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https://www.readbyqxmd.com/read/28935720/suppression-of-store-operated-ca-2-entry-by-activation-of-gper-contribution-to-a-clamping-effect-on-endothelial-ca-2-signaling
#1
Lara E Terry, Mark VerMeer, Jennifer Giles, Quang-Kim Tran
The G Protein-coupled Estrogen Receptor 1 (GPER, formerly a.k.a. GPR30) modulates many Ca(2+)-dependent activities in endothelial cells. However, the underlying mechanisms are poorly understood. We recently reported that GPER acts to prolong cytoplasmic Ca(2+) signals by interacting with and promoting inhibitory phosphorylation of the plasma membrane Ca(2+)-ATPase. In this study, we examined the role of GPER activation in modulating store-operated Ca(2+) entry (SOCE) via effects on the Stromal Interaction Molecule 1 (STIM1)...
September 21, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28930597/the-store-operated-calcium-channels-in-cancer-metastasis-from-cell-migration-invasion-to-metastatic-colonization
#2
Pingli Mo, Shengyu Yang
Store-operated calcium entry (SOCE) is the predominant calcium entry mechanism in most cancer cells. SOCE is mediated by the endoplasmic reticulum calcium sensor STIMs (STIM1 and 2) and plasma membrane channel forming unit Orais (Orai 1-3). In recent years there is increasing evidence indicating that SOCE in cancer cells is dysregulated to promote cancer cell migration, invasion and metastasis. The overexpression of STIM and Orai proteins has been reported to correlate with the metastatic progression of various cancers...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28928244/selective-inhibitory-effects-of-zinc-on-cell-proliferation-in-esophageal-squamous-cell-carcinoma-through-orai1
#3
Sangyong Choi, Chaochu Cui, Yanhong Luo, Sun-Hee Kim, Jae-Kyun Ko, Xiaofang Huo, Jianjie Ma, Li-Wu Fu, Rhonda F Souza, Irina Korichneva, Zui Pan
Zinc, an essential micronutrient, has a cancer preventive role. Zinc deficiency has been shown to contribute to the progression of esophageal cancer. Orai1, a store-operated Ca(2+) entry (SOCE) channel, was previously reported to be highly expressed in tumor tissues removed from patients with esophageal squamous cell carcinoma (ESCC) with poor prognosis, and elevation of its expression contributes to both hyperactive intracellular Ca(2+) oscillations and fast cell proliferation in human ESCC cells. However, the molecular basis of cancer preventive functions of zinc and its association with Orai1-mediated cell proliferation remains unknown...
September 19, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28921392/resveratrol-attenuates-high-glucose-induced-endothelial-cell-apoptosis-via-mediation-of-store-operated-calcium-entry
#4
Ting Lu, Dayan Zhou, Pan Gao, Liangyi Si, Qiang Xu
The aim of this study was to evaluate the influence of resveratrol on HG-induced calcium entry in islet microvascular (MS-1) endothelial cells. MS-1 cells were pretreated with resveratrol or 2-APB (an inhibitor of store-operated calcium entry) and then incubated with high glucose. Cell viability was determined using the cell counting kit-8 method. Reactive oxygen species, endothelial apoptosis, and NO production were detected by DHE probe, TUNEL detection, and nitrate reductase assay kit. Protein levels of SOCE were detected by western blotting...
September 18, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28919480/cholesterol-modulates-the-cellular-localization-of-orai1-channels-and-its-disposition-among-membrane-domains
#5
A Bohórquez-Hernández, Enrico Gratton, Jonathan Pacheco, Alexander Asanov, Luis Vaca
Store Operated Calcium Entry (SOCE) is one of the most important mechanisms for calcium mobilization in to the cell. Two main proteins sustain SOCE: STIM1 that acts as the calcium sensor in the endoplasmic reticulum (ER) and Orai1 responsible for calcium influx upon depletion of ER. There are many studies indicating that SOCE is modulated by the cholesterol content of the plasma membrane (PM). However, a myriad of questions remain unanswered concerning the precise molecular mechanism by which cholesterol modulates SOCE...
