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Nemo kinase

Katarzyna Chmielarska Masoumi, Renée Daams, Wondossen Sime, Valentina Siino, Hengning Ke, Fredrik Levander, Ramin Massoumi
The Wnt signaling pathway is essential in regulating various cellular processes. Different mechanisms of inhibition for Wnt signaling have been proposed. Besides β-catenin degradation, through the proteasome, nemo-like kinase (NLK) is another molecule that is known to negatively regulate Wnt signaling. However, the mechanism by which NLK mediates the inhibition of Wnt signaling is not yet known. In the present study, we used primary embryonic fibroblast cells isolated from NLK-deficient mice and showed that these cells proliferate faster and have a shorter cell cycle compared with wild-type cells...
November 30, 2016: Molecular Biology of the Cell
Mutian Lv, Yaming Li, Xin Tian, Shundong Dai, Jing Sun, Guojiang Jin, Shenyi Jiang
Nemo-like kinase (NLK), an evolutionarily conserved serine/threonine kinase, has been recognized as a critical regulator of various cancers. In this study, we investigated the role of NLK in human small-cell lung cancer (SCLC), which is the most aggressive form of lung cancer. NLK expression was evaluated by quantitative real-time polymerase chain reaction in 20 paired fresh SCLC tissue samples and found to be noticeably elevated in tumor tissues. Lentivirus-mediated RNAi efficiently suppressed NLK expression in NCI-H446 cells, resulting in a significant reduction in cell viability and proliferation in vitro...
2016: Drug Design, Development and Therapy
Rahul Kumar, Anja Ciprianidis, Susanne Theiß, Herbert Steinbeißer, Lilian T Kaufmann
The Wnt/planar cell polarity (PCP) pathway directs cell migration during vertebrate gastrulation and is essential for proper embryonic development. Paraxial protocadherin (PAPC, Gene Symbol pcdh8.2) is an important activator of Wnt/PCP signaling during Xenopus gastrulation, but how PAPC activity is controlled is incompletely understood. Here we show that Nemo-like kinase 1 (Nlk1), an atypical mitogen-activated protein (MAP) kinase, physically associates with the C-terminus of PAPC. This interaction mutually stabilizes both proteins by inhibiting polyubiquitination...
October 28, 2016: Differentiation; Research in Biological Diversity
N Liu, H G Shi, W Zhang, B Gu
Objective: To investigate the crosstalk between canonical Wnt/β-catenin and noncanonical Wnt/Ca(2+) pathway in osteoblast differentiation process of periodontal ligament stem cell (PDLSC) in inflammatory microenvironments. Methods: PDLSCs were obtained from human healthy individuals(H-PDLSC) and patients with periodontitis(P-PDLSC). The H/P-PDLSCs were transfected with β-catenin siRNA. Cell morphology was observed under fluorescent microscope and transfection efficiency was easured by Western blotting after transfection of PDLSC...
November 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
Yong-Kang Yang, Chao Yang, Waipan Chan, Zhaoquan Wang, Katelynn E Deibel, Joel L Pomerantz
The activation of NF-κB downstream of T Cell Receptor (TCR) engagement is a key signaling step required for normal lymphocyte function during the adaptive immune response. During TCR signaling, the adaptor protein Bcl10 is inducibly recruited to the CARD11 scaffold protein as part of a multicomponent complex that induces IKK kinase activity and NF-κB activation. Here we show that a consequence of this recruitment is the TCR-induced conjugation of Bcl10 with linear-linked polyubiquitin chains, to generate the signaling intermediate Lin(Ub)n-Bcl10, which is required for the association of Bcl10 with the NEMO subunit of the IKK complex...
