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Adaptor protein 2

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https://www.readbyqxmd.com/read/28223944/il-1%C3%AE-induced-downregulation-of-the-multifunctional-pdz-adaptor-pdzk1-is-attenuated-by-erk-inhibition-rxr%C3%AE-or-ppar%C3%AE-stimulation-in-enterocytes
#1
Min Luo, Sunil Yeruva, Yongjian Liu, Giriprakash Chodisetti, Brigitte Riederer, Manoj B Menon, Keisuke Tachibana, Takefumi Doi, Ursula E Seidler
Background: The PDZ adaptor protein PDZK1 modulates the membrane expression and function of a variety of intestinal receptors and ion/nutrient transporters. Its expression is strongly decreased in inflamed intestinal mucosa of mice and IBD patients. Aim and Methods: We investigated whether the inflammation-associated PDZK1 downregulation is a direct consequence of proinflammatory cytokine release by treating intestinal Caco-2BBE cells with TNF-α, IFN-γ, and IL-1β, and analysing PDZK1 promotor activity, mRNA and protein expression...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28216678/the-cul3-spop-daxx-axis-is-a-novel-regulator-of-vegfr2-expression-in-vascular-endothelial-cells
#2
Tomohisa Sakaue, Iori Sakakibara, Takahiro Uesugi, Ayako Fujisaki, Koh-Ichi Nakashiro, Hiroyuki Hamakawa, Eiji Kubota, Takashi Joh, Yu-Ki Imai, Hironori Izutani, Shigeki Higashiyama
Vascular endothelial cell growth factor receptor 2 (VEGFR2) is an essential receptor for the homeostasis of endothelial cells. In this study, we showed that NEDD8-conjugated Cullin3 (CUL3)-based ubiquitin E3 (UbE3) ligase plays a crucial role in VEGFR2 mRNA expression. Human umbilical vein endothelial cells treated with MLN4924, an inhibitor of NEDD8-activating enzyme, or with CUL3 siRNA drastically lost their response to VEGF due to the intense decrease in VEGFR2 expression. Moreover, speckle-type POZ protein (SPOP) and death-domain associated protein (DAXX) were involved in the CUL3 UbE3 ligase complex as a substrate adaptor and a substrate, respectively...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28215140/position-based-nucleotide-analysis-of-mir168-family-in-higher-plants-and-its-targets-in-mammalian-transcripts
#3
Mohammed Javed, Manish Solanki, Anshika Sinha, Lata Israni Shukla
The conserved miR168 family is evaluated for position based nucleotide preference in higher plants. The mature miRNA sequences include miR168-5p and miR168-3p, were obtained from miRBase (v21, June 2014) for 15 families (28 plants) containing a-c subfamilies. The preferred position based nucleotide sequences were obtained for miR168-5p and miR168-3p using Data Analysis in Molecular Biology and Evolution (DAMBE). miR168-5p shows same nucleotides at positions 1-6, 8-9, 11-12, 15-17 and 19. Also, miR168-3p is present in 3 families (10 plants) shows the same nucleotide at position 1-11, 13-15 and 17-21...
February 15, 2017: MicroRNA
https://www.readbyqxmd.com/read/28214847/contribution-of-p62-to-phenotype-transition-of-coronary-arterial-myocytes-with-defective-autophagy
#4
Junxiang Bao, Guangbi Li, Xinxu Yuan, Erich Gulbins, Pin-Lan Li
BACKGROUND: Autophagy disorder contributes to dedifferentiation of arterial smooth muscle cells, but the mechanisms are poorly understood. Here, we sought to investigate the role of scaffolding adaptor p62/SQSTM1 (p62) in phenotype switching of mouse coronary arterial myocytes (CAMs) induced by CD38 gene deficiency or lysosomal dysfunction which blocks autophagic flux in the cells. METHODS: Protein expression was measured by western blot analysis and immunofluorescent staining...
3, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28211872/rictor-mtorc2-deficiency-enhances-keratinocyte-stress-tolerance-via-mitohormesis
#5
Beatrice Tassone, Stefania Saoncella, Francesco Neri, Ugo Ala, Davide Brusa, Mark A Magnuson, Paolo Provero, Salvatore Oliviero, Chiara Riganti, Enzo Calautti
How metabolic pathways required for epidermal tissue growth and remodeling influence the ability of keratinocytes to survive stressful conditions is still largely unknown. The mechanistic target of rapamycin complex 2 (mTORC2) regulates growth and metabolism of several tissues, but its functions in epidermal cells are poorly defined. Rictor is an adaptor protein essential for mTORC2 activity. To explore the roles of mTORC2 in the epidermis, we have conditionally deleted rictor in mice via K14-Cre-mediated homologous recombination and found that its deficiency causes moderate tissue hypoplasia, reduced keratinocyte proliferation and attenuated hyperplastic response to TPA...
February 17, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28195158/infection-derived-lipids-elicit-an-immune-deficiency-circuit-in-arthropods
#6
Dana K Shaw, Xiaowei Wang, Lindsey J Brown, Adela S Oliva Chávez, Kathryn E Reif, Alexis A Smith, Alison J Scott, Erin E McClure, Vishant M Boradia, Holly L Hammond, Eric J Sundberg, Greg A Snyder, Lei Liu, Kathleen DePonte, Margarita Villar, Massaro W Ueti, José de la Fuente, Robert K Ernst, Utpal Pal, Erol Fikrig, Joao H F Pedra
The insect immune deficiency (IMD) pathway resembles the tumour necrosis factor receptor network in mammals and senses diaminopimelic-type peptidoglycans present in Gram-negative bacteria. Whether unidentified chemical moieties activate the IMD signalling cascade remains unknown. Here, we show that infection-derived lipids 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG) and 1-palmitoyl-2-oleoyl diacylglycerol (PODAG) stimulate the IMD pathway of ticks. The tick IMD network protects against colonization by three distinct bacteria, that is the Lyme disease spirochete Borrelia burgdorferi and the rickettsial agents Anaplasma phagocytophilum and A...
February 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28188290/activated-cdc42-associated-kinase-1-ack1-binds-the-sam-domain-of-adaptor-slp-76-and-phosphorylates-proximal-tyrosines
#7
Youg R Thaker, Asha Recino, Monika Raab, Asma Jabeen, Maja Wallberg, Nelson Fernandez, Christopher E Rudd
The adaptor protein Src homology 2 domain-containing leukocyte phospho-protein of 76 kDa (SLP-76) plays a crucial role in T-cell activation by linking antigen receptor (TCR) signals to downstream pathways. At its N-terminus, SLP-76 has three key N-terminus tyrosines (Y113, Y128 and Y145, or 3Y) as well as a sterile-α motif (SAM) domain, whose function is unclear. We previously showed that the SAM domain has two binding regions that mediate dimer and oligomer formation. In this study, we have identified SAM domain-carrying non-receptor tyrosine kinase, activated Cdc42-associated tyrosine kinase 1 (ACK1; also known as Tnk2, tyrosine kinase non receptor 2), as a novel binding partner of SLP-76...
February 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28187742/regulatory-role-of-cytosolic-phospholipase-a2-alpha-in-the-induction-of-cd40-in-microglia
#8
Yafa Fetfet Malada-Edelstein, Nurit Hadad, Rachel Levy
BACKGROUND: The aberrant expression of CD40, a co-stimulatory receptor found on the antigen-presenting cells, is involved in the pathogenesis of various degenerative diseases. Our previous study demonstrated that the reduction of cytosolic phospholipase A2 alpha (cPLA2α) protein overexpression and activation in the spinal cord of a mouse model of ALS, hmSOD1 G93A, inhibited CD40 upregulation in microglia. The present study was designed to determine whether cPLA2α has a direct, participatory role in the molecular events leading to CD40 induction...
