Unknown,Transcriptomics,Genomics,Proteomics

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Myeloid cell expression of COMMD1 is required to restrain pro-inflammatory gene expression and tissue inflammation

ABSTRACT: Inflammation is a hallmark of multiple disease processes, including inflammatory bowel disease (IBD). The transcription factor NF-kappaB plays a critical role in this response through its effects on pro-inflammatory gene expression. Consequently, homeostatic mechanisms that control NF-kappaB activity have been found to play important roles in controlling inflammatory responses in physiologic and pathologic states. Copper Metabolism Murr1 Domain containing 1 (COMMD1), a regulator of copper excretion and other transport pathways, has been shown to play a role in limiting NF-kappaB activation. However, it remains unclear if this factor plays a necessary role in the control of inflammation or in the pathogenesis of inflammatory disorders in vivo. Using a myeloid-cell specific model of Commd1 deficiency in mice we evaluated the contribution of this factor to inflammatory responses. We found that this gene plays an important role as a negative regulator of the LPS transcriptional response, and deficiency in this factor led to sensitization to in vivo models of sepsis. In addition, we identified single nucleotide variants located near COMMD1 that are associated with decreased expression of this gene in humans. Interestingly, these polymorphisms also show a suggestive association signal with ulcerative colitis risk. Consistent with the possibility that genetic variation in COMMD1 expression may predispose to colitis, we find that myeloid deletion of Commd1 leads to more severe colonic inflammation and cancer progression in experimental colitis models. Altogether, the data support the notion that COMMD1 expression in myeloid cells plays an important anti-inflammatory role in physiologic states and human disease. Bone marrow derived macrophages (BMDM) were isolated from two individual wildtype - and two Commd1 knockout mice. Cells from individual mice were splitted and were treated with LPS for 3h, 24h, or, were left untreated. The corresponding 12 cell samples were subjected to total RNA preparation and subsequently used for Single-Color-based Microarray Analysis (Agilent Technologies).

ORGANISM(S): Mus musculus

SUBMITTER: Oliver Dittrich-Breiholz

PROVIDER: E-GEOD-53368 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Classical Hodgkin lymphoma (cHL) is one of the most common malignant lymphomas. It is characterized by the presence of rare Hodgkin and Reed/Sternberg (HRS) cells embedded in an extensive inflammatory infiltrate. Constitutive activation of nuclear factor-kappaB (NF-kappaB) in HRS cells which transcriptionally regulates expression of multiple anti-apoptotic factors and pro-inflammatory cytokines plays a central role in the pathogenesis of cHL (1, 2). In non-stimulated condition, NF-kappaB proteins are rendered inactive by binding to their inhibitors (IkappaB s), which sequester them in the cytoplasm. Stimulation of multiple receptors activates the IkappaB kinase (IKK) complex that phosphorylates IkappaB at two specific serine residues, followed by its ubiquitination and proteasomal degradation, thereby releasing NF-kappaB proteins and allowing their nuclear translocation (3). Recently, two studies provided further insights into the molecular mechanisms of IKK activation upon TNF stimulation (4, 5). Activation of the IKK complex and subsequent NF-kappaB activation requires Lys63 polyubiquitination of RIP1, a kinase which is recruited to the receptor upon TNF stimulation. IKK-ï§ï (NEMO), the regulatory subunit of the IKK complex, specifically recognizes these Lys63-linked polyubiquitins attached to RIP1 and thereby activates IKK and NF-kappaB (4, 5). A20 is an ubiquitin-modifying enzyme that inhibits NF-kappaB activation in succession of tumor necrosis factor (TNF) receptor and Toll-like receptor induced signals (6-8). This enzyme removes Lys63 linked ubiquitin chains from RIP1 and adds Lys48 polyubiquitins to RIP1, thereby targeting this factor for proteasomal degradation, thus explaining the molecular mechanism of NF-kappaB inhibition by A20 (6). A20 likely inhibits NF-kappaB acitivity also by additional means, including interaction with TRAF1 and TRAF2 (9). SNP 6.0 array (Affymetrix) analyses were performed according to the manufacturer's directions on DNA extracted from three Hodgkin cell lines (L1236, HDLM-2, U-HO1), HapMap samples included in the Genotyping Console Software 3.0 were used as references.

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Myeloid cell expression of COMMD1 is required to restrain pro-inflammatory gene expression and tissue inflammation

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