1
|
The ataxia-linked E1081Q mutation affects the sub-plasma membrane Ca 2+-microdomains by tuning PMCA3 activity. Cell Death Dis 2022; 13:855. [PMID: 36207321 PMCID: PMC9546857 DOI: 10.1038/s41419-022-05300-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 09/22/2022] [Accepted: 09/26/2022] [Indexed: 01/23/2023]
Abstract
Calcium concentration must be finely tuned in all eukaryotic cells to ensure the correct performance of its signalling function. Neuronal activity is exquisitely dependent on the control of Ca2+ homeostasis: its alterations ultimately play a pivotal role in the origin and progression of many neurodegenerative processes. A complex toolkit of Ca2+ pumps and exchangers maintains the fluctuation of cytosolic Ca2+ concentration within the appropriate threshold. Two ubiquitous (isoforms 1 and 4) and two neuronally enriched (isoforms 2 and 3) of the plasma membrane Ca2+ATPase (PMCA pump) selectively regulate cytosolic Ca2+ transients by shaping the sub-plasma membrane (PM) microdomains. In humans, genetic mutations in ATP2B1, ATP2B2 and ATP2B3 gene have been linked with hearing loss, cerebellar ataxia and global neurodevelopmental delay: all of them were found to impair pump activity. Here we report three additional mutations in ATP2B3 gene corresponding to E1081Q, R1133Q and R696H amino acids substitution, respectively. Among them, the novel missense mutation (E1081Q) immediately upstream the C-terminal calmodulin-binding domain (CaM-BD) of the PMCA3 protein was present in two patients originating from two distinct families. Our biochemical and molecular studies on PMCA3 E1081Q mutant have revealed a splicing variant-dependent effect of the mutation in shaping the sub-PM [Ca2+]. The E1081Q substitution in the full-length b variant abolished the capacity of the pump to reduce [Ca2+] in the sub-PM microdomain (in line with the previously described ataxia-related PMCA mutations negatively affecting Ca2+ pumping activity), while, surprisingly, its introduction in the truncated a variant selectively increased Ca2+ extrusion activity in the sub-PM Ca2+ microdomains. These results highlight the importance to set a precise threshold of [Ca2+] by fine-tuning the sub-PM microdomains and the different contribution of the PMCA splice variants in this regulation.
Collapse
|
2
|
Structure, Function and Regulation of the Plasma Membrane Calcium Pump in Health and Disease. Int J Mol Sci 2022; 23:ijms23031027. [PMID: 35162948 PMCID: PMC8835232 DOI: 10.3390/ijms23031027] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/30/2021] [Accepted: 01/06/2022] [Indexed: 12/28/2022] Open
Abstract
In this review, I summarize the present knowledge of the structural and functional properties of the mammalian plasma membrane calcium pump (PMCA). It is outlined how the cellular expression of the different spliced isoforms of the four genes are regulated under normal and pathological conditions.
Collapse
|
3
|
Corradi GR, Mazzitelli LR, Petrovich GD, de Tezanos Pinto F, Rochi L, Adamo HP. Plasma Membrane Ca 2+ Pump PMCA4z Is More Active Than Splicing Variant PMCA4x. Front Cell Neurosci 2021; 15:668371. [PMID: 34512262 PMCID: PMC8428515 DOI: 10.3389/fncel.2021.668371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/22/2021] [Indexed: 11/13/2022] Open
Abstract
The plasma membrane Ca2+ pumps (PMCA) are P-ATPases that control Ca2+ signaling and homeostasis by transporting Ca2+ out of the eukaryotic cell. Humans have four genes that code for PMCA isoforms (PMCA1-4). A large diversity of PMCA isoforms is generated by alternative mRNA splicing at sites A and C. The different PMCA isoforms are expressed in a cell-type and developmental-specific manner and exhibit differential sensitivity to a great number of regulatory mechanisms. PMCA4 has two A splice variants, the forms "x" and "z". While PMCA4x is ubiquitously expressed and relatively well-studied, PMCA4z is less characterized and its expression is restricted to some tissues such as the brain and heart muscle. PMCA4z lacks a stretch of 12 amino acids in the so-called A-M3 linker, a conformation-sensitive region of the molecule connecting the actuator domain (A) with the third transmembrane segment (M3). We expressed in yeast PMCA4 variants "x" and "z", maintaining constant the most frequent splice variant "b" at the C-terminal end, and obtained purified preparations of both proteins. In the basal autoinhibited state, PMCA4zb showed a higher ATPase activity and a higher apparent Ca2+ affinity than PMCA4xb. Both isoforms were stimulated by calmodulin but PMCA4zb was more strongly activated by acidic lipids than PMCA4xb. The results indicate that a PMCA4 intrinsically more active and more responsive to acidic lipids is produced by the variant "z" of the splicing site A.
Collapse
Affiliation(s)
- Gerardo R Corradi
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Luciana R Mazzitelli
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Guido D Petrovich
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Felicitas de Tezanos Pinto
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Lucia Rochi
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Hugo P Adamo
- Departamento de Química Biológica, Instituto de Química y Fisicoquímica Biológicas, Facultad de Farmacia y Bioquímica, Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad de Buenos Aires, Buenos Aires, Argentina
| |
Collapse
|
4
|
Zaidi A, Adewale M, McLean L, Ramlow P. The plasma membrane calcium pumps-The old and the new. Neurosci Lett 2019; 663:12-17. [PMID: 29452610 DOI: 10.1016/j.neulet.2017.09.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 09/29/2017] [Accepted: 09/30/2017] [Indexed: 12/27/2022]
Abstract
The plasma membrane Ca2+-ATPase (PMCA) pumps play a critical role in the maintenance of calcium (Ca2+) homeostasis, crucial for optimal neuronal function and cell survival. Loss of Ca2+ homeostasis is a key precursor in neuronal dysfunction associated with brain aging and in the pathogenesis of neurodegenerative disorders. In this article, we review evidence showing age-related changes in the PMCAs in synaptic plasma membranes (SPMs) and lipid raft microdomains isolated from rat brain. Both PMCA activity and protein levels decline progressively with increasing age. However, the loss of activity is disproportionate to the reduction of protein levels suggesting the presence of dysfunctional PMCA molecules in aged brain. PMCA activity is also diminished in post-mortem human brain samples from Alzheimer's disease and Parkinson's disease patients and in cell models of these neurodegenerative disorders. Experimental reduction of the PMCAs not only alter Ca2+ homeostasis but also have diverse effects on neurons such as reduced neuritic network, impaired release of neurotransmitter and increased susceptibility to stressful stimuli, particularly to agents that elevate intracellular Ca2+ [Ca2+]i. Loss of PMCA is likely to contribute to neuronal dysfunction observed in the aging brain and in the development of age-dependent neurodegenerative disorders. Therapeutic (pharmacological and/or non-pharmacological) approaches that can enhance PMCA activity and stabilize [Ca2+]i homeostasis may be capable of preventing, slowing, and/or reversing neuronal degeneration.
Collapse
Affiliation(s)
- Asma Zaidi
- Division of Basic Sciences, Kansas City University of Medicine and Biosciences, 1750 Independence Avenue, Kansas City, MO 64106, USA.
| | - Mercy Adewale
- Division of Basic Sciences, Kansas City University of Medicine and Biosciences, 1750 Independence Avenue, Kansas City, MO 64106, USA
| | - Lauren McLean
- Division of Basic Sciences, Kansas City University of Medicine and Biosciences, 1750 Independence Avenue, Kansas City, MO 64106, USA
| | - Paul Ramlow
- Division of Basic Sciences, Kansas City University of Medicine and Biosciences, 1750 Independence Avenue, Kansas City, MO 64106, USA
| |
Collapse
|
5
|
Khariv V, Acioglu C, Ni L, Ratnayake A, Li L, Tao YX, Heary RF, Elkabes S. A link between plasma membrane calcium ATPase 2 (PMCA2), estrogen and estrogen receptor α signaling in mechanical pain. Sci Rep 2018; 8:17260. [PMID: 30467368 PMCID: PMC6250714 DOI: 10.1038/s41598-018-35263-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 10/30/2018] [Indexed: 12/29/2022] Open
Abstract
Earlier studies on genetically modified mice indicated that plasma membrane calcium ATPase 2 (PMCA2), a calcium extrusion pump, plays a novel and sex-dependent role in mechanical pain responses: female, but not male, PMCA2+/− mice manifest increased mechanical pain compared to female PMCA2+/+ mice. The goal of the present studies was to determine the contribution of ovarian steroids to the genotype- and sex-dependent manifestation of mechanical pain in PMCA2+/+ versus PMCA2+/− mice. Ovariectomy increased mechanical pain sensitivity and 17β-estradiol (E2) replacement restored it to basal levels in PMCA2+/+ mice, but not in PMCA2+/− littermates. Intrathecal administration of an estrogen receptor alpha (ERα) agonist induced ERα signaling in the dorsal horn (DH) of female PMCA2+/+ mice, but was ineffective in PMCA2+/− mice. In male PMCA2+/+ and PMCA2+/− mice, E2 treatment following orchidectomy did not recapitulate the genotype-dependent differential pain responses observed in females and the agonist did not elicit ERα signaling. These findings establish a novel, female-specific link between PMCA2, ERα and mechanical pain. It is postulated that PMCA2 is essential for adequate ERα signaling in the female DH and that impaired ERα signaling in the female PMCA2+/− mice hinders the analgesic effects of E2 leading to increased sensitivity to mechanical stimuli.
