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Kurisawa N, Iwasaki A, Teranuma K, Dan S, Toyoshima C, Hashimoto M, Suenaga K. Structural Determination, Total Synthesis, and Biological Activity of Iezoside, a Highly Potent Ca 2+-ATPase Inhibitor from the Marine Cyanobacterium Leptochromothrix valpauliae. J Am Chem Soc 2022; 144:11019-11032. [DOI: 10.1021/jacs.2c04459] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Naoaki Kurisawa
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Arihiro Iwasaki
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Kazuya Teranuma
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Shingo Dan
- Division of Molecular Pharmacology, Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, 3-8-31 Ariake, Koto-ku, Tokyo 135-8550, Japan
| | - Chikashi Toyoshima
- Institute for Quantitative Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Masaru Hashimoto
- Faculty of Agriculture and Life Science, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Kiyotake Suenaga
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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LaDisa JF, Bozdag S, Olson J, Ramchandran R, Kersten JR, Eddinger TJ. Gene Expression in Experimental Aortic Coarctation and Repair: Candidate Genes for Therapeutic Intervention? PLoS One 2015. [PMID: 26207811 PMCID: PMC4514739 DOI: 10.1371/journal.pone.0133356] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Coarctation of the aorta (CoA) is a constriction of the proximal descending thoracic aorta and is one of the most common congenital cardiovascular defects. Treatments for CoA improve life expectancy, but morbidity persists, particularly due to the development of chronic hypertension (HTN). Identifying the mechanisms of morbidity is difficult in humans due to confounding variables such as age at repair, follow-up duration, coarctation severity and concurrent anomalies. We previously developed an experimental model that replicates aortic pathology in humans with CoA without these confounding variables, and mimics correction at various times using dissolvable suture. Here we present the most comprehensive description of differentially expressed genes (DEGs) to date from the pathology of CoA, which were obtained using this model. Aortic samples (n=4/group) from the ascending aorta that experiences elevated blood pressure (BP) from induction of CoA, and restoration of normal BP after its correction, were analyzed by gene expression microarray, and enriched genes were converted to human orthologues. 51 DEGs with >6 fold-change (FC) were used to determine enriched Gene Ontology terms, altered pathways, and association with National Library of Medicine Medical Subject Headers (MeSH) IDs for HTN, cardiovascular disease (CVD) and CoA. The results generated 18 pathways, 4 of which (cell cycle, immune system, hemostasis and metabolism) were shared with MeSH ID’s for HTN and CVD, and individual genes were associated with the CoA MeSH ID. A thorough literature search further uncovered association with contractile, cytoskeletal and regulatory proteins related to excitation-contraction coupling and metabolism that may explain the structural and functional changes observed in our experimental model, and ultimately help to unravel the mechanisms responsible for persistent morbidity after treatment for CoA.
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Affiliation(s)
- John F. LaDisa
- Department of Biomedical Engineering, Marquette University, Milwaukee, Wisconsin, United States of America
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
- Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
- Herma Heart Center, Children’s Hospital of Wisconsin, Milwaukee, Wisconsin, United States of America
- * E-mail:
| | - Serdar Bozdag
- Department of Mathematics, Statistics, and Computer Science, Marquette University, Milwaukee, Wisconsin, United States of America
| | - Jessica Olson
- Department of Physiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Ramani Ramchandran
- Departments of Pediatrics and Obstetrics and Gynecology, Medical College of Wisconsin and the Developmental Vascular Biology Program, Children’s Hospital of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Judy R. Kersten
- Department of Anesthesiology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
- Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Thomas J. Eddinger
- Department of Biological Sciences, Marquette University, Milwaukee, Wisconsin, United States of America
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Bálint Z, Zabini D, Konya V, Nagaraj C, Végh AG, Váró G, Wilhelm I, Fazakas C, Krizbai IA, Heinemann A, Olschewski H, Olschewski A. Double-stranded RNA attenuates the barrier function of human pulmonary artery endothelial cells. PLoS One 2013; 8:e63776. [PMID: 23755110 PMCID: PMC3670875 DOI: 10.1371/journal.pone.0063776] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 04/05/2013] [Indexed: 11/18/2022] Open
Abstract
Circulating RNA may result from excessive cell damage or acute viral infection and can interact with vascular endothelial cells. Despite the obvious clinical implications associated with the presence of circulating RNA, its pathological effects on endothelial cells and the governing molecular mechanisms are still not fully elucidated. We analyzed the effects of double stranded RNA on primary human pulmonary artery endothelial cells (hPAECs). The effect of natural and synthetic double-stranded RNA (dsRNA) on hPAECs was investigated using trans-endothelial electric resistance, molecule trafficking, calcium (Ca2+) homeostasis, gene expression and proliferation studies. Furthermore, the morphology and mechanical changes of the cells caused by synthetic dsRNA was followed by in-situ atomic force microscopy, by vascular-endothelial cadherin and F-actin staining. Our results indicated that exposure of hPAECs to synthetic dsRNA led to functional deficits. This was reflected by morphological and mechanical changes and an increase in the permeability of the endothelial monolayer. hPAECs treated with synthetic dsRNA accumulated in the G1 phase of the cell cycle. Additionally, the proliferation rate of the cells in the presence of synthetic dsRNA was significantly decreased. Furthermore, we found that natural and synthetic dsRNA modulated Ca2+ signaling in hPAECs by inhibiting the sarco-endoplasmic Ca2+-ATPase (SERCA) which is involved in the regulation of the intracellular Ca2+ homeostasis and thus cell growth. Even upon synthetic dsRNA stimulation silencing of SERCA3 preserved the endothelial monolayer integrity. Our data identify novel mechanisms by which dsRNA can disrupt endothelial barrier function and these may be relevant in inflammatory processes.
