1
|
Van Baelen K, Geukens T, Maetens M, Tjan-Heijnen V, Lord CJ, Linn S, Bidard FC, Richard F, Yang WW, Steele RE, Pettitt SJ, Van Ongeval C, De Schepper M, Isnaldi E, Nevelsteen I, Smeets A, Punie K, Voorwerk L, Wildiers H, Floris G, Vincent Salomon A, Derksen PWB, Neven P, Senkus E, Sawyer E, Kok M, Desmedt C. Corrigendum to "Current and future diagnostic and treatment strategies for patients with invasive lobular breast cancer": [Annals of Oncology 33 (2022) 769-785]. Ann Oncol 2023; 34:326. [PMID: 36529568 DOI: 10.1016/j.annonc.2022.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- K Van Baelen
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven; Department of Gynaecology and Obstetrics, UZ Leuven, Leuven, Belgium
| | - T Geukens
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven; Department of General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - M Maetens
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven
| | - V Tjan-Heijnen
- Department of Medical Oncology Department, Maastricht University Medical Center (MUMC), School of GROW, Maastricht, The Netherlands
| | - C J Lord
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - S Linn
- Department of Pathology, University Medical Center Utrecht, Utrecht; Department of Medical Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands; Department of Molecular Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - F-C Bidard
- Department of Medical Oncology, Institut Curie, UVSQ/Paris-Saclav University, Paris, France
| | - F Richard
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven
| | - W W Yang
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - R E Steele
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - S J Pettitt
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | | | - M De Schepper
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven; Department of Pathology, UZ Leuven, Leuven, Belgium
| | - E Isnaldi
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven
| | - I Nevelsteen
- Department of Surgical Oncology, UZ Leuven, Leuven, Belgium
| | - A Smeets
- Department of Surgical Oncology, UZ Leuven, Leuven, Belgium
| | - K Punie
- Department of General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - L Voorwerk
- Department of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands; Department of Tumour Biology and Immunology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - H Wildiers
- Department of General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - G Floris
- Department of Pathology, UZ Leuven, Leuven, Belgium
| | | | - P W B Derksen
- Department of Pathology, University Medical Center Utrecht, Utrecht
| | - P Neven
- Department of Gynaecology and Obstetrics, UZ Leuven, Leuven, Belgium
| | - E Senkus
- Department of Oncology and Radiotherapy, Medical University of Gdańsk, Gdańsk, Poland
| | - E Sawyer
- School of Cancer and Pharmaceutical Sciences, Faculty of Life Sciences and Medicine, Guy's Cancer Centre, King's College London, London, UK
| | - M Kok
- Department of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands; Department of Tumour Biology and Immunology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - C Desmedt
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven.
| |
Collapse
|
2
|
Van Baelen K, Geukens T, Maetens M, Tjan-Heijnen V, Lord CJ, Linn S, Bidard FC, Richard F, Yang WW, Steele RE, Pettitt SJ, Van Ongeval C, De Schepper M, Isnaldi E, Nevelsteen I, Smeets A, Punie K, Voorwerk L, Wildiers H, Floris G, Vincent-Salomon A, Derksen PWB, Neven P, Senkus E, Sawyer E, Kok M, Desmedt C. Current and future diagnostic and treatment strategies for patients with invasive lobular breast cancer. Ann Oncol 2022; 33:769-785. [PMID: 35605746 DOI: 10.1016/j.annonc.2022.05.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 05/06/2022] [Accepted: 05/17/2022] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Invasive lobular breast cancer (ILC) is the second most common type of breast cancer after invasive breast cancer of no special type (NST), representing up to 15% of all breast cancers. DESIGN Latest data on ILC are presented, focusing on diagnosis, molecular make-up according to the European Society for Medical Oncology Scale for Clinical Actionability of molecular Targets (ESCAT) guidelines, treatment in the early and metastatic setting and ILC-focused clinical trials. RESULTS At the imaging level, magnetic resonance imaging-based and novel positron emission tomography/computed tomography-based techniques can overcome the limitations of currently used imaging techniques for diagnosing ILC. At the pathology level, E-cadherin immunohistochemistry could help improving inter-pathologist agreement. The majority of patients with ILC do not seem to benefit as much from (neo-)adjuvant chemotherapy as patients with NST, although chemotherapy might be required in a subset of high-risk patients. No differences in treatment efficacy are seen for anti-human epidermal growth factor receptor 2 (HER2) therapies in the adjuvant setting and cyclin-dependent kinases 4 and 6 inhibitors in the metastatic setting. The clinical utility of the commercially available prognostic gene expression-based tests is unclear for patients with ILC. Several ESCAT alterations differ in frequency between ILC and NST. Germline BRCA1 and PALB2 alterations are less frequent in patients with ILC, while germline CDH1 (gene coding for E-cadherin) alterations are more frequent in patients with ILC. Somatic HER2 mutations are more frequent in ILC, especially in metastases (15% ILC versus 5% NST). A high tumour mutational burden, relevant for immune checkpoint inhibition, is more frequent in ILC metastases (16%) than in NST metastases (5%). Tumours with somatic inactivating CDH1 mutations may be vulnerable for treatment with ROS1 inhibitors, a concept currently investigated in early and metastatic ILC. CONCLUSION ILC is a unique malignancy based on its pathological and biological features leading to differences in diagnosis as well as in treatment response, resistance and targets as compared to NST.
