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Calcium Sensor Receptor

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https://www.readbyqxmd.com/read/29342202/cells-containing-aragonite-crystals-mediate-responses-to-gravity-in-trichoplax-adhaerens-placozoa-an-animal-lacking-neurons-and-synapses
#1
Tatiana D Mayorova, Carolyn L Smith, Katherine Hammar, Christine A Winters, Natalia B Pivovarova, Maria A Aronova, Richard D Leapman, Thomas S Reese
Trichoplax adhaerens has only six cell types. The function as well as the structure of crystal cells, the least numerous cell type, presented an enigma. Crystal cells are arrayed around the perimeter of the animal and each contains a birefringent crystal. Crystal cells resemble lithocytes in other animals so we looked for evidence they are gravity sensors. Confocal microscopy showed that their cup-shaped nuclei are oriented toward the edge of the animal, and that the crystal shifts downward under the influence of gravity...
2018: PloS One
https://www.readbyqxmd.com/read/29305649/sensing-the-heat-with-trpm3
#2
REVIEW
Joris Vriens, Thomas Voets
Heat sensation, the ability to detect warm and noxious temperatures, is an ancient and indispensable sensory process. Noxious temperatures can have detrimental effects on the physiology and integrity of cells, and therefore, the detection of environmental hot temperatures is absolutely crucial for survival. Temperature-sensitive ion channels, which conduct ions in a highly temperature-dependent manner, have been put forward as molecular thermometers expressed at the endings of sensory neurons. In particular, several temperature-sensitive members of the transient receptor potential (TRP) superfamily of ion channels have been identified, and a multitude of in vivo studies have shown that the capsaicin-sensitive TRPV1 channel plays a key role as a noxious heat sensor...
January 5, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29227474/a-proteolytic-fragment-of-histone-deacetylase-4-protects-the-heart-from-failure-by-regulating-the-hexosamine-biosynthetic-pathway
#3
Lorenz H Lehmann, Zegeye H Jebessa, Michael M Kreusser, Axel Horsch, Tao He, Mariya Kronlage, Matthias Dewenter, Viviana Sramek, Ulrike Oehl, Jutta Krebs-Haupenthal, Albert H von der Lieth, Andrea Schmidt, Qiang Sun, Julia Ritterhoff, Daniel Finke, Mirko Völkers, Andreas Jungmann, Sven W Sauer, Christian Thiel, Alexander Nickel, Michael Kohlhaas, Michaela Schäfer, Carsten Sticht, Christoph Maack, Norbert Gretz, Michael Wagner, Ali El-Armouche, Lars S Maier, Juan E Camacho Londoño, Benjamin Meder, Marc Freichel, Hermann-Josef Gröne, Patrick Most, Oliver J Müller, Stephan Herzig, Eileen E M Furlong, Hugo A Katus, Johannes Backs
The stress-responsive epigenetic repressor histone deacetylase 4 (HDAC4) regulates cardiac gene expression. Here we show that the levels of an N-terminal proteolytically derived fragment of HDAC4, termed HDAC4-NT, are lower in failing mouse hearts than in healthy control hearts. Virus-mediated transfer of the portion of the Hdac4 gene encoding HDAC4-NT into the mouse myocardium protected the heart from remodeling and failure; this was associated with decreased expression of Nr4a1, which encodes a nuclear orphan receptor, and decreased NR4A1-dependent activation of the hexosamine biosynthetic pathway (HBP)...
December 11, 2017: Nature Medicine
https://www.readbyqxmd.com/read/29193480/rhabdomyolysis-and-fluctuating-asymptomatic-hyperckemia-associated-with-cacna1s-variant
#4
C Anandan, M A Cipriani, R S Laughlin, Z Niu, M Milone
BACKGROUND AND PURPOSE: CACNA1S encodes Cav 1.1, a voltage sensor for muscle excitation-contraction coupling, which activates the ryanodine receptor 1 (RYR1) leading to calcium release from the sarcoplasmic reticulum. CACNA1S mutations cause hypokalemic periodic paralysis, malignant hyperthermia and congenital myopathy. RYR1 mutations result in congenital myopathy, malignant hyperthermia and rhabdomyolysis. METHODS: The aim was to describe a novel phenotype associated with a CACNA1S variant at a site previously linked to hypokalemic periodic paralysis...