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Affiliation(s)
- Zoltán Bálint
- Experimental Anesthesiology, Department of Anesthesia and Intensive Care Medicine, Medical University of Graz, Graz, Austria
- Ludwig Boltzmann Institute for Lung Vascular Research, Graz, Austria
| | - Diana Zabini
- Experimental Anesthesiology, Department of Anesthesia and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Viktoria Konya
- Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Graz, Austria
| | - Chandran Nagaraj
- Experimental Anesthesiology, Department of Anesthesia and Intensive Care Medicine, Medical University of Graz, Graz, Austria
| | - Attila G. Végh
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - György Váró
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Imola Wilhelm
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Csilla Fazakas
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - István A. Krizbai
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Akos Heinemann
- Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Graz, Austria
| | - Horst Olschewski
- Division of Pulmonology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Andrea Olschewski
- Experimental Anesthesiology, Department of Anesthesia and Intensive Care Medicine, Medical University of Graz, Graz, Austria
- Ludwig Boltzmann Institute for Lung Vascular Research, Graz, Austria
- * E-mail:
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Cubas R, Zhang S, Li M, Chen C, Yao Q. Trop2 expression contributes to tumor pathogenesis by activating the ERK MAPK pathway. Mol Cancer 2010; 9:253. [PMID: 20858281 PMCID: PMC2946292 DOI: 10.1186/1476-4598-9-253] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Accepted: 09/21/2010] [Indexed: 11/15/2022] Open
Abstract
Background Trop2 is a cell-surface glycoprotein overexpressed by a variety of epithelial carcinomas with reported low to restricted expression in normal tissues. Expression of Trop2 has been associated with increased tumor aggressiveness, metastasis and decreased patient survival, but the signaling mechanisms mediated by Trop2 are still unknown. Here, we studied the effects murine Trop2 (mTrop2) exerted on tumor cellular functions and some of the signaling mechanisms activated by this oncogene. Results mTrop2 expression significantly increased tumor cell proliferation at low serum concentration, migration, foci formation and anchorage-independent growth. These in vitro characteristics translated to increased tumor growth in both subcutaneous and orthotopic pancreatic cancer murine models and also led to increased liver metastasis. mTrop2 expression also increased the levels of phosphorylated ERK1/2 mediating cell cycle progression by increasing the levels of cyclin D1 and cyclin E as well as downregulating p27. The activation of ERK was also observed in human pancreatic ductal epithelial cells and colorectal adenocarcinoma cells overexpressing human Trop2. Conclusions These findings demonstrate some of the pathogenic effects mediated by mTrop2 expression on cancer cells and the importance of targeting this cell surface glycoprotein. This study also provides the first indication of a molecular signaling pathway activated by Trop2 which has important implications for cancer cell growth and survival.
