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Darier disease: first molecular study of a Portuguese family. Heliyon 2019; 5:e02520. [PMID: 31687605 PMCID: PMC6819764 DOI: 10.1016/j.heliyon.2019.e02520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 05/26/2019] [Accepted: 09/23/2019] [Indexed: 11/22/2022] Open
Abstract
Background Darier disease (DD) is a rare autosomal dominant condition characterized by skin lesions. Additionally, a wide range of neuropsychiatric symptoms is frequently reported in DD patients. This genodermatosis relies on mutations in the ATPase sarcoplasmic/endoplasmic reticulum Ca2+ transporting 2 (ATP2A2) gene, which encodes an ATPase responsible for pumping Ca2+ from the cytosol to the lumen of the ER. Objective Herein we studied the molecular aspect of a two-generation Portuguese family with DD history with clinical variability. Methods All exons and intron-exon borders of genomic ATP2A2, as well as coding ATP2A2, were sequenced. Relative levels of SERCA2 mRNA and protein were quantified by qPCR and western blotting, respectively. Results The c.1287+1G > T variant was identified in all affected individuals, whereas the unaffected individual was shown to carry the wild-type ATP2A2 sequence in both alleles. This variant leads to the skipping of full exon 10, which consequently generates a frameshift originating a premature STOP codon in exon 11 (p.V395 = fs*19). Although the mutant mRNA seems to partially escape degradation, results suggest synthesis inhibition or immediate degradation of the mutant protein. Neuropsychiatric and other occurrences affecting certain patients are also reported. Conclusion This is the first study of DD in Portugal, the variant identified, previously described in a single Japanese patient, may be considered a pathogenic mutation, and haploinsufficiency the mechanism underlying DD pathology in these patients. This study also highlights the co-occurrence of neuropsychiatric features in DD.
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2
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Mikkelsen SA, Vangheluwe P, Andersen JP. A Darier disease mutation relieves kinetic constraints imposed by the tail of sarco(endo)plasmic reticulum Ca 2+-ATPase 2b. J Biol Chem 2018; 293:3880-3889. [PMID: 29363575 DOI: 10.1074/jbc.ra117.000941] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 01/19/2018] [Indexed: 11/06/2022] Open
Abstract
The sarco(endo)plasmic reticulum Ca2+-ATPase (SERCA) 2b isoform possesses an extended C terminus (SERCA2b tail) forming an 11th transmembrane (TM) helix, which slows conformational changes of the Ca2+-pump reaction cycle. Here, we report that a Darier disease (DD) mutation of SERCA2b that changes a glutamate to a lysine in the cytoplasmic loop between TM8 and TM9 (E917K) relieves these kinetic constraints. We analyzed the effects of this mutation on the overall reaction and the individual partial reactions of the Ca2+ pump compared with the corresponding mutations of the SERCA2a and SERCA1a isoforms, lacking the SERCA2b tail. In addition to a reduced affinity for Ca2+, caused by the mutation in all three isoforms examined, we observed a unique enhancing effect on the turnover rates of ATPase activity and Ca2+ transport for the SERCA2b E917K mutation. This relief of kinetic constraints contrasted with inhibitory effects observed for the corresponding SERCA2a and SERCA1a (E918K) mutations. These observations indicated that the E917K/E918K mutations affect the rate-limiting conformational change in isoform-specific ways and that the SERCA2b mutation perturbs the interactions of TM11 with other SERCA2b regions. Mutational analysis of an arginine in TM7 that interacts with the glutamate in SERCA1a crystal structures suggested that in wildtype SERCA2b, the corresponding arginine (Arg-835) may be involved in mediating the conformational restriction by TM11. Moreover, the E917K mutation may disturb TM11 through the cytoplasmic loop between TM10 and TM11. In conclusion, our findings have identified structural elements of importance for the kinetic constraints imposed by TM11.