Collapse
Affiliation(s)
- Veronika Khariv
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA.,The School of Graduate Studies, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Cigdem Acioglu
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA
| | - Li Ni
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA
| | - Ayomi Ratnayake
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA
| | - Lun Li
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA.,The School of Graduate Studies, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, 07103, USA
| | - Robert F Heary
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA
| | - Stella Elkabes
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers,The State University of New Jersey, Newark, NJ, 07103, USA.
| |
Collapse
|
6
|
Expression of calcium pumps is differentially regulated by histone deacetylase inhibitors and estrogen receptor alpha in breast cancer cells. BMC Cancer 2018; 18:1029. [PMID: 30352569 PMCID: PMC6199715 DOI: 10.1186/s12885-018-4945-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 10/12/2018] [Indexed: 12/24/2022] Open
Abstract
Background Remodeling of Ca2+ signaling is an important step in cancer progression, and altered expression of members of the Ca2+ signaling toolkit including the plasma membrane Ca2+ ATPases (PMCA proteins encoded by ATP2B genes) is common in tumors. Methods In this study PMCAs were examined in breast cancer datasets and in a variety of breast cancer cell lines representing different subtypes. We investigated how estrogen receptor alpha (ER-α) and histone deacetylase (HDAC) inhibitors regulate the expression of these pumps. Results Three distinct datasets displayed significantly lower ATP2B4 mRNA expression in invasive breast cancer tissue samples compared to normal breast tissue, whereas the expression of ATP2B1 and ATP2B2 was not altered. Studying the protein expression profiles of Ca2+ pumps in a variety of breast cancer cell lines revealed low PMCA4b expression in the ER-α positive cells, and its marked upregulation upon HDAC inhibitor treatments. PMCA4b expression was also positively regulated by the ER-α pathway in MCF-7 cells that led to enhanced Ca2+ extrusion capacity in response to 17β-estradiol (E2) treatment. E2-induced PMCA4b expression was further augmented by HDAC inhibitors. Surprisingly, E2 did not affect the expression of PMCA4b in other ER-α positive cells ZR-75-1, T-47D and BT-474. These findings were in good accordance with ChIP-seq data analysis that revealed an ER-α binding site in the ATP2B4 gene in MCF-7 cells but not in other ER-α positive tumor cells. In the triple negative cells PMCA4b expression was relatively high, and the effect of HDAC inhibitor treatment was less pronounced as compared to that of the ER-α positive cells. Although, the expression of PMCA4b was relatively high in the triple negative cells, a fraction of the protein was found in intracellular compartments that could interfere with the cellular function of the protein. Conclusions Our results suggest that the expression of Ca2+ pumps is highly regulated in breast cancer cells in a subtype specific manner. Our results suggest that hormonal imbalances, epigenetic modifications and impaired protein trafficking could interfere with the expression and cellular function of PMCA4b in the course of breast cancer progression. Electronic supplementary material The online version of this article (10.1186/s12885-018-4945-x) contains supplementary material, which is available to authorized users.
Collapse
|
7
|
Vicario M, Zanni G, Vallese F, Santorelli F, Grinzato A, Cieri D, Berto P, Frizzarin M, Lopreiato R, Zonta F, Ferro S, Sandre M, Marin O, Ruzzene M, Bertini E, Zanotti G, Brini M, Calì T, Carafoli E. A V1143F mutation in the neuronal-enriched isoform 2 of the PMCA pump is linked with ataxia. Neurobiol Dis 2018; 115:157-166. [PMID: 29655659 DOI: 10.1016/j.nbd.2018.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 03/21/2018] [Accepted: 04/09/2018] [Indexed: 12/13/2022] Open
Abstract
The fine regulation of intracellular calcium is fundamental for all eukaryotic cells. In neurons, Ca2+ oscillations govern the synaptic development, the release of neurotransmitters and the expression of several genes. Alterations of Ca2+ homeostasis were found to play a pivotal role in neurodegenerative progression. The maintenance of proper Ca2+ signaling in neurons demands the continuous activity of Ca2+ pumps and exchangers to guarantee physiological cytosolic concentration of the cation. The plasma membrane Ca2+ATPases (PMCA pumps) play a key role in the regulation of Ca2+ handling in selected sub-plasma membrane microdomains. Among the four basic PMCA pump isoforms existing in mammals, isoforms 2 and 3 are particularly enriched in the nervous system. In humans, genetic mutations in the PMCA2 gene in association with cadherin 23 mutations have been linked to hearing loss phenotypes, while those occurring in the PMCA3 gene were associated with X-linked congenital cerebellar ataxias. Here we describe a novel missense mutation (V1143F) in the calmodulin binding domain (CaM-BD) of the PMCA2 protein. The mutant pump was present in a patient showing congenital cerebellar ataxia but no overt signs of deafness, in line with the absence of mutations in the cadherin 23 gene. Biochemical and molecular dynamics studies on the mutated PMCA2 have revealed that the V1143F substitution alters the binding of calmodulin to the CaM-BD leading to impaired Ca2+ ejection.
Collapse
Affiliation(s)
- Mattia Vicario
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Ginevra Zanni
- Department of Neurosciences, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Francesca Vallese
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | | | - Alessandro Grinzato
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Domenico Cieri
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Paola Berto
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Martina Frizzarin
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Raffaele Lopreiato
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Francesco Zonta
- Shanghai Institute of Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, China; Department of Biomedical Sciences, Institute of Cell Biology and Neurobiology, Italian National Research Council, 00015 Monterotondo, Rome, Italy
| | - Stefania Ferro
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Michele Sandre
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Oriano Marin
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Maria Ruzzene
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Enrico Bertini
- Department of Neurosciences, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Giuseppe Zanotti
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy
| | - Marisa Brini
- Department of Biology, University of Padova, Italy.
| | - Tito Calì
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy; Padua Neuroscience Center (PNC), University of Padua, 35122 Padova, Italy.
| | | |
Collapse
|
8
|
Roome CJ, Empson RM. Survival strategies for mouse cerebellar Purkinje neurons lacking PMCA2. Neurosci Lett 2018; 663:25-28. [PMID: 29452612 DOI: 10.1016/j.neulet.2017.09.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 09/23/2017] [Indexed: 11/25/2022]
Abstract
Expression of the fast calcium extrusion protein, PMCA2, in the cerebellum is amongst the highest found throughout the central nervous system, and unsurprisingly PMCA2 knockout mice exhibit cerebellar ataxia or loss of controlled movement. The sole output neurons of the cerebellar cortex, Purkinje neurons, are functionally compromised in these knockout mice, yet remarkably these neurons survive. In this mini-review we review and speculate on the importance of multiple PMCA2 dependent actions at cellular and synaptic sites within the cerebellar Purkinje neuron network. We also explore how loss of PMCA2-/- can lead to the ataxic phenotype, but can paradoxically also minimise calcium rises in cerebellar Purkinje neurons, thereby ensuring their resilience and survival.
Collapse
Affiliation(s)
- Christopher J Roome
- Optical Neuroimaging Unit, Okinawa Institute of Science and Technology Graduate University (OIST), 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
| | - Ruth M Empson
- Department of Physiology, School of Biomedical Sciences, Brain Health Research Centre, Brain Research New Zealand, University of Otago, PO Box 56, Dunedin 9054, New Zealand.
| |
Collapse
|
9
|
Khariv V, Elkabes S. Contribution of Plasma Membrane Calcium ATPases to neuronal maladaptive responses: Focus on spinal nociceptive mechanisms and neurodegeneration. Neurosci Lett 2017; 663:60-65. [PMID: 28780172 DOI: 10.1016/j.neulet.2017.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/10/2017] [Accepted: 08/01/2017] [Indexed: 10/19/2022]
Abstract
Plasma membrane calcium ATPases (PMCAs) are ion pumps that expel Ca2+ from cells and maintain Ca2+ homeostasis. Four isoforms and multiple splice variants play important and non-overlapping roles in cellular function and integrity and have been implicated in diseases including disorders of the central nervous system (CNS). In particular, one of these isoforms, PMCA2, is critical for spinal cord (SC) neuronal function. PMCA2 expression is decreased in SC neurons at onset of symptoms in animal models of multiple sclerosis. Decreased PMCA2 expression affects the function and viability of SC neurons, with motor neurons being the most vulnerable population. Recent studies have also shown that PMCA2 could be an important contributor to pain processing in the dorsal horn (DH) of the SC. Pain sensitivity was altered in female, but not male, PMCA2+/- mice compared to PMCA2+/+ littermates in a modality-dependent manner. Changes in pain responsiveness in the female PMCA2+/- mice were paralleled by female-specific alterations in the expression of effectors, which have been implicated in the excitability of DH neurons, in mechanisms governing nociception and in the transmission of pain signals. Other PMCA isoforms and in particular, PMCA4, also contribute to the excitability of neurons in the dorsal root ganglia (DRG), which contain the first-order sensory neurons that convey nociceptive information from the periphery to the DH. These findings suggest that specific PMCA isoforms play specialized functions in neurons that mediate pain processing. Further investigations are necessary to unravel the precise contribution of PMCAs to mechanisms governing pathological pain in models of injury and disease.
Collapse
Affiliation(s)
- Veronika Khariv
- Department of Neurological Surgery, Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, United States; Graduate School of Biomedical Sciences, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, United States
| | - Stella Elkabes
- Department of Neurological Surgery, Reynolds Family Spine Laboratory, New Jersey Medical School, Rutgers, The State University of New Jersey, Newark, NJ, United States.
| |
Collapse
|
10
|
Hegedüs L, Padányi R, Molnár J, Pászty K, Varga K, Kenessey I, Sárközy E, Wolf M, Grusch M, Hegyi Z, Homolya L, Aigner C, Garay T, Hegedüs B, Tímár J, Kállay E, Enyedi Á. Histone Deacetylase Inhibitor Treatment Increases the Expression of the Plasma Membrane Ca 2+ Pump PMCA4b and Inhibits the Migration of Melanoma Cells Independent of ERK. Front Oncol 2017; 7:95. [PMID: 28596940 PMCID: PMC5442207 DOI: 10.3389/fonc.2017.00095] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 04/27/2017] [Indexed: 12/13/2022] Open
Abstract
Several new therapeutic options emerged recently to treat metastatic melanoma; however, the high frequency of intrinsic and acquired resistance among patients shows a need for new therapeutic options. Previously, we identified the plasma membrane Ca2+ ATPase 4b (PMCA4b) as a metastasis suppressor in BRAF-mutant melanomas and found that mutant BRAF inhibition increased the expression of the pump, which then inhibited the migratory and metastatic capability of the cells. Earlier it was also demonstrated that histone deacetylase inhibitors (HDACis) upregulated PMCA4b expression in gastric, colon, and breast cancer cells. In this study, we treated one BRAF wild-type and two BRAF-mutant melanoma cell lines with the HDACis, SAHA and valproic acid, either alone, or in combination with the BRAF inhibitor, vemurafenib. We found that HDACi treatment strongly increased the expression of PMCA4b in all cell lines irrespective of their BRAF mutational status, and this effect was independent of ERK activity. Furthermore, HDAC inhibition also enhanced the abundance of the housekeeping isoform PMCA1. Combination of HDACis with vemurafenib, however, did not have any additive effects on either PMCA isoform. We demonstrated that the HDACi-induced increase in PMCA abundance was coupled to an enhanced [Ca2+]i clearance rate and also strongly inhibited both the random and directional movements of A375 cells. The primary role of PMCA4b in these characteristic changes was demonstrated by treatment with the PMCA4-specific inhibitor, caloxin 1c2, which was able to restore the slower Ca2+ clearance rate and higher motility of the cells. While HDAC treatment inhibited cell motility, it decreased only modestly the ratio of proliferative cells and cell viability. Our results show that in melanoma cells the expression of both PMCA4b and PMCA1 is under epigenetic control and the elevation of PMCA4b expression either by HDACi treatment or by the decreased activation of the BRAF-MEK-ERK pathway can inhibit the migratory capacity of the highly motile A375 cells.