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Affiliation(s)
- Rafael Cubas
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA
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Ni HM, Baty CJ, Li N, Ding WX, Gao W, Li M, Chen X, Ma J, Michalopoulos GK, Yin XM. Bid agonist regulates murine hepatocyte proliferation by controlling endoplasmic reticulum calcium homeostasis. Hepatology 2010; 52:338-48. [PMID: 20578150 PMCID: PMC2943424 DOI: 10.1002/hep.23672] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
UNLABELLED BH3-interacting domain death agonist (Bid), a BH3-only B cell lymphoma 2 family molecule, is generally known for its importance in activating the mitochondrial apoptosis pathway after death receptor engagement, particularly in hepatocytes. However, Bid also promotes hepatocyte proliferation during liver regeneration and carcinogenesis. This study was designed to examine the hypothesis that Bid regulates endoplasmic reticulum calcium concentration ([Ca(2+)](ER)) homeostasis to affect hepatocyte proliferation. We found that serum-stimulated hepatocyte proliferation was dependent on calcium, and the depletion of calcium with thapsigargin or ethylene glycol tetraacetic acid (EGTA) inhibited the proliferation. Subcellular fractionation showed that a portion of Bid was inserted into the endoplasmic reticulum (ER)-enriched membranes, and single-cell calcium imaging indicated that Bid was important for maintaining the [Ca(2+)](ER) level. Bid-deficient hepatocytes manifested delayed and reduced serum-stimulated proliferation, which was corrected by ionomycin or reconstitution of Bid, particularly an ER-targeted Bid. Finally, B cell lymphoma 2-associated X protein (Bax) could also be found in the ER-enriched membranes, and Bax deficiency caused the same proliferation defect. However, Bid/Bax double deletion in hepatocytes did not further augment the defect, which suggested that Bid and Bax worked by the same regulatory mechanism in [Ca(2+)](ER) control. CONCLUSION Bid regulates hepatocyte proliferation by positively affecting [Ca(2+)](ER) homeostasis, and this could be important for liver regeneration and carcinogenesis.
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Affiliation(s)
- Hong-Min Ni
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Catherine J. Baty
- Department of Cell Biology and Physiology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Na Li
- Department of Physiology and Biophysics, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854
| | - Wen-Xing Ding
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Wentao Gao
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Min Li
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Xiaoyun Chen
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
| | - Jianjie Ma
- Department of Physiology and Biophysics, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854
| | | | - Xiao-Ming Yin
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261
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Thapa D, Kwon JB, Kim JA. Role of Intracellular Calcium in Clotrimazole-Induced Alteration of Cell Cycle Inhibitors, p53 and p27, in HT29 Human Colon Adenocarcinoma Cells. Biomol Ther (Seoul) 2008. [DOI: 10.4062/biomolther.2008.16.1.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Thibault O, Gant JC, Landfield PW. Expansion of the calcium hypothesis of brain aging and Alzheimer's disease: minding the store. Aging Cell 2007; 6:307-17. [PMID: 17465978 PMCID: PMC1974776 DOI: 10.1111/j.1474-9726.2007.00295.x] [Citation(s) in RCA: 287] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Evidence accumulated over more than two decades has implicated Ca2+ dysregulation in brain aging and Alzheimer's disease (AD), giving rise to the Ca2+ hypothesis of brain aging and dementia. Electrophysiological, imaging, and behavioral studies in hippocampal or cortical neurons of rodents and rabbits have revealed aging-related increases in the slow afterhyperpolarization, Ca2+ spikes and currents, Ca2+ transients, and L-type voltage-gated Ca2+ channel (L-VGCC) activity. Several of these changes have been associated with age-related deficits in learning or memory. Consequently, one version of the Ca2+ hypothesis has been that increased L-VGCC activity drives many of the other Ca2+-related biomarkers of hippocampal aging. In addition, other studies have reported aging- or AD model-related alterations in Ca2+ release from ryanodine receptors (RyR) on intracellular stores. The Ca2+-sensitive RyR channels amplify plasmalemmal Ca2+ influx by the mechanism of Ca2+-induced Ca2+ release (CICR). Considerable evidence indicates that a preferred functional link is present between L-VGCCs and RyRs which operate in series in heart and some brain cells. Here, we review studies implicating RyRs in altered Ca2+ regulation in cell toxicity, aging, and AD. A recent study from our laboratory showed that increased CICR plays a necessary role in the emergence of Ca2+-related biomarkers of aging. Consequently, we propose an expanded L-VGCC/Ca2+ hypothesis, in which aging/pathological changes occur in both L-type Ca2+ channels and RyRs, and interact to abnormally amplify Ca2+ transients. In turn, the increased transients result in dysregulation of multiple Ca2+-dependent processes and, through somewhat different pathways, in accelerated functional decline during aging and AD.