October 24, 2016: Journal of Biological Chemistry
Ruijie Liu, Hadi Khalil, Suh-Chin J Lin, Michelle A Sargent, Allen J York, Jeffery D Molkentin
Nemo-like kinase (NLK) is an evolutionary conserved serine/threonine protein kinase implicated in development, proliferation and apoptosis regulation. Here we identified NLK as a gene product induced in the hearts of mice subjected to pressure overload or myocardial infarction injury, suggesting a potential regulatory role with pathological stimulation to this organ. To examine the potential functional consequences of increased NLK levels, cardiac-specific transgenic mice with inducible expression of this gene product were generated, as well as cardiac-specific Nlk gene-deleted mice...
2016: PloS One
Xiaoguang Li, Na Liu, Yizhu Wang, Jinglong Liu, Haigang Shi, Zhenzhen Qu, Tingting Du, Bin Guo, Bin Gu
Type 2 diabetes mellitus (T2DM) is associated with inhibited osteogenesis of bone marrow mesenchymal stem cells (BMSCs). Brain and muscle ARNT-like protein 1 (BMAL1) has been linked to the T2DM-related bone remodeling, however, the specific mechanism is still unclear. Herein, we aimed to determine the role of BMAL1 in T2DM-induced suppression of BMSCs osteogenesis. Inhibited osteogenesis and BMAL1 expression were showed in diabetic BMSCs. And while β-catenin and T cell factor (TCF) expression were decreased, the glycogen synthase kinase-3β (GSK-3β) and nemo-like kinase (NLK) expression were increased in diabetic BMSCs...
October 4, 2016: Molecular and Cellular Endocrinology
Linlin Guo, Hannah Heejung Lee, María de Las Mercedes Noriega, Hans-Joachim Paust, Gunther Zahner, Friedrich Thaiss
Acute kidney injury (AKI) is associated with poor patient outcome and a global burden for end-stage renal disease. Ischemia-reperfusion injury (IRI) is one of the major causes of AKI, and experimental work has revealed many details of the inflammatory response in the kidney. Here, we investigated whether deletion of the NF-κB kinases IKK2 or NEMO in lymphocytes or systemic inhibition of IKK2 would cause different kidney inflammatory responses after IRI induction. Serum creatinine, BUN level and renal tubular injury score were significantly increased in CD4creIKK2f/f (CD4xIKK2Δ) and CD4creNEMOf/f (CD4xNEMOΔ) mice compared with CD4cre mice after IRI induction...
August 31, 2016: American Journal of Physiology. Renal Physiology
Xu Yan, Jianxun Liu, Hongjin Wu, Yuna Liu, Sidao Zheng, Chengying Zhang, Cui Yang
BACKGROUND/AIMS: Ginsenoside Rb1 (GS-Rb1) is one of the most important active pharmacological extracts of the Traditional Chinese Medicine ginseng, with extensive evidence of its cardioprotective properties. Mir-208 has been shown to act as a biomarker of acute myocardial infarction in vivo studies including man. However the impact of miR-208 on the protective effect of GS-Rb1 in hypoxia/ischemia injured cardiomyocytes remains unclear. The current study aims to investigate the target gene of miR-208 and the impact on the protective effect of GS-Rb1 in hypoxia/ischemia (H/I) injuried cardiomyocytes...
2016: Cellular Physiology and Biochemistry
Alessandra Pescatore, Elio Esposito, Peter Draber, Henning Walczak, Matilde Valeria Ursini
Incontinentia Pigmenti (IP) is a rare X-linked disease characterized by early male lethality and multiple abnormalities in heterozygous females. IP is caused by NF-κB essential modulator (NEMO) mutations. The current mechanistic model suggests that NEMO functions as a crucial component mediating the recruitment of the IκB-kinase (IKK) complex to tumor necrosis factor receptor 1 (TNF-R1), thus allowing activation of the pro-survival NF-κB response. However, recent studies have suggested that gene activation and cell death inhibition are two independent activities of NEMO...