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Affiliation(s)
- Stine A Mikkelsen
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark and
| | - Peter Vangheluwe
- the Department of Cellular and Molecular Medicine, KU Leuven, B-3000 Leuven, Belgium
| | - Jens Peter Andersen
- From the Department of Biomedicine, Aarhus University, DK-8000 Aarhus C, Denmark and
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3
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Espinoza-Fonseca LM. The Ca 2+-ATPase pump facilitates bidirectional proton transport across the sarco/endoplasmic reticulum. MOLECULAR BIOSYSTEMS 2017; 13:633-637. [PMID: 28290590 DOI: 10.1039/c7mb00065k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Ca2+ transport across the sarco/endoplasmic reticulum (SR) plays an essential role in intracellular Ca2+ homeostasis, signalling, cell differentiation and muscle contractility. During SR Ca2+ uptake and release, proton fluxes are required to balance the charge deficit generated by the exchange of Ca2+ and other ions across the SR. During Ca2+ uptake by the SR Ca2+-ATPase (SERCA), two protons are countertransported from the SR lumen to the cytosol, thus partially compensating for the charge moved by Ca2+ transport. Studies have shown that protons are also transported from the cytosol to the lumen during Ca2+ release, but a transporter that facilitates proton transport into the SR lumen has not been described. In this article we propose that SERCA forms pores that facilitate bidirectional proton transport across the SR. We describe the location and structure of water-filled pores in SERCA that form cytosolic and luminal pathways for protons to cross the SR membrane. Based on this structural information, we suggest mechanistic models for proton translocation to the cytosol during active Ca2+ transport, and into the SR lumen during SERCA inhibition by endogenous regulatory proteins. Finally, we discuss the physiological consequences of SERCA-mediated bidirectional proton transport across the SR membrane of muscle and non-muscle cells.
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Affiliation(s)
- L Michel Espinoza-Fonseca
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
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4
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Ahmad I, Muneer KM, Chang ME, Nasr HM, Clay JM, Huang CC, Yusuf N. Ultraviolet Radiation‐Induced Downregulation of SERCA2 Mediates Activation of NLRP3 Inflammasome in Basal Cell Carcinoma. Photochem Photobiol 2017; 93:1025-1033. [DOI: 10.1111/php.12725] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 11/26/2016] [Indexed: 02/03/2023]
Affiliation(s)
- Israr Ahmad
- Department of Dermatology Skin Diseases Research Center Birmingham AL
| | - Kashiff M. Muneer
- Department of Dermatology Skin Diseases Research Center Birmingham AL
| | - Michelle E. Chang
- Department of Dermatology Skin Diseases Research Center Birmingham AL
| | - Hana M. Nasr
- Department of Dermatology Skin Diseases Research Center Birmingham AL
| | | | - Conway C. Huang
- Department of Dermatology Skin Diseases Research Center Birmingham AL
| | - Nabiha Yusuf
- Department of Dermatology Skin Diseases Research Center Birmingham AL
- Veteran Affairs Medical Center Birmingham AL
- Comprehensive Cancer Center University of Alabama Birmingham AL
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5
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Li N, Park M, Xiao S, Liu Z, Diaz LA. ER-to-Golgi blockade of nascent desmosomal cadherins in SERCA2-inhibited keratinocytes: Implications for Darier's disease. Traffic 2017; 18:232-241. [PMID: 28156030 DOI: 10.1111/tra.12470] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 01/30/2017] [Indexed: 12/26/2022]
Abstract
Darier's disease (DD) is an autosomal dominantly inherited skin disorder caused by mutations in sarco/endoplasmic reticulum Ca2+ -ATPase 2 (SERCA2), a Ca2+ pump that transports Ca2+ from the cytosol to the endoplasmic reticulum (ER). Loss of desmosomes and keratinocyte cohesion is a characteristic feature of DD. Desmosomal cadherins (DC) are Ca2+ -dependent transmembrane adhesion proteins of desmosomes, which are mislocalized in the lesional but not perilesional skin of DD. We show here that inhibition of SERCA2 by 2 distinct inhibitors results in accumulation of DC precursors in keratinocytes, indicating ER-to-Golgi transport of nascent DC is blocked. Partial loss of SERCA2 by siRNA has no such effect, implicating that haploinsufficiency is not sufficient to affect nascent DC maturation. However, a synergistic effect is revealed between SERCA2 siRNA and an ineffective dose of SERCA2 inhibitor, and between an agonist of the ER Ca2+ release channel and SERCA2 inhibitor. These results suggest that reduction of ER Ca2+ below a critical level causes ER retention of nascent DC. Moreover, colocalization of DC with ER calnexin is detected in SERCA2-inhibited keratinocytes and DD epidermis. Collectively, our data demonstrate that loss of SERCA2 impairs ER-to-Golgi transport of nascent DC, which may contribute to DD pathogenesis.