Collapse
Affiliation(s)
- Luca Hegedüs
- Department of Thoracic Surgery, Ruhrlandklinik, University Clinic Essen, Essen, Germany.,Department of Pathophysiology and Allergy Research, Comprehensive Cancer Center Vienna, Medical University of Vienna, Vienna, Austria
| | - Rita Padányi
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary
| | - Judit Molnár
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary
| | - Katalin Pászty
- Molecular Biophysics Research Group of the Hungarian Academy of Sciences, Department of Biophysics, Semmelweis University, Budapest, Hungary
| | - Karolina Varga
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary.,MTA-SE-NAP Brain Metastasis Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| | - István Kenessey
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary
| | - Eszter Sárközy
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary
| | - Matthias Wolf
- Department of Medicine I, Institute of Cancer Research, Comprehensive Cancer Center Vienna, Medical University of Vienna, Vienna, Austria
| | - Michael Grusch
- Department of Medicine I, Institute of Cancer Research, Comprehensive Cancer Center Vienna, Medical University of Vienna, Vienna, Austria
| | - Zoltán Hegyi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - László Homolya
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Clemens Aigner
- Department of Thoracic Surgery, Ruhrlandklinik, University Clinic Essen, Essen, Germany
| | - Tamás Garay
- Molecular Oncology Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| | - Balázs Hegedüs
- Department of Thoracic Surgery, Ruhrlandklinik, University Clinic Essen, Essen, Germany.,Molecular Oncology Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| | - József Tímár
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary.,Molecular Oncology Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| | - Enikö Kállay
- Department of Pathophysiology and Allergy Research, Comprehensive Cancer Center Vienna, Medical University of Vienna, Vienna, Austria
| | - Ágnes Enyedi
- 2nd Institute of Pathology, Semmelweis University, Budapest, Hungary.,Molecular Oncology Research Group of the Hungarian Academy of Sciences, Semmelweis University, Budapest, Hungary
| |
Collapse
|
11
|
Zámbó B, Várady G, Padányi R, Szabó E, Németh A, Langó T, Enyedi Á, Sarkadi B. Decreased calcium pump expression in human erythrocytes is connected to a minor haplotype in the ATP2B4 gene. Cell Calcium 2017; 65:73-79. [PMID: 28216081 DOI: 10.1016/j.ceca.2017.02.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 02/02/2017] [Accepted: 02/02/2017] [Indexed: 12/21/2022]
Abstract
Plasma membrane Ca2+-ATPases are key calcium exporter proteins in most tissues, and PMCA4b is the main calcium transporter in the human red blood cells (RBCs). In order to assess the expression level of PMCA4b, we have developed a flow cytometry and specific antibody binding method to quantitatively detect this protein in the erythrocyte membrane. Interestingly, we found several healthy volunteers showing significantly reduced expression of RBC-PMCA4b. Western blot analysis of isolated RBC membranes confirmed this observation, and indicated that there are no compensatory alterations in other PMCA isoforms. In addition, reduced PMCA4b levels correlated with a lower calcium extrusion capacity in these erythrocytes. When exploring the potential genetic background of the reduced PMCA4b levels, we found no missense mutations in the ATP2B4 coding regions, while a formerly unrecognized minor haplotype in the predicted second promoter region closely correlated with lower erythrocyte PMCA4b protein levels. In recent GWA studies, SNPs in this ATP2B4 haplotype have been linked to reduced mean corpuscular hemoglobin concentrations (MCHC), and to protection against malaria infection. Our data suggest that an altered regulation of gene expression is responsible for the reduced RBC-PMCA4b levels that is probably linked to the development of human disease-related phenotypes.
Collapse
Affiliation(s)
- Boglárka Zámbó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary
| | - György Várady
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary
| | - Rita Padányi
- 2nd Department of Pathology, Faculty of Medicine, Semmelweis University, Ulloi ut 26., Budapest, 1085, Hungary
| | - Edit Szabó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary
| | - Adrienn Németh
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary
| | - Tamás Langó
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary
| | - Ágnes Enyedi
- 2nd Department of Pathology, Faculty of Medicine, Semmelweis University, Ulloi ut 26., Budapest, 1085, Hungary; Molecular Oncology Research Group of the Hungarian Academy of Sciences and Semmelweis University, Ulloi ut 26., Budapest, 1085, Hungary
| | - Balázs Sarkadi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudosok krt. 2, Budapest, 1117, Hungary; MTA-SE Molecular Biophysics Research Group, Department of Biophysics and Radiation Biology, Semmelweis University, Tuzolto u. 37-43., Budapest, 1094, Hungary.
| |
Collapse
|
12
|
Implications of the thyroid hormone on neuronal development with special emphasis on the calmodulin-kinase IV pathway. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1864:877-882. [PMID: 27939430 DOI: 10.1016/j.bbamcr.2016.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/29/2016] [Accepted: 12/02/2016] [Indexed: 12/16/2022]
Abstract
Thyroid hormones influence brain development through regulation of gene expression. This is especially true for Ca2+-dependent regulation since a major pathway is controlled by the Ca2+/calmodulin-dependent protein kinase IV (CaMKIV) which in turn is induced by the thyroid hormone T3. In addition, CaMKIV is involved in regulation of alternative splicing of a number of protein isoforms, among them PMCA1a, the neuronal specific isoform of the plasma membrane calcium pump. On the other hand, hypothyroidism or CaMKIV deficiency can have a severe influence on brain development. This article is part of a Special Issue entitled: ECS Meeting edited by Claus Heizmann, Joachim Krebs and Jacques Haiech.
Collapse
|
13
|
Hegedũs L, Garay T, Molnár E, Varga K, Bilecz Á, Török S, Padányi R, Pászty K, Wolf M, Grusch M, Kállay E, Döme B, Berger W, Hegedũs B, Enyedi A. The plasma membrane
C
a
2+
pump
PMCA
4b inhibits the migratory and metastatic activity of
BRAF
mutant melanoma cells. Int J Cancer 2016; 140:2758-2770. [DOI: 10.1002/ijc.30503] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 10/24/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Luca Hegedũs
- Department of Pathophysiology and Allergy ResearchComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
| | - Tamás Garay
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
- Department of Biological PhysicsEötvös UniversityBudapest Hungary
| | - Eszter Molnár
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
| | - Karolina Varga
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
| | - Ágnes Bilecz
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
| | - Szilvia Török
- National Koranyi Institute of PulmonologyBudapest Hungary
| | - Rita Padányi
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
| | - Katalin Pászty
- Molecular Biophysics Research Group of the Hungarian Academy of Sciences and Department of BiophysicsSemmelweis UniversityBudapest Hungary
| | - Matthias Wolf
- Department of Medicine I, Institute of Cancer ResearchComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
| | - Michael Grusch
- Department of Medicine I, Institute of Cancer ResearchComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
| | - Enikõ Kállay
- Department of Pathophysiology and Allergy ResearchComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
| | - Balázs Döme
- National Koranyi Institute of PulmonologyBudapest Hungary
- Department of Surgery, Division of Thoracic SurgeryComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
- Department of Thoracic SurgeryNational Institute of Oncology‐Semmelweis UniversityBudapest, Hungary
- Department of Biomedical Imaging and Image‐guided TherapyMedical University of ViennaVienna Austria
| | - Walter Berger
- Department of Medicine I, Institute of Cancer ResearchComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
| | - Balázs Hegedũs
- Department of Surgery, Division of Thoracic SurgeryComprehensive Cancer Center Vienna, Medical University of ViennaVienna Austria
- Department of Thoracic SurgeryRuhrlandklinik, University Clinic EssenEssen Germany
- Molecular Oncology Research Group of the Hungarian Academy of Sciences and 2nd Department of Pathology, Semmelweis UniversityBudapest Hungary
| | - Agnes Enyedi
- 2nd Department of PathologySemmelweis UniversityBudapest, Hungary
- Molecular Oncology Research Group of the Hungarian Academy of Sciences and 2nd Department of Pathology, Semmelweis UniversityBudapest Hungary
| |
Collapse
|
14
|
Khariv V, Ni L, Ratnayake A, Sampath S, Lutz BM, Tao XX, Heary RF, Elkabes S. Impaired sensitivity to pain stimuli in plasma membrane calcium ATPase 2 (PMCA2) heterozygous mice: a possible modality- and sex-specific role for PMCA2 in nociception. FASEB J 2016; 31:224-237. [PMID: 27702770 DOI: 10.1096/fj.201600541r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Accepted: 09/22/2016] [Indexed: 11/11/2022]
Abstract
Plasma membrane calcium ATPase 2 (PMCA2) is a calcium pump that plays important roles in neuronal function. Although it is expressed in pain-associated regions of the CNS, including in the dorsal horn (DH), its contribution to pain remains undefined. The present study assessed the role of PMCA2 in pain responsiveness and the link between PMCA2 and glutamate receptors, GABA receptors (GABARs), and glutamate transporters that have been implicated in pain processing in the DH of adult female and male PMCA2+/+ and PMCA2+/- mice. Behavioral assays evaluated mechanical and thermal pain responsiveness. Mechanical sensitivity was significantly increased by 52% and heat sensitivity was reduced by 29% in female, but not male, PMCA2+/- mice compared with PMCA2+/+ controls. There were female-specific changes in metabotropic glutamate receptor 1, NMDA receptor 2A, α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor subunit GluR1, GABABR1, and GABABR2 levels, whereas metabotropic glutamate receptor 5, NMDA receptor 2B, GluR2, and GABAARα2 levels were not altered. Glutamate aspartate transporter levels were higher and glial glutamate transporter 1 levels were lower in the DH of female, but not male, PMCA2+/- mice. These findings indicate a novel role for PMCA2 in modality- and sex-dependent pain responsiveness. Female-specific molecular changes potentially account for the altered pain responses.-Khariv, V., Ni, L., Ratnayake, A., Sampath, S., Lutz, B. M., Tao, X.-X., Heary, R. F., Elkabes, S. Impaired sensitivity to pain stimuli in plasma membrane calcium ATPase 2 (PMCA2) heterozygous mice: a possible modality- and sex-specific role for PMCA2 in nociception.