September 13, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28912430/stim1-dependent-ca-2-signaling-regulates-podosome-formation-to-facilitate-cancer-cell-invasion
#6
Yun-Wen Chen, Yih-Fung Chen, Wen-Tai Chiu, Hong-Chen Chen, Meng-Ru Shen
The clinical significance of STIM proteins and Orai Ca(2+) channels in tumor progression has been demonstrated in different types of cancers. Podosomes are dynamic actin-rich cellular protrusions that facilitate cancer cell invasiveness by degrading extracellular matrix. Whether STIM1-dependent Ca(2+) signaling facilitates cancer cell invasion through affecting podosome formation remains unclear. Here we show that the invasive fronts of cancer tissues overexpress STIM1, accompanied by active store-operated Ca(2+) entry (SOCE)...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28903423/mitochondria-sustain-store-operated-currents-in-colon-cancer-cells-but-not-in-normal-colonic-cells-reversal-by-non-steroidal-anti-inflammatory-drugs
#7
Miriam Hernández-Morales, Diego Sobradillo, Ruth A Valero, Eva Muñoz, Daniel Ubierna, Mary P Moyer, Lucía Núñez, Carlos Villalobos
Tumor cells undergo a critical remodeling of intracellular Ca(2+) homeostasis that contribute to important cancer hallmarks. Store-operated Ca(2+) entry (SOCE), a Ca(2+) entry pathway modulated by mitochondria, is dramatically enhanced in colon cancer cells. In addition, most cancer cells display the Warburg effect, a metabolic switch from mitochondrial metabolism to glycolysis that provides survival advantages. Accordingly, we investigated mitochondria control of store-operated currents (SOCs) in two cell lines previously selected for representing human normal colonic cells and colon cancer cells...
August 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28900936/metabolic-disorders-and-cancer-store-operated-ca-2-entry-in-cancer-focus-on-ip3r-mediated-ca-2-release-from-intracellular-stores-and-its-role-in-migration-and-invasion
#8
Abigaël Ritaine, George Shapovalov, Natalia Prevarskaya
Store-operated calcium entry (SOCE) plays important roles in a multitude of cellular processes, from muscle contraction to cellular proliferation and migration. Dysregulation of SOCE is responsible for the advancement of multiple diseases, ranging from immune diseases, myopathies, to terminal ones like cancer. Naturally, SOCE has been a focus of many studies and review papers which, however, primarily concentrated on the principal players localized to the plasma membrane and responsible for Ca(2+) entry into the cell...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900935/metabolic-disorders-and-cancer-hepatocyte-store-operated-ca-2-channels-in-nonalcoholic-fatty-liver-disease
#9
Eunüs S Ali, Grigori Y Rychkov, Greg J Barritt
In steatotic hepatocytes, intracellular Ca(2+) homeostasis is substantially altered compared to normal. Decreased Ca(2+) in the endoplasmic reticulum (ER) can lead to ER stress, an important mediator of the progression of liver steatosis to nonalcoholic steatohepatitis, type 2 diabetes, and hepatocellular carcinoma. Store-operated Ca(2+) channels (SOCs) in hepatocytes are composed principally of Orai1 and STIM1 proteins. Their main role is the maintenance of adequate Ca(2+) in the lumen of the ER. In steatotic hepatocytes, store-operated Ca(2+) entry (SOCE) is substantially inhibited...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900934/fertility-store-operated-ca-2-entry-in-germ-cells-role-in-egg-activation
#10
Zoltan Machaty, Chunmin Wang, Kiho Lee, Lu Zhang
At the time of fertilization, the sperm activates the egg and induces embryonic development by triggering an elevation in the egg's intracellular free Ca(2+) concentration. In mammals the initial Ca(2+) rise is followed by a series of repetitive Ca(2+) transients (known as oscillations) that last for several hours. Although the source of Ca(2+) during the signaling process is primarily the egg's smooth endoplasmic reticulum, the oscillations stop in the absence of extracellular Ca(2+) indicating that a Ca(2+) influx across the plasma membrane is essential to sustain them...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900933/neurological-and-motor-disorders-trpc-in-the-skeletal-muscle