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Affiliation(s)
- Olivier Thibault
- Department of Molecular and Biomedical Pharmacology, University of Kentucky, University of Kentucky Medical Center, Lexington, KY 40536, USA
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Crépin A, Bidaux G, Vanden-Abeele F, Dewailly E, Goffin V, Prevarskaya N, Slomianny C. Prolactin stimulates prostate cell proliferation by increasing endoplasmic reticulum content due to SERCA 2b over-expression. Biochem J 2007; 401:49-55. [PMID: 16965263 PMCID: PMC1698681 DOI: 10.1042/bj20060870] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Prolactin (PRL) has been shown to be involved in the differentiation and proliferation of numerous tissues, including the prostate gland. Moreover, variations in [Ca2+]ER (calcium concentration within the endoplasmic reticulum) may play a role in cell growth. However, few studies have focused on the regulation of calcium homoeostasis by prolactin. The present study evaluates the regulation of calcium pools as well as the possible role of [Ca2+]ER variations as a signal for growth modulation by PRL. We show that PRL stimulates the proliferation of normal SV40 immortalized epithelial prostate (PNT1A) cells with a maximum effect at a dose of 100 ng/ml. We also show that 100 ng/ml PRL increases the [Ca2+]ER when measured either by indirect quantification with Fura-2AM after application of 1 mM thapsigargin or by direct quantification with Mag-Fura-2AM within the endoplas-mic reticulum. Western blot analysis shows that the SERCA 2b (sarcoendoplasmic calcium ATPase 2b) is over-expressed in PNT1A cells treated with 100 ng/ml PRL for 24 h. A small inter-fering RNA SERCA 2a/b, used to down-regulate endogenous SERCA 2b expression, reduced both PNT1A cell proliferation and [Ca2+]ER. We thus identify [Ca2+]ER and SERCA 2b as protagonists in PRL-induced proliferation.
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Affiliation(s)
- Alexandre Crépin
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
| | - Gabriel Bidaux
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
| | - Fabien Vanden-Abeele
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
| | - Etienne Dewailly
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
| | - Vincent Goffin
- †Inserm, U808, Faculté de Médecine Necker, Paris, F-75730, France; Université de Paris Descartes, Paris, F-75730, France
| | - Natalia Prevarskaya
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
| | - Christian Slomianny
- *Inserm, U800, Laboratoire de Physiologie Cellulaire, Équipe Labellisée par la Ligue Contre le Cancer, Villeneuve d'Ascq, F-59655 France; Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, F-59655 France
- To whom correspondence should be addressed (email )
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Korosec B, Glavac D, Rott T, Ravnik-Glavac M. Alterations in the ATP2A2 gene in correlation with colon and lung cancer. ACTA ACUST UNITED AC 2006; 171:105-11. [PMID: 17116488 DOI: 10.1016/j.cancergencyto.2006.06.016] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2006] [Revised: 06/23/2006] [Accepted: 06/27/2006] [Indexed: 11/22/2022]
Abstract
Sarcoendoplasmic reticulum calcium transport ATPases (SERCA-type calcium pumps), proteins that accumulate calcium in the endoplasmic reticulum, play an important role in numerous signaling pathways controlling tumor growth, differentiation, and cell death. Reports that Atp2a2 (Serca2) haploinsufficient mice often developed cancer prompted us to study the involvement of the ATP2A2 gene in human cancer development. We found 13 different novel alterations of the ATP2A2 gene in 27 of 416 alleles of patients with two different types of cancer. Changes in ATP2A2 were significantly more common in patients with colon cancer (P < 0.0001, odds ratio OR = 25.3) or lung cancer (P = 0.046, OR = 8.05). The 13 alterations were missense mutations (2), intronic deletions (2), intronic insertions (1), and single-nucleotide alterations (8: two in the coding region, three in the intronic region, and three in the promoter region). We detected lost or reduced expression of ATP2A2 in all patients with alterations in the promoter region, as well as in patients with a combination of gene alterations. Our results suggest that germline alterations of ATP2A2 may predispose to lung and colon cancer and that an impaired ATP2A2 gene might be involved, directly or indirectly, as an early event in carcinogenesis.
