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Nfkbie-deficiency leads to increased susceptibility to develop B-cell lymphoproliferative disorders in aged mice. Blood Cancer J 2020; 10:38. [PMID: 32170099 PMCID: PMC7070037 DOI: 10.1038/s41408-020-0305-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 02/17/2020] [Accepted: 02/26/2020] [Indexed: 12/12/2022] Open
Abstract
Aberrant NF-κB activation is a hallmark of most B-cell malignancies. Recurrent inactivating somatic mutations in the NFKBIE gene, which encodes IκBε, an inhibitor of NF-κB-inducible activity, are reported in several B-cell malignancies with highest frequencies in chronic lymphocytic leukemia and primary mediastinal B-cell lymphoma, and account for a fraction of NF-κB pathway activation. The impact of NFKBIE deficiency on B-cell development and function remains, however, largely unknown. Here, we show that Nfkbie-deficient mice exhibit an amplification of marginal zone B cells and an expansion of B1 B-cell subsets. In germinal center (GC)-dependent immune response, Nfkbie deficiency triggers expansion of GC B-cells through increasing cell proliferation in a B-cell autonomous manner. We also show that Nfkbie deficiency results in hyperproliferation of a B1 B-cell subset and leads to increased NF-κB activation in these cells upon Toll-like receptor stimulation. Nfkbie deficiency cooperates with mutant MYD88 signaling and enhances B-cell proliferation in vitro. In aged mice, Nfkbie absence drives the development of an oligoclonal indolent B-cell lymphoproliferative disorders, resembling monoclonal B-cell lymphocytosis. Collectively, these findings shed light on an essential role of IκBε in finely tuning B-cell development and function.
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Puvabanditsin S, February M, Mayne J, McConnell J, Mehta R. Cleidocranial Dysplasia with 6p21.1-p12.3 Microdeletion: A Case Report and Literature Review. Cleft Palate Craniofac J 2018; 55:891-894. [PMID: 27500518 DOI: 10.1597/15-306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE The aim of this article is to publish a literature review and report on a new case of cleidocranial dysplasia syndrome with 6p21.1-p12.3 microdeletion. DESIGN A PubMed search using "cleidocranial dysplasia syndrome (CCD)" or "6p microdeletion" was performed. Articles with information relevant to our case were obtained for review. A new case of cleidocranial dysplasia syndrome is presented to describe and discuss clinical manifestations, pathogenesis, clinical progression of cleidocranial dysplasia syndrome, and management. RESULTS There were 22 articles with reports of cleidocranial dysplasia syndrome or 6p microdeletion. Cleidocranial dysplasia syndrome, a rare genetic disorder, documented to have an autosomal dominant inheritance pattern and caused by caused by mutations of the transcription factor RUNX2. RUNX2 has been mapped to chromosome 6p21. The anomalies in cleidocranial dysplasia syndrome can involve not only the clavicle and skull but the entire skeleton because the membranous as well as endochondral bone formation may be affected. Upon follow-up, our patient was found to have global developmental delay. CONCLUSIONS We report a near-term neonate with characteristic features of cleidocranial dysplasia and a 6p21.1-p12.3 microdeletion. Cleidocranial dysplasia syndrome is a rare autosomal dominant skeletal dysplasia. The mutation of the RUNX2 gene results in cleidocranial dysplasia syndrome.
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Hu M, Yuan X, Liu Y, Tang S, Miao J, Zhou Q, Chen S. IL-1β-induced NF-κB activation down-regulates miR-506 expression to promotes osteosarcoma cell growth through JAG1. Biomed Pharmacother 2017; 95:1147-1155. [PMID: 28926924 DOI: 10.1016/j.biopha.2017.08.120] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 08/26/2017] [Accepted: 08/28/2017] [Indexed: 01/01/2023] Open
Abstract
Nowadays, the role of miRNA in tumorigenesis has been largely reported. It was found that miR-506 might be associated with tumorigenesis of various cancers. The present study was aimed to investigate the character of miR-506 and some related factors in human osteosarcoma (OS) carcinogenesis. The expression level of miR-506 was downregulated in OS compared with the normal control group by RT-PCR, both in vivo and in vitro. In addition, IL-1β stimulation decreased the expression of miR-506. MiR-506 interfered with JAG1 gene transcription throughmiR-506 binding to the 3'-UTR region of JAG1 gene. Further siRNA strategy suggested that IL-1β may regulate miR-506 level via NF-κB, and then alter the JAG1 expression. Besides, the suppression of JAG1 by miR-506 inhibited OS cell proliferation. Taken together, our data indicate a process of NF-κB-induced miR-506 suppression and JAG1 upregulation upon IL-1β induction, which can be regarded as a new pathway for modulating cell proliferation via miR-506. It may be of clinical value in treating OS in the future.