August 25, 2016: Cell Death & Disease
Lap Kwan Chan, Melanie Gerstenlauer, Björn Konukiewitz, Katja Steiger, Wilko Weichert, Thomas Wirth, Harald Jakob Maier
OBJECTIVE: Inhibitory κB kinase (IKK)/nuclear factor κB (NF-κB) signalling has been implicated in the pathogenesis of pancreatitis, but its precise function has remained controversial. Here, we analyse the contribution of IKK/NF-κB signalling in epithelial cells to the pathogenesis of pancreatitis by targeting the IKK subunit NF-κB essential modulator (NEMO) (IKKγ), which is essential for canonical NF-κB activation. DESIGN: Mice with a targeted deletion of NEMO in the pancreas were subjected to caerulein pancreatitis...
July 27, 2016: Gut
Christiane Koppe, Patricia Verheugd, Jérémie Gautheron, Florian Reisinger, Karina Kreggenwinkel, Christoph Roderburg, Luca Quagliata, Luigi Terracciano, Nikolaus Gassler, René H Tolba, Yannick Boege, Achim Weber, Michael Karin, Mark Luedde, Ulf P Neumann, Ralf Weiskirchen, Frank Tacke, Mihael Vucur, Christian Trautwein, Bernhard Lüscher, Christian Preisinger, Mathias Heikenwalder, Tom Luedde
UNLABELLED: The IκB-Kinase (IKK) complex-consisting of the catalytic subunits, IKKα and IKKβ, as well as the regulatory subunit, NEMO-mediates activation of the nuclear factor κB (NF-κB) pathway, but previous studies suggested the existence of NF-κB-independent functions of IKK subunits with potential impact on liver physiology and disease. Programmed cell death is a crucial factor in the progression of liver diseases, and receptor-interacting kinases (RIPKs) exerts strategic control over multiple pathways involved in regulating novel programmed cell-death pathways and inflammation...
October 2016: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
Sharmistha Dam, Michael Kracht, Stephan Pleschka, M Lienhard Schmitz
UNLABELLED: The role of NF-κB in influenza A virus (IAV) infection does not reveal a coherent picture, as pro- and also antiviral functions of this transcription factor have been described. To address this issue, we used clustered regularly interspaced short palindromic repeat with Cas9 (CRISPR-Cas9)-mediated genome engineering to generate murine MLE-15 cells lacking two essential components of the NF-κB pathway. Cells devoid of either the central NF-κB essential modulator (NEMO) scaffold protein and thus defective in IκB kinase (IKK) activation or cells not expressing the NF-κB DNA-binding and transactivation subunit p65 were tested for propagation of the SC35 virus, which has an avian host range, and its mouse-adapted variant, SC35M...
September 1, 2016: Journal of Virology
Emmanuel Derudder, Sebastian Herzog, Verena Labi, Tomoharu Yasuda, Karl Köchert, Martin Janz, Andreas Villunger, Marc Schmidt-Supprian, Klaus Rajewsky
Although canonical NF-κB signaling is crucial to generate a normal mature B-cell compartment, its role in the persistence of resting mature B cells is controversial. To resolve this conflict, we ablated NF-κB essential modulator (NEMO) and IκB kinase 2 (IKK2), two essential mediators of the canonical pathway, either early on in B-cell development or specifically in mature B cells. Early ablation severely inhibited the generation of all mature B-cell subsets, but follicular B-cell numbers could be largely rescued by ectopic expression of B-cell lymphoma 2 (Bcl2), despite a persisting block at the transitional stage...
May 3, 2016: Proceedings of the National Academy of Sciences of the United States of America
Pantaporn Supakankul, Supamit Mekchay
Nemo-like protein kinase (NLK) is a key enzyme in the noncanonical Wnt signaling pathway and it is involved in adipogenesis. In this study, the associations of the polymorphisms of the NLK gene with intramuscular fat (IMF) content and fatty acid (FA) composition traits were analyzed in crossbred commercial pigs. Three single nucleotide polymorphisms (SNPs) of the porcine NLK gene were identified in 5'-flanking region and introns, consisting of g.403739_403764insdel, g.574462T>C and g.630426A>G. The NLK g...