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Affiliation(s)
- Branka Korosec
- Department of Molecular Genetics, Institute of Pathology, Faculty of Medicine, University of Ljubljana, Korytkova 2, Ljubljana, Slovenia
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Prasad V, Boivin GP, Miller ML, Liu LH, Erwin CR, Warner BW, Shull GE. Haploinsufficiency of Atp2a2, Encoding the Sarco(endo)plasmic Reticulum Ca2+-ATPase Isoform 2 Ca2+ Pump, Predisposes Mice to Squamous Cell Tumors via a Novel Mode of Cancer Susceptibility. Cancer Res 2005; 65:8655-61. [PMID: 16204033 DOI: 10.1158/0008-5472.can-05-0026] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A null mutation in one copy of the Atp2a2 or ATP2A2 gene, encoding sarco(endo)plasmic reticulum Ca2+-ATPase isoform 2 (SERCA2), leads to squamous cell tumors in mice and to Darier disease in humans, a skin disorder that also involves keratinocytes. Here, we examined the time course and genetic mechanisms of tumor development in the mutant animals. Atp2a2+/- mice overexpressed keratins associated with keratinocyte hyperactivation in normal forestomachs as early as 2 months of age. By the age of 5 to 7 months, 22% of mutants had developed papillomas of the forestomach, and 89% of mutants older than 14 months had developed squamous cell papillomas and/or carcinomas, with a preponderance of the latter. Tumors occurred in regions that had keratinized epithelium and were subjected to repeated mechanical irritation. The genetic mechanism of tumorigenesis did not involve loss of heterozygosity, as tumor cells analyzed by laser capture microdissection contained the wild-type Atp2a2 allele. Furthermore, immunoblot and immunohistochemical analysis showed that tumor keratinocytes expressed the SERCA2 protein. Mutations were not observed in the ras proto-oncogenes; however, expression of wild-type ras was up-regulated, with particularly high levels of K-ras. Loss of the p53 tumor suppressor gene occurred in a single massive tumor, whereas other tumors had increased levels of p53 protein but no mutations in the p53 gene. These findings show that SERCA2 haploinsufficiency predisposes mice to tumor development via a novel mode of cancer susceptibility involving a global change in the tumorigenic potential of keratinized epithelium in Atp2a2+/- mice.
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Affiliation(s)
- Vikram Prasad
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0524, USA
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Sée V, Rajala NKM, Spiller DG, White MRH. Calcium-dependent regulation of the cell cycle via a novel MAPK--NF-kappaB pathway in Swiss 3T3 cells. ACTA ACUST UNITED AC 2004; 166:661-72. [PMID: 15326199 PMCID: PMC2172420 DOI: 10.1083/jcb.200402136] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Nuclear factor kappa B (NF-κB) has been implicated in the regulation of cell proliferation and transformation. We investigated the role of the serum-induced intracellular calcium increase in the NF-κB–dependent cell cycle progression in Swiss 3T3 fibroblasts. Noninvasive photoactivation of a calcium chelator (Diazo-2) was used to specifically disrupt the transient rise in calcium induced by serum stimulation of starved Swiss 3T3 cells. The serum-induced intracellular calcium peak was essential for subsequent NF-κB activation (measured by real-time imaging of the dynamic p65 and IκBα fluorescent fusion proteins), cyclin D1 (CD1) promoter-directed transcription (measured by real-time luminescence imaging of CD1 promoter-directed firefly luciferase activity), and progression to cell division. We further showed that the serum-induced mitogen-activated protein kinase (MAPK) phosphorylation is calcium dependent. Inhibition of the MAPK- but not the PtdIns3K-dependent pathway inhibited NF-κB signaling, and further, CD1 transcription and cell cycle progression. These data suggest that a serum-dependent calcium signal regulates the cell cycle via a MAPK–NF-κB pathway in Swiss 3T3 cells.
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Affiliation(s)
- Violaine Sée
- Centre for Cell Imaging, School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, England, UK
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12
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Modulation of Calcium Homeostasis by the Endoplasmic Reticulum in Health and Disease. CALRETICULIN 2003. [DOI: 10.1007/978-1-4419-9258-1_11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Lee YS, Jin DQ, Kwon EJ, Park SH, Lee ES, Jeong TC, Nam DH, Huh K, Kim JA. Asiatic acid, a triterpene, induces apoptosis through intracellular Ca2+ release and enhanced expression of p53 in HepG2 human hepatoma cells. Cancer Lett 2002; 186:83-91. [PMID: 12183079 DOI: 10.1016/s0304-3835(02)00260-4] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Asiatic acid (AA), a triterpene, decreased viability and induced apoptosis of HepG2 human hepatoma cells in a dose-dependent manner. AA also markedly increased intracellular Ca(2+) level, which was blocked by TMB-8 and dantrolene, intracellular Ca(2+) release blockers, but not by EGTA, an extracellular Ca(2+) chelator. Moreover, AA-induced apoptosis was significantly suppressed by treatment with TMB-8 and dantrolene, suggesting that intracellular Ca(2+) release may play an essential role in the AA-induced apoptosis. In addition, AA profoundly increased protein level of p53, which was also inhibited by BAPTA/AM, an intracellular Ca(2+) chelator, TMB-8 and dantrolene. Treatment with A23187, a Ca(2+) ionophore, or thapsigargin, a Ca(2+)-ATPase inhibitor, alone enhanced p53 nuclear accumulation, indicating that p53 accumulation is dependent on intracellular Ca(2+) increase. Furthermore, the viability of Hep3B, p53-null cells, was much higher than that of HepG2, p53-wild type cells, when treated with AA. Taken together, these results suggest that AA induced apoptosis through increased intracellular Ca(2+), which, in turn, enhanced p53 expression in HepG2 cells. These results further suggest that AA may be a valuable agent for the therapeutic intervention of human hepatomas.