November 29, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29185755/vdac1-and-serca3-mediates-progesterone-triggerd-ca2-signaling-in-breast-cancer-cells
#5
Juberiya M Azeez, Vini Ravindran, Viji Remadevi, Arun Surendran, Abdul Jaleel, T R Santhosh Kumar, Sreeja Sreeharshan
Progesterone is a biphasic hormone whose response in breast cancer cells, consisting of an initial proliferative burst, followed by sustained growth arrest. Recently we reported that progesterone induces a time and concentration dependent release of reactive oxygen species and thus regulates the anti-proliferative activity in breast cancer cell line. Furthermore binding of progesterone on progesterone receptor B may regulate the expression of cell cycle control protein p27 and leads to anti proliferative signaling via multiple signaling pathways including p53, PTEN and antioxidant systems...
November 29, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29184563/the-kinase-erulus-controls-pollen-tube-targeting-and-growth-in-arabidopsis-thaliana
#6
Sébastjen Schoenaers, Daria Balcerowicz, Alex Costa, Kris Vissenberg
In this paper, we describe the role of the receptor-like kinase ERULUS (ERU) in PT growth of Arabidopsis thaliana. In silico analysis and transcriptional reporter lines revealed that ERU is only expressed in pollen and root hairs (RHs), making it a tip growth-specific kinase. Deviations from Mendelian inheritance were observed in the offspring of self-pollinated heterozygous eru plants. We found that in vivo eru PT targeting was disturbed, providing a possible explanation for the observed decrease in eru fertilization competitiveness...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29150934/the-current-status-and-perspectives-regarding-the-clinical-implication-of-intracellular-calcium-in-breast-cancer
#7
REVIEW
Amir Tajbakhsh, Alireza Pasdar, Mehdi Rezaee, Mostafa Fazeli, Saman Soleimanpour, Seyed Mahdi Hassanian, Zahra FarshchiyanYazdi, Tayebe Younesi Rad, Gordon A Ferns, Amir Avan
Calcium ions (Ca2+ ) act as second messengers in intracellular signaling. Ca2+ pumps, channels, sensors, and calcium binding proteins, regulate the concentrations of intracellular Ca2+ as a key regulator of important cellular processes such as gene expression, proliferation, differentiation, DNA repair, apoptosis, metastasis, and hormone secretion. Intracellular Ca2+ also influences the functions of several organelles, that include: the endoplasmic reticulum, mitochondria, the Golgi, and cell membrane both in normal and breast cancer cells...
November 18, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29131377/new-insights-of-subfertility-among-transplanted-women-immunosuppressive-drug-fk506-leads-to-calcium-leak-and-oocyte-activation-before-fertilization
#8
Linlin Liu, Man Yang, Naiqiang Wang, Li Li, Zi-Jiang Chen, Cong Zhang
FKBP12, known as FK506 binding protein, binds to immunosuppressive drug FK506, which must be taken by patients who received organ transplant. The side effect of FK506 is that women have difficulties in bearing a baby, so it is important to find the reason of their subfertility. This research explored the expression of FKBP12 in pre-implantation embryos and investigated its potential effect on reproduction. The results demonstrate that FKBP12 had good co-localization with endoplasmic reticulum and inositol-1, 4, 5- trisphosphate receptor in pre-implantation stages...
November 13, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29107982/competitive-tuning-competition-s-role-in-setting-the-frequency-dependence-of-ca2-dependent-proteins
#9
Daniel R Romano, Matthew C Pharris, Neal M Patel, Tamara L Kinzer-Ursem
A number of neurological disorders arise from perturbations in biochemical signaling and protein complex formation within neurons. Normally, proteins form networks that when activated produce persistent changes in a synapse's molecular composition. In hippocampal neurons, calcium ion (Ca2+) flux through N-methyl-D-aspartate (NMDA) receptors activates Ca2+/calmodulin signal transduction networks that either increase or decrease the strength of the neuronal synapse, phenomena known as long-term potentiation (LTP) or long-term depression (LTD), respectively...
November 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29025860/negative-regulation-of-trpa1-by-amp-activated-protein-kinase-in-primary-sensory-neurons-as-a-potential-mechanism-of-painful-diabetic-neuropathy
#10
Shenglan Wang, Kimiko Kobayashi, Yoko Kogure, Hiroki Yamanaka, Satoshi Yamamoto, Hideshi Yagi, Koichi Noguchi, Yi Dai
AMP activated protein kinase (AMPK) is a widely expressed intracellular energy sensor that monitors and modulates energy expenditure. Transient receptor potential ankyrin 1 (TRPA1) channel is a widely recognized chemical and thermal sensor that plays vital roles in pain transduction. Here, we discovered a functional link between AMPK and TRPA1 in dorsal root ganglion (DRG) neurons, in which AMPK activation rapidly resulted in downregulation of membrane-associated TRPA1 and its channel activity within minutes...
