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https://www.readbyqxmd.com/read/27902448/rasgrp1-promotes-amphetamine-induced-motor-behavior-through-a-rhes-interaction-network-rhesactome-in-the-striatum
#1
Neelam Shahani, Supriya Swarnkar, Vincenzo Giovinazzo, Jenny Morgenweck, Laura M Bohn, Catherina Scharager-Tapia, Bruce Pascal, Pablo Martinez-Acedo, Kshitij Khare, Srinivasa Subramaniam
The striatum of the brain coordinates motor function. Dopamine-related drugs may be therapeutic to patients with striatal neurodegeneration, such as Huntington's disease (HD) and Parkinson's disease (PD), but these drugs have unwanted side effects. In addition to stimulating the release of norepinephrine, amphetamines, which are used for narcolepsy and attention-deficit/hyperactivity disorder (ADHD), trigger dopamine release in the striatum. The guanosine triphosphatase Ras homolog enriched in the striatum (Rhes) inhibits dopaminergic signaling in the striatum, is implicated in HD and L-dopa-induced dyskinesia, and has a role in striatal motor control...
November 15, 2016: Science Signaling
https://www.readbyqxmd.com/read/27891502/diacylglycerol-kinases-in-t-cell-tolerance-and-effector-function
#2
REVIEW
Shelley S Chen, Zhiming Hu, Xiao-Ping Zhong
Diacylglycerol kinases (DGKs) are a family of enzymes that regulate the relative levels of diacylglycerol (DAG) and phosphatidic acid (PA) in cells by phosphorylating DAG to produce PA. Both DAG and PA are important second messengers cascading T cell receptor (TCR) signal by recruiting multiple effector molecules, such as RasGRP1, PKCθ, and mTOR. Studies have revealed important physiological functions of DGKs in the regulation of receptor signaling and the development and activation of immune cells. In this review, we will focus on recent progresses in our understanding of two DGK isoforms, α and ζ, in CD8 T effector and memory cell differentiation, regulatory T cell development and function, and invariant NKT cell development and effector lineage differentiation...
2016: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/27890930/histone-deacetylase-inhibitors-interrupt-hsp90-rasgrp1-and-hsp90-craf-interactions-to-upregulate-bim-and-circumvent-drug-resistance-in-lymphoma-cells
#3
H Ding, K L Peterson, C Correia, B Koh, P A Schneider, G S Nowakowski, S H Kaufmann
Histone deacetylase (HDAC) inhibitors, which are approved for the treatment of cutaneous T cell lymphoma and multiple myeloma, are undergoing evaluation in other lymphoid neoplasms. How they kill susceptible cells is incompletely understood. Here we show that trichostatin A, romidepsin, and panobinostat induce apoptosis across a panel of malignant B cell lines, including lines that are intrinsically resistant to bortezomib, etoposide, cytarabine, and BH3 mimetics. Further analysis traces the pro-apoptotic effects of HDAC inhibitors to increased acetylation of the chaperone heat shock protein 90 (HSP90), causing release and degradation of the HSP90 client proteins RASGRP1 and CRAF, which in turn leads to downregulation of mitogen activated protein kinase pathway signaling and upregulation of the pro-apoptotic BCL2 family member BIM in vitro and in vivo...
November 28, 2016: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27878761/genome-wide-association-analysis-of-the-sense-of-smell-in-u-s-older-adults-identification-of-novel-risk-loci-in-african-americans-and-european-americans
#4
Jing Dong, Annah Wyss, Jingyun Yang, T Ryan Price, Aude Nicolas, Michael Nalls, Greg Tranah, Nora Franceschini, Zongli Xu, Claudia Schulte, Alvaro Alonso, Steven R Cummings, Myriam Fornage, Dmitri Zaykin, Leping Li, Xuemei Huang, Stephen Kritchevsky, Yongmei Liu, Thomas Gasser, Robert S Wilson, Philip L De Jager, Andrew B Singleton, Jayant M Pinto, Tamara Harris, Thomas H Mosley, David A Bennett, Stephanie London, Lei Yu, Honglei Chen
The human sense of smell decreases with age, and a poor sense of smell are among the most important prodromal symptoms of several neurodegenerative diseases. Recent evidence further suggests a racial difference in the sense of smell among U.S. older adults. However, no genome-wide association study (GWAS) on the sense of smell has been conducted in African-Americans (AAs). We performed the first genome-wide meta-analysis of the sense of smell among 1979 AAs and 6582 European-Americans (EAs) from three U.S. aging cohorts...