Collapse
Affiliation(s)
- K Van Baelen
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium; Departments of Gynaecology and Obstetrics, UZ Leuven, Leuven, Belgium
| | - T Geukens
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium; General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - M Maetens
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium
| | - V Tjan-Heijnen
- Medical Oncology Department, Maastricht University Medical Center (MUMC), School of GROW, Maastricht, The Netherlands
| | - C J Lord
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - S Linn
- Department of Pathology, University Medical Center Utrecht, Utrecht, The Netherlands; Departments of Medical Oncology, Amsterdam, The Netherlands; Molecular Pathology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - F-C Bidard
- Department of Medical Oncology, Institut Curie, UVSQ/Paris-Saclav University, Paris, France
| | - F Richard
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium
| | - W W Yang
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - R E Steele
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - S J Pettitt
- The CRUK Gene Function Laboratory and Breast Cancer Now Toby Robins Research Centre, The Institute of Cancer Research, London, UK
| | - C Van Ongeval
- Departments of Radiology, UZ Leuven, Leuven, Belgium
| | - M De Schepper
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium; Pathology, UZ Leuven, Leuven, Belgium
| | - E Isnaldi
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium
| | | | - A Smeets
- Surgical Oncology, UZ Leuven, Leuven, Belgium
| | - K Punie
- General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - L Voorwerk
- Departments of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands; Tumour Biology and Immunology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - H Wildiers
- General Medical Oncology, UZ Leuven, Leuven, Belgium
| | - G Floris
- Pathology, UZ Leuven, Leuven, Belgium
| | | | - P W B Derksen
- Department of Pathology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - P Neven
- Departments of Gynaecology and Obstetrics, UZ Leuven, Leuven, Belgium
| | - E Senkus
- Department of Oncology and Radiotherapy, Medical University of Gdańsk, Gdańsk, Poland
| | - E Sawyer
- School of Cancer and Pharmaceutical Sciences, Faculty of Life Sciences and Medicine, Guy's Cancer Centre, King's College London, London, UK
| | - M Kok
- Departments of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands; Tumour Biology and Immunology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - C Desmedt
- Laboratory for Translational Breast Cancer Research (LTBCR), Department of Oncology, KU Leuven, Leuven, Belgium.
| |
Collapse
|
3
|
da Silva D, Van Wesenbeeck L, Breilh D, Reigadas S, Anies G, Van Baelen K, Morlat P, Neau D, Dupon M, Wittkop L, Fleury H, Masquelier B. HIV-1 resistance patterns to integrase inhibitors in antiretroviral-experienced patients with virological failure on raltegravir-containing regimens. J Antimicrob Chemother 2010; 65:1262-9. [DOI: 10.1093/jac/dkq099] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
4
|
Missiaen L, Van Acker K, Van Baelen K, Raeymaekers L, Wuytack F, Parys JB, De Smedt H, Vanoevelen J, Dode L, Rizzuto R, Callewaert G. Calcium release from the Golgi apparatus and the endoplasmic reticulum in HeLa cells stably expressing targeted aequorin to these compartments. Cell Calcium 2004; 36:479-87. [PMID: 15488597 DOI: 10.1016/j.ceca.2004.04.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2004] [Revised: 04/18/2004] [Accepted: 04/20/2004] [Indexed: 10/26/2022]
Abstract
Extracellular agonists mobilize Ca2+ from SERCA-comprising intracellular Ca2+ stores located in both the Golgi apparatus and the endoplasmic reticulum. Ca2+ release from both these compartments was studied in HeLa cells stably expressing the luminescent Ca2+ indicator aequorin specifically targeted to these compartments. Changes in lumenal [Ca2+] as detected by the aequorin measurements were correlated with parallel changes in total Ca2+ content of the stores. The latencies and initial rates of Ca2+ release from the Golgi apparatus and the endoplasmic reticulum were quite similar. However, maximal Ca2+ release measured with Golgi-targeted aequorin terminated faster than that from the endoplasmic reticulum. The rate and extent of Ca2+ depletion from both compartments correlated well with the peak amplitude of the cytosolic [Ca2+] rise. Time-course experiments further revealed that the peak of the cytosolic Ca2+ response occurred before the lumenal [Ca2+] reached its lowest level. We conclude that both the Golgi apparatus and the endoplasmic reticulum contribute to the rise in cytosolic [Ca2+] upon agonist stimulation, but the kinetics of the Ca2+ release are different.
