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https://www.readbyqxmd.com/read/27933650/up-regulation-of-microrna-133a-inhibits-the-mek-erk-signaling-pathway-to-promote-cell-apoptosis-and-enhance-radio-sensitivity-by-targeting-egfr-in-esophageal-cancer-in-vivo-and-in-vitro
#1
Qing-Shan Yang, Li-Peng Jiang, Chun-Yan He, Yu-Na Tong, Yuan-Yuan Liu
This study aims to explore how microRNA-133a (miR-133a) affects cell apoptosis and radio-sensitivity by targeting EGFR via regulating MEK/ERK pathway in esophageal cancer (EC). A total of 358 EC patients were selected and assigned into the resistant and sensitive groups. Human EC KYSE 150 cell line was assigned into the blank, negative control (NC), miR-133a mimic, miR-133a inhibitors, si-EGFR, miR-133a inhibitors + si-EGFR groups after transfection. MiR-133a and EGFR mRNA expressions were detected by qRT-PCR and EGFR, MEK/ERK pathway-related protein expressions were detected by Western blotting...
December 8, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27933067/peptide-idr-1002-inhibits-nf-%C3%AE%C2%BAb-nuclear-translocation-by-inhibition-of-i%C3%AE%C2%BAb%C3%AE-degradation-and-activates-p38-erk1-2-msk1-dependent-creb-phosphorylation-in-macrophages-stimulated-with-lipopolysaccharide
#2
Alejandro Huante-Mendoza, Octavio Silva-García, Javier Oviedo-Boyso, Robert E W Hancock, Víctor M Baizabal-Aguirre
The inflammatory response is a critical molecular defense mechanism of the innate immune system that mediates the elimination of disease-causing bacteria. Repair of the damaged tissue, and the reestablishment of homeostasis, must be accomplished after elimination of the pathogen. The innate defense regulators (IDRs) are short cationic peptides that mimic natural host defense peptides and are effective in eliminating pathogens by enhancing the activity of the immune system while controlling the inflammatory response...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27932310/loss-of-dopamine-d1-receptors-and-diminished-d1-5-receptor-mediated-erk-phosphorylation-in-the-periaqueductal-gray-after-spinal-cord-lesion
#3
Pamela J Voulalas, Yadong Ji, Li Jiang, Jamila Asgar, Jin Y Ro, Radi Masri
Neuropathic pain resulting from spinal cord injury is often accompanied by maladaptive plasticity of the central nervous system, including the opioid receptor-rich periaqueductal gray (PAG). Evidence suggests that sensory signaling via the PAG is robustly modulated by dopamine D1- and D2-like receptors, but the effect of damage to the spinal cord on D1 and D2 receptor protein expression and function in the PAG has not been examined. Here we show that 21 days after a T10 or C6 spinothalamic tract lesion, both mice and rats display a remarkable decline in the expression of D1 receptors in the PAG, revealed by western blot analysis...
December 5, 2016: Neuroscience
https://www.readbyqxmd.com/read/27930970/astragaloside-iv-inhibits-breast-cancer-cell-invasion-by-suppressing-vav3-mediated-rac1-mapk-signaling
#4
Ke Jiang, Qing Lu, Qiong Li, Yajie Ji, Weili Chen, Xiaohong Xue
BACKGROUND: Astragaloside IV (AS-IV), the major active triterpenoid in Radix Astragali, has shown anti-tumorigenic properties in certain cancers; however, its role in breast cancer remains unclear. The present study investigated the effects of AS-IV on breast cancer in vitro and in vivo and examined the underlying mechanisms. METHODS: The effects of AS-IV on MDA-MB-231 cell proliferation, migration, invasion and metastasis were investigated by MTT and Transwell assays, and western blotting...
December 5, 2016: International Immunopharmacology
https://www.readbyqxmd.com/read/27930802/ap39-a-mitochondria-targeting-hydrogen-sulfide-h2-s-donor-protects-against-myocardial-reperfusion-injury-independently-of-salvage-kinase-signalling
#5
Qutuba G Karwi, Julia Bornbaum, Kerstin Boengler, Roberta Torregrossa, Matthew Whiteman, Mark E Wood, Rainer Schulz, Gary F Baxter
BACKGROUND AND PURPOSE: H2 S protects myocardium against ischaemia-reperfusion injury. This protection may involve the cytosolic reperfusion injury salvage kinase (RISK) pathway, but direct effects on mitochondrial function are possible. Here, we investigated the potential cardioprotective effect of mitochondria-specific H2 S donor, AP39, at reperfusion against ischaemia/reperfusion injury. EXPERIMENTAL APPROACH: Anaesthetised rats underwent myocardial (30 min ischaemia/120 min reperfusion) with randomisation to receive interventions prior to reperfusion: vehicle, AP39 (0...