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Affiliation(s)
- Minghua Hu
- Department of Anatomy, Histology and Embryology, Changsha Medical University, Changsha 410219,China
| | - Xianyu Yuan
- Changsha Medical University, Changsha, 410219,China
| | - Yangming Liu
- Department of Anatomy, Histology and Embryology, Changsha Medical University, Changsha 410219,China
| | - Shunsheng Tang
- Department of Anatomy, Histology and Embryology, Changsha Medical University, Changsha 410219,China
| | - Jinglei Miao
- Department of Orthopaedics, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, China.
| | - Qiliang Zhou
- Department of Anatomy, Histology and Embryology, Changsha Medical University, Changsha 410219,China.
| | - Shijie Chen
- Department of Orthopaedics, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, China.
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Su P, Liu X, Han Y, Zheng Z, Liu G, Li J, Li Q. Identification and characterization of a novel IκB-ε-like gene from lamprey (Lampetra japonica) with a role in immune response. FISH & SHELLFISH IMMUNOLOGY 2013; 35:1146-1154. [PMID: 23916539 DOI: 10.1016/j.fsi.2013.07.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 07/02/2013] [Accepted: 07/14/2013] [Indexed: 06/02/2023]
Abstract
Nuclear factor of kappa B (NF-κB) is a stimuli-activated transcription factor, regulates the expression of a diverse array of genes. Inhibitor of kappa B-epsilon (IκB-ε) is an inhibitor of NF-κB, which retains NF-κB in an inactive state in the cytoplasm. Lampreys (Lampetra japonica) belong to the lowest class of vertebrates with little information about its IκBs. We have identified a cDNA sequence IκB-ε-like in the lamprey and the deduced amino acid sequence of IκB-ε-like. It contains a conserved DSGxxS motif and six consecutive ankyrin repeats, which are necessary for signal-induced degradation of the molecule. Phylogenetic analysis indicated it had high sequence homology with IκB-εs from other vertebrates. FACS analysis showed that IκB-ε-like located in cytoplasm of leukocytes. The degradation of IκB-ε-like could be observed in leukocytes of L. japonica stimulated with lipopolysaccharide. These results indicate that IκB-ε proteins are conserved across vertebrates and the NF-κB-like signaling pathway may exist in the oldest agnatha.
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Affiliation(s)
- Peng Su
- College of Life Science, Liaoning Normal University, Dalian 116029, China
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6p21.2–p12.3 deletion detected by aCGH in an 8-year-old girl with cleidocranial dysplasia and developmental delay. Gene 2013; 523:99-102. [DOI: 10.1016/j.gene.2013.03.121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 03/22/2013] [Accepted: 03/27/2013] [Indexed: 12/17/2022]
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Hayden MS, Ghosh S. NF-κB, the first quarter-century: remarkable progress and outstanding questions. Genes Dev 2012; 26:203-34. [PMID: 22302935 DOI: 10.1101/gad.183434.111] [Citation(s) in RCA: 1284] [Impact Index Per Article: 107.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The ability to sense and adjust to the environment is crucial to life. For multicellular organisms, the ability to respond to external changes is essential not only for survival but also for normal development and physiology. Although signaling events can directly modify cellular function, typically signaling acts to alter transcriptional responses to generate both transient and sustained changes. Rapid, but transient, changes in gene expression are mediated by inducible transcription factors such as NF-κB. For the past 25 years, NF-κB has served as a paradigm for inducible transcription factors and has provided numerous insights into how signaling events influence gene expression and physiology. Since its discovery as a regulator of expression of the κ light chain gene in B cells, research on NF-κB continues to yield new insights into fundamental cellular processes. Advances in understanding the mechanisms that regulate NF-κB have been accompanied by progress in elucidating the biological significance of this transcription factor in various physiological processes. NF-κB likely plays the most prominent role in the development and function of the immune system and, not surprisingly, when dysregulated, contributes to the pathophysiology of inflammatory disease. As our appreciation of the fundamental role of inflammation in disease pathogenesis has increased, so too has the importance of NF-κB as a key regulatory molecule gained progressively greater significance. However, despite the tremendous progress that has been made in understanding the regulation of NF-κB, there is much that remains to be understood. In this review, we highlight both the progress that has been made and the fundamental questions that remain unanswered after 25 years of study.