#11
Sophie Saüc, Maud Frieden
Transient receptor potential canonical (TRPC) channels belong to the large family of TRPs that are mostly nonselective cation channels with a great variety of gating mechanisms. TRPC are composed of seven members that can all be activated downstream of agonist-induced phospholipase C stimulation, but some members are also stretch-activated and/or are part of the store-operated Ca(2+) entry (SOCE) pathway. Skeletal muscles generate contraction via an explosive increase of cytosolic Ca(2+) concentration resulting almost exclusively from sarcoplasmic reticulum Ca(2+) channel opening...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900932/neurological-and-motor-disorders-neuronal-store-operated-ca-2-signaling-an-overview-and-its-function
#12
Sunitha Bollimuntha, Biswaranjan Pani, Brij B Singh
Calcium (Ca(2+)) is a ubiquitous second messenger that performs significant physiological task such as neurosecretion, exocytosis, neuronal growth/differentiation, and the development and/or maintenance of neural circuits. An important regulatory aspect of neuronal Ca(2+) homeostasis is store-operated Ca(2+) entry (SOCE) which, in recent years, has gained much attention for influencing a variety of nerve cell responses. Essentially, activation of SOCE ensues following the activation of the plasma membrane (PM) store-operated Ca(2+) channels (SOCC) triggered by the depletion of endoplasmic reticulum (ER) Ca(2+) stores...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900931/cardiac-remodeling-and-disease-current-understanding-of-stim1-orai1-mediated-store-operated-ca-2-entry-in-cardiac-function-and-pathology
#13
Fiona Bartoli, Jessica Sabourin
For a long time, Ca(2+) entry into cardiomyocytes was considered the sole domain of the L-type Ca(2+) channel. Recently, STIM1/Orai1-mediated store-operated Ca(2+) entry has been also reported to participate to Ca(2+) influx in cardiac cells and has emerged as a key player to alter Ca(2+) in the cardiomyocyte. In this review, we will highlight accumulated knowledge about the presence and the potential contribution of STIM1/Orai1-dependent SOCE to cardiac function and its role in the cardiac pathogenesis. Overall, even if STIM1/Orai1 proteins are present in the heart, contradictory results have been reported regarding their contribution to cardiac physiology and pathology, pointing out the necessity of further investigations, a major challenge over the coming years...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900930/cardiac-remodeling-and-disease-soce-and-trpc-signaling-in-cardiac-pathology
#14
Petra Eder
TRPC channels have been suggested as potential candidates mediating store-operated Ca(2+) entry (SOCE) in cardiomyocytes. There is increasing evidence that the TRPC isoforms TRPC1 and TRPC4 might fulfill the function as SOCs, in concert with or in parallel to the key players of SOCE, Orai1, and STIM1. Several other isoforms, e.g., TRPC3, TRPC6, and TRPC7, might rather associate to receptor-activated diacylglycerol (DAG)-sensitive ion channels. However, the exact activation mode has not been elucidated yet, given the characteristic of TRPC channels to heteromerize to unpredictable ion channel assemblies...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900929/cardiovascular-and-hemostatic-disorders-soce-in-cardiovascular-cells-emerging-targets-for-therapeutic-intervention
#15
Klaus Groschner, Niroj Shrestha, Nicola Fameli
The discovery of the store-operated Ca(2+) entry (SOCE) phenomenon is tightly associated with its recognition as a pathway of high (patho)physiological significance in the cardiovascular system. Early on, SOCE has been investigated primarily in non-excitable cell types, and the vascular endothelium received particular attention, while a role of SOCE in excitable cells, specifically cardiac myocytes and pacemakers, was initially ignored and remains largely enigmatic even to date. With the recent gain in knowledge on the molecular components of SOCE as well as their cellular organization within nanodomains, potential tissue/cell type-dependent heterogeneity of the SOCE machinery along with high specificity of linkage to downstream signaling pathways emerged for cardiovascular cells...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900928/cardiovascular-and-hemostatic-disorders-soce-and-ca-2-handling-in-platelet-dysfunction