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Affiliation(s)
- Yong Soo Lee
- College of Pharmacy, Duksung Women's University, Seoul 132-714, South Korea
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Abstract
Intracellular Ca(2+)-transport ATPases exert a pivotal role in the endoplasmic reticulum and in the compartments of the cellular secretory pathway by maintaining a sufficiently high lumenal Ca(2+) (and Mn(2+)) concentration in these compartments required for an impressive number of vastly different cell functions. At the same time this lumenal Ca(2+) represents a store of releasable activator Ca(2+) controlling an equally impressive number of cytosolic functions. This review mainly focuses on the different Ca(2+)-transport ATPases found in the intracellular compartments of mainly animal non-muscle cells: the sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA) pumps. Although it is not our intention to treat the ATPases of the specialized sarcoplasmic reticulum in depth, we can hardly ignore the SERCA1 pump of fast-twitch skeletal muscle since its structure and function is by far the best understood and it can serve as a guide to understand the other members of the family. In a second part of this review we describe the relatively novel family of secretory pathway Ca(2+)/Mn(2+) ATPases (SPCA), which in eukaryotic cells are primarily found in the Golgi compartment.
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Affiliation(s)
- F Wuytack
- Laboratorium voor Fysiologie, K.U.Leuven, Campus Gasthuisberg, Leuven, Belgium.
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15
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Legrand G, Humez S, Slomianny C, Dewailly E, Vanden Abeele F, Mariot P, Wuytack F, Prevarskaya N. Ca2+ pools and cell growth. Evidence for sarcoendoplasmic Ca2+-ATPases 2B involvement in human prostate cancer cell growth control. J Biol Chem 2001; 276:47608-14. [PMID: 11606580 DOI: 10.1074/jbc.m107011200] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The present study demonstrates for the first time that intracellular calcium-ATPases and calcium pool content are closely associated with prostate cancer LNCaP cell growth. Cell growth was modulated by changing the amount of epidermal growth factor, serum, and androgene in culture media. Using the microspectrofluorimetric method with Fura-2 and Mag Fura-2 as probes, we show that in these cells, the growth rate is correlated with intracellular calcium pool content. Indeed, an increased growth rate is correlated with an increase in the calcium pool filling state, whereas growth-inhibited cells show a reduced calcium pool load. Using Western blotting and immunocytochemistry, we show that endoplasmic reticulum calcium pump expression is closely linked to LNCaP cell growth, and are a common target of physiological stimuli that control cell growth. Moreover, we clearly demonstrate that inhibition of these pumps, using thapsigargin, inhibits LNCaP cell growth and prevents growth factor from stimulating cell proliferation. Our results thus provide evidence for the essential role of functional endoplasmic reticulum calcium pumps and calcium pool in control of prostate cancer LNCaP cell growth, raising the prospect of new targets for the treatment of prostate cancer.
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Affiliation(s)
- G Legrand
- Laboratoire de Physiologie Cellulaire, INSERM EPI-9938, USTL, Bat. SN3, 59655 Villeneuve d'Ascq Cedex, France.
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16
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Liu LH, Boivin GP, Prasad V, Periasamy M, Shull GE. Squamous cell tumors in mice heterozygous for a null allele of Atp2a2, encoding the sarco(endo)plasmic reticulum Ca2+-ATPase isoform 2 Ca2+ pump. J Biol Chem 2001; 276:26737-40. [PMID: 11389134 DOI: 10.1074/jbc.c100275200] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mutations in the human ATP2A2 gene, encoding sarco(endo)plasmic reticulum Ca(2+)-ATPase isoform 2 (SERCA2), cause Darier disease, an autosomal dominant skin disease characterized by multiple keratotic papules in the seborrheic regions of the body. Mice with a single functional Atp2a2 allele (the mouse homolog of ATP2A2) were shown previously to have reduced levels of SERCA2 in heart and mildly impaired cardiac contractility and relaxation. Here we show that aged heterozygous mutant (Atp2a2(+/-)) mice develop squamous cell tumors of the forestomach, esophagus, oral mucosa, tongue, and skin. Squamous cell tumors occurred in 13/14 Atp2a2(+/-) mice but were not observed in age- and sex-matched wild-type controls. Hyperkeratinized squamous cell papillomas and carcinomas of the upper digestive tract were the most frequent finding among Atp2a2(+/-) mice, and many animals had multiple tumors. Western blot analyses showed that SERCA2 protein levels were reduced in skin and other affected tissues of heterozygous mice. The development of squamous cell tumors in aged Atp2a2(+/-) mice indicates that SERCA2 haploinsufficiency predisposes murine keratinocytes to neoplasia. These findings provide the first direct demonstration that a perturbation of Ca(2+) homeostasis or signaling can serve as a primary initiating event in cancer.