December 8, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27930693/endothelin-b-receptors-on-primary-chicken-m%C3%A3-ller-cells-and-the-human-mio-m1-m%C3%A3-ller-cell-line-activate-erk-signaling-via-transactivation-of-epidermal-growth-factor-receptors
#6
Mohammad Harun-Or-Rashid, Dardan Konjusha, Caridad Galindo-Romero, Finn Hallböök
Injury to the eye or retina triggers Müller cells, the major glia cell of the retina, to dedifferentiate and proliferate. In some species they attain retinal progenitor properties and have the capacity to generate new neurons. The epidermal growth factor receptor (EGFR) system and extracellular signal-regulated kinase (ERK) signaling are key regulators of these processes in Müller cells. The extracellular signals that modulate and control these processes are not fully understood. In this work we studied whether endothelin receptor signaling can activate EGFR and ERK signaling in Müller cells...
2016: PloS One
https://www.readbyqxmd.com/read/27929393/xylobiose-an-alternative-sweetener-ameliorates-diabetes-related-metabolic-changes-by-regulating-hepatic-lipogenesis-and-mir-122a-33a-in-db-db-mice
#7
Eunjin Lim, Ji Ye Lim, Eunju Kim, Yoo-Sun Kim, Jae-Ho Shin, Pu Reum Seok, Sangwon Jung, Sang-Ho Yoo, Yuri Kim
Type 2 diabetes is a major public health concern worldwide. Xylobiose (XB) consists of two molecules of d-xylose and is a major disaccharide in xylooligosaccharides that are used as prebiotics. We hypothesized that XB could regulate diabetes-related metabolic and genetic changes via microRNA expression in db/db mice. For six weeks, C57BL/KsJ-db/db mice received 5% XB as part of the total sucrose content of their diet. XB supplementation improved glucose tolerance with reduced levels of OGTT AUC, fasting blood glucose, HbA1c, insulin, and HOMA-IR...
December 5, 2016: Nutrients
https://www.readbyqxmd.com/read/27927913/two-janus-cannabinoids-that-are-both-cb2-agonists-and-cb1-antagonists
#8
Amey Dhopeshwarkar, Natalia Murataeva, Alex Makriyannis, Alex Straiker, Ken P Mackie
The cannabinoid signaling system includes two G protein coupled receptors, CB1 and CB2. These receptors are widely distributed throughout the body and have each been implicated in many physiologically important processes. Though the cannabinoid signaling system has therapeutic potential, a persistent hurdle has remained the development of receptor-selective ligands. Because CB1 and CB2 are involved in diverse processes, it would be advantageous develop ligands that differentially engaging CB1 and CB2. We now report that GW405833 and AM1710, described as selective CB2 agonists, can antagonize CB1 receptor signaling...
December 7, 2016: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/27927769/integration-of-b-cell-receptor-induced-erk1-2-phosphorylation-and-mutations-of-sf3b1-gene-refines-prognosis-in-treatment-naive-chronic-lymphocytic-leukemia
#9
Chiara Cavallini, Carlo Visco, Santosh Putta, Davide Rossi, Elda Mimiola, Norman Purvis, Ornella Lovato, Omar Perbellini, Erika Falisi, Monica Facco, Livio Trentin, Maria G Romanelli, Gianpietro Semenzato, Achille Ambrosetti, Gianluca Gaidano, Giovanni Pizzolo, Alessandra Cesano, Maria T Scupoli
No abstract text is available yet for this article.