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Affiliation(s)
- Matthew S Hayden
- Department of Microbiology and Immunology, College of Physicians and Surgeons, New York, New York 10032, USA
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Inhibitor of kappa B epsilon (IκBε) is a non-redundant regulator of c-Rel-dependent gene expression in murine T and B cells. PLoS One 2011; 6:e24504. [PMID: 21915344 PMCID: PMC3167847 DOI: 10.1371/journal.pone.0024504] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Accepted: 08/12/2011] [Indexed: 01/03/2023] Open
Abstract
Inhibitors of kappa B (IκBs) -α, -β and -ε effect selective regulation of specific nuclear factor of kappa B (NF-κB) dimers according to cell lineage, differentiation state or stimulus, in a manner that is not yet precisely defined. Lymphocyte antigen receptor ligation leads to degradation of all three IκBs but activation only of subsets of NF-κB-dependent genes, including those regulated by c-Rel, such as anti-apoptotic CD40 and BAFF-R on B cells, and interleukin-2 (IL-2) in T cells. We report that pre-culture of a mouse T cell line with tumour necrosis factor-α (TNF) inhibits IL-2 gene expression at the level of transcription through suppressive effects on NF-κB, AP-1 and NFAT transcription factor expression and function. Selective upregulation of IκBε and suppressed nuclear translocation of c-Rel were very marked in TNF-treated, compared to control cells, whether activated via T cell receptor (TCR) pathway or TNF receptor. IκBε associated with newly synthesised c-Rel in activated cells and, in contrast to IκBα and -β, showed enhanced association with p65/c-Rel in TNF-treated cells relative to controls. Studies in IκBε-deficient mice revealed that basal nuclear expression and nuclear translocation of c-Rel at early time-points of receptor ligation were higher in IκBε-/- T and B cells, compared to wild-type. IκBε-/- mice exhibited increased lymph node cellularity and enhanced basal thymidine incorporation by lymphoid cells ex vivo. IκBε-/- T cell blasts were primed for IL-2 expression, relative to wild-type. IκBε-/- splenic B cells showed enhanced survival ex vivo, compared to wild-type, and survival correlated with basal expression of CD40 and induced expression of CD40 and BAFF-R. Enhanced basal nuclear translocation of c-Rel, and upregulation of BAFF-R and CD40 occurred despite increased IκBα expression in IκBε-/- B cells. The data imply that regulation of these c-Rel-dependent lymphoid responses is a non-redundant function of IκBε.
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Kim D, Kolch W, Cho KH. Multiple roles of the NF-kappaB signaling pathway regulated by coupled negative feedback circuits. FASEB J 2009; 23:2796-802. [PMID: 19417085 DOI: 10.1096/fj.09-130369] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The NF-kappaB signaling pathway can perform multiple functional roles depending on specific cellular environments and cell types. Even in the same cell clones, the pathway can show different kinetic and phenotypic properties. It is believed that the complex networks controlling the NF-kappaB signaling pathway can generate these diverse and sometimes ambiguous phenomena. We noted, however, that the dynamics of NF-kappaB signaling pathway is highly stochastic and that the NF-kappaB signaling pathway contains multiple negative feedback circuits formed by IkappaB isoform proteins, IkappaBalpha and IkappaBepsilon in particular. Considering the topological similarity, their functional roles seem to be redundant, raising the question why different types of IkappaB isoforms need to exist. From extensive stochastic simulations of the NF-kappaB signaling pathway, we found that each IkappaB isoform actually conducts a different regulatory role through its own negative feedback. Specifically, our data suggest that IkappaBalpha controls the dynamic patterns of nuclear NF-kappaB, while IkappaBepsilon induces cellular heterogeneity of the NF-kappaB activities. These results may provide an answer to the question of how a single NF-kappaB signaling pathway can perform multiple biological functions even in the same clonal populations.