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Affiliation(s)
- L H Liu
- Departments of Molecular Genetics, Biochemistry and Microbiology and Pathology and Laboratory Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, USA
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17
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Cecchi C, Liguri G, Pieri A, Degl'Innocenti D, Nediani C, Fiorillo C, Nassi P, Ramponi G. Interaction between acylphosphatase and SERCA in SH-SY5Y cells. Mol Cell Biochem 2000; 211:95-102. [PMID: 11055552 DOI: 10.1023/a:1007162717292] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Ca2+ transport by sarco/endoplasmic reticulum, tightly coupled with the enzymatic activity of Ca2+ -dependent ATPase, controls the cell cycle through the regulation of genes operating in the critical G, to S checkpoint. Experimental studies demonstrated that acylphosphatase actively hydrolyses the phosphorylated intermediate of sarco/endoplasmic reticulum calcium ATPase (SERCA) and therefore enhances the activity of Ca2+ pump. In this study we found that SH-SY5Y neuroblastoma cell division was blocked by entry into a quiescent G0-like state by thapsigargin, a high specific SERCA inhibitor, highlighting the regulatory role of SERCA in cell cycle progression. Addition of physiological amounts of acylphosphatase to SY5Y membranes resulted in a significant increase in the rate of ATP hydrolysis of SERCA. In synchronized cells a concomitant variation of the level of acylphosphatase isoenzymes opposite to that of intracellular free calcium during the G1 and S phases occurs. Particularly, during G1 phase progression the isoenzymes content declined steadily and hit the lowest level after 6 h from G0 to G1 transition with a concomitant significant increase of calcium levels. No changes in free calcium and acylphosphatase levels upon thapsigargin inhibition were observed. Moreover, a specific binding between acylphosphatase and SERCA was demonstrated. No significant change in SERCA-2 expression was found. These findings suggest that the hydrolytic activity of acylphosphatase increase the turnover of the phosphoenzyme intermediate with the consequences of an enhanced efficiency of calcium transport across endoplasmic reticulum and a subsequent decrease in cytoplasmic calcium levels. A hypothesis about the modulation of SERCA activity by acylphosphatase during cell cycle in SY5Y cells in discussed.
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Affiliation(s)
- C Cecchi
- Department of Biochemical Sciences, University of Florence, Italy
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18
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Abramowitz J, Aydemir-Koksoy A, Helgason T, Jemelka S, Odebunmi T, Seidel CL, Allen JC. Expression of plasma membrane calcium ATPases in phenotypically distinct canine vascular smooth muscle cells. J Mol Cell Cardiol 2000; 32:777-89. [PMID: 10775483 DOI: 10.1006/jmcc.2000.1120] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Our laboratory has identified at least two types of vascular smooth muscle cells (VSMCs) that exist in canine arteries and veins: type 1 cells, located in the media express muscle specific proteins but do not proliferate in culture; and type 2 cells, located in both media and adventitia, do not express muscle specific protein but proliferate in culture. Plasma membrane Ca(2+)-ATPases (PMCAs) have been implicated in proliferation control. The present study examines the expression of PMCA isoforms and calmodulin-binding domain splice variants in these two types of canine VSMCs. PMCA protein was found in both type 1 and type 2 cells. Reverse transcriptase-polymerase chain reaction assays were developed for canine PMCA calmodulin-binding domain splice variants. We cloned and sequenced isolates corresponding to PMCA1b, 4a and 4b from canine VSMCs. PMCA 2 and 3 were not detected. Freshly isolated type 1 cells expressed PMCA 1b, 4a and 4b, while freshly isolated type 2 cells expressed PMCA1b and 4b. Upon placement in culture, type 2 cells originating from either carotid artery or saphenous vein demonstrated a time-dependent upregulation of PMCA4a mRNA. Treatment with the phosphoinositide 3-kinase inhibitor wortmannin produced concentration-dependent inhibition of both PMCA4a upregulation and [(3)H]thymidine incorporation. These findings suggest a role for phosphoinositide 3-kinase in regulating PMCA expression, which may be important in the control of Ca(2+)-sensitive VSMC functions.