Collapse
Affiliation(s)
- L Missiaen
- Afdeling Fysiologie, K.U. Leuven Campus Gasthuisberg O/N, Herestraat 49, B-3000 Leuven, Belgium.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Vanoevelen J, Raeymaekers L, Parys JB, De Smedt H, Van Baelen K, Callewaert G, Wuytack F, Missiaen L. Inositol trisphosphate producing agonists do not mobilize the thapsigargin-insensitive part of the endoplasmic-reticulum and Golgi Ca2+ store. Cell Calcium 2004; 35:115-21. [PMID: 14706285 DOI: 10.1016/j.ceca.2003.08.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Non-mitochondrial intracellular Ca2+ stores contain both thapsigargin-sensitive sarco(endo)plasmic-reticulum Ca2+-ATPases (SERCA) and thapsigargin-insensitive secretory-pathway Ca2+-ATPases (SPCA1). We now have studied the Ca2+-release properties of the compartments associated with these pumps in intact, i.e. non-permeabilized, cells of different origin (HeLa, keratinocytes, 16HBE14o-, COS-1, A7r5) and with different approaches (45Ca2+ fluxes, Ca2+ imaging and measurements of the free luminal [Ca2+] in the endoplasmic-reticulum and the Golgi apparatus using targeted aequorin). Application of an extracellular agonist in the absence of thapsigargin induced in all cells a Ca2+ release from both the endoplasmic-reticulum and the Golgi apparatus. The agonists were not able to release Ca2+ in the presence of 10 microM thapsigargin, except in COS-1 cells overexpressing SPCA1, where this pump not only appeared in the Golgi compartment but also overflowed into the agonist-sensitive part of the endoplasmic-reticulum. We conclude that the subcompartments of the endoplasmic-reticulum and of the Golgi complex that endogenously express SPCA1 are insensitive to agonist stimulation.
Collapse
Affiliation(s)
- J Vanoevelen
- Laboratorium voor Fysiologie, K.U. Leuven Campus Gasthuisberg O/N, Leuven, Belgium
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Callewaert G, Parys JB, De Smedt H, Raeymaekers L, Wuytack F, Vanoevelen J, Van Baelen K, Simoni A, Rizzuto R, Missiaen L. Similar Ca(2+)-signaling properties in keratinocytes and in COS-1 cells overexpressing the secretory-pathway Ca(2+)-ATPase SPCA1. Cell Calcium 2003; 34:157-62. [PMID: 12810057 DOI: 10.1016/s0143-4160(03)00070-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Mutations in the ubiquitously expressed secretory-pathway Ca(2+)-ATPase (SPCA1) Ca(2+) pump result in Hailey-Hailey disease, which almost exclusively affects the epidermal part of the skin. We have studied Ca(2+) signaling in human keratinocytes by measuring the free Ca(2+) concentration in the cytoplasm and in the lumen of both the Golgi apparatus and the endoplasmic reticulum. These signals were compared with those recorded in SPCA1-overexpressing and control COS-1 cells. Both the sarco(endo)plasmic-reticulum Ca(2+)-ATPase (SERCA) and SPCA1 can mediate Ca(2+) uptake into the Golgi stacks. Our results indicate that keratinocytes mainly used the SPCA1 Ca(2+) pump to load the Golgi complex with Ca(2+) whereas the SERCA Ca(2+) pump was mainly used in control COS-1 cells. Cytosolic Ca(2+) signals in keratinocytes induced by extracellular ATP or capacitative Ca(2+) entry were characterized by an unusually long latency reflecting extra Ca(2+) buffering by an SPCA1-containing Ca(2+) store, similarly as in SPCA1-overexpressing COS-1 cells. Removal of extracellular Ca(2+) elicited spontaneous cytosolic Ca(2+) transients in keratinocytes, similarly as in SPCA1-overexpressing COS-1 cells. With respect to Ca(2+) signaling keratinocytes and SPCA1-overexpressing COS-1 cells therefore behaved similarly but differed from control COS-1 cells. The relatively large contribution of the SPCA1 pumps for loading the Golgi stores with Ca(2+) in keratinocytes may, at least partially, explain why mutations in the SPCA1 gene preferentially affect the skin in Hailey-Hailey patients.