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Affiliation(s)
- Dongsan Kim
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
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Souvannavong V, Saidji N, Chaby R. Lipopolysaccharide from Salmonella enterica activates NF-kappaB through both classical and alternative pathways in primary B Lymphocytes. Infect Immun 2007; 75:4998-5003. [PMID: 17698569 PMCID: PMC2044549 DOI: 10.1128/iai.00545-07] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Lipopolysaccharides (LPS) are potent polyclonal B-lymphocyte activators. Recently, we have shown that LPS inhibits both spontaneous and drug-induced apoptosis in mature B lymphocytes, through cytosolic retention of Bax, a proapoptotic protein of the Bcl-2 family, by preventing its translocation to mitochondria. Research within the last few years has revealed that members of the NF-kappaB transcription factor regulate cell viability by activating genes involved in mitochondrion-dependent apoptosis. In this report, we examined the effect of sustained LPS stimulation on cytosolic and nuclear proteins of the IkappaB/NF-kappaB family to determine which NF-kappaB pathway, canonical (classical) or noncanonical (alternative), is activated by this agent in mature B cells. Immunoblotting analyses showed that LPS induced a time-dependent degradation of the NF-kappaB inhibitors IkappaBbeta and IkappaBepsilon (preferentially to isoform IkappaBalpha), via IkappaB kinase beta. In addition, we observed that LPS triggered the processing of NF-kappaB p105 to p50 and that of NF-kappaB p100 to p52 in parallel with nuclear translocation of active p50 and p52, as NF-kappaBp50/RelA and NF-kappaBp52/RelB heterodimers, respectively. These results suggest that sustained stimulation with LPS can activate NF-kappaB through both classical and alternative pathways.
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Affiliation(s)
- Vongthip Souvannavong
- CNRS, Institut de Biochimie Biophysique Moléculaire et Cellulaire, UMR 8619, Université Paris-Sud, Bat. 430, 91405 Orsay cedex, France.
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Kearns JD, Basak S, Werner SL, Huang CS, Hoffmann A. IkappaBepsilon provides negative feedback to control NF-kappaB oscillations, signaling dynamics, and inflammatory gene expression. ACTA ACUST UNITED AC 2006; 173:659-64. [PMID: 16735576 PMCID: PMC2063883 DOI: 10.1083/jcb.200510155] [Citation(s) in RCA: 168] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
NF-κB signaling is known to be critically regulated by the NF-κB–inducible inhibitor protein IκBα. The resulting negative feedback has been shown to produce a propensity for oscillations in NF-κB activity. We report integrated experimental and computational studies that demonstrate that another IκB isoform, IκBɛ, also provides negative feedback on NF-κB activity, but with distinct functional consequences. Upon stimulation, NF-κB–induced transcription of IκBɛ is delayed, relative to that of IκBα, rendering the two negative feedback loops to be in antiphase. As a result, IκBɛ has a role in dampening IκBα-mediated oscillations during long-lasting NF-κB activity. Furthermore, we demonstrate the requirement of both of these distinct negative feedback regulators for the termination of NF-κB activity and NF-κB–mediated gene expression in response to transient stimulation. Our findings extend the capabilities of a computational model of IκB–NF-κB signaling and reveal a novel regulatory module of two antiphase negative feedback loops that allows for the fine-tuning of the dynamics of a mammalian signaling pathway.
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Affiliation(s)
- Jeffrey D Kearns
- Signaling Systems Laboratory, Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
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