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Affiliation(s)
- Ning Li
- Department of Dermatology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Moonhee Park
- Department of Dermatology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Shengxiang Xiao
- Department of Dermatology, The Second Hospital, Xi-An Jiaotong University, People's Republic of China
| | - Zhi Liu
- Department of Dermatology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Luis A Diaz
- Department of Dermatology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
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6
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Antaloae AV, Montigny C, le Maire M, Watson KA, Sørensen TLM. Optimisation of recombinant production of active human cardiac SERCA2a ATPase. PLoS One 2013; 8:e71842. [PMID: 23951256 PMCID: PMC3741278 DOI: 10.1371/journal.pone.0071842] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 07/03/2013] [Indexed: 12/16/2022] Open
Abstract
Methods for recombinant production of eukaryotic membrane proteins, yielding sufficient quantity and quality of protein for structural biology, remain a challenge. We describe here, expression and purification optimisation of the human SERCA2a cardiac isoform of Ca(2+) translocating ATPase, using Saccharomyces cerevisiae as the heterologous expression system of choice. Two different expression vectors were utilised, allowing expression of C-terminal fusion proteins with a biotinylation domain or a GFP- His8 tag. Solubilised membrane fractions containing the protein of interest were purified onto Streptavidin-Sepharose, Ni-NTA or Talon resin, depending on the fusion tag present. Biotinylated protein was detected using specific antibody directed against SERCA2 and, advantageously, GFP-His8 fusion protein was easily traced during the purification steps using in-gel fluorescence. Importantly, talon resin affinity purification proved more specific than Ni-NTA resin for the GFP-His8 tagged protein, providing better separation of oligomers present, during size exclusion chromatography. The optimised method for expression and purification of human cardiac SERCA2a reported herein, yields purified protein (> 90%) that displays a calcium-dependent thapsigargin-sensitive activity and is suitable for further biophysical, structural and physiological studies. This work provides support for the use of Saccharomyces cerevisiae as a suitable expression system for recombinant production of multi-domain eukaryotic membrane proteins.