October 12, 2017: Diabetes
https://www.readbyqxmd.com/read/29019979/cryo-electron-microscopy-structure-of-the-lysosomal-calcium-permeable-channel-trpml3
#11
Marscha Hirschi, Mark A Herzik, Jinhong Wie, Yang Suo, William F Borschel, Dejian Ren, Gabriel C Lander, Seok-Yong Lee
The modulation of ion channel activity by lipids is increasingly recognized as a fundamental component of cellular signalling. The transient receptor potential mucolipin (TRPML) channel family belongs to the TRP superfamily and is composed of three members: TRPML1-TRPML3. TRPMLs are the major Ca(2+)-permeable channels on late endosomes and lysosomes (LEL). They regulate the release of Ca(2+) from organelles, which is important for various physiological processes, including organelle trafficking and fusion. Loss-of-function mutations in the MCOLN1 gene, which encodes TRPML1, cause the neurodegenerative lysosomal storage disorder mucolipidosis type IV, and a gain-of-function mutation (Ala419Pro) in TRPML3 gives rise to the varitint-waddler (Va) mouse phenotype...
October 19, 2017: Nature
https://www.readbyqxmd.com/read/28986235/alpha-synuclein-epigenetics-mitochondria-metabolism-calcium-traffic-circadian-dysfunction-in-parkinson-s-disease-an-integrated-strategy-for-management
#12
REVIEW
Oliver T Phillipson
The motor deficits which characterise the sporadic form of Parkinson's disease arise from age-related loss of a subset of dopamine neurons in the substantia nigra. Although motor symptoms respond to dopamine replacement therapies, the underlying disease process remains. This review details some features of the progressive molecular pathology and proposes deployment of a combination of nutrients: R-lipoic acid, acetyl-l-carnitine, ubiquinol, melatonin (or receptor agonists) and vitamin D3, with the collective potential to slow progression of these features...
November 2017: Ageing Research Reviews
https://www.readbyqxmd.com/read/28900914/stim-trp-pathways-and-microdomain-organization-contribution-of-trpc1-in-store-operated-ca-2-entry-impact-on-ca-2-signaling-and-cell-function
#13
Hwei Ling Ong, Indu S Ambudkar
Store-operated calcium entry (SOCE) is a ubiquitous Ca(2+) entry pathway that is activated in response to depletion of ER-Ca(2+) stores and critically controls the regulation of physiological functions in a wide variety of cell types. The transient receptor potential canonical (TRPC) channels (TRPCs 1-7), which are activated by stimuli leading to PIP2 hydrolysis, were first identified as molecular components of SOCE channels. While TRPC1 was associated with SOCE and regulation of function in several cell types, none of the TRPC members displayed I CRAC, the store-operated current identified in lymphocytes and mast cells...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28886908/dna-sensing-across-the-tree-of-life
#14
REVIEW
Stefania Gallucci, Massimo E Maffei
From plants to mammals, pattern recognition receptors (PRRs) specifically recognize DNA, as a potential marker of either infection or damage. These receptors play critical roles in inflammation, immunity, and pathogen resistance. Importantly, given the ubiquity of DNA, its sensing must be tightly regulated. DNA localization plays a key role in recognition, as highlighted by Toll-like receptor 9 (TLR9) in the endosomal compartment and cyclic GMP-AMP synthase (cGAS) and absent in melanoma 2 (AIM2) in the cytoplasm...
October 2017: Trends in Immunology
https://www.readbyqxmd.com/read/28797116/calcium-imaging-with-genetically-encoded-sensor-case12-facile-analysis-of-%C3%AE-7-%C3%AE-9-nachr-mutants
#15
Irina Shelukhina, Ekaterina Spirova, Denis Kudryavtsev, Lucy Ojomoko, Markus Werner, Christoph Methfessel, Michael Hollmann, Victor Tsetlin
Elucidation of the structural basis of pharmacological differences for highly homologous α7 and α9 nicotinic acetylcholine receptors (nAChRs) may shed light on their involvement in different physiological functions and diseases. Combination of site-directed mutagenesis and electrophysiology is a powerful tool to pinpoint the key amino-acid residues in the receptor ligand-binding site, but for α7 and α9 nAChRs it is complicated by their poor expression and fast desensitization. Here, we probed the ligand-binding properties of α7/α9 nAChR mutants by a proposed simple and fast calcium imaging method...