Collapse
Affiliation(s)
- Veronika Khariv
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA.,Graduate School of Biomedical Sciences, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Li Ni
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Ayomi Ratnayake
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Sujitha Sampath
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Brianna M Lutz
- Graduate School of Biomedical Sciences, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA.,Department of Anesthesiology, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA; and
| | - Xuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA; and
| | - Robert F Heary
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA
| | - Stella Elkabes
- Department of Neurological Surgery, The Reynolds Family Spine Laboratory, New Jersey Medical School-Rutgers, The State University of New Jersey, Newark, New Jersey, USA;
| |
Collapse
|
15
|
Ghosh B, Green MV, Krogh KA, Thayer SA. Interleukin-1β activates an Src family kinase to stimulate the plasma membrane Ca2+ pump in hippocampal neurons. J Neurophysiol 2016; 115:1875-85. [PMID: 26843596 PMCID: PMC4869483 DOI: 10.1152/jn.00541.2015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 01/23/2016] [Indexed: 01/09/2023] Open
Abstract
The plasma membrane Ca(2+) ATPase (PMCA) plays a major role in clearing Ca(2+) from the neuronal cytoplasm. The cytoplasmic Ca(2+) clearance rate affects neuronal excitability, synaptic plasticity, and neurotransmission. Here, we examined the modulation of PMCA activity by PTKs in hippocampal neurons. PMCA-mediated Ca(2+) clearance slowed in the presence of pyrazolopyrimidine 2, an inhibitor of Src family kinases (SFKs), and accelerated in the presence of C2-ceramide, an activator of PTKs. Ca(2+) clearance kinetics were attenuated in cells expressing a dominant-negative Src mutant, suggesting that the pump is tonically stimulated by a PTK. Tonic stimulation was reduced in hippocampal neurons expressing short hairpin (sh)RNA directed to mRNA for Yes. shRNA-mediated knockdown of PMCA isoform 1 (PMCA1) removed tonic stimulation of Ca(2+) clearance, indicating that the kinase stimulates PMCA1. IL-1β accelerated Ca(2+) clearance in a manner blocked by an IL-1β receptor antagonist or by an inhibitor of neutral sphingomyelinase, the enzyme that produces ceramide. Thus IL-1β activates an SFK to stimulate the plasma membrane Ca(2+) pump, decreasing the duration of Ca(2+) transients in hippocampal neurons.
Collapse
Affiliation(s)
- Biswarup Ghosh
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Matthew V Green
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Kelly A Krogh
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota
| | - Stanley A Thayer
- Department of Pharmacology, University of Minnesota Medical School, Minneapolis, Minnesota
| |
Collapse
|
16
|
Figueroa KP, Paul S, Calì T, Lopreiato R, Karan S, Frizzarin M, Ames D, Zanni G, Brini M, Dansithong W, Milash B, Scoles DR, Carafoli E, Pulst SM. Spontaneous shaker rat mutant - a new model for X-linked tremor/ataxia. Dis Model Mech 2016; 9:553-62. [PMID: 27013529 PMCID: PMC4892658 DOI: 10.1242/dmm.022848] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 02/29/2016] [Indexed: 12/18/2022] Open
Abstract
The shaker rat is an X-linked recessive spontaneous model of progressive Purkinje cell (PC) degeneration exhibiting a shaking ataxia and wide stance. Generation of Wistar Furth (WF)/Brown Norwegian (BN) F1 hybrids and genetic mapping of F2 sib-sib offspring using polymorphic markers narrowed the candidate gene region to 26 Mbp denoted by the last recombinant genetic marker DXRat21 at 133 Mbp to qter (the end of the long arm). In the WF background, the shaker mutation has complete penetrance, results in a stereotypic phenotype and there is a narrow window for age of disease onset; by contrast, the F2 hybrid phenotype was more varied, with a later age of onset and likely non-penetrance of the mutation. By deep RNA-sequencing, five variants were found in the candidate region; four were novel without known annotation. One of the variants caused an arginine (R) to cysteine (C) change at codon 35 of the ATPase, Ca2+ transporting, plasma membrane 3 (Atp2b3) gene encoding PMCA3 that has high expression in the cerebellum. The variant was well supported by hundreds of overlapping reads, and was found in 100% of all affected replicas and 0% of the wild-type (WT) replicas. The mutation segregated with disease in all affected animals and the amino acid change was found in an evolutionarily conserved region of PMCA3. Despite strong genetic evidence for pathogenicity, in vitro analyses of PMCA3R35C function did not show any differences to WT PMCA3. Because Atp2b3 mutation leads to congenital ataxia in humans, the identified Atp2b3 missense change in the shaker rat presents a good candidate for the shaker rat phenotype based on genetic criteria, but cannot yet be considered a definite pathogenic variant owing to lack of functional changes. Summary: The shaker rat mutant: a new model for essential tremors and ataxia characterized by Purkinje cell degeneration.
Collapse
Affiliation(s)
- Karla P Figueroa
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| | - Sharan Paul
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| | - Tito Calì
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | | | - Sukanya Karan
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| | - Martina Frizzarin
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Darren Ames
- Bioinformatics Shared Resource, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA
| | - Ginevra Zanni
- Unit of Molecular Medicine for Neuromuscular and Neurodegenerative Disorders, Department of Neurosciences, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Marisa Brini
- Department of Biology, University of Padova, Padova, Italy
| | - Warunee Dansithong
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| | - Brett Milash
- Bioinformatics Shared Resource, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112, USA
| | - Daniel R Scoles
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| | | | - Stefan M Pulst
- Department of Neurology, University of Utah, Salt Lake City, UT 84112, USA
| |
Collapse
|
17
|
Ribiczey P, Papp B, Homolya L, Enyedi Á, Kovács T. Selective upregulation of the expression of plasma membrane calcium ATPase isoforms upon differentiation and 1,25(OH)2D3-vitamin treatment of colon cancer cells. Biochem Biophys Res Commun 2015; 464:189-94. [DOI: 10.1016/j.bbrc.2015.06.113] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Accepted: 06/17/2015] [Indexed: 11/15/2022]
|
18
|
Strehler EE. Plasma membrane calcium ATPases: From generic Ca(2+) sump pumps to versatile systems for fine-tuning cellular Ca(2.). Biochem Biophys Res Commun 2015; 460:26-33. [PMID: 25998731 DOI: 10.1016/j.bbrc.2015.01.121] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 01/21/2015] [Indexed: 10/23/2022]
Abstract
The plasma membrane calcium ATPases (PMCAs) are ATP-driven primary ion pumps found in all eukaryotic cells. They are the major high-affinity calcium extrusion system for expulsion of Ca(2+) ions from the cytosol and help restore the low resting levels of intracellular [Ca(2+)] following the temporary elevation of Ca(2+) generated during Ca(2+) signaling. Due to their essential role in the maintenance of cellular Ca(2+) homeostasis they were initially thought to be "sump pumps" for Ca(2+) removal needed by all cells to avoid eventual calcium overload. The discovery of multiple PMCA isoforms and alternatively spliced variants cast doubt on this simplistic assumption, and revealed instead that PMCAs are integral components of highly regulated multi-protein complexes fulfilling specific roles in calcium-dependent signaling originating at the plasma membrane. Biochemical, genetic, and physiological studies in gene-manipulated and mutant animals demonstrate the important role played by specific PMCAs in distinct diseases including those affecting the peripheral and central nervous system, cardiovascular disease, and osteoporosis. Human PMCA gene mutations and allelic variants associated with specific disorders continue to be discovered and underline the crucial role of different PMCAs in particular cells, tissues and organs.
Collapse
Affiliation(s)
- Emanuel E Strehler
- Department of Biochemistry and Molecular Biology, Guggenheim 16-11A1, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905, USA.
| |
Collapse
|
19
|
Bernocchi G, Fanizzi FP, De Pascali SA, Piccolini VM, Gasperini C, Insolia V, Bottone MG. Neurotoxic Effects of Platinum Compounds: Studies in vivo on Intracellular Calcium Homeostasis in the Immature Central Nervous System. TOXICS 2015; 3:224-248. [PMID: 29056659 PMCID: PMC5634691 DOI: 10.3390/toxics3020224] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/09/2015] [Accepted: 06/09/2015] [Indexed: 02/08/2023]
Abstract
Platinum compounds cause significant clinical neurotoxicity. Several studies highlight neurological complications especially in paediatric oncology patients with Central Nervous System (CNS) and non-CNS malignancies. To understand the toxicity mechanisms of platinum drugs at cellular and molecular levels in the immature brain, which appears more vulnerable to injury than in the adult one, we compared the effects in vivo of the most used platinum compounds, i.e., cisdichlorodiammineplatinum (cisplatin, cisPt), and the new [Pt(O,O′-acac)(γ-acac)(DMS)] (PtAcacDMS). As models of developing brain areas, we have chosen the cerebellum and hippocampus dentate gyrus. Both areas show the neurogenesis events, from proliferation to differentiation and synaptogenesis, and therefore allow comparing the action of platinum compounds with DNA and non-DNA targets. Here, we focused on the changes in the intracellular calcium homeostasis within CNS architecture, using two immunohistochemical markers, the calcium buffer protein Calbindin and Plasma Membrane Calcium ATPase. From the comparison of the cisPt and PtAcacDMS effects, it emerges how essential the equilibrium and synergy between CB and PMCA1 is or how important the presence of at least one of them is to warrant the morphology and function of nervous tissue and limit neuroarchitecture damages, depending on the peculiar and intrinsic properties of the developing CNS areas.