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Affiliation(s)
- Ana V. Antaloae
- School of Biological Sciences, Whiteknights Campus, University of Reading, Reading, Berkshire, United Kingdom
| | - Cédric Montigny
- CEA, iBiTec-S, CNRS, UMR 8221, Universite Paris-Sud, Saclay, France
| | - Marc le Maire
- CEA, iBiTec-S, CNRS, UMR 8221, Universite Paris-Sud, Saclay, France
| | - Kimberly A. Watson
- School of Biological Sciences, Whiteknights Campus, University of Reading, Reading, Berkshire, United Kingdom
- * E-mail: (KAW); (TL-MS)
| | - Thomas L.-M. Sørensen
- Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, United Kingdom
- * E-mail: (KAW); (TL-MS)
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7
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Marks AR. Calcium cycling proteins and heart failure: mechanisms and therapeutics. J Clin Invest 2013; 123:46-52. [PMID: 23281409 DOI: 10.1172/jci62834] [Citation(s) in RCA: 275] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Ca2+-dependent signaling is highly regulated in cardiomyocytes and determines the force of cardiac muscle contraction. Ca2+ cycling refers to the release and reuptake of intracellular Ca2+ that drives muscle contraction and relaxation. In failing hearts, Ca2+ cycling is profoundly altered, resulting in impaired contractility and fatal cardiac arrhythmias. The key defects in Ca2+ cycling occur at the level of the sarcoplasmic reticulum (SR), a Ca2+ storage organelle in muscle. Defects in the regulation of Ca2+ cycling proteins including the ryanodine receptor 2, cardiac (RyR2)/Ca2+ release channel macromolecular complexes and the sarcoplasmic/endoplasmic reticulum Ca2+ ATPase 2a (SERCA2a)/phospholamban complex contribute to heart failure. RyR2s are oxidized, nitrosylated, and PKA hyperphosphorylated, resulting in "leaky" channels in failing hearts. These leaky RyR2s contribute to depletion of Ca2+ from the SR, and the leaking Ca2+ depolarizes cardiomyocytes and triggers fatal arrhythmias. SERCA2a is downregulated and phospholamban is hypophosphorylated in failing hearts, resulting in impaired SR Ca2+ reuptake that conspires with leaky RyR2 to deplete SR Ca2+. Two new therapeutic strategies for heart failure (HF) are now being tested in clinical trials: (a) fixing the leak in RyR2 channels with a novel class of Ca2+-release channel stabilizers called Rycals and (b) increasing expression of SERCA2a to improve SR Ca2+ reuptake with viral-mediated gene therapy. There are many potential opportunities for additional mechanism-based therapeutics involving the machinery that regulates Ca2+ cycling in the heart.
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Affiliation(s)
- Andrew R Marks
- Department of Physiology and Cellular Biophysics and The Clyde and Helen Wu Center for Molecular Cardiology, College of Physicians and Surgeons of Columbia University, New York, New York 10032, USA.
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8
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Tissue-specific expression of Sarcoplasmic/Endoplasmic Reticulum Calcium ATPases (ATP2A/SERCA) 1, 2, 3 during Xenopus laevis development. Gene Expr Patterns 2011; 11:122-8. [DOI: 10.1016/j.gep.2010.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 10/12/2010] [Accepted: 10/22/2010] [Indexed: 12/13/2022]
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9
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Savignac M, Edir A, Simon M, Hovnanian A. Darier disease : a disease model of impaired calcium homeostasis in the skin. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2010; 1813:1111-7. [PMID: 21167218 DOI: 10.1016/j.bbamcr.2010.12.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Revised: 12/03/2010] [Accepted: 12/04/2010] [Indexed: 12/29/2022]
Abstract
The importance of extracellular calcium in epidermal differentiation and intra-epidermal cohesion has been recognized for many years. Darier disease (DD) was the first genetic skin disease caused by abnormal epidermal calcium homeostasis to be identified. DD is characterized by loss of cell-to-cell adhesion and abnormal keratinization. DD is caused by genetic defects in ATP2A2 encoding the sarco/endoplasmic reticulum Ca(2+)-ATPase isoform 2 (SERCA2). SERCA2 is a calcium pump of the endoplasmic reticulum (ER) transporting Ca(2+) from the cytosol to the lumen of ER. ATP2A2 mutations lead to loss of Ca(2+) transport by SERCA2 resulting in decreased ER Ca(2+) concentration in Darier keratinocytes. Here, we review the role of SERCA2 pumps and calcium in normal epidermis, and we discuss the consequences of ATP2A2 mutations on Ca(2+) signaling in DD. This article is part of a Special Issue entitled: 11th European Symposium on Calcium.