February 10, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28183853/mark4-inhibits-hippo-signaling-to-promote-proliferation-and-migration-of-breast-cancer-cells
#9
Emad Heidary Arash, Ahmed Shiban, Siyuan Song, Liliana Attisano
The Hippo pathway is a critical regulator of tissue size, and aberrations in pathway regulation lead to cancer. MST1/2 and LATS1/2 kinases comprise the core of the pathway that, in association with adaptor proteins SAV and MOB, functions in a sequential manner to phosphorylate and inhibit the transcription factors YAP and TAZ. Here we identify mammalian MARK family members as activators of YAP/TAZ. We show that depletion of MARK4 in MDA-MB-231 breast cancer cells results in the loss of nuclear YAP/TAZ and decreases the expression of YAP/TAZ targets...
February 9, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28181498/arrestin-biased-at1r-agonism-induces-acute-catecholamine-secretion-through-trpc3-coupling
#10
Chun-Hua Liu, Zheng Gong, Zong-Lai Liang, Zhi-Xin Liu, Fan Yang, Yu-Jing Sun, Ming-Liang Ma, Yi-Jing Wang, Chao-Ran Ji, Yu-Hong Wang, Mei-Jie Wang, Fu-Ai Cui, Amy Lin, Wen-Shuai Zheng, Dong-Fang He, Chang-Xiu Qu, Peng Xiao, Chuan-Yong Liu, Alex R B Thomsen, Thomas Joseph Cahill, Alem W Kahsai, Fan Yi, Kun-Hong Xiao, Tian Xue, Zhuan Zhou, Xiao Yu, Jin-Peng Sun
Acute hormone secretion triggered by G protein-coupled receptor (GPCR) activation underlies many fundamental physiological processes. GPCR signalling is negatively regulated by β-arrestins, adaptor molecules that also activate different intracellular signalling pathways. Here we reveal that TRV120027, a β-arrestin-1-biased agonist of the angiotensin II receptor type 1 (AT1R), stimulates acute catecholamine secretion through coupling with the transient receptor potential cation channel subfamily C 3 (TRPC3)...
February 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28176280/stepwise-casr-ap2s1-and-gna11-sequencing-in-patients-with-suspected-familial-hypocalciuric-hypercalcemia
#11
Auryan Szalat, Shoshana Shpitzen, Anat Tsur, Ilana Zalmon Koren, Shmuel Shilo, Liana Tripto-Shkolnik, Ronen Durst, Eran Leitersdorf, Vardiella Meiner
PURPOSE: Patients with familial hyperparathyroidism and low urinary calcium excretion may have familial hypocalciuric hypercalcemia (FHH) with mutations in one of three genes: the calcium-sensing receptor (CaSR) defining FHH-type 1, the adaptor-related protein complex 2 (AP2S1) related to FHH-type 3 or the G-protein subunit alpha11 (GNA11) associated with FHH-type 2. We aimed to evaluate the presence of mutations in these genes and to identify phenotypic specificities and differences in these patients...
February 7, 2017: Endocrine
https://www.readbyqxmd.com/read/28170369/lmo2-enhances-lamellipodia-filopodia-formation-in-basal-type-breast-cancer-cells-by-mediating-arp3-profilin1-interaction
#12
Ye Liu, Chao Wu, Tianhui Zhu, Wei Sun
BACKGROUND The human LMO2 gene was first cloned from an acute T lymphocytic leukemia patient; it is primarily expressed in hematopoietic and vascular endothelial systems, and functions as a pivotal transcriptional regulator during embryonic hematopoiesis and angiogenesis. However, some recent reports indicated that LMO2 is widely expressed in many tissues and tumors, predominantly in cytoplasm, and revealed complicated functions on tumor behaviors in a variety of cancer types. As an adaptor molecule, binding partners and function details of LMO2 in these solid tumors need to be further investigated...
