingly lead to higher risk of death, they also result in higher chronic bacterial loads among the survivors for all three infections. All three chronic infections caused significantly elevated expression of antimicrobial peptide genes at one week post-infection and provided generalized protection again secondary bacterial infection. Only P. rettgeri infection significantly influenced resistance to starvation, with persistently infected flies dying more quickly under starvation conditions relative to controls. These results suggest that there is potentially a generalized mechanism of protection against secondary infection, but that other impacts on host physiology may depend on the specific pathogen. We propose that chronic infections in D. melanogaster could be a valuable tool for studying tolerance of infection, including impacts on host physiology and behavior.

Klíčová slova:

Bacterial diseases – Drosophila melanogaster – Enterococcus faecalis – Enterococcus infections – Gene expression – Pathogens – Serratia marcescens – Serratia infections


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2019 Číslo 10