Collapse
Affiliation(s)
- Graziella Bernocchi
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, via Ferrata 9, 27100 Pavia, Italy.
| | - Francesco P Fanizzi
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Università del Salento, via provinciale Lecce-Monteroni centro Ecotekne, 73100 Lecce, Italy.
| | - Sandra A De Pascali
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Università del Salento, via provinciale Lecce-Monteroni centro Ecotekne, 73100 Lecce, Italy.
| | - Valeria M Piccolini
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, via Ferrata 9, 27100 Pavia, Italy.
| | - Caterina Gasperini
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, via Ferrata 9, 27100 Pavia, Italy.
| | - Violetta Insolia
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, via Ferrata 9, 27100 Pavia, Italy.
| | - Maria Grazia Bottone
- Dipartimento di Biologia e Biotecnologie "L. Spallanzani" Università di Pavia, via Ferrata 9, 27100 Pavia, Italy.
| |
Collapse
|
20
|
Al-Dossary AA, Bathala P, Caplan JL, Martin-DeLeon PA. Oviductosome-Sperm Membrane Interaction in Cargo Delivery: DETECTION OF FUSION AND UNDERLYING MOLECULAR PLAYERS USING THREE-DIMENSIONAL SUPER-RESOLUTION STRUCTURED ILLUMINATION MICROSCOPY (SR-SIM). J Biol Chem 2015; 290:17710-17723. [PMID: 26023236 DOI: 10.1074/jbc.m114.633156] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Indexed: 11/06/2022] Open
Abstract
Oviductosomes ((OVS), exosomes/microvesicles), which deliver the Ca(2+) efflux pump, plasma membrane Ca(2+)ATPase 4 (PMCA4), to sperm are likely to play an important role in sperm fertilizing ability (Al-Dossary, A. A., Strehler, E. E., and Martin-DeLeon, P. A. (2013) PloS one 8, e80181). It is unknown how exosomes/microvesicles deliver transmembrane proteins such as PMCA4 to sperm. Here we define a novel experimental approach for the assessment of the interaction of OVS with sperm at a nanoscale level, using a lipophilic dye (FM4-64FX) and three-dimensional SR/SIM, which has an 8-fold increase in volumetric resolution, compared with conventional confocal microscopy. Coincubation assays detected fusion of prelabeled OVS with sperm, primarily over the head and midpiece. Immunofluorescence revealed oviductosomal delivery of PMCA4a to WT and Pmca4 KO sperm, and also endogenous PMCA4a on the inner acrosomal membrane. Fusion was confirmed by transmission immunoelectron microscopy, showing immunogold particles in OVS, and fusion stalks on sperm membrane. Immunofluorescence colocalized OVS with the αv integrin subunit which, along with CD9, resides primarily on the sperm head and midpiece. In capacitated and acrosome reacted sperm, fusion was significantly (p < 0.001) inhibited by blocking integrin/ligand interactions via antibodies, exogenous ligands (vitronectin and fibronectin), and their RGD recognition motif. Our results provide evidence that receptor/ligand interactions, involving αvβ3 and α5β1integrins on sperm and OVS, facilitate fusion of OVS in the delivery of transmembrane proteins to sperm. The mechanism uncovered is likely to be also involved in cargo delivery of prostasomes, epididymosomes, and uterosomes.
Collapse
Affiliation(s)
- Amal A Al-Dossary
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716
| | - Pradeepthi Bathala
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716
| | - Jeffrey L Caplan
- Department of Biological Sciences, University of Delaware, Newark, Delaware 19716; Delaware Biotechnology Institute, Newark, Delaware 19711
| | | |
Collapse
|
21
|
Ho PWL, Pang SYY, Li M, Tse ZHM, Kung MHW, Sham PC, Ho SL. PMCA4 (ATP2B4) mutation in familial spastic paraplegia causes delay in intracellular calcium extrusion. Brain Behav 2015; 5:e00321. [PMID: 25798335 PMCID: PMC4356846 DOI: 10.1002/brb3.321] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 01/14/2015] [Accepted: 01/16/2015] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Familial spastic paraplegia (FSP) is a heterogeneous group of disorders characterized primarily by progressive lower limb spasticity and weakness. More than 50 disease loci have been described with different modes of inheritance. Recently, we described a novel missense mutation (c.803G>A, p.R268Q) in the plasma membrane calcium ATPase (PMCA4, or ATP2B4) gene in a Chinese family with autosomal dominant FSP. Further to this finding, here we describe the functional effect of this mutation. METHODS As PMCA4 removes cytosolic calcium, we measured transient changes and the time-dependent decay of cytosolic calcium level as visualized by using fura-2 fluorescent dye with confocal microscopy in human SH-SY5Y neuroblastoma cells overexpressing either wild-type or R268Q mutant PMCA4. RESULTS Overexpressing both wild-type and R268Q PMCA4 significantly reduced maximum calcium surge after KCl-induced depolarization as compared with vector control cells. However, cells overexpressing mutant PMCA4 protein demonstrated significantly higher level of calcium surge when compared with wild-type. Furthermore, the steady-state cytosolic calcium concentration in these mutant cells remained markedly higher than the wild-type after SERCA inhibition by thapsigargin. CONCLUSION Our result showed that p.R268Q mutation in PMCA4 resulted in functional changes in calcium homeostasis in human neuronal cells. This suggests that calcium dysregulation may be associated with the pathogenesis of FSP.
Collapse
Affiliation(s)
- Philip Wing-Lok Ho
- Division of Neurology, Department of Medicine, University of Hong Kong Hong Kong, China ; Research Centre of Heart, Brain, Hormone and Healthy Aging, University of Hong Kong Hong Kong, China
| | - Shirley Yin-Yu Pang
- Division of Neurology, Department of Medicine, University of Hong Kong Hong Kong, China
| | - Miaoxin Li
- Department of Psychiatry, University of Hong Kong Hong Kong, China ; Centre for Reproduction, Development and Growth, University of Hong Kong Hong Kong, China ; Centre for Genomic Sciences, University of Hong Kong Hong Kong, China
| | - Zero Ho-Man Tse
- Division of Neurology, Department of Medicine, University of Hong Kong Hong Kong, China
| | - Michelle Hiu-Wai Kung
- Division of Neurology, Department of Medicine, University of Hong Kong Hong Kong, China
| | - Pak-Chung Sham
- Department of Psychiatry, University of Hong Kong Hong Kong, China ; Centre for Reproduction, Development and Growth, University of Hong Kong Hong Kong, China ; Centre for Genomic Sciences, University of Hong Kong Hong Kong, China
| | - Shu-Leong Ho
- Division of Neurology, Department of Medicine, University of Hong Kong Hong Kong, China
| |
Collapse
|
22
|
Brini M, Calì T, Ottolini D, Carafoli E. Neuronal calcium signaling: function and dysfunction. Cell Mol Life Sci 2014; 71:2787-814. [PMID: 24442513 PMCID: PMC11113927 DOI: 10.1007/s00018-013-1550-7] [Citation(s) in RCA: 429] [Impact Index Per Article: 42.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 12/15/2013] [Accepted: 12/30/2013] [Indexed: 01/07/2023]
Abstract
Calcium (Ca(2+)) is an universal second messenger that regulates the most important activities of all eukaryotic cells. It is of critical importance to neurons as it participates in the transmission of the depolarizing signal and contributes to synaptic activity. Neurons have thus developed extensive and intricate Ca(2+) signaling pathways to couple the Ca(2+) signal to their biochemical machinery. Ca(2+) influx into neurons occurs through plasma membrane receptors and voltage-dependent ion channels. The release of Ca(2+) from the intracellular stores, such as the endoplasmic reticulum, by intracellular channels also contributes to the elevation of cytosolic Ca(2+). Inside the cell, Ca(2+) is controlled by the buffering action of cytosolic Ca(2+)-binding proteins and by its uptake and release by mitochondria. The uptake of Ca(2+) in the mitochondrial matrix stimulates the citric acid cycle, thus enhancing ATP production and the removal of Ca(2+) from the cytosol by the ATP-driven pumps in the endoplasmic reticulum and the plasma membrane. A Na(+)/Ca(2+) exchanger in the plasma membrane also participates in the control of neuronal Ca(2+). The impaired ability of neurons to maintain an adequate energy level may impact Ca(2+) signaling: this occurs during aging and in neurodegenerative disease processes. The focus of this review is on neuronal Ca(2+) signaling and its involvement in synaptic signaling processes, neuronal energy metabolism, and neurotransmission. The contribution of altered Ca(2+) signaling in the most important neurological disorders will then be considered.