Collapse
Affiliation(s)
- G Callewaert
- Laboratorium voor Fysiologie, K U Leuven Campus Gasthuisberg O/N, Herestraat 49, 3000 Leuven, Belgium
| | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Zwaal RR, Van Baelen K, Groenen JT, van Geel A, Rottiers V, Kaletta T, Dode L, Raeymaekers L, Wuytack F, Bogaert T. The sarco-endoplasmic reticulum Ca2+ ATPase is required for development and muscle function in Caenorhabditis elegans. J Biol Chem 2001; 276:43557-63. [PMID: 11559701 DOI: 10.1074/jbc.m104693200] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The sarco-endoplasmic reticulum Ca(2+)-transport ATPase (SERCA) loads intracellular releasable Ca(2+) stores by transporting cytosolic Ca(2+) into the endoplasmic (ER) or sarcoplasmic reticulum (SR). We characterized the only SERCA homologue of the nematode Caenorhabditis elegans, which is encoded by the sca-1 gene. The sca-1 transcript is alternatively spliced in a similar mode as the vertebrate SERCA2 transcript, giving rise to two protein variants: CeSERCAa and CeSERCAb. These proteins showed structural and functional conservation to the vertebrate SERCA2a/b proteins. The CeSERCAs were primarily expressed in contractile tissues. Loss of CeSERCA through gene ablation or RNA interference resulted in contractile dysfunctioning and in early larval or embryonic lethality, respectively. Similar defects could be induced pharmacologically using the SERCA-specific inhibitor thapsigargin, which bound CeSERCA at a conserved site. The conservation of SERCA2 homologues in C. elegans will allow genetic and chemical suppressor analyses to identify promising drug targets and lead molecules for treatment of SERCA-related diseases such as heart disease.
Collapse
Affiliation(s)
- R R Zwaal
- Devgen N.V., Technologiepark 9, B-9052 Zwijnaarde, Belgium.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Missiaen L, Van Acker K, Parys JB, De Smedt H, Van Baelen K, Weidema AF, Vanoevelen J, Raeymaekers L, Renders J, Callewaert G, Rizzuto R, Wuytack F. Baseline cytosolic Ca2+ oscillations derived from a non-endoplasmic reticulum Ca2+ store. J Biol Chem 2001; 276:39161-70. [PMID: 11514551 DOI: 10.1074/jbc.m104044200] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Cytosolic Ca(2+) oscillations can be due to cycles of release and re-uptake of internally stored Ca(2+). To investigate the nature of these Ca(2+) stores, we expressed the Pmr1 Ca(2+) pump of Caenorhabditis elegans in COS-1 cells and pretreated the cells with thapsigargin to prevent Ca(2+) uptake by the sarco(endo)plasmic reticulum Ca(2+)-ATPase. Pmr1 co-localized with the Golgi-specific 58K protein and was targeted to a Ca(2+) store that was less leaky for Ca(2+) than the endoplasmic reticulum and whose inositol trisphosphate receptors were less sensitive to inositol trisphosphate and ATP than those in the endoplasmic reticulum. ATP-stimulated Pmr1-overexpressing cells responded after a latency to extracellular Ca(2+) with a regenerative Ca(2+) signal, which could be prevented by caffeine. They also produced very stable ilimaquinone-sensitive baseline Ca(2+) spikes, even in the presence of thapsigargin. Such responses never occurred in non-transfected cells or in cells that overexpressed the type-1 sarco(endo)plasmic reticulum Ca(2+)-ATPase. Abortive Ca(2+) spikes also occurred in histamine-stimulated untransfected HeLa cells pretreated with thapsigargin, and they too were inhibited by ilimaquinone. We conclude that the Pmr1-induced Ca(2+) store, which probably corresponds to the Golgi compartment, can play a crucial role in setting up baseline Ca(2+) spiking.
