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Mamenko M, Dhande I, Tomilin V, Zaika O, Boukelmoune N, Zhu Y, Gonzalez-Garay ML, Pochynyuk O, Doris PA. Defective Store-Operated Calcium Entry Causes Partial Nephrogenic Diabetes Insipidus. J Am Soc Nephrol 2015; 27:2035-48. [PMID: 26574044 DOI: 10.1681/asn.2014121200] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 09/23/2015] [Indexed: 12/12/2022] Open
Abstract
Store-operated calcium entry (SOCE) is the mechanism by which extracellular signals elicit prolonged intracellular calcium elevation to drive changes in fundamental cellular processes. Here, we investigated the role of SOCE in the regulation of renal water reabsorption, using the inbred rat strain SHR-A3 as an animal model with disrupted SOCE. We found that SHR-A3, but not SHR-B2, have a novel truncating mutation in the gene encoding stromal interaction molecule 1 (STIM1), the endoplasmic reticulum calcium (Ca(2+)) sensor that triggers SOCE. Balance studies revealed increased urine volume, hypertonic plasma, polydipsia, and impaired urinary concentrating ability accompanied by elevated circulating arginine vasopressin (AVP) levels in SHR-A3 compared with SHR-B2. Isolated, split-open collecting ducts (CD) from SHR-A3 displayed decreased basal intracellular Ca(2+) levels and a major defect in SOCE. Consequently, AVP failed to induce the sustained intracellular Ca(2+) mobilization that requires SOCE in CD cells from SHR-A3. This effect decreased the abundance of aquaporin 2 and enhanced its intracellular retention, suggesting impaired sensitivity of the CD to AVP in SHR-A3. Stim1 knockdown in cultured mpkCCDc14 cells reduced SOCE and basal intracellular Ca(2+) levels and prevented AVP-induced translocation of aquaporin 2, further suggesting the effects in SHR-A3 result from the expression of truncated STIM1. Overall, these results identify a novel mechanism of nephrogenic diabetes insipidus and uncover a role of SOCE in renal water handling.
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Affiliation(s)
| | - Isha Dhande
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas; and
| | - Viktor Tomilin
- Department of Integrative Biology and Pharmacology, and Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Oleg Zaika
- Department of Integrative Biology and Pharmacology, and
| | | | - Yaming Zhu
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas; and
| | - Manuel L Gonzalez-Garay
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas; and
| | | | - Peter A Doris
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas; and
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Georgiev T, Svirin M, Jaimovich E, Fink RHA. Localized nuclear and perinuclear Ca(2+) signals in intact mouse skeletal muscle fibers. Front Physiol 2015; 6:263. [PMID: 26483696 PMCID: PMC4586431 DOI: 10.3389/fphys.2015.00263] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/07/2015] [Indexed: 11/13/2022] Open
Abstract
Nuclear Ca2+ is important for the regulation of several nuclear processes such as gene expression. Localized Ca2+ signals (LCSs) in skeletal muscle fibers of mice have been mainly studied as Ca2+ release events from the sarcoplasmic reticulum. Their location with regard to cell nuclei has not been investigated. Our study is based on the hypothesis that LCSs associated with nuclei are present in skeletal muscle fibers of adult mice. Therefore, we carried out experiments addressing this question and we found novel Ca2+ signals associated with nuclei of skeletal muscle fibers (with possibly attached satellite cells). We measured localized nuclear and perinuclear Ca2+ signals (NLCSs and PLCSs) alongside cytosolic localized Ca2+ signals (CLCSs) during a hypertonic treatment. We also observed NLCSs under isotonic conditions. The NLCSs and PLCSs are Ca2+ signals in the range of micrometer [FWHM (full width at half maximum): 2.75 ± 0.27 μm (NLCSs) and 2.55 ± 0.17 μm (PLCSs), S.E.M.]. Additionally, global nuclear Ca2+ signals (NGCSs) were observed. To investigate which type of Ca2+ channels contribute to the Ca2+ signals associated with nuclei in skeletal muscle fibers, we performed measurements with the RyR blocker dantrolene, the DHPR blocker nifedipine or the IP3R blocker Xestospongin C. We observed Ca2+ signals associated with nuclei in the presence of each blocker. Nifedipine and dantrolene had an inhibitory effect on the fraction of fibers with PLCSs. The situation for the fraction of fibers with NLCSs is more complex indicating that RyR is less important for the generation of NLCSs compared to the generation of PLCSs. The fraction of fibers with NLCSs and PLCSs is not reduced in the presence of Xestospongin C. The localized perinuclear and intranuclear Ca2+ signals may be a powerful tool for the cell to regulate adaptive processes as gene expression. The intranuclear Ca2+ signals may be particularly interesting in this respect.