November 23, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27804980/novel-identified-associations-of-rgs1-and-rasgrp1-variants-in-iga-nephropathy
#5
Xu-Jie Zhou, Swapan K Nath, Yuan-Yuan Qi, Celi Sun, Ping Hou, Yue-Miao Zhang, Ji-Cheng Lv, Su-Fang Shi, Li-Jun Liu, Ruoyan Chen, Wanling Yang, Kevin Zhi He, Yanming Li, Hong Zhang
Known susceptibility loci together can only explain about 6-8% of the disease heritability of IgA nephropathy (IgAN), suggesting that there are still a large number of genetic variants remained to be discovered. We previously identified IgAN and systemic lupus erythematosus (SLE)/lupus nephritis (LN) shared many loci based on GWAS on Chinese populations. The more recent study with high-density genotyping of immune-related loci in individuals with Asian ancestry identified 10 new and 6 suggestive loci in SLE...
November 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27776107/rasgrp1-deficiency-causes-immunodeficiency-with-impaired-cytoskeletal-dynamics
#6
Elisabeth Salzer, Deniz Cagdas, Miroslav Hons, Emily M Mace, Wojciech Garncarz, Özlem Yüce Petronczki, René Platzer, Laurène Pfajfer, Ivan Bilic, Sol A Ban, Katharina L Willmann, Malini Mukherjee, Verena Supper, Hsiang Ting Hsu, Pinaki P Banerjee, Papiya Sinha, Fabienne McClanahan, Gerhard J Zlabinger, Winfried F Pickl, John G Gribben, Hannes Stockinger, Keiryn L Bennett, Johannes B Huppa, Loïc Dupré, Özden Sanal, Ulrich Jäger, Michael Sixt, Ilhan Tezcan, Jordan S Orange, Kaan Boztug
RASGRP1 is an important guanine nucleotide exchange factor and activator of the RAS-MAPK pathway following T cell antigen receptor (TCR) signaling. The consequences of RASGRP1 mutations in humans are unknown. In a patient with recurrent bacterial and viral infections, born to healthy consanguineous parents, we used homozygosity mapping and exome sequencing to identify a biallelic stop-gain variant in RASGRP1. This variant segregated perfectly with the disease and has not been reported in genetic databases. RASGRP1 deficiency was associated in T cells and B cells with decreased phosphorylation of the extracellular-signal-regulated serine kinase ERK, which was restored following expression of wild-type RASGRP1...
December 2016: Nature Immunology
https://www.readbyqxmd.com/read/27465532/rasgrp1-and-rasgrp3-are-required-for-efficient-generation-of-early-thymic-progenitors
#7
Dominic P Golec, Laura M Henao Caviedes, Troy A Baldwin
T cell development is dependent on the migration of progenitor cells from the bone marrow to the thymus. Upon reaching the thymus, progenitors undergo a complex developmental program that requires inputs from various highly conserved signaling pathways including the Notch and Wnt pathways. To date, Ras signaling has not been implicated in the very earliest stages of T cell differentiation, but members of a family of Ras activators called RasGRPs have been shown to be involved at multiple stages of T cell development...
September 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27344389/association-analysis-for-feet-and-legs-disorders-with-whole-genome-sequence-variants-in-3-dairy-cattle-breeds
#8
Xiaoping Wu, Bernt Guldbrandtsen, Mogens Sandø Lund, Goutam Sahana
Identification of genetic variants associated with feet and legs disorders (FLD) will aid in the genetic improvement of these traits by providing knowledge on genes that influence trait variations. In Denmark, FLD in cattle has been recorded since the 1990s. In this report, we used deregressed breeding values as response variables for a genome-wide association study. Bulls (5,334 Danish Holstein, 4,237 Nordic Red Dairy Cattle, and 1,180 Danish Jersey) with deregressed estimated breeding values were genotyped with the Illumina Bovine 54k single nucleotide polymorphism (SNP) genotyping array...