Collapse
Affiliation(s)
- Marisa Brini
- Department of Biology, University of Padova, Via U.Bassi, 58/b, 35131 Padua, Italy
| | - Tito Calì
- Department of Biology, University of Padova, Via U.Bassi, 58/b, 35131 Padua, Italy
| | - Denis Ottolini
- Department of Biology, University of Padova, Via U.Bassi, 58/b, 35131 Padua, Italy
| | - Ernesto Carafoli
- Venetian Institute for Molecular Medicine (VIMM), Via G.Orus, 2, 35129 Padua, Italy
| |
Collapse
|
23
|
Histone deacetylase inhibitor- and PMA-induced upregulation of PMCA4b enhances Ca2+ clearance from MCF-7 breast cancer cells. Cell Calcium 2014; 55:78-92. [DOI: 10.1016/j.ceca.2013.12.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 12/18/2013] [Accepted: 12/21/2013] [Indexed: 11/23/2022]
|
24
|
Al-Dossary AA, Strehler EE, Martin-DeLeon PA. Expression and secretion of plasma membrane Ca2+-ATPase 4a (PMCA4a) during murine estrus: association with oviductal exosomes and uptake in sperm. PLoS One 2013; 8:e80181. [PMID: 24244642 PMCID: PMC3828235 DOI: 10.1371/journal.pone.0080181] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 10/09/2013] [Indexed: 12/02/2022] Open
Abstract
PMCA4, a membrane protein, is the major Ca2+ efflux pump in murine sperm where its deletion leads to a severe loss of hyperactivated motility and to male infertility. We have previously shown that the PMCA4b splice variant interacts with CASK (Ca2+/CaM-dependent serine kinase) in regulating sperm Ca2+. More recently we detected that PMCA4a isoform, in addition to its presence in testis, is secreted in the epididymal luminal fluid and transferred to sperm. Here we show that Pmca4 mRNA is expressed in both the 4a and 4b variants in the vagina, uterus, and oviduct. Immunofluorescence reveals that PMCA4a is similarly expressed and is elevated during estrus, appearing in the glandular and luminal epithelia. Western analysis detected PMCA4a in all tissues and in the luminal fluids (LF) of the vagina (VLF), uterus (ULF), and the oviduct (OLF) collected during estrus. It was ~9- and 4-fold higher in OLF than in VLF and ULF, and only marginally present in LF collected at metestrus/diestrus. Fractionation of the LF collected at estrus, via ultracentrifugation, revealed that 100% of the PMCA4a resides in the vesicular fraction of the ULF and OLF. Transmission electron microscopy (TEM) revealed that OLF vesicles have an exosomal orientation (with the cytoplasmic-side inward), a size range of 25-100 nm, with the characteristic CD9 biomarker. Thus, we dubbed these vesicles “oviductosomes”, to which PMCA4a was immunolocalized. Incubation of caudal sperm in the combined LF or exosomes resulted in up to a ~3-fold increase of sperm PMCA4a, as detected by flow cytometry, indicating in vitro uptake. Our results are consistent with the increased requirement of Ca2+ efflux in the oviduct. They show for the first time the presence of oviductal exosomes and highlight their role, along with uterosomes and vaginal exosomes, in post-testicular sperm acquisition of PMCA4a which is essential for hyperactivated motility and fertility.
Collapse
Affiliation(s)
- Amal A. Al-Dossary
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America
| | - Emanuel E. Strehler
- Department of Biochemistry, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Patricia A. Martin-DeLeon
- Department of Biological Sciences, University of Delaware, Newark, Delaware, United States of America
- * E-mail:
| |
Collapse
|
25
|
The plasma membrane Ca2+-ATPase2 (PMCA2) is involved in the regulation of Purkinje cell dendritic growth in cerebellar organotypic slice cultures. Neural Plast 2013; 2013:321685. [PMID: 24288624 PMCID: PMC3830849 DOI: 10.1155/2013/321685] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 08/30/2013] [Accepted: 09/03/2013] [Indexed: 11/17/2022] Open
Abstract
Purkinje cells are the principal neurons of the cerebellar cortex and have an extensive and elaborate dendritic tree. Chronic activation of type I metabotropic glutamate receptors inhibits Purkinje cell dendritic growth in organotypic cerebellar slice cultures. This effect is mediated by calcium influx through P/Q-type and T-type Ca2+ channels. We have now studied the role of the plasma membrane Ca2+-ATPase2 (PMCA2), a major calcium extrusion pump, for Purkinje cell dendritic development. We found that PMCA2 is strongly expressed in the plasma membrane and dendritic spines of Purkinje cells in organotypic slice cultures compatible with a role for controlling the local dendritic calcium equilibrium. Inhibition of PMCA2 activity by carboxyeosin resulted in a moderate reduction of Purkinje cell dendritic tree size indicating that the extrusion of calcium by PMCA2 is important for maintaining the dendritic calcium concentration and controlling dendritic growth. When inhibition of PMCA2 was combined with stimulation of type I metabotropic glutamate receptors, it partially rescued dendritic morphology. This protection can be explained by a compensatory inactivation of voltage-gated calcium channels in Purkinje cells after PMCA2 inhibition. Our results demonstrate that PMCA2 activity is an important regulator of the dendritic calcium equilibrium controlling Purkinje cell dendritic growth.
Collapse
|
26
|
Patel R, Al-Dossary AA, Stabley DL, Barone C, Galileo DS, Strehler EE, Martin-DeLeon PA. Plasma membrane Ca2+-ATPase 4 in murine epididymis: secretion of splice variants in the luminal fluid and a role in sperm maturation. Biol Reprod 2013; 89:6. [PMID: 23699388 DOI: 10.1095/biolreprod.113.108712] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Plasma membrane Ca(2+)-ATPase isoform 4 (PMCA4) is the primary Ca(2+) efflux pump in murine sperm, where it regulates motility. In Pmca4 null sperm, motility loss results in infertility. We have shown that murine sperm PMCA4b interacts with Ca(2+)/CaM-dependent serine kinase (CASK) in regulating Ca(2+) homeostasis and motility. However, recent work indicated that the bovine PMCA4a splice variant (missing in testis) is epididymally expressed, along with 4b, and may be transferred to sperm. Here we show, via conventional and in situ RT-PCR, that both the splice variants of Pmca4 mRNA are expressed in murine testis and throughout the epididymis. Immunofluorescence localized PMCA4a to the apical membrane of the epididymal epithelium, and Western analysis not only confirmed its presence but showed for the first time that PMCA4a and PMCA4b are secreted in the epididymal luminal fluid (ELF), from which epididymosomes containing PMCA4a were isolated. Flow cytometry indicated the presence of PMCA4a on mature caudal sperm where it was increased ~5-fold compared to caput sperm (detected by Western blotting) and ~2-fold after incubation in ELF, revealing in vitro uptake and implicating PMCA4a in epididymal sperm maturation. Coimmunoprecipitation using pan-PMCA4 antibodies, revealed that both variants associate with CASK, suggesting their presence in a complex. Because they have different kinetic properties for Ca(2+) transport and different abilities to bind to CASK, our study suggests a mechanism for combining the functional attributes of both PMCA4 variants, leading to heightened efficiency of the pump in the maintenance of Ca(2+) homeostasis, which is crucial for normal motility and male fertility.
Collapse
Affiliation(s)
- Ramkrishna Patel
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | | | | | | | | | | | | |
Collapse
|
27
|
Enhanced Synaptic Inhibition in the Cerebellar Cortex of the Ataxic PMCA2−/− Knockout Mouse. THE CEREBELLUM 2013; 12:667-75. [DOI: 10.1007/s12311-013-0472-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
28
|
Strehler EE. Plasma membrane calcium ATPases as novel candidates for therapeutic agent development. JOURNAL OF PHARMACY & PHARMACEUTICAL SCIENCES : A PUBLICATION OF THE CANADIAN SOCIETY FOR PHARMACEUTICAL SCIENCES, SOCIETE CANADIENNE DES SCIENCES PHARMACEUTIQUES 2013; 16:190-206. [PMID: 23958189 PMCID: PMC3869240 DOI: 10.18433/j3z011] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Plasma membrane Ca2+ ATPases (PMCAs) are highly regulated transporters responsible for Ca2+ extrusion from all eukaryotic cells. Different PMCA isoforms are implicated in various tasks of Ca2+ regulation including bulk Ca2+ transport and localized Ca2+ signaling in specific membrane microdomains. Accumulating evidence shows that loss, mutation or inappropriate expression of different PMCAs is associated with pathologies ranging from hypertension, low bone density and male infertility to hearing loss and cerebellar ataxia. Compared to Ca2+ influx channels, PMCAs have lagged far behind as targets for drug development, mainly due to the lack of detailed understanding of their structure and specific function. This is rapidly changing thanks to integrated efforts combining biochemical, structural, cellular and physiological studies suggesting that selective modulation of PMCA isoforms may be of therapeutic value in the management of different and complex diseases. Both structurally informed rational design and high-throughput small molecule library screenings are promising strategies that are expected to lead to specific and isoform-selective modulators of PMCA function. This short review will provide an overview of the diverse roles played by PMCA isoforms in different cells and tissues and their emerging involvement in pathophysiological processes, summarize recent progress in obtaining structural information on the PMCAs, and discuss current and future strategies to develop specific PMCA inhibitors and activators for potential therapeutic applications.
Collapse
Affiliation(s)
- Emanuel E Strehler
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, MN, USA.
| |
Collapse
|
29
|
The Contribution of the Sodium-Calcium Exchanger (NCX) and Plasma Membrane Ca2+ ATPase (PMCA) to Cerebellar Synapse Function. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 961:251-63. [DOI: 10.1007/978-1-4614-4756-6_21] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
|
30
|
Abstract
Cerebellar Purkinje neurons receive synaptic inputs from three different sources: the excitatory parallel fibre and climbing fibre synapses as well as the inhibitory synapses from molecular layer stellate and basket cells. These three synaptic systems use distinct mechanisms in order to generate Ca(2+) signals that are specialized for specific modes of neurotransmitter release and post-synaptic signal integration. In this review, we first describe the repertoire of Ca(2+) regulatory mechanisms that generate and regulate the amplitude and timing of Ca(2+) fluxes during synaptic transmission and then explore how these mechanisms interact to generate the unique functional properties of each of the Purkinje neuron synapses.
Collapse
|
31
|
Functional contributions of the plasma membrane calcium ATPase and the sodium–calcium exchanger at mouse parallel fibre to Purkinje neuron synapses. Pflugers Arch 2012; 465:319-31. [DOI: 10.1007/s00424-012-1172-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2012] [Revised: 10/17/2012] [Accepted: 10/20/2012] [Indexed: 11/26/2022]
|
32
|
Giacomello M, De Mario A, Scarlatti C, Primerano S, Carafoli E. Plasma membrane calcium ATPases and related disorders. Int J Biochem Cell Biol 2012; 45:753-62. [PMID: 23041476 DOI: 10.1016/j.biocel.2012.09.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 09/20/2012] [Accepted: 09/24/2012] [Indexed: 01/10/2023]
Abstract
The plasma membrane Ca(2+) ATPases (PMCA pumps) cooperate with other transport systems in the plasma membrane and in the organelles in the regulation of cell Ca(2+). They have high Ca(2+) affinity and are thus the fine tuners of cytosolic Ca(2+). They belong to the superfamily of P-type ATPases: their four basic isoforms share the essential properties of the reaction cycle and the general membrane topography motif of 10 transmembrane domains and three large cytosolic units. However they also differ in other important properties, e.g., tissue distribution and regulatory mechanisms. Their chief regulator is calmodulin, that removes their C-terminal cytosolic tail from autoinhibitory binding sites next to the active site of the pump, restoring activity. The number of pump isoforms is increased to over 30 by alternative splicing of the transcripts at a N-terminal site (site A) and at site C within the C-terminal calmodulin binding domain: the splice variants are tissue specific and developmentally regulated. The importance of PMCAs in the maintenance of cellular Ca(2+) homeostasis is underlined by the disease phenotypes, genetic or acquired, caused by their malfunction. Non-genetic PMCA deficiencies have long been considered possible causative factors in disease conditions as important as cancer, hypertension, or neurodegeneration. Those of genetic origin are better characterized: some have now been discovered in humans as well. They concern all four PMCA isoforms, and range from cardiac dysfunctions, to deafness, to hypertension, to cerebellar ataxia.