December 7, 2016: Haematologica
https://www.readbyqxmd.com/read/27927723/coordinated-activation-of-mitochondrial-respiration-and-exocytosis-mediated-by-pkc-signaling-in-pancreatic-%C3%AE-cells
#10
Jaime Santo-Domingo, Isabelle Chareyron, Loïc Dayon, Antonio Núñez Galindo, Ornella Cominetti, María Pilar Giner Giménez, Umberto De Marchi, Carles Canto, Martin Kussmann, Andreas Wiederkehr
Mitochondria play a central role in pancreatic β-cell nutrient sensing by coupling their metabolism to plasma membrane excitability and insulin granule exocytosis. Whether non-nutrient secretagogues stimulate mitochondria as part of the molecular mechanism to promote insulin secretion is not known. Here, we show that PKC signaling, which is employed by many non-nutrient secretagogues, augments mitochondrial respiration in INS-1E (rat insulinoma cell line clone 1E) and human pancreatic β-cells. The phorbol ester, phorbol 12-myristate 13-acetate, accelerates mitochondrial respiration at both resting and stimulatory glucose concentrations...
December 7, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27927626/the-impact-of-tgf-%C3%AE-inhibition-during-acute-exercise-on-achilles-tendon-extracellular-matrix
#11
Ross M Potter, Richard T Huynh, Brent D Volper, Kathryn A Arthur, Andrew C D'Lugos, Mikkel A Sørensen, S Peter Magnusson, Jared M Dickinson, Taben M Hale, Chad C Carroll
The purpose of this study was to evaluate the role of TGF-β1 in regulating tendon extracellular matrix (ECM) after acute exercise. Wistar rats exercised (n=15) on a treadmill for four consecutive days (60 min/day) or maintained normal cage activity. After each exercise bout, the peritendinous space of each Achilles tendon was injected with a TGF-β1 receptor inhibitor or sham. Independent of group, tendons injected with inhibitor exhibited ~50% lower Smad 3 (Ser423/425) (p<0.05) and 2.5-fold greater ERK1/2 phosphorylation (p<0...
December 7, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27926479/decline-in-arylsulfatase-b-leads-to-increased-invasiveness-of-melanoma-cells
#12
Sumit Bhattacharyya, Leo Feferman, Kaoru Terai, Arkadiusz Z Dudek, Joanne K Tobacman
Arylsulfatase B (ARSB; N-acetylgalactosamine 4-sulfatase) is reduced in several malignancies, but levels in melanoma have not been investigated previously. Experiments were performed in melanoma cell lines to determine ARSB activity and impact on melanoma invasiveness. ARSB activity was reduced ~50% in melanoma cells compared to normal melanocytes. Silencing ARSB significantly increased the mRNA expression of chondroitin sulfate proteoglycan(CSPG)4 and pro-matrix metalloproteinase(MMP)-2, known mediators of melanoma progression...
December 1, 2016: Oncotarget
https://www.readbyqxmd.com/read/27925186/up-regulation-of-transient-receptor-potential-melastatin-6-channel-expression-by-tumor-necrosis-factor-%C3%AE-in-the-presence-of-epidermal-growth-factor-receptor-tyrosine-kinase-inhibitor
#13
Chisa Furukawa, Naoko Fujii, Aya Manabe, Toshiyuki Matsunaga, Satoshi Endo, Hajime Hasegawa, Yoshinori Ito, Masahiko Yamaguchi, Yasuhiro Yamazaki, Akira Ikari
Anti-epidermal growth factor receptor (EGFR) drugs such as erlotinib and gefitinib cause a side effect of hypomagnesemia, but chemotherapy to treat this has not yet been developed. The transient receptor potential melastatin 6 (TRPM6) channel is involved in the reabsorption of Mg(2+) in the renal tubule. We reported previously that the expression of TRPM6 is up-regulated by epidermal growth factor (EGF) in renal tubular epithelial NRK-52E and HEK293 cells. EGF-induced elevation of TRPM6 expression was inhibited by erlotinib, gefitinib, and lapatinib...
December 7, 2016: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/27924795/alisol-a-24-acetate-a-triterpenoid-derived-from-alisma-orientale-inhibits-ox-ldl-induced-phenotypic-transformation-and-migration-of-rat-vascular-smooth-muscle-cells-through-suppressing-erk1-2-signaling
#14
Xie-Hua Xue, Xiao-Mao Zhou, Wei Wei, Tong Chen, Qing-Ping Su, Jing Tao, Li-Dian Chen
Alisol A 24-acetate, a triterpenoid extracted from Alisma orientale, has shown antiatherosclerotic actions. The purpose of this study was to evaluate the inhibition of alisol A 24-acetate on oxidized low-density lipoprotein (Ox-LDL)-induced phenotypic transformation and migration of rat vascular smooth muscle cells (VSMCs), and to explore the underlying mechanisms. VSMCs were pretreated with alisol A 24-acetate and a specific extracellular signal-regulated kinase (ERK) inhibitor, U0126, and then stimulated with 50 mg/l Ox-LDL in vitro...