February 7, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28168174/sh2-domain-containing-adaptor-protein-b-expressed-in-dendritic-cells-is-involved-in-t-cell-homeostasis-by-regulating-dendritic-cell-mediated-th2-immunity
#13
Md Selim Ahmed, Myeong-Ho Kang, Ezra Lee, Yujin Park, Yideul Jeong, Yong-Soo Bae
PURPOSE: The Src homology 2 domain-containing adaptor protein B (SHB) is widely expressed in immune cells and acts as an important regulator for hematopoietic cell function. SHB silencing induces Th2 immunity in mice. SHB is also involved in T-cell homeostasis in vivo. However, SHB has not yet been studied and addressed in association with dendritic cells (DCs). MATERIALS AND METHODS: The effects of SHB expression on the immunogenicity of DCs were assessed by Shb gene silencing in mouse bone marrow-derived DCs (BMDCs)...
January 2017: Clinical and Experimental Vaccine Research
https://www.readbyqxmd.com/read/28155844/enhanced-biocompatibility-of-neural-probes-by-integrating-microstructures-and-delivering-anti-inflammatory-agents-via-microfluidic-channels
#14
Bin Liu, Eric Kim, Anika Meggo, Sachin Gandhi, Hao Luo, Srinivas Kallakuri, Yong Xu, Jinsheng Zhang
OBJECTIVE: Biocompatibility is a major issue for chronic neural implants, involving inflammatory and wound healing responses of neurons and glial cells. To enhance biocompatibility, we developed silicon-parylene hybrid neural probes with open architecture electrodes, microfluidic channels and a reservoir for drug delivery to suppress tissue responses. APPROACH: We chronically implanted our neural probes in the rat auditory cortex and investigated (1) whether open architecture electrode reduces inflammatory reaction by measuring glial responses; and (2) whether delivery of antibiotic minocycline reduces inflammatory and tissue reaction...
February 3, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28139716/adaptor-protein-2-ap-2-complex-is-essential-for-functional-axogenesis-in-hippocampal-neurons
#15
Jae Won Kyung, In Ha Cho, Sukmook Lee, Woo Keun Song, Timothy A Ryan, Michael B Hoppa, Sung Hyun Kim
The complexity and diversity of a neural network requires regulated elongation and branching of axons, as well as the formation of synapses between neurons. In the present study we explore the role of AP-2, a key endocytic adaptor protein complex, in the development of rat hippocampal neurons. We found that the loss of AP-2 during the early stage of development resulted in impaired axon extension and failed maturation of the axon initial segment (AIS). Normally the AIS performs two tasks in concert, stabilizing neural polarity and generating action potentials...
January 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28132836/heme-oxygenase-2-binds-myristate-to-regulate-retrovirus-assembly-and-tlr4-signaling
#16
Yiping Zhu, Shukun Luo, Yosef Sabo, Cheng Wang, Liang Tong, Stephen P Goff
N-myristoylation is the covalent attachment of myristic acid to the N terminus of proteins in eukaryotic cells. The matrix domain (MA) of HIV-1 Gag protein is N-myristoylated and plays an important role in virus budding. In screening for host factors that interact with HIV-1 MA, we found that heme oxygenase (HO-2) specifically binds the myristate moiety of Gag. HO-2 was also found to bind TRAM, an adaptor protein for Toll-like receptor 4 (TLR4), and thereby impact both virus replication and cellular inflammatory responses...
February 8, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28130494/oxidized-low-density-lipoprotein-immune-complex-priming-of-the-nlrp3-inflammasome-involves-tlr-and-fc%C3%AE-r-cooperation-and-is-dependent-on-card9
#17
Jillian P Rhoads, John R Lukens, Ashley J Wilhelm, Jared L Moore, Yanice Mendez-Fernandez, Thirumala-Devi Kanneganti, Amy S Major
Oxidized low-density lipoprotein (oxLDL) is known to activate inflammatory responses in a variety of cells, especially macrophages and dendritic cells. Interestingly, much of the oxLDL in circulation is complexed to Abs, and these resulting immune complexes (ICs) are a prominent feature of chronic inflammatory disease, such as atherosclerosis, type-2 diabetes, systemic lupus erythematosus, and rheumatoid arthritis. Levels of oxLDL ICs often correlate with disease severity, and studies demonstrated that oxLDL ICs elicit potent inflammatory responses in macrophages...
