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Store-Operated Ca²⁺ Entry (SOCE) Pathways

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Cover of 'Store-Operated Ca²⁺ Entry (SOCE) Pathways'

Table of Contents

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    Book Overview
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    Chapter 1 Introduction
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    Chapter 2 The STIM-Orai Pathway: STIM-Orai Structures: Isolated and in Complex
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    Chapter 3 The STIM-Orai Pathway: Orai, the Pore-Forming Subunit of the CRAC Channel
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    Chapter 4 The STIM-Orai Pathway: The Interactions Between STIM and Orai
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    Chapter 5 The STIM-Orai Pathway: Conformational Coupling Between STIM and Orai in the Activation of Store-Operated Ca2+ Entry
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    Chapter 6 The STIM-Orai Pathway: Regulation of STIM and Orai by Thiol Modifications
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    Chapter 7 The STIM-Orai Pathway: Light-Operated Ca2+ Entry Through Engineered CRAC Channels
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    Chapter 8 STIM-TRP Pathways and Microdomain Organization: Ca2+ Influx Channels: The Orai-STIM1-TRPC Complexes
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    Chapter 9 STIM-TRP Pathways and Microdomain Organization: Contribution of TRPC1 in Store-Operated Ca2+ Entry: Impact on Ca2+ Signaling and Cell Function
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    Chapter 10 STIM-TRP Pathways and Microdomain Organization: Auxiliary Proteins of the STIM/Orai Complex
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    Chapter 11 Introduction
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    Chapter 12 New Aspects of the Contribution of ER to SOCE Regulation: The Role of the ER and ER-Plasma Membrane Junctions in the Regulation of SOCE
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    Chapter 13 New Aspects of the Contribution of ER to SOCE Regulation: TRPC Proteins as a Link Between Plasma Membrane Ion Transport and Intracellular Ca2+ Stores
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    Chapter 14 The Role of Mitochondria in the Activation/Maintenance of SOCE: Store-Operated Ca2+ Entry and Mitochondria
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    Chapter 15 The Role of Mitochondria in the Activation/Maintenance of SOCE: Membrane Contact Sites as Signaling Hubs Sustaining Store-Operated Ca2+ Entry
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    Chapter 16 The Role of Mitochondria in the Activation/Maintenance of SOCE: The Contribution of Mitochondrial Ca2+ Uptake, Mitochondrial Motility, and Location to Store-Operated Ca2+ Entry
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    Chapter 17 Tissue Specificity: The Role of Organellar Membrane Nanojunctions in Smooth Muscle Ca2+ Signaling
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    Chapter 18 Tissue Specificity: SOCE: Implications for Ca2+ Handling in Endothelial Cells
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    Chapter 19 Tissue Specificity: Store-Operated Ca2+ Entry in Cardiac Myocytes
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    Chapter 20 Introduction: Overview of the Pathophysiological Implications of Store-Operated Calcium Entry in Mammalian Cells
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    Chapter 21 Immunological Disorders: Regulation of Ca2+ Signaling in T Lymphocytes
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    Chapter 22 Cardiovascular and Hemostatic Disorders: Role of STIM and Orai Proteins in Vascular Disorders
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    Chapter 23 Cardiovascular and Hemostatic Disorders: SOCE and Ca2+ Handling in Platelet Dysfunction
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    Chapter 24 Cardiovascular and Hemostatic Disorders: SOCE in Cardiovascular Cells: Emerging Targets for Therapeutic Intervention
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    Chapter 25 Cardiac Remodeling and Disease: SOCE and TRPC Signaling in Cardiac Pathology
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    Chapter 26 Cardiac Remodeling and Disease: Current Understanding of STIM1/Orai1-Mediated Store-Operated Ca2+ Entry in Cardiac Function and Pathology
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    Chapter 27 Neurological and Motor Disorders: Neuronal Store-Operated Ca2+ Signaling: An Overview and Its Function
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    Chapter 28 Neurological and Motor Disorders: TRPC in the Skeletal Muscle
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    Chapter 29 Fertility: Store-Operated Ca2+ Entry in Germ Cells: Role in Egg Activation
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    Chapter 30 Metabolic Disorders and Cancer: Hepatocyte Store-Operated Ca2+ Channels in Nonalcoholic Fatty Liver Disease
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    Chapter 31 Metabolic Disorders and Cancer: Store-Operated Ca2+ Entry in Cancer: Focus on IP3R-Mediated Ca2+ Release from Intracellular Stores and Its Role in Migration and Invasion
Attention for Chapter 30: Metabolic Disorders and Cancer: Hepatocyte Store-Operated Ca2+ Channels in Nonalcoholic Fatty Liver Disease
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Chapter title
Metabolic Disorders and Cancer: Hepatocyte Store-Operated Ca2+ Channels in Nonalcoholic Fatty Liver Disease
Chapter number 30
Book title
Store-Operated Ca²⁺ Entry (SOCE) Pathways
Published in
Advances in experimental medicine and biology, January 2017
DOI 10.1007/978-3-319-57732-6_30
Pubmed ID
Book ISBNs
978-3-31-957731-9, 978-3-31-957732-6
Authors

Eunüs S. Ali, Grigori Y. Rychkov, Greg J. Barritt

Abstract

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. This inhibition is associated with a decrease in Ca(2+) in the ER. Lipid-induced inhibition of SOCE is mediated by protein kinase C (PKC) and may involve the phosphorylation and subsequent inhibition of Orai1. Experimental inhibition of SOCE enhances lipid accumulation in normal hepatocytes incubated in the presence of exogenous fatty acids. The antidiabetic drug exendin-4 reverses the lipid-induced inhibition of SOCE and decreases liver lipid with rapid onset. It is proposed that lipid-induced inhibition of SOCE in the plasma membrane and of SERCA2b in the ER membrane leads to a persistent decrease in ER Ca(2+), ER stress, and the ER stress response, which in turn enhances (amplifies) lipid accumulation. A low level of persistent SOCE due to chronic ER Ca(2+) depletion in steatotic hepatocytes may contribute to an elevated cytoplasmic-free Ca(2+) concentration leading to the activation of calcium-calmodulin kinase II (CaMKII), decreased lipid removal by autophagy, and insulin resistance. It is concluded that lipid-induced inhibition of SOCE plays an important role in the progression of liver steatosis to insulin insensitivity and hepatocellular carcinoma.

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 27 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 27 100%

Demographic breakdown

Readers by professional status Count As %
Researcher 6 22%
Student > Master 5 19%
Student > Bachelor 3 11%
Student > Ph. D. Student 3 11%
Student > Postgraduate 2 7%
Other 4 15%
Unknown 4 15%
Readers by discipline Count As %
Biochemistry, Genetics and Molecular Biology 9 33%
Medicine and Dentistry 5 19%
Agricultural and Biological Sciences 3 11%
Unspecified 1 4%
Immunology and Microbiology 1 4%
Other 2 7%
Unknown 6 22%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 08 December 2020.
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#13,717,490
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Outputs from Advances in experimental medicine and biology
#2,296
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Outputs of similar age
#210,273
of 282,765 outputs
Outputs of similar age from Advances in experimental medicine and biology
#2
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