title: A human IL10 BAC transgene reveals tissue-specific control of IL-10 expression and alters disease outcome.
abstract: Interleukin (IL)-10 is an immunoregulatory cytokine that is produced by diverse cell populations. Studies in mice suggest that the cellular source of IL-10 is a key determinant in various disease pathologies, yet little is known regarding the control of tissue-specific human IL-10 expression. To assess cell type-specific human IL-10 regulation, we created a human IL-10 transgenic mouse with a bacterial artificial chromosome (hIL10BAC) in which the IL10 gene is positioned centrally. Since human IL-10 is biologically active in the mouse, we could examine the in vivo capacity of tissue-specific human IL-10 expression to recapitulate IL-10-dependent phenotypes by reconstituting Il10(-/-) mice (Il10(-/-)/hIL10BAC). In response to LPS, Il10(-/-)/hIL10BAC mice proficiently regulate IL-10-target genes and normalize sensitivity to LPS toxicity via faithful human IL-10 expression from macrophages and dendritic cells. However, in the Leishmania donovani model of pathogen persistence, Il10(-/-)/hIL10BAC mice did not develop the characteristic IL-10(+)IFN-gamma(+)CD4 T cell subset thought to mediate persistence and, like Il10(-/-) mice, cleared the parasites. Furthermore, the IL-10-promoting cytokine IL-27 failed to regulate transgenic human IL-10 production in CD4(+) T cells in vitro which together suggests that the hIL10BAC encodes for weak T cell-specific IL-10 expression. Thus, the hIL10BAC mouse is a model of human gene structure and function revealing tissue-specific regulatory requirements for IL-10 expression which impacts disease outcomes.
authors.affiliation: W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205-1901, USA.
authors.forename: Dilini
authors.initials: D
authors.lastname: Ranatunga
authors.forename: Christian M
authors.initials: CM
authors.lastname: Hedrich
authors.forename: Fengying
authors.initials: F
authors.lastname: Wang
authors.forename: Daniel W
authors.initials: DW
authors.lastname: McVicar
authors.forename: Nathan
authors.initials: N
authors.lastname: Nowak
authors.forename: Trupti
authors.initials: T
authors.lastname: Joshi
authors.forename: Lionel
authors.initials: L
authors.lastname: Feigenbaum
authors.forename: Lindsay R
authors.initials: LR
authors.lastname: Grant
authors.forename: Simona
authors.initials: S
authors.lastname: Stäger
authors.forename: Jay H
authors.initials: JH
authors.lastname: Bream
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002478:Cells, Cultured; D022202:Chromosomes, Artificial, Bacterial / Q000235:genetics*; D005260:Female; D005434:Flow Cytometry; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D016753:Interleukin-10 / Q000235:genetics* / Q000378:metabolism; D007893:Leishmania donovani / Q000254:growth & development; D007896:Leishmaniasis / Q000235:genetics / Q000378:metabolism / Q000469:parasitology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008099:Liver / Q000378:metabolism / Q000469:parasitology / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000378:metabolism / Q000469:parasitology / Q000473:pathology; D013601:T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D013950:Thymus Gland / Q000378:metabolism / Q000469:parasitology / Q000473:pathology
chemical_list: D008070:Lipopolysaccharides; D012333:RNA, Messenger; D016753:Interleukin-10