Collapse
Affiliation(s)
- Marta Giacomello
- Venetian Institute of Molecular Medicine, University of Padova, Padua, Italy
| | | | | | | | | |
Collapse
|
33
|
Dendritic calcium signaling in cerebellar Purkinje cell. Neural Netw 2012; 47:11-7. [PMID: 22985934 DOI: 10.1016/j.neunet.2012.08.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Revised: 07/30/2012] [Accepted: 08/09/2012] [Indexed: 11/24/2022]
Abstract
The Purkinje cells in the cerebellum are unique neurons that generate local and global Ca(2+) signals in response to two types of excitatory inputs, parallel fiber and climbing fiber, respectively. The spatiotemporal distribution and interaction of these synaptic inputs produce complex patterns of Ca(2+) dynamics in the Purkinje cell dendrites. The Ca(2+) signals originate from Ca(2+) influx through voltage-gated Ca(2+) channels and Ca(2+) release from intracellular stores that are mediated by the metabotropic glutamate receptor signaling pathway. These Ca(2+) signals are essential for the induction of various forms of synaptic plasticity and for controlling the input-output relationship of Purkinje cells. In this article we review Ca(2+) signaling in Purkinje cell dendrites.
Collapse
|
34
|
Chen Q, Mahendrasingam S, Tickle JA, Hackney CM, Furness DN, Fettiplace R. The development, distribution and density of the plasma membrane calcium ATPase 2 calcium pump in rat cochlear hair cells. Eur J Neurosci 2012; 36:2302-10. [PMID: 22672315 DOI: 10.1111/j.1460-9568.2012.08159.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Calcium is tightly regulated in cochlear outer hair cells (OHCs). It enters mainly via mechanotransducer (MT) channels and is extruded by the plasma membrane calcium ATPase (PMCA)2 isoform of the PMCA, mutations in which cause hearing loss. To assess how pump expression matches the demands of Ca(2+) homeostasis, the distribution of PMCA2 at different cochlear locations during development was quantified using immunofluorescence and post-embedding immunogold labeling. The PMCA2 isoform was confined to stereociliary bundles, first appearing at the base of the cochlea around post-natal day (P)0 followed by the middle and then the apex by P3, and was unchanged after P8. The developmental appearance matched the maturation of the MT channels in rat OHCs. High-resolution immunogold labeling in adult rats showed that PMCA2 was distributed along the membranes of all three rows of OHC stereocilia at similar densities and at about a quarter of the density in inner hair cell stereocilia. The difference between OHCs and inner hair cells was similar to the ratio of their MT channel resting open probabilities. Gold particle counts revealed no difference in PMCA2 density between low- and high-frequency OHC bundles despite larger MT currents in high-frequency OHCs. The PMCA2 density in OHC stereocilia was determined in low- and high-frequency regions from calibration of immunogold particle counts as 2200/μm(2) from which an extrusion rate of ∼200 ions/s per pump was inferred. The limited ability of PMCA2 to extrude the Ca(2+) load through MT channels may constitute a major cause of OHC vulnerability and high-frequency hearing loss.
Collapse
Affiliation(s)
- Qingguo Chen
- Department of Otolaryngology - Head and Neck Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | | | | | | | | | | |
Collapse
|
35
|
Apical localization of PMCA2w/b is enhanced in terminally polarized MDCK cells. Biochem Biophys Res Commun 2011; 410:322-7. [PMID: 21672522 DOI: 10.1016/j.bbrc.2011.05.147] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 05/31/2011] [Indexed: 11/23/2022]
Abstract
The "w" splice forms of PMCA2 localize to distinct membrane compartments such as the apical membrane of the lactating mammary epithelium, the stereocilia of inner ear hair cells or the post-synaptic density of hippocampal neurons. Previous studies indicated that PMCA2w/b was not fully targeted to the apical domain of MDCK cells but distributed more evenly to the lateral and apical membrane compartments. Overexpression of the apical scaffold protein NHERF2, however, greatly increased the amount of the pump in the apical membrane of these epithelial cells. We generated a stable MDCK cell line expressing non-tagged, full-length PMCA2w/b to further study the localization and function of this protein. Here we demonstrate that PMCA2w/b is highly active and shows enhanced apical localization in terminally polarized MDCK cells grown on semi-permeable filters. Reversible surface biotinylation combined with confocal microscopy of fully polarized cells show that the pump is stabilized in the apical membrane via the apical membrane cytoskeleton with the help of endogenous NHERF2 and ezrin. Disruption of the actin cytoskeleton removed the pump from the apical actin patches without provoking its internalization. Our data suggest that full polarization is a prerequisite for proper positioning of the PMCA2w variants in the apical membrane domain of polarized cells.
Collapse
|
36
|
Inhibition of the plasma membrane Ca2+ pump by CD44 receptor activation of tyrosine kinases increases the action potential afterhyperpolarization in sensory neurons. J Neurosci 2011; 31:2361-70. [PMID: 21325503 DOI: 10.1523/jneurosci.5764-10.2011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The cytoplasmic Ca(2+) clearance rate affects neuronal excitability, plasticity, and synaptic transmission. Here, we examined the modulation of the plasma membrane Ca(2+) ATPase (PMCA) by tyrosine kinases. In rat sensory neurons grown in culture, the PMCA was under tonic inhibition by a member of the Src family of tyrosine kinases (SFKs). Ca(2+) clearance accelerated in the presence of selective tyrosine kinase inhibitors. Tonic inhibition of the PMCA was attenuated in cells expressing a dominant-negative construct or shRNA directed to message for the SFKs Lck or Fyn, but not Src. SFKs did not appear to phosphorylate the PMCA directly but instead activated focal adhesion kinase (FAK). Expression of constitutively active FAK enhanced and dominant-negative or shRNA knockdown of FAK attenuated tonic inhibition. Antisense knockdown of PMCA isoform 4 removed tonic inhibition of Ca(2+) clearance, indicating that FAK acts on PMCA4. The hyaluronan receptor CD44 activates SFK-FAK signaling cascades and is expressed in sensory neurons. Treating neurons with a CD44-blocking antibody or short hyaluronan oligosaccharides, which are produced during injury and displace macromolecular hyaluronan from CD44, attenuated tonic PMCA inhibition. Ca(2+)-activated K(+) channels mediate a slow afterhyperpolarization in sensory neurons that was inhibited by tyrosine kinase inhibitors and enhanced by knockdown of PMCA4. Thus, we describe a novel kinase cascade in sensory neurons that enables the extracellular matrix to alter Ca(2+) signals by modulating PMCA-mediated Ca(2+) clearance. This signaling pathway may influence the excitability of sensory neurons following injury.
Collapse
|
37
|
Mangialavori I, Villamil-Giraldo AM, Pignataro MF, Ferreira-Gomes M, Caride AJ, Rossi JPFC. Plasma membrane calcium pump (PMCA) differential exposure of hydrophobic domains after calmodulin and phosphatidic acid activation. J Biol Chem 2011; 286:18397-404. [PMID: 21454645 DOI: 10.1074/jbc.m110.210088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The exposure of the plasma membrane calcium pump (PMCA) to the surrounding phospholipids was assessed by measuring the incorporation of the photoactivatable phosphatidylcholine analog [(125)I]TID-PC/16 to the protein. In the presence of Ca(2+) both calmodulin (CaM) and phosphatidic acid (PA) greatly decreased the incorporation of [(125)I]TID-PC/16 to PMCA. Proteolysis of PMCA with V8 protease results in three main fragments: N, which includes transmembrane segments M1 and M2; M, which includes M3 and M4; and C, which includes M5 to M10. CaM decreased the level of incorporation of [(125)I]TID-PC/16 to fragments M and C, whereas phosphatidic acid decreased the incorporation of [(125)I]TID-PC/16 to fragments N and M. This suggests that the conformational changes induced by binding of CaM or PA extend to the adjacent transmembrane domains. Interestingly, this result also denotes differences between the active conformations produced by CaM and PA. To verify this point, we measured resonance energy transfer between PMCA labeled with eosin isothiocyanate at the ATP-binding site and the phospholipid RhoPE included in PMCA micelles. CaM decreased the efficiency of the energy transfer between these two probes, whereas PA did not. This result indicates that activation by CaM increases the distance between the ATP-binding site and the membrane, but PA does not affect this distance. Our results disclose main differences between PMCA conformations induced by CaM or PA and show that those differences involve transmembrane regions.