September 2016: Journal of Dairy Science
https://www.readbyqxmd.com/read/27279372/autoantibody-mediated-pulmonary-alveolar-proteinosis-in-rasgrp1-deficient-mice
#9
Andrew Ferretti, Jarrod R Fortwendel, Sarah A Gebb, Robert A Barrington
Pulmonary alveolar proteinosis (PAP) is a rare lung syndrome caused by the accumulation of surfactants in the alveoli. The most prevalent clinical form of PAP is autoimmune PAP (aPAP) whereby IgG autoantibodies neutralize GM-CSF. GM-CSF is a pleiotropic cytokine that promotes the differentiation, survival, and activation of alveolar macrophages, the cells responsible for surfactant degradation. IgG-mediated neutralization of GM-CSF thereby inhibits alveolar macrophage homeostasis and function, leading to surfactant accumulation and innate immunodeficiency...
July 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27268232/association-of-established-thyroid-peroxidase-autoantibody-tpoab-genetic-variants-with-hashimoto-s-thyroiditis
#10
Luka Brčić, Ana Barić, Sanda Gračan, Dubravka Brdar, Vesela Torlak Lovrić, Nikolina Vidan, Tatijana Zemunik, Ozren Polašek, Maja Barbalić, Ante Punda, Vesna Boraska Perica
Hashimoto's thyroiditis (HT) is the most common form of autoimmune thyroid diseases (AITD) characterized by progressive destruction of thyroid tissue that may lead to hypothyroidism. High thyroid autoantibodies against thyroid peroxidase (TPOAb) levels are present in 90% of patients with HT and serve as a clinical marker for the detection of early AITD/HT. The main aim of our study was to test whether recently identified genetic variants associated with TPOAb are also involved in HT development. A total of 504 unrelated individuals, including 200 patients with HT and 304 controls, were involved in this study...
June 7, 2016: Autoimmunity
https://www.readbyqxmd.com/read/27183569/cd275-independent-il-17-producing-t-follicular-helper-like-cells-in-lymphopenic-autoimmune-prone-mice
#11
Christopher Smith, Janet E Buhlmann, Xiaogan Wang, Amber Bartlett, Bing Lim, Robert A Barrington
T cells undergo homeostatic expansion and acquire an activated phenotype in lymphopenic microenvironments. Restoration of normal lymphocyte numbers typically re-establishes normal homeostasis, and proinflammatory cytokine production returns to baseline. Mice deficient in guanine nucleotide exchange factor RasGRP1 exhibit dysregulated homeostatic expansion, which manifests as lymphoproliferative disease with autoantibody production. Our previous work revealed that autoreactive B cells lacking RasGRP1 break tolerance early during development, as well as during germinal center responses, suggesting that T cell-independent and T cell-dependent mechanisms are responsible...
June 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27159504/distinct-oncogenic-ras-signals-characterized-by-profound-differences-in-flux-through-the-rasgdp-rasgtp-cycle
#12
Marsilius Mues, Jeroen P Roose
T cell acute lymphoblastic leukemia/lymphoma (T-ALL) is an aggressive bone marrow cancer in children and adults, and chemotherapy often fails for relapsing patients. Molecularly targeted therapy is hindered by heterogeneity in T-ALL and mechanistic details of the affected pathways in T-ALL are needed. Deregulation of Ras signals is common in T-ALL. Ras is genetically mutated to a constitutively active form in about 15% of all hematopoietic malignancies, but there is a range of other ways to augment signaling through the Ras pathway...
