Impaired IFN-gamma production in IFN regulatory factor-1 knockout mice during endotoxemia is secondary to a loss of both IL-12 and IL-12 receptor expression. 2000

C A Salkowski, and K E Thomas, and M J Cody, and S N Vogel
Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.

Mice with a targeted mutation in the gene that encodes the transcription factor IFN regulatory factor-1 (IRF-1) were used to assess the contribution of IRF-1 to IL-12-dependent and IL-12-independent pathways of IFN-gamma production. In response to LPS, IRF. 1-/- mice produced less IL-12 p40, IL-12 p35, and IFN-gamma mRNA in the liver than IRF-1+/+ mice. While pulmonary IFN-gamma mRNA levels were also mitigated in IRF-1-/- mice, pulmonary IL-12 p40 and IL-12 p35 mRNA were not dysregulated. Circulating IL-12 p70 and IFN-gamma levels were profoundly attenuated in LPS-challenged IRF-1-/- mice. Further analysis revealed a major deficiency in hepatic IL-12Rbeta1 and IL-12Rbeta2 mRNA expression as well as pulmonary IL-12Rbeta1 mRNA expression in LPS-challenged IRF-1-/- mice. In vitro, IFN-gamma up-regulated IL-12Rbeta1 mRNA in macrophages from IRF-1+/+, but not IRF-1-/-, mice. IFN-gamma-induced IL-12Rbeta2 mRNA expression was also diminished in macrophages from IRF-1-/- mice. In contrast to IRF-1+/+ mice, administration of exogenous IL-12 to IRF-1-/- mice resulted in reduced serum IFN-gamma and hepatic and pulmonary IFN-gamma mRNA, demonstrating that loss of IL-12R results in diminished IL-12 responsiveness. While LPS-challenged IRF-1-/- mice also had reduced IL-15 mRNA levels, serum IL-18 responses were intact. Finally, induction of IRF-1 mRNA by LPS in livers of IFN-gamma knockout mice were markedly attenuated, suggesting a feedback amplification loop. These studies indicate that IRF-1 deficiency disrupts both IL-12-dependent and -independent pathways of IFN-gamma production and that IRF-1 is a critical transcription factor involved in the regulation of not only IL-12, but also IL-12R.

UI MeSH Term Description Entries
D007153 Immunologic Deficiency Syndromes Syndromes in which there is a deficiency or defect in the mechanisms of immunity, either cellular or humoral. Antibody Deficiency Syndrome,Deficiency Syndrome, Immunologic,Deficiency Syndromes, Antibody,Deficiency Syndromes, Immunologic,Immunologic Deficiency Syndrome,Immunological Deficiency Syndromes,Antibody Deficiency Syndromes,Deficiency Syndrome, Antibody,Deficiency Syndrome, Immunological,Deficiency Syndromes, Immunological,Immunological Deficiency Syndrome,Syndrome, Antibody Deficiency,Syndrome, Immunologic Deficiency,Syndrome, Immunological Deficiency,Syndromes, Antibody Deficiency,Syndromes, Immunologic Deficiency,Syndromes, Immunological Deficiency
D007274 Injections, Intraperitoneal Forceful administration into the peritoneal cavity of liquid medication, nutrient, or other fluid through a hollow needle piercing the abdominal wall. Intraperitoneal Injections,Injection, Intraperitoneal,Intraperitoneal Injection
D007371 Interferon-gamma The major interferon produced by mitogenically or antigenically stimulated LYMPHOCYTES. It is structurally different from TYPE I INTERFERON and its major activity is immunoregulation. It has been implicated in the expression of CLASS II HISTOCOMPATIBILITY ANTIGENS in cells that do not normally produce them, leading to AUTOIMMUNE DISEASES. Interferon Type II,Interferon, Immune,gamma-Interferon,Interferon, gamma,Type II Interferon,Immune Interferon,Interferon, Type II
D008070 Lipopolysaccharides Lipid-containing polysaccharides which are endotoxins and important group-specific antigens. They are often derived from the cell wall of gram-negative bacteria and induce immunoglobulin secretion. The lipopolysaccharide molecule consists of three parts: LIPID A, core polysaccharide, and O-specific chains (O ANTIGENS). When derived from Escherichia coli, lipopolysaccharides serve as polyclonal B-cell mitogens commonly used in laboratory immunology. (From Dorland, 28th ed) Lipopolysaccharide,Lipoglycans
D008810 Mice, Inbred C57BL One of the first INBRED MOUSE STRAINS to be sequenced. This strain is commonly used as genetic background for transgenic mouse models. Refractory to many tumors, this strain is also preferred model for studying role of genetic variations in development of diseases. Mice, C57BL,Mouse, C57BL,Mouse, Inbred C57BL,C57BL Mice,C57BL Mice, Inbred,C57BL Mouse,C57BL Mouse, Inbred,Inbred C57BL Mice,Inbred C57BL Mouse
D010750 Phosphoproteins Phosphoprotein
D002478 Cells, Cultured Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others. Cultured Cells,Cell, Cultured,Cultured Cell
D004268 DNA-Binding Proteins Proteins which bind to DNA. The family includes proteins which bind to both double- and single-stranded DNA and also includes specific DNA binding proteins in serum which can be used as markers for malignant diseases. DNA Helix Destabilizing Proteins,DNA-Binding Protein,Single-Stranded DNA Binding Proteins,DNA Binding Protein,DNA Single-Stranded Binding Protein,SS DNA BP,Single-Stranded DNA-Binding Protein,Binding Protein, DNA,DNA Binding Proteins,DNA Single Stranded Binding Protein,DNA-Binding Protein, Single-Stranded,Protein, DNA-Binding,Single Stranded DNA Binding Protein,Single Stranded DNA Binding Proteins
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012333 RNA, Messenger RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated

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