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Affiliation(s)
- Tihomir Georgiev
- Medical Biophysics Unit, Institut für Physiologie und Pathophysiologie, Ruprecht Karls Universität Heidelberg, Germany ; Facultad de Medicina, Center for Molecular Studies of the Cell, Universidad de Chile Santiago de Chile, Chile
| | - Mikhail Svirin
- Medical Biophysics Unit, Institut für Physiologie und Pathophysiologie, Ruprecht Karls Universität Heidelberg, Germany
| | - Enrique Jaimovich
- Facultad de Medicina, Center for Molecular Studies of the Cell, Universidad de Chile Santiago de Chile, Chile
| | - Rainer H A Fink
- Medical Biophysics Unit, Institut für Physiologie und Pathophysiologie, Ruprecht Karls Universität Heidelberg, Germany
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Zhu H, Zhang H, Jin F, Fang M, Huang M, Yang CS, Chen T, Fu L, Pan Z. Elevated Orai1 expression mediates tumor-promoting intracellular Ca2+ oscillations in human esophageal squamous cell carcinoma. Oncotarget 2015; 5:3455-71. [PMID: 24797725 PMCID: PMC4116495 DOI: 10.18632/oncotarget.1903] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Effective treatment as well as prognostic biomarker for malignant esophageal squamous cell carcinoma (ESCC) is urgently needed. The present study was aimed at identifying oncogenic genes involving dysregulated intracellular Ca2+ signaling, which is known to function importantly in cellular proliferation and migration. Tumors from patients with ESCC were found to display elevated expression of Orai1, a store-operated Ca2+ entry (SOCE) channel, and the high expression of Orai1 was associated with poor overall and recurrence-free survival. In contrast to the quiescent nature of non-tumorigenic epithelial cells, human ESCC cells exhibited strikingly hyperactive in intracellular Ca2+ oscillations, which were sensitive to treatments with Orai1 channel blockers and to orai1 silencing. Moreover, pharmacologic inhibition of Orai1 activity or reduction of Orai1 expression suppressed proliferation and migration of ESCC in vitro and slowed tumor formation and growth in in vivo xenografted mice. Combined, these findings provide the first evidence to imply Orai1 as a novel biomarker for ESCC prognostic stratification and also highlight Orai1-mediated Ca2+ signaling pathway as a potential target for treatment of this deadly disease.
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Affiliation(s)
- Hua Zhu
- Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Surgery, The Ohio State University Wexner Medical Center, Columbus, OH
| | | | | | | | | | | | | | - Liwu Fu
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center of Cancer Medicine, Guangzhou, China
| | - Zui Pan
- Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH; Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH
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Sopariwala DH, Pant M, Shaikh SA, Goonasekera SA, Molkentin JD, Weisleder N, Ma J, Pan Z, Periasamy M. Sarcolipin overexpression improves muscle energetics and reduces fatigue. J Appl Physiol (1985) 2015; 118:1050-8. [PMID: 25701006 DOI: 10.1152/japplphysiol.01066.2014] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 02/17/2015] [Indexed: 12/21/2022] Open
Abstract
Sarcolipin (SLN) is a regulator of sarcoendoplasmic reticulum calcium ATPase in skeletal muscle. Recent studies using SLN-null mice have identified SLN as a key player in muscle thermogenesis and metabolism. In this study, we exploited a SLN overexpression (Sln(OE)) mouse model to determine whether increased SLN level affected muscle contractile properties, exercise capacity/fatigue, and metabolic rate in whole animals and isolated muscle. We found that Sln(OE) mice are more resistant to fatigue and can run significantly longer distances than wild-type (WT). Studies with isolated extensor digitorum longus (EDL) muscles showed that Sln(OE) EDL produced higher twitch force than WT. The force-frequency curves were not different between WT and Sln(OE) EDLs, but at lower frequencies the pyruvate-induced potentiation of force was significantly higher in Sln(OE) EDL. SLN overexpression did not alter the twitch and force-frequency curve in isolated soleus muscle. However, during a 10-min fatigue protocol, both EDL and soleus from Sln(OE) mice fatigued significantly less than WT muscles. Interestingly, Sln(OE) muscles showed higher carnitine palmitoyl transferase-1 protein expression, which could enhance fatty acid metabolism. In addition, lactate dehydrogenase expression was higher in Sln(OE) EDL, suggesting increased glycolytic capacity. We also found an increase in store-operated calcium entry (SOCE) in isolated flexor digitorum brevis fibers of Sln(OE) compared with WT mice. These data allow us to conclude that increased SLN expression improves skeletal muscle performance during prolonged muscle activity by increasing SOCE and muscle energetics.
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Affiliation(s)
- Danesh H Sopariwala
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio
| | - Meghna Pant
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio
| | - Sana A Shaikh
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio
| | | | - Jeffery D Molkentin
- Department of Pediatrics, University of Cincinnati, Cincinnati, Ohio; Howard Hughes Medical Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
| | - Noah Weisleder
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio
| | - Jianjie Ma
- Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
| | - Zui Pan
- Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio
| | - Muthu Periasamy
- Department of Physiology and Cell Biology, College of Medicine, The Ohio State University, Columbus, Ohio; Davis Heart and Lung Research Institute, The Ohio State University, Columbus, Ohio;
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