December 8, 2016: Journal of Vascular Research
https://www.readbyqxmd.com/read/27924572/isolation-of-mouse-embryonic-stem-cell-lines-in-the-study-of-erk1-2-map-kinase-signaling
#15
Marc K Saba-El-Leil, Christophe Frémin, Sylvain Meloche
Mouse embryonic stem (ES) cells have proven to be invaluable research tools for dissecting the role of signaling pathways in embryonic development, adult physiology, and various diseases. ES cells are amenable to genetic manipulation by classical gene targeting via homologous recombination or by genome editing technologies. These cells can be used to generate genetically modified mouse models or to study the signaling circuitry regulating self-renewal and early lineage commitment. In this chapter, we describe methods used for the isolation and establishment of mouse ES cell lines from blastocyst embryos and for the measurement of ERK1/2 activity in ES cells...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924568/visualization-of-ras-mapk-signaling-in-situ-by-the-proximity-ligation-assay-pla
#16
Zijian Tang, Chengkai Dai
RAS/MAPK signaling responds to diverse extracellular cues and regulates a wide array of cellular processes. Given its biological importance, abnormalities in RAS/MAPK signaling cascade have been intimately implicated in numerous human diseases, including cancer. Herein, we describe a novel methodology to study activation of this pivotal signaling pathway. The Proximity Ligation Assay (PLA) is employed to monitor kinase-substrate interactions between MEK1 and HSF1, or MEK1 and ERK1 in situ.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924567/the-nuclear-translocation-of-erk
#17
Denise A Berti, Rony Seger
The ERK1 and ERK2 (ERK1/2) cascade is a central signaling pathway activated by a wide variety of extracellular agents that transmit the messages of G Protein Coupled Receptors (GPCRs) and Receptor Tyrosine Kinases (RTKs). Being such a central pathway, the activity of the cascade is well regulated, including by dynamic changes of the subcellular localization of components of the ERK1/2 cascade. In resting cells, ERK1/2 are localized in the cytosol due to their interactions with different anchoring proteins. After stimulation, ERK1/2 are phosphorylated by MEK1/2 on their regulatory TEY motif, which permits their detachment from the anchoring proteins...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924565/analysis-of-ras-erk-compartmentalization-by-subcellular-fractionation
#18
Lorena Agudo-Ibañez, Piero Crespo, Berta Casar
A vast number of stimuli use the Ras/Raf/MEK/ERK signaling cascade to transmit signals from their cognate receptors, in order to regulate multiple cellular functions, including key processes such as proliferation, cell cycle progression, differentiation, and survival. The duration, intensity and specificity of the responses are, in part, controlled by the compartmentalization/subcellular localization of the signaling intermediaries. Ras proteins are found in different plasma membrane microdomains and endomembranes...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924560/assaying-activation-and-subcellular-localization-of-erk-in-cells-and-tissues
#19
Carme Caelles, Carles Bayod, Melisa Morcillo
The extracellular signal-regulated protein kinases 1 and 2 (ERK1/2) are the focus of many studies due to their involvement in numerous physiological and pathological processes, such as cell proliferation and differentiation, and oncogenic transformation, respectively. ERK1/2 belong to the mitogen-activated protein kinase (MAPKs) family, which are serine/threonine kinases that participate in signal transduction and are activated by dual phosphorylation in the Thr-X-Tyr motif located in their activation loop...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27924558/structural-studies-of-erk2-protein-complexes
#20
Johannes F Weijman, Stefan J Riedl, Peter D Mace
ERK1 and ERK2 (ERK1/2) are the primary effector kinases of the RAS-RAF-MEK-ERK signaling pathway. A variety of substrates and regulatory partners associate with ERK1/2 through distinct D-peptide- and DEF-docking sites on their kinase domains. While understanding of D-peptides that bind to ERK1/2 has become increasingly clear over the last decade, only more recently have structures of proteins interacting with other binding sites on ERK1/2 become available. PEA-15 is a 130-residue ERK1/2 regulator that engages both the D-peptide- and DEF-docking sites of ERK kinases, and directly sequesters the ERK2 activation loop in various different phosphorylation states...
2017: Methods in Molecular Biology
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