#16
Jose J Lopez, Gines M Salido, Juan A Rosado
Among the Ca(2+) entry mechanisms in platelets, store-operated Ca(2+) entry (SOCE) plays a prominent role as it is necessary to achieve full activation of platelet functions and replenish intracellular Ca(2+) stores. In platelets, as in other non-excitable cells, SOCE has been reported to involve the activation of plasma membrane channels by the ER Ca(2+) sensor STIM1. Despite electrophysiological studies are not possible in human platelets, indirect analyses have revealed that the Ca(2+)-permeable channels involve Orai1 and, most likely, TRPC1 subunits...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900927/cardiovascular-and-hemostatic-disorders-role-of-stim-and-orai-proteins-in-vascular-disorders
#17
Jyoti Tanwar, Mohamed Trebak, Rajender K Motiani
Store-operated Ca(2+) entry (SOCE) mediated by STIM and Orai proteins is a highly regulated and ubiquitous signaling pathway that plays an important role in various cellular and physiological functions. Endoplasmic reticulum (ER) serves as the major site for intracellular Ca(2+) storage. Stromal Interaction Molecule 1/2 (STIM1/2) sense decrease in ER Ca(2+) levels and transmits the message to plasma membrane Ca(2+) channels constituted by Orai family members (Orai1/2/3) resulting in Ca(2+) influx into the cells...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900926/immunological-disorders-regulation-of-ca-2-signaling-in-t-lymphocytes
#18
Sonal Srikanth, Jin Seok Woo, Zuoming Sun, Yousang Gwack
Engagement of T cell receptors (TCRs) with cognate antigens triggers cascades of signaling pathways in helper T cells. TCR signaling is essential for the effector function of helper T cells including proliferation, differentiation, and cytokine production. It also modulates effector T cell fate by inducing cell death, anergy (nonresponsiveness), exhaustion, and generation of regulatory T cells. One of the main axes of TCR signaling is the Ca(2+)-calcineurin-nuclear factor of activated T cells (NFAT) signaling pathway...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900925/introduction-overview-of-the-pathophysiological-implications-of-store-operated-calcium-entry-in-mammalian-cells
#19
Juan A Rosado
Since store-operated Ca(2+) entry (SOCE) was proposed by Putney three decades ago (Putney. Cell Calcium 7:1-12, 1986), its functional role and involvement in the pathophysiology of a number of disorders has been investigated. The role of SOCE in cell physiology has been discussed in the previous chapters, and the following part is devoted to the current knowledge concerning the mechanisms underlying the development of certain diseases that involve SOCE abnormalities.
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28900924/tissue-specificity-store-operated-ca-2-entry-in-cardiac-myocytes
#20
Martin D Bootman, Katja Rietdorf
Calcium (Ca(2+)) is a key regulator of cardiomyocyte contraction. The Ca(2+) channels, pumps, and exchangers responsible for the cyclical cytosolic Ca(2+) signals that underlie contraction are well known. In addition to those Ca(2+) signaling components responsible for contraction, it has been proposed that cardiomyocytes express channels that promote the influx of Ca(2+) from the extracellular milieu to the cytosol in response to depletion of intracellular Ca(2+) stores. With non-excitable cells, this store-operated Ca(2+) entry (SOCE) is usually easily demonstrated and is essential for prolonging cellular Ca(2+) signaling and for refilling depleted Ca(2+) stores...
2017: Advances in Experimental Medicine and Biology
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