March 1, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28130414/regulation-and-physiological-functions-of-mammalian-phospholipase-c
#18
REVIEW
Yoshikazu Nakamura, Kiyoko Fukami
PHOSPHOLIPASE C PLC IS A KEY ENZYME IN PHOSPHOINOSITIDE METABOLISM PLC HYDROLYSES PHOSPHATIDYLINOSITOL 4,5-BIS-PHOSPHATE TO GENERATE 2 SECOND MESSENGERS, INOSITOL 1,4,5-TRISPHOSPHATE AND DIACYLGLYCEROL, THAT GENERATE DIVERSE CELLULAR RESPONSES PLC IS ACTIVATED BY VARIOUS SIGNALLING MOLECULES, INCLUDING CA2+, HETEROMETRIC G PROTEINS, SMALL G PROTEINS, AND RECEPTOR/NON-RECEPTOR TYROSINE KINASES IN ADDITION TO THEIR ENZYMATIC ACTIVITY, SOME PLC SUBTYPES ALSO FUNCTION AS A GUANINE NUCLEOTIDE EXCHANGE FACTOR, GTPASE-ACTIVATING PROTEIN, AND ADAPTOR PROTEIN, INDEPENDENT OF THEIR LIPASE ACTIVITY THERE ARE 13 PLC ISOZYMES IN MAMMALS, AND THEY ARE CATEGORIZED INTO 6 CLASSES BASED ON STRUCTURE GENERATION AND ANALYSIS OF GENETICALLY MODIFIED MICE HAS REVEALED THE UNEXPECTEDLY DIVERSE PHYSIOLOGICAL FUNCTIONS OF PLC ISOZYMES ALTHOUGH ALL PLC ISOZYMES CATALYZE THE SAME REACTION, EACH PLC ISOZYME HAS UNIQUE PHYSIOLOGICAL FUNCTIONS THIS REVIEW FOCUSES ON THE REGULATION AND PHYSIOLOGICAL FUNCTIONS OF PLCS...
January 27, 2017: Journal of Biochemistry
https://www.readbyqxmd.com/read/28124644/differences-in-innate-immune-response-gene-regulation-in-the-middle-ear-of-children-who-are-otitis-prone-and-in-those-not-otitis-prone
#19
Ravinder Kaur, Janet Casey, Michael Pichichero
OBJECTIVE: Acute otitis media (AOM) causes an inflammatory response in the middle ear. We assessed differences in innate immune responses involved in bacterial defense at onset of AOM in children who were stringently defined as otitis prone (sOP) and children not otitis prone (NOP). STUDY DESIGN: Innate immune genes analysis from middle ear fluid (MEF) samples of children. METHODS: Genes of toll-like receptors (TLR), nod-like and retinoic acid-inducible gene-I-like receptors, downstream effectors important for inflammation and apoptosis, including cytokines and chemokines, were studied from MEF samples by using a real-time polymerase chain reaction array...
November 1, 2016: American Journal of Rhinology & Allergy
https://www.readbyqxmd.com/read/28114344/nod1card-might-be-using-multiple-interfaces-for-rip2-mediated-card-card-interaction-insights-from-molecular-dynamics-simulation
#20
Jitendra Maharana, Sukanta Kumar Pradhan, Sachinandan De
The nucleotide-binding and oligomerization domain (NOD)-containing protein 1 (NOD1) plays the pivotal role in host-pathogen interface of innate immunity and triggers immune signalling pathways for the maturation and release of pro-inflammatory cytokines. Upon the recognition of iE-DAP, NOD1 self-oligomerizes in an ATP-dependent fashion and interacts with adaptor molecule receptor-interacting protein 2 (RIP2) for the propagation of innate immune signalling and initiation of pro-inflammatory immune responses...
2017: PloS One
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