Collapse
Affiliation(s)
- Irene Mangialavori
- Instituto de Química y Fisicoquímica Biologicas, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Junín 956, 1113 Buenos Aires, Argentina
| | | | | | | | | | | |
Collapse
|
38
|
Bravo-Martínez J, Delgado-Coello B, García DE, Mas-Oliva J. Analysis of plasma membrane Ca2+-ATPase gene expression during epileptogenesis employing single hippocampal CA1 neurons. Exp Biol Med (Maywood) 2011; 236:409-17. [PMID: 21444370 DOI: 10.1258/ebm.2011.010342] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Disruption of calcium homeostasis in epileptic cells is characterized by both short- and long-term perturbations of Ca(2+) buffering systems. Along with the Na(+)/Ca(2+) exchanger, the plasma membrane Ca(2+)-ATPase (PMCA) plays an important role in excitable cells. The involvement of PMCAs in epileptogenesis has primarily been studied in brief intervals after various stimuli; however, the specific contribution of this molecule to epileptogenesis is not yet fully understood. Our aim has been to investigate whether PMCA expression in the chronic stages of epilepsy is altered. Through an interdisciplinary approach, involving whole-cell recordings and real-time reverse transcriptase-polymerase chain reaction, we have shown that epileptic neurons in our preparation consistently show changes in electrical properties during the period of chronic epilepsy. These changes included increased spike frequency, altered resting membrane potential and changes in passive membrane properties. Following these observations, which indicate an altered excitability in the epileptic cells studied, PMCA mRNA transcripts were studied. It was found that while PMCA1 transcripts are significantly increased one month following the pilocarpine epileptogenic stimulus, PMCA3, an isoform important in excitable tissues, was significantly, decreased. These findings suggest that, in the long-term, a slow PMCA (PMCA1) plays a role in the reestablishment of a new calcium homeostasis attained by epileptic cells. Overall, this phenomenon points out the fact that in seizure disorders, changes that take place in the balance of the different molecules and their isoforms in charge of maintaining neuronal calcium homeostasis, are fundamental in the survival of affected cells.
Collapse
Affiliation(s)
- Jorge Bravo-Martínez
- Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF México
| | | | | | | |
Collapse
|
39
|
Pande J, Szewczyk MM, Grover AK. Allosteric inhibitors of plasma membrane Ca 2+ pumps: Invention and applications of caloxins. World J Biol Chem 2011; 2:39-47. [PMID: 21537489 PMCID: PMC3083994 DOI: 10.4331/wjbc.v2.i3.39] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 11/18/2010] [Accepted: 11/25/2010] [Indexed: 02/05/2023] Open
Abstract
Plasma membrane Ca2+ pumps (PMCA) play a major role in Ca2+ homeostasis and signaling by extruding cellular Ca2+ with high affinity. PMCA isoforms are encoded by four genes which are expressed differentially in various cell types in normal and disease states. Therefore, PMCA isoform selective inhibitors would aid in delineating their role in physiology and pathophysiology. We are testing the hypothesis that extracellular domains of PMCA can be used as allosteric targets to obtain a novel class of PMCA-specific inhibitors termed caloxins. This review presents the concepts behind the invention of caloxins and our progress in this area. A section is also devoted to the applications of caloxins in literature. We anticipate that isoform-selective caloxins will aid in understanding PMCA physiology in health and disease. With strategies to develop therapeutics from bioactive peptides, caloxins may become clinically useful in cardiovascular diseases, neurological disorders, retinopathy, cancer and contraception.
Collapse
Affiliation(s)
- Jyoti Pande
- Jyoti Pande, Ashok K Grover, Department of Medicine, HSC 4N41, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada
| | | | | |
Collapse
|
40
|
Brandenburger T, Strehler EE, Filoteo AG, Caride AJ, Aumüller G, Post H, Schwarz A, Wilhelm B. Switch of PMCA4 splice variants in bovine epididymis results in altered isoform expression during functional sperm maturation. J Biol Chem 2011; 286:7938-7946. [PMID: 21187283 PMCID: PMC3048680 DOI: 10.1074/jbc.m110.142836] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 11/02/2010] [Indexed: 11/06/2022] Open
Abstract
Ca(2+) and Ca(2+)-dependent signals are essential for sperm maturation and fertilization. In mouse sperm the plasma membrane Ca(2+)-ATPase (PMCA) isoform 4 plays a crucial role in Ca(2+) transport. The two major splice variants of PMCA4 are PMCA4a and PMCA4b. PMCA4a differs from PMCA4b in the mechanism of calmodulin binding and activation. PMCA4a shows a much higher basal activity and is more effective than PMCA4b in returning Ca(2+) to resting levels. Knock-out mice carrying a PMCA4-null mutation are infertile because their sperm cannot achieve a hyperactivated state of motility. As sperm reach functional maturity during their transit through the epididymis, the expression of PMCA4a and 4b was assessed in bull testis and epididymis. Quantitative PCR revealed that PMCA4b is the major splice variant in testis, caput, and corpus epididymidis. In contrast, PMCA4a is the major splice variant in cauda epididymidis, whereas sperm are transcriptionally silent. Immunohistochemical staining using a new antibody against bovine PMCA4a located the PMCA4a to the apical membrane of the epithelium of cauda epididymidis, whereas testis, caput, and corpus epididymidis were negative. Western blotting of testis, epididymis, and sperm isolated from caput and cauda epididymidis showed a much higher level of PMCA4a in cauda epididymidis and sperm from cauda epididymidis compared with testis membranes and sperm from caput epididymidis. These findings suggest that PMCA4a is transferred to bovine sperm membranes in cauda epididymidis. This isoform switch may facilitate a higher calcium turnover in sperm necessary to traverse the female genital tract.
Collapse
Affiliation(s)
- Timo Brandenburger
- From the Department of Anatomy and Cell Biology, Philipps-University, 35037 Marburg, Germany,; the Department of Anesthesiology, University Hospital Düsseldorf, 40225 Düsseldorf, Germany, and.
| | - Emanuel E Strehler
- the Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905
| | - Adelaida G Filoteo
- the Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905
| | - Ariel J Caride
- the Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota 55905
| | - Gerhard Aumüller
- From the Department of Anatomy and Cell Biology, Philipps-University, 35037 Marburg, Germany
| | - Heidi Post
- From the Department of Anatomy and Cell Biology, Philipps-University, 35037 Marburg, Germany
| | - Anja Schwarz
- From the Department of Anatomy and Cell Biology, Philipps-University, 35037 Marburg, Germany
| | - Beate Wilhelm
- From the Department of Anatomy and Cell Biology, Philipps-University, 35037 Marburg, Germany
| |
Collapse
|
41
|
Kenyon KA, Bushong EA, Mauer AS, Strehler EE, Weinberg RJ, Burette AC. Cellular and subcellular localization of the neuron-specific plasma membrane calcium ATPase PMCA1a in the rat brain. J Comp Neurol 2010; 518:3169-83. [PMID: 20575074 PMCID: PMC2894304 DOI: 10.1002/cne.22409] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Regulation of intracellular calcium is crucial both for proper neuronal function and survival. By coupling ATP hydrolysis with Ca(2+) extrusion from the cell, the plasma membrane calcium-dependent ATPases (PMCAs) play an essential role in controlling intracellular calcium levels in neurons. In contrast to PMCA2 and PMCA3, which are expressed in significant levels only in the brain and a few other tissues, PMCA1 is ubiquitously distributed, and is thus widely believed to play a "housekeeping" function in mammalian cells. Whereas the PMCA1b splice variant is predominant in most tissues, an alternative variant, PMCA1a, is the major form of PMCA1 in the adult brain. Here, we use immunohistochemistry to analyze the cellular and subcellular distribution of PMCA1a in the brain. We show that PMCA1a is not ubiquitously expressed, but rather is confined to neurons, where it concentrates in the plasma membrane of somata, dendrites, and spines. Thus, rather than serving a general housekeeping function, our data suggest that PMCA1a is a calcium pump specialized for neurons, where it may contribute to the modulation of somatic and dendritic Ca(2+) transients.
Collapse
Affiliation(s)
- Katharine A Kenyon
- Department of Cell and Developmental Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA
| | | | | | | | | | | |
Collapse
|
42
|
Padányi R, Xiong Y, Antalffy G, Lór K, Pászty K, Strehler EE, Enyedi A. Apical scaffolding protein NHERF2 modulates the localization of alternatively spliced plasma membrane Ca2+ pump 2B variants in polarized epithelial cells. J Biol Chem 2010; 285:31704-12. [PMID: 20663896 DOI: 10.1074/jbc.m110.164137] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The membrane localization of the plasma membrane Ca(2+)-ATPase isoform 2 (PMCA2) in polarized cells is determined by alternative splicing; the PMCA2w/b splice variant shows apical localization, whereas the PMCA2z/b and PMCA2x/b variants are mostly basolateral. We previously reported that PMCA2b interacts with the PDZ protein Na(+)/H(+) exchanger regulatory factor 2 (NHERF2), but the role of this interaction for the specific membrane localization of PMCA2 is not known. Here we show that co-expression of NHERF2 greatly enhanced the apical localization of GFP-tagged PMCA2w/b in polarized Madin-Darby canine kidney cells. GFP-PMCA2z/b was also redirected to the apical membrane by NHERF2, whereas GFP-PMCA2x/b remained exclusively basolateral. In the presence of NHERF2, GFP-PMCA2w/b co-localized with the actin-binding protein ezrin even after disruption of the actin cytoskeleton by cytochalasin D or latrunculin B. Surface biotinylation and fluorescence recovery after photobleaching experiments demonstrated that NHERF2-mediated anchorage to the actin cytoskeleton reduced internalization and lateral mobility of the pump. Our results show that the specific interaction with NHERF2 enhances the apical concentration of PMCA2w/b by anchoring the pump to the apical membrane cytoskeleton. The data also suggest that the x/b splice form of PMCA2 contains a dominant lateral targeting signal, whereas the targeting and localization of the z/b form are more flexible and not fully determined by intrinsic sequence features.
Collapse
Affiliation(s)
- Rita Padányi
- Department of Molecular Cell Biology, National Blood Center, H-1113 Budapest, Hungary
| | | | | | | | | | | | | |
Collapse
|
43
|
Burette AC, Strehler EE, Weinberg RJ. A plasma membrane Ca2+ ATPase isoform at the postsynaptic density. Neuroscience 2010; 169:987-93. [PMID: 20678993 DOI: 10.1016/j.neuroscience.2010.05.062] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 05/24/2010] [Accepted: 05/26/2010] [Indexed: 11/26/2022]
Abstract
Most excitatory input in the hippocampus impinges on dendritic spines. Entry of Ca(2+) into spines through NMDA receptors can trigger a sequence of biochemical reactions leading to sustained changes in synaptic efficacy. To provide specificity, dendritic spines restrict the diffusion of Ca(2+) signaling and downstream molecules. The postsynaptic density (PSD) (the most prominent subdomain within the spine) is the site of Ca(2+) entry through NMDA receptors. We here demonstrate that Ca(2+) can also be removed via pumps embedded in the PSD. Using light- and electron-microscopic