Anaplasma phagocytophilumModulates gp91phoxGene Expression through Altered Interferon Regulatory Factor 1 and PU.1 Levels and Binding of CCAAT Displacement Protein
Open Access
- 1 January 2005
- journal article
- Published by American Society for Microbiology in Infection and Immunity
- Vol. 73 (1), 208-218
- https://doi.org/10.1128/iai.73.1.208-218.2005
Abstract
Infection of neutrophil precursors withAnaplasma phagocytophilum, the causative agent of human granulocytic ehrlichiosis, results in downregulation of the gp91phoxgene, a key component of NADPH oxidase. We now show that repression of gp91phoxgene transcription is associated with reduced expression of interferon regulatory factor 1 (IRF-1) and PU.1 in nuclear extracts ofA. phagocytophilum-infected cells. Loss of PU.1 and IRF-1 correlated with increased binding of the repressor, CCAAT displacement protein (CDP), to the promoter of the gp91phoxgene. Reduced protein expression of IRF-1 was observed with or without gamma interferon (IFN-γ) stimulation, and the defect in IFN-γ signaling was associated with diminished binding of phosphorylated Stat1 to the Stat1 binding element of the IRF-1 promoter. The diminished levels of activator proteins and enhanced binding of CDP account for the transcriptional inhibition of the gp91phoxgene duringA. phagocytophiluminfection, providing evidence of the first molecular mechanism that a pathogen uses to alter the regulation of genes that contribute to an effective respiratory burst.Keywords
This publication has 63 references indexed in Scilit:
- Protein inhibitor of activated signal transducer and activator of transcription (STAT)-1 (PIAS-1) regulates the IFN-γ response in macrophage cell linesCellular Signalling, 2002
- Cooperation of STAT-1 and IRF-1 in Interferon-γ-induced Transcription of the gp91 GenePublished by Elsevier BV ,2002
- The Matrix Attachment Region-binding Protein SATB1 Interacts with Multiple Elements within the gp91 Promoter and Is Down-regulated during Myeloid DifferentiationPublished by Elsevier BV ,2001
- Proper Nomenclature for the HGE AgentEmerging Infectious Diseases, 2001
- In vivo alterations of IFN regulatory factor-1 and PIAS1 protein levels in cystic fibrosis epitheliumJCI Insight, 2000
- Specific Processing of Poly(ADP-Ribose) Polymerase, Accompanied by Activation of Caspase-3 and Elevation/Reduction of Ceramide/Hydrogen Peroxide Levels, During Induction of Apoptosis in Host HL-60 Cells Infected by the Human Granulocytic Ehrlichiosis (HGE) AgentIUBMB Life, 2000
- Granulocytic ehrlichiosis: an emerging or rediscovered tick-borne disease?Journal of Medical Microbiology, 1998
- Cellular Changes and Induction of Apoptosis in Human Promyelocytic HL-60 Cells Infected with the Agent of Human Granulocytic Ehrlichiosis (HGE)Biochemical and Biophysical Research Communications, 1997
- Interferon Regulatory Factor-2 Directs Transcription from the gp91 PromoterPublished by Elsevier BV ,1996
- Chronic Granulomatous Disease: The Solving of a Clinical Riddle at the Molecular LevelClinical Immunology and Immunopathology, 1993