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Affiliation(s)
- J Abramowitz
- Department of Medicine (Cardiovascular Sciences), Baylor College of Medicine, Houston, Texas, 77030, USA.
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19
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Kuo TH, Liu BF, Yu Y, Wuytack F, Raeymaekers L, Tsang W. Co-ordinated regulation of the plasma membrane calcium pump and the sarco(endo)plasmic reticular calcium pump gene expression by Ca2+. Cell Calcium 1997; 21:399-408. [PMID: 9223676 DOI: 10.1016/s0143-4160(97)90051-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The plasma membrane calcium pump (PMCA) and sarco(endo)plasmic reticular calcium pump (SERCA) are important components of the Ca2+ homeostasis system responsible for intracellular Ca2+ signaling, yet the factors which govern their expression remain unclear. Recently, we have found that overexpression of PMCA by a gene transfection approach caused a down-regulation of the SERCA pump [Liu B.F., Xu X., Fridman R., Muallem S., Kuo T.H. Consequences of functional expression of the plasma membrane calcium pump isoform 1a. J Biol Chem 1996; 271: 5536-5544]. The results suggest an interdependence between PMCA and SERCA gene expression which has prompted us to investigate further on the mechanisms that regulate the expression of these Ca2+ pump genes in various cultured cell lines. In the present study, we have analyzed the isoforms of the PMCA and SERCA in different cells and presented evidence in favor of a co-induction of the PMCA and SERCA gene expression by second messengers, such as protein kinase C, cAMP, and Ca2+. Ectopic expression of PMCA or SERCA led to downregulation of the endogenous forms of both pumps. Changes in the level of mRNAs were paralleled by corresponding altered pump protein contents. The Ca(2+)-mediated increase of gene expression is accompanied by increased transcription rates as indicated by nuclear run-on assay. The co-ordinated induction of the PMCA and SERCA gene expression by thapsigargin was not blocked by the cytosolic application of the Ca2+ chelator BAPTA. We conclude that genes encoding components of the major Ca2+ transport pathways, including pumps and IP3 receptor channels, are regulatorally linked and this link is provided by the Ca2+ load of the ER store. This study points to the importance of gene expression as an integral component in the regulation of cellular Ca2+ homeostasis.
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Affiliation(s)
- T H Kuo
- Department of Pathology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
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20
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Launay S, Bobe R, Lacabaratz-Porret C, Bredoux R, Kovàcs T, Enouf J, Papp B. Modulation of endoplasmic reticulum calcium pump expression during T lymphocyte activation. J Biol Chem 1997; 272:10746-50. [PMID: 9099725 DOI: 10.1074/jbc.272.16.10746] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Calcium mobilization from intracellular storage organelles is a key component of the second messenger system inducing cell activation. Calcium transport ATPases associated with intracellular calcium storage organelles play a major role in controlling this process by accumulating calcium from the cytosol into intracellular calcium pools. In this study the modulation of the expression of the sarco-endoplasmic reticulum calcium transport ATPase (SERCA) isoenzymes has been studied in lymphocytes undergoing phorbol myristate acetate and ionomycin-induced activation. In several T lymphocyte cell lines a combined treatment by the two drugs resulted in an approximately 90% decrease of the expression of the calcium pump isoform recognized by the PLIM430 isoform-specific antibody, whereas the expression of the SERCA 2b isoform was increased approximately 2-fold. Phorbol ester or ionomycin applied separately was ineffective. In Jurkat T cells the down-modulation of expression of the SERCA isoform recognized by the PLIM430 antibody appeared concomitantly with the induction of interleukin-2 expression and could be inhibited by the immunosuppressant drug cyclosporine-A. These data indicate that T cell activation induces a selective and cyclosporine-A-sensitive modulation of the expression of the SERCA calcium pump isoforms. This reflects a profound reorganization of the calcium homeostasis of T cells undergoing activation and may open new avenues in the understanding of the plasticity of the calcium homeostasis of differentiating cells and in the pharmacological modulation of lymphocyte function.
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Affiliation(s)
- S Launay
- U348 INSERM, Institut Fédératif de Recherche Circulation Lariboisière, Hôpital Lariboisière, 8, rue Guy Patin, 75475 Paris Cedex 10, France
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