May 9, 2016: Small GTPases
https://www.readbyqxmd.com/read/27022025/structural-basis-for-the-failure-of-the-c1-domain-of-ras-guanine-nucleotide-releasing-protein-2-rasgrp2-to-bind-phorbol-ester-with-high-affinity
#13
Agnes Czikora, Daniel J Lundberg, Adelle Abramovitz, Nancy E Lewin, Noemi Kedei, Megan L Peach, Xiaoling Zhou, Raymond C Merritt, Elizabeth A Craft, Derek C Braun, Peter M Blumberg
The C1 domain represents the recognition module for diacylglycerol and phorbol esters in protein kinase C, Ras guanine nucleotide releasing protein (RasGRP), and related proteins. RasGRP2 is exceptional in that its C1 domain has very weak binding affinity (Kd = 2890 ± 240 nm for [(3)H]phorbol 12,13-dibutyrate. We have identified four amino acid residues responsible for this lack of sensitivity. Replacing Asn(7), Ser(8), Ala(19), and Ile(21) with the corresponding residues from RasGRP1/3 (Thr(7), Tyr(8), Gly(19), and Leu(21), respectively) conferred potent binding affinity (Kd = 1...
May 20, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/26939566/genetic-variants-associated-with-rheumatoid-arthritis-patients-and-serotypes-in-european-populations
#14
Otsanda Ruiz-Larrañaga, Maria Uribarri, Maria C Alcaro, Sergio Escorza-Treviño, Jokin Del Amo, Mikel Iriondo, Carmen Manzano, Paola Migliorini, Veronika Lóránd, Andone Estonba
OBJECTIVES: To replicate the association of rheumatoid arthritis (RA) susceptibility loci in an independent European sample and to assess their specificity with anti-citrullinated protein antibodies (ACPA) status. METHODS: A selection of 64 SNP previously associated with RA have been typed in a cohort of 267 RA patients (169 ACPA-positive and 98 ACPA-negative) and 152 controls from the Rheumatology Units of the University Hospital of Pisa (Italy) and the University of Pécs Medical Center (Hungary)...
March 2016: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/26851222/rasgrp1-is-an-essential-signaling-molecule-for-development-of-b1a-cells-with-autoantigen-receptors
#15
Benchang Guo, Thomas L Rothstein
B1a cells, particularly the PD-L2(+) B1a cell subset, are enriched with autoantigen-specific receptors. However, the underlying molecular mechanism responsible for the skewed selection of autoreactive B1a cells remains unclear. In this study, we find that B1 cells express only Ras guanyl nucleotide-releasing protein (RasGRP) 1, whereas B2 cells express mostly RasGRP3 and little RasGRP1. RasGRP1 is indispensable for transduction of weak signals. RasGRP1 deficiency markedly impairs B1a cell development and reduces serum natural IgM production; in particular, B1a cells that express autoantigen receptors, such as anti-phosphatidylcholine B1a cells, are virtually eliminated...
March 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/26808113/high-density-genotyping-of-immune-related-loci-identifies-new-sle-risk-variants-in-individuals-with-asian-ancestry
#16
Celi Sun, Julio E Molineros, Loren L Looger, Xu-Jie Zhou, Kwangwoo Kim, Yukinori Okada, Jianyang Ma, Yuan-Yuan Qi, Xana Kim-Howard, Prasenjeet Motghare, Krishna Bhattarai, Adam Adler, So-Young Bang, Hye-Soon Lee, Tae-Hwan Kim, Young Mo Kang, Chang-Hee Suh, Won Tae Chung, Yong-Beom Park, Jung-Yoon Choe, Seung Cheol Shim, Yuta Kochi, Akari Suzuki, Michiaki Kubo, Takayuki Sumida, Kazuhiko Yamamoto, Shin-Seok Lee, Young Jin Kim, Bok-Ghee Han, Mikhail Dozmorov, Kenneth M Kaufman, Jonathan D Wren, John B Harley, Nan Shen, Kek Heng Chua, Hong Zhang, Sang-Cheol Bae, Swapan K Nath
Systemic lupus erythematosus (SLE) has a strong but incompletely understood genetic architecture. We conducted an association study with replication in 4,478 SLE cases and 12,656 controls from six East Asian cohorts to identify new SLE susceptibility loci and better localize known loci. We identified ten new loci and confirmed 20 known loci with genome-wide significance. Among the new loci, the most significant locus was GTF2IRD1-GTF2I at 7q11.23 (rs73366469, Pmeta = 3.75 × 10(-117), odds ratio (OR) = 2.38), followed by DEF6, IL12B, TCF7, TERT, CD226, PCNXL3, RASGRP1, SYNGR1 and SIGLEC6...
