title: Cutting edge: microbial products elicit formation of dendritic cell aggresome-like induced structures in macrophages.
abstract: In response to a maturation stimulus, dendritic cells undergo the formation of ubiquitinated protein aggregates known as dendritic cell aggresome-like induced structures (DALIS). DALIS are thought to act as Ag storage structures, allowing for the prioritized degradation of proteins during infection. In this study, we demonstrate that murine macrophages can also form ubiquitinated protein aggregates that are indistinguishable from DALIS. These were formed in a dose- and time-dependent manner, and in response to a variety of microbial products. Surprisingly, the proteasome did not accumulate on these ubiquitinated protein structures, further underlining the difference between DALIS and aggresomes. Our studies suggest that DALIS formation is important for the function of Ag-presenting immune cells during infection.
authors.affiliation: Infection, Immunity, Injury, and Repair Program, Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Veronica
authors.initials: V
authors.lastname: Canadien
authors.forename: Tracy
authors.initials: T
authors.lastname: Tan
authors.forename: Rachelle
authors.initials: R
authors.lastname: Zilber
authors.forename: Jason
authors.initials: J
authors.lastname: Szeto
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Perrin
authors.forename: John H
authors.initials: JH
authors.lastname: Brumell
mesh_terms: D000818:Animals; D000938:Antigen-Presenting Cells / Q000201:enzymology / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D002460:Cell Line; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000201:enzymology / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology*; D006367:HeLa Cells; D006801:Humans; D008089:Listeria monocytogenes / Q000276:immunology; D008264:Macrophages / Q000201:enzymology / Q000276:immunology / Q000378:metabolism* / Q000382:microbiology*; D051379:Mice; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D051381:Rats; D012486:Salmonella typhimurium / Q000276:immunology; D014162:Transfection; D025801:Ubiquitin / Q000235:genetics / Q000378:metabolism
chemical_list: D025801:Ubiquitin; D046988:Proteasome Endopeptidase Complex