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10
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Kaliyadan F, Manoj J, Venkitakrishnan S. Acrokeratosis verruciformis of hopf associated with dilated cardiomyopathy. Indian J Dermatol 2010; 54:296-7. [PMID: 20161869 PMCID: PMC2810704 DOI: 10.4103/0019-5154.55647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- Feroze Kaliyadan
- Department of Dermatology, Amrita Institute of Medical Sciences, Kochi, Kerala - 682 026, India. E-mail:
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11
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Lompré AM, Hajjar RJ, Harding SE, Kranias EG, Lohse MJ, Marks AR. Ca2+ cycling and new therapeutic approaches for heart failure. Circulation 2010; 121:822-30. [PMID: 20124124 DOI: 10.1161/circulationaha.109.890954] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Anne-Marie Lompré
- INSERM UMRS956/Université Pierre et Marie Curie, Faculté de Médecine, 91 Boulevard de l'Hôpital, 75013 Paris, France.
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12
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Role of sarco/endoplasmic reticulum calcium content and calcium ATPase activity in the control of cell growth and proliferation. Pflugers Arch 2008; 457:673-85. [PMID: 18188588 DOI: 10.1007/s00424-007-0428-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Accepted: 12/11/2007] [Indexed: 12/11/2022]
Abstract
Ca(2+), the main second messenger, is central to the regulation of cellular growth. There is increasing evidence that cellular growth and proliferation are supported by a continuous store-operated Ca(2+) influx. By controlling store refilling, the sarco/endoplasmic reticulum Ca(2+) ATPase (SERCA) also controls store-operated calcium entry and, thus, cell growth. In this review, we discuss data showing the involvement of SERCA in the regulation of proliferation and hypertrophy. First, we describe the Ca(2+)-related signaling pathways involved in cell growth. Then, we present evidence that SERCA controls proliferation of differentiated cells and hypertrophic growth of cardiomyocytes, and discuss the role of SERCA isoforms. Last, we consider the potential therapeutic applications of increasing SERCA activity for the treatment of cardiovascular diseases and of modulating SERCA and SR content for the treatment of cancer.
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13
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Abstract
Sarco(endo)plasmic reticulum (SER) Ca2+ ATPases represent a highly conserved family of Ca2+ pumps which actively transport Ca2+ from the cytosol to the SER against a large concentration gradient. In humans, 3 genes (ATP2A1-3) generate multiple isoforms (SERCAla,b, SERCA2a-c, SECA3a-f) by developmental or tissue-specific alternative splicing. These pumps differ by their regulatory and kinetic properties, allowing for optimized function in the tissue where they are expressed. They play a central role in calcium signalling through regenerating SER Ca2+ stores, maintaining appropriate Ca2+ levels in this organelle and shaping cytosolic and nuclear Ca2+ variations which govern cell response. Defects in ATP2A1 encoding SERCA1 cause recessive Brody myopathy, mutations in ATP2A2 coding for SERCA2 underlie a dominant skin disease, Darier disease and its clinical variants. SERCA2a expression is reduced in heart failure in human and in mice models. Gene-targeting studies in mouse confirmed the expected function of these isoforms in some cases, but also resulted in unexpected phenotypes: SERCA1 null mutants die from respiratory failure, SERCA2 heterozygous mutant mice develop skin cancer with age and SERCA3 null mice display no diabetes. These unique phenotypes have provided invaluable information on the role of these pumps in specific tissues and species, and have improved our understanding of Ca2+ regulated processes in muscles, the heart and the skin in human and in mice. Although the understanding of the pathogenesis of these diseases is still incomplete, these recent advances hold the promise of improved knowledge on the disease processes and the identification of new targets for therapeutic interventions.