Collapse
Affiliation(s)
- L Missiaen
- Laboratorium voor Fysiologie, K.U. Leuven Campus Gasthuisberg O/N, Herestraat 49, Leuven B-3000, Belgium.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Van Baelen K, Vanoevelen J, Missiaen L, Raeymaekers L, Wuytack F. The Golgi PMR1 P-type ATPase of Caenorhabditis elegans. Identification of the gene and demonstration of calcium and manganese transport. J Biol Chem 2001; 276:10683-91. [PMID: 11134055 DOI: 10.1074/jbc.m010553200] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In recent years, it has been well established that the Ca(2+) concentration in the lumen of intracellular organelles is a key determinant of cell function. Despite the fact that essential functions of the Golgi apparatus depend on the Ca(2+) and Mn(2+) concentration in its lumen, little is known on the transport system responsible for ion accumulation. The Golgi ion pump PMR1 has been functionally studied only in yeast. In humans, mutations in the orthologous gene ATP2C1 cause Hailey-Hailey disease. We report here the identification of the PMR1 homologue in the model organism Caenorhabditis elegans and after ectopic expression the direct study of its ion transport in permeabilized COS-1 cells. The C. elegans genome is predicted to contain a single PMR1 orthologue on chromosome I. We found evidence for alternative splicing in the 5'-untranslated region, but no indication for the generation of different protein isoforms. C. elegans PMR1 overexpressed in COS-1 cells transports Ca(2+) and Mn(2+) with high affinity into the Golgi apparatus in a thapsigargin-insensitive manner. Part of the accumulated Ca(2+) can be released by inositol 1,4,5-trisphosphate, in agreement with the idea that the Golgi apparatus is an inositol 1,4,5-trisphosphate-sensitive Ca(2+) store.
Collapse
Affiliation(s)
- K Van Baelen
- Laboratory of Physiology, K.U. Leuven, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven Belgium.
| | | | | | | | | |
Collapse
|
10
|
Dode L, Van Baelen K, Wuytack F, Dean WL. Low temperature molecular adaptation of the skeletal muscle sarco(endo)plasmic reticulum Ca2+-ATPase 1 (SERCA 1) in the wood frog (Rana sylvatica). J Biol Chem 2001; 276:3911-9. [PMID: 11044449 DOI: 10.1074/jbc.m007719200] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have compared the primary sequence and enzymatic properties of the sarcoplasmic reticulum Ca(2+)-ATPases from a cold-tolerant frog Rana sylvatica with those of a closely related cold-intolerant frog, Rana clamitans. Sarcoplasmic reticulum isolated from leg muscles of both species contains a major protein ( approximately 100 kDa) that reacts with a monoclonal antibody against sarco(endo)plasmic reticulum Ca(2+)-ATPase type 1 (SERCA1). The apparent molecular mass of R. sylvatica SERCA1 is 115 kDa, whereas that of R. clamitans is 105 kDa. However, the deduced amino acid sequences obtained from cDNAs do not indicate a difference in molecular weight, thus suggesting post-translational protein modification of R. sylvatica SERCA1. Comparison of the temperature dependence of both ATP hydrolysis and Ca(2+) transport indicates that R. sylvatica SERCA1 exhibits significantly lower activation energy below 20 degrees C and an approximately 2-fold greater Ca(2+)-ATPase activity near 0 degrees C. Furthermore, R. sylvatica SERCA1 exhibits simple Michaelis-Menten kinetics with ATP and Ca(2+) as opposed to the two-site ATP kinetics and positive cooperativity with Ca(2+) observed for R. clamitans and mammalian SERCA1s. Cooperativity has been linked to protein-protein interaction in SERCA1, and this property may be altered in R. sylvatica SERCA1. Primary sequence comparison shows that R. sylvatica SERCA1 exhibits seven unique amino acid substitutions, three of which are in the ATP binding domain. We also report for the first time the presence of alternative splicing in the frog, resulting in isoforms SERCA1a and SERCA1b. Thus, it appears that the low temperature muscle contractility of R. sylvatica can be explained partially by significant functional and structural differences in SERCA1.
Collapse
Affiliation(s)
- L Dode
- Laboratorium voor Fysiologie, Katholieke Universiteit Leuven, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium
| | | | | | | |
Collapse
|
11
|
Ver Heyen M, Reed TD, Blough RI, Baker DL, Zilberman A, Loukianov E, Van Baelen K, Raeymaekers L, Periasamy M, Wuytack F. Structure and organization of the mouse Atp2a2 gene encoding the sarco(endo)plasmic reticulum Ca2+-ATPase 2 (SERCA2) isoforms. Mamm Genome 2000; 11:159-63. [PMID: 10656932 DOI: 10.1007/s003350010030] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M Ver Heyen
- Laboratorium voor Fysiologie, Katholieke Universiteit Leuven, Campus Gasthuisberg, Belgium
| | | | | | | | | | | | | | | | | | | |
Collapse
|