2017: PloS One
https://www.readbyqxmd.com/read/28686803/the-calcium-sensor-synaptotagmin-1-is-expressed-and-regulated-in-hippocampal-postsynaptic-spines
#16
Suleman Hussain, Daniel Lawer Egbenya, Yi-Chen Lai, Zita J Dosa, Jakob B Sørensen, Anne E Anderson, Svend Davanger
Synaptotagmin 1 is a presynaptic calcium sensor, regulating SNARE-mediated vesicle exocytosis of transmitter. Increasing evidence indicate roles of SNARE proteins in postsynaptic glutamate receptor trafficking. However, a possible postsynaptic expression of synaptotagmin 1 has not been demonstrated previously. Here, we used postembedding immunogold electron microscopy to determine the subsynaptic localization of synaptotagmin 1 in rat hippocampal CA1 Schaffer collateral synapses. We report for the first time that synaptotagmin 1 is present in rat hippocampal postsynaptic spines, both on cytoplasmic vesicles and at the postsynaptic density...
November 2017: Hippocampus
https://www.readbyqxmd.com/read/28612339/osteocyte-mechanobiology
#17
REVIEW
Yuhei Uda, Ehab Azab, Ningyuan Sun, Chao Shi, Paola Divieti Pajevic
PURPOSE OF REVIEW: Over the past decades, osteocytes have emerged as mechano-sensors of bone and master regulators of bone homeostasis. This article summarizes latest research and progress made in understanding osteocyte mechanobiology and critically reviews tools currently available to study these cells. RECENT FINDINGS: Whereas increased mechanical forces promote bone formation, decrease loading is always associated with bone loss and skeletal fragility. Recent studies identified cilia, integrins, calcium channels, and G-protein coupled receptors as important sensors of mechanical forces and Ca(2+) and cAMP signaling as key effectors...
August 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28611595/mtorc1-is-a-local-postsynaptic-voltage-sensor-regulated-by-positive-and-negative-feedback-pathways
#18
Farr Niere, Kimberly F Raab-Graham
The mammalian/mechanistic target of rapamycin complex 1 (mTORC1) serves as a regulator of mRNA translation. Recent studies suggest that mTORC1 may also serve as a local, voltage sensor in the postsynaptic region of neurons. Considering biochemical, bioinformatics and imaging data, we hypothesize that the activity state of mTORC1 dynamically regulates local membrane potential by promoting and repressing protein synthesis of select mRNAs. Our hypothesis suggests that mTORC1 uses positive and negative feedback pathways, in a branch-specific manner, to maintain neuronal excitability within an optimal range...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28597792/implications-of-the-calcium-sensing-receptor-in-ischemia-reperfusion
#19
François Paquot, Justine Huart, Jean-Olivier Defraigne, Jean-Marie Krzesinski, François Jouret
The calcium-sensing receptor (CaSR) is a G protein-coupled receptor (GPCR) which was first isolated from bovine parathyroid glands. Its complex structure has been well characterized, which helped to better understand its function. The CaSR activity can be modulated by various ligands, either activators (also called "calcimimetics") or inhibitors (or "calcilytics"). The main role of the CaSR concerns Ca2+ homeostasis. In bone, intestine and kidney, the CaSR acts as a sensor for extracellular ionized Ca2+ concentration ([Ca2+]e) to keep it stable...
April 2017: Acta Cardiologica
https://www.readbyqxmd.com/read/28570539/monitoring-er-sr-calcium-release-with-the-targeted-ca2-sensor-catcher
#20
Florence N Reddish, Cassandra L Miller, Rakshya Gorkhali, Jenny J Yang
Intracellular calcium (Ca(2+)) transients evoked by extracellular stimuli initiate a multitude of biological processes in living organisms. At the center of intracellular calcium release are the major intracellular calcium storage organelles, the endoplasmic reticulum (ER) and the more specialized sarcoplasmic reticulum (SR) in muscle cells. The dynamic release of calcium from these organelles is mediated by the ryanodine receptor (RyR) and the inositol 1,4,5-triphosphate receptor (IP3R) with refilling occurring through the sarco/endoplasmic reticulum calcium ATPase (SERCA) pump...
May 19, 2017: Journal of Visualized Experiments: JoVE
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