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Süle N, Tészás A, Kálmán E, Szigeti R, Miseta A, Kellermayer R. Lithium suppresses epidermal SERCA2 and PMR1 levels in the rat. Pathol Oncol Res 2006; 12:234-6. [PMID: 17189987 DOI: 10.1007/bf02893419] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2006] [Accepted: 10/21/2006] [Indexed: 10/21/2022]
Abstract
Autosomal dominant mutations in the genes encoding the calcium ATPases SERCA2 and PMRI/SPCA1 cause the genodermatoses Darier disease (DD) and Hailey-Hailey disease (HHD), respectively. Recent observations indicated that the level of the pathogenic proteins greatly decreases in the affected areas of the epidermis in these disorders. Here we addressed how lithium, a recognized exacerbating factor in Darier disease, affects the epidermal expression of SERCA2 and PMR1/SPCA1 in the rat as a model. Standard histologic and immunohistochemical methods were utilized in 3 lithium-treated and 3 control animals. A significant suppression of epidermal SERCA2 and PMR1 levels were observed as a result of lithium therapy in addition to marked qualitative and quantitative changes in the stratum corneum and the granular layer of the epidermis in the treated animals. Our findings suggest that exacerbating factors in calcium ATPase disorders of the skin suppress epidermal SERCA2 and PMR1 levels, further decreasing the already haploinsufficient protein expression to a potentially critical level in Darier disease and Hailey-Hailey disease, respectively. Lithium therapy should specifically be avoided not only in Darier disease, but Hailey-Hailey disease as well.
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Affiliation(s)
- Norbert Süle
- Department of Pathology, University of Pécs, Pécs, Hungary
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Frezzini C, Cedro M, Leao JC, Porter S. Darier disease affecting the gingival and oral mucosal surfaces. ACTA ACUST UNITED AC 2006; 102:e29-33. [PMID: 16997091 DOI: 10.1016/j.tripleo.2005.10.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2005] [Revised: 07/02/2005] [Accepted: 10/12/2005] [Indexed: 11/21/2022]
Abstract
Darier disease is an uncommon genodermatosis reflecting defective desmosomal structure and function. The present report details the oral features of a patient with well-characterized Darier disease and reviews current knowledge of the genetic basis of this genodermatosis that can often affect the craniofacial tissues.
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Affiliation(s)
- Cristina Frezzini
- Division of Maxillofacial Diagnostic, Medical and Surgical Sciences, Eastman Dental Institute for Oral Health Care Sciences, University College London, London, UK
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Pani B, Cornatzer E, Cornatzer W, Shin DM, Pittelkow MR, Hovnanian A, Ambudkar IS, Singh BB. Up-regulation of transient receptor potential canonical 1 (TRPC1) following sarco(endo)plasmic reticulum Ca2+ ATPase 2 gene silencing promotes cell survival: a potential role for TRPC1 in Darier's disease. Mol Biol Cell 2006; 17:4446-58. [PMID: 16899508 PMCID: PMC1635355 DOI: 10.1091/mbc.e06-03-0251] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The mechanism(s) involved in regulation of store operated calcium entry in Darier's disease (DD) is not known. We investigated the distribution and function of transient receptor potential canonical (TRPC) in epidermal skin cells. DD patients demonstrated up-regulation of TRPC1, but not TRPC3, in the squamous layers. Ca2+ influx was significantly higher in keratinocytes obtained from DD patients and showed enhanced proliferation compared with normal keratinocytes. Similar up-regulation of TRPC1 was also detected in epidermal layers of SERCA2+/- mice. HaCaT cells expressed TRPC1 in the plasma membrane. Expression of sarco(endo)plasmic reticulum Ca2+ ATPase (SERCA)2 small interfering RNA (siRNA) in HaCaT cells increased TRPC1 levels and thapsigargin-stimulated Ca2+ influx, which was blocked by store-operated calcium entry inhibitors. Thapsigargin-stimulated intracellular Ca2+ release was decreased in DD cells. DD keratinocytes exhibited increased cell survival upon thapsigargin treatment. Alternatively, overexpression of TRPC1 or SERCA2-siRNA in HaCaT cells demonstrated resistance to thapsigargin-induced apoptosis. These effects were dependent on external Ca2+ and activation of nuclear factor-kappaB. Isotretinoin reduced Ca2+ entry in HaCaT cells and decreased survival of HaCaT and DD keratinocytes. These findings put forward a novel consequence of compromised SERCA2 function in DD wherein up-regulation of TRPC1 augments cell proliferation and restrict apoptosis. We suggest that the anti-apoptotic effect of TRPC1 could potentially contribute to abnormal keratosis in DD.