March 2016: Nature Genetics
https://www.readbyqxmd.com/read/26707063/renal-microrna-and-rna-profiles-in-progressive-chronic-kidney-disease
#17
Michael Rudnicki, Paul Perco, Barbara D Haene, Johannes Leierer, Andreas Heinzel, Irmgard Mühlberger, Ninella Schweibert, Judith Sunzenauer, Heinz Regele, Andreas Kronbichler, Pieter Mestdagh, Jo Vandesompele, Bernd Mayer, Gert Mayer
BACKGROUND: MicroRNAs (miRNAs) contribute to chronic kidney disease (CKD) progression via regulating mRNAs involved in renal homeostasis. However, their association with clinical outcome remains poorly understood. MATERIALS AND METHODS: We performed miRNA and mRNA expression profiling on renal biopsy sections by qPCR (miRNA) and microarrays (mRNA) in a discovery (n = 43) and in a validation (n = 29) cohort. miRNAs differentiating stable and progressive cases were inversely correlated with putative target mRNAs, which were further characterized by pathway analysis using KEGG pathways...
March 2016: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/26608788/pth-modulation-of-ncc-activity-regulates-trpv5-ca2-reabsorption
#18
Robert S Hoover, Viktor Tomilin, Lauren Hanson, Oleh Pochynyuk, Benjamin Ko
Since parathyroid hormone (PTH) is known to increase transient receptor potential vanilloid (TRPV)5 activity and decrease Na(+)-Cl(-) cotransporter (NCC) activity, we hypothesized that decreased NCC-mediated Na(+) reabsorption contributes to the enhanced TRPV5 Ca(2+) reabsorption seen with PTH. To test this, we used mDCT15 cells expressing functional TRPV5 and ruthenium red-sensitive (45)Ca(2+) uptake. PTH increased (45)Ca(2+) uptake to 8.8 ± 0.7 nmol·mg(-1)·min(-1) (n = 4, P < 0.01) and decreased NCC activity from 75...
January 15, 2016: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/26549032/rasgrp1-overexpression-in-t-all-increases-basal-nucleotide-exchange-on-ras-rendering-the-ras-pi3k-akt-pathway-responsive-to-protumorigenic-cytokines
#19
O Ksionda, A A Melton, J Bache, M Tenhagen, J Bakker, R Harvey, S S Winter, I Rubio, J P Roose
Ras GTPases are activated by RasGEFs and inactivated by RasGAPs, which stimulate the hydrolysis of RasGTP to inactive RasGDP. GTPase-impairing somatic mutations in RAS genes, such as KRAS(G12D), are among the most common oncogenic events in metastatic cancer. A different type of cancer Ras signal, driven by overexpression of the RasGEF RasGRP1 (Ras guanine nucleotide-releasing protein 1), was recently implicated in pediatric T-cell acute lymphoblastic leukemia (T-ALL) patients and murine models, in which RasGRP1 T-ALLs expand in response to treatment with interleukins (ILs) 2, 7 and 9...
July 14, 2016: Oncogene
https://www.readbyqxmd.com/read/26076219/common-rasgrp1-gene-variants-that-confer-risk-of-type-2-diabetes
#20
Jun-Yan Li, Feng Tao, Xin-Xing Wu, Ying-Zi Tan, Lin He, Hao Lu
BACKGROUND: Genome-wide association studies have validated the RAS guanyl nucleotide-releasing protein 1 (RASGRP1) gene as a type 2 diabetes (T2D) susceptibility locus. AIMS: This study aimed to replicate and verify the association of RASGRP1 tag single-nucleotide polymorphisms with T2D in a Chinese Han population. METHODS: Eleven common variants of RASGRP1 were detected using TaqMan technology in 1272 healthy controls and 1234 T2D patients...
August 2015: Genetic Testing and Molecular Biomarkers
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