August 2016: Meat Science
Jian Wang, Zhi-Hong Yang, Hua Chen, Hua-Hui Li, Li-Yong Chen, Zhu Zhu, Ying Zou, Cong-Cong Ding, Jing Yang, Zhi-Wei He
BACKGROUND: Nurr1, a member of the orphan receptor family, plays an important role in several types of cancer. Our previous work demonstrated that increased expression of Nurr1 plays a significant role in the initiation and progression of prostate cancer (PCa), though the mechanisms for regulation of Nurr1 expression remain unknown. In this study, we investigated the hypothesis that Nemo-like kinase (NLK) is a key regulator of Nurr1 expression in PCa. METHODS: Immunohistochemistry and Western blot analysis were used to evaluate levels of NLK and Nurr1 in prostatic tissues and cell lines...
2016: BMC Cancer
Hengning Ke, Katarzyna Chmielarska Masoumi, Kristofer Ahlqvist, Michael J Seckl, Kristina Rydell-Törmänen, Ramin Massoumi
The canonical Wnt signaling can be silenced either through β-catenin-mediated ubiquitination and degradation or through phosphorylation of Tcf and Lef by nemo-like kinase (NLK). In the present study, we generated NLK deficient animals and found that these mice become cyanotic shortly before death because of lung maturation defects. NLK-/- lungs exhibited smaller and compressed alveoli and the mesenchyme remained thick and hyperplastic. This phenotype was caused by epithelial activation of vascular endothelial growth factor (VEGF) via recruitment of Lef1 to the promoter of VEGF...
2016: Scientific Reports
Katerina Vlantis, Andy Wullaert, Apostolos Polykratis, Vangelis Kondylis, Marius Dannappel, Robin Schwarzer, Patrick Welz, Teresa Corona, Henning Walczak, Falk Weih, Ulf Klein, Michelle Kelliher, Manolis Pasparakis
Intestinal epithelial cells (IECs) regulate gut immune homeostasis, and impaired epithelial responses are implicated in the pathogenesis of inflammatory bowel diseases (IBD). IEC-specific ablation of nuclear factor κB (NF-κB) essential modulator (NEMO) caused Paneth cell apoptosis and impaired antimicrobial factor expression in the ileum, as well as colonocyte apoptosis and microbiota-driven chronic inflammation in the colon. Combined RelA, c-Rel, and RelB deficiency in IECs caused Paneth cell apoptosis but not colitis, suggesting that NEMO prevents colon inflammation by NF-κB-independent functions...
March 15, 2016: Immunity
Mehdi Baratchian, Christopher A Davis, Akira Shimizu, David Escors, Claire Bagnéris, Tracey Barrett, Mary K Collins
The viral FLICE-like inhibitory protein (FLIP) protein from Kaposi sarcoma-associated herpesvirus activates the NF-κB pathway by forming a stable complex with a central region (amino acids 150-272) of the inhibitor of NF-κB kinase (IKK) γ subunits, thereby activating IKK. Cellular FLIP (cFLIP) forms are also known to activate the NF-κB pathway via IKK activation. Here we demonstrate that cFLIPL, cFLIPS, and their proteolytic product p22-FLIP all require the C-terminal region of NEMO/IKKγ (amino acids 272-419) and its ubiquitin binding function for activation of the IKK kinase (or kinase complex), but none form a stable complex with IKKγ...
April 1, 2016: Journal of Biological Chemistry
Ying Huang, Yang Yang, Yong He, Cheng Huang, Xiaoming Meng, Jun Li
INTRODUCTION: MicroRNA-208a (miR-208a) exacerbated cardiomyocyte apoptosis via inhibiting nemo-like kinase (NLK). miR-208a is a crucial molecule in the regulation of heart diseases, however, the biological function and underlying mechanism of miR-208a in the progression of cardiomyocyte apoptosis is not clearly elucidated. We hypothesized that miR-208a might potentiate cardiomyocyte apoptosis through inhibiting NLK. METHODS: Male Sprague-Dawley rats were underwent permanent coronary artery ligation to establish myocardial infarction (MI) model...
February 10, 2016: Current Pharmaceutical Design
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