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Affiliation(s)
| | | | - William Cornatzer
- Internal Medicine, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, ND 58202
| | - Dong-Min Shin
- Department of Oral Biology, Korea 21 Project for Medical Science, Yonsei University College of Dentistry, Seoul 120-752, Korea
| | - Mark R. Pittelkow
- Department of Dermatology, Mayo Clinic College of Medicine, Rochester, MN 55905
| | - Alain Hovnanian
- Department of Functional Genetics of Epithelial Diseases, Institut National de la Santé et de la Recherche Médicale U563, 31024 Toulouse Cedex 3, France; and
| | - Indu S. Ambudkar
- Secretory Physiology Section, Gene Therapy and Therapeutics Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892
| | - Brij B. Singh
- Departments of *Biochemistry and Molecular Biology and
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Abstract
Darier disease (DD) and Hailey-Hailey disease (HHD) are the only known autosomal-dominant Ca2+ ATPase disorders. Epidermal symptoms selectively occur in the affected individuals, the precise reason for which is still not fully understood. Here, we review the clinical, epidermal, and molecular features of the two genodermatoses. It is concluded that epidermal Ca2+ regulation disturbances and epigenetic factors may play an even more prominent role in the pathogenesis of DD and HHD than earlier appreciated.
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Affiliation(s)
- Réka Szigeti
- 1Department of Dermatology, University of Pécs, Pécs, Hungary
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18
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Krizaj D. Serca isoform expression in the mammalian retina. Exp Eye Res 2005; 81:690-9. [PMID: 15967430 PMCID: PMC2921800 DOI: 10.1016/j.exer.2005.04.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2005] [Revised: 03/24/2005] [Accepted: 04/18/2005] [Indexed: 11/26/2022]
Abstract
The sarcoplasmic-endoplasmic reticulum calcium ATPase (SERCA) is a key intracellular calcium transporter, which regulates cellular calcium concentration [Ca2+] by transporting Ca2+ ions from the cytosol into the endoplasmic reticulum. SERCA-mediated Ca2+ sequestration controls proper folding of newly synthesized proteins within the ER as well as the timing and spatial patterning of depolarization-evoked Ca2+ responses in the cytoplasm. To understand the spatial and temporal properties of Ca2+ homeostasis in retinal neurons better, I studied expression and distribution of all three SERCA isoforms in the mouse retina using isoform-specific antibodies. No immunostaining was observed with the SERCA1 antibody. SERCA2 was expressed in photoreceptor inner segments, amacrine and ganglion cells of the mouse retina. Similar SERCA2 localization was observed in adult rat, macaque and ground squirrel retinas. Analysis of distribution of SERCA2 immunofluorescence in the developing mouse retina revealed prominent SERCA2 signals throughout postnatal development. The N89 antibodys used to identify the SERCA3 isoforms labelled cone outer segments, inner segments of photoreceptors and cell processes in the inner nuclear layer of the mouse retina. These results imply that the SERCA2 isoform controls Ca2+ sequestration into the endoplasmic reticulum in most classes of retinal neuron. A potential role for SERCA3 in cone function is suggested.
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Affiliation(s)
- David Krizaj
- Dept. of Ophthalmology, Beckman Vision Center, UCSF School of Medicine, Rm. K-140, 10 Kirkham St., San Francisco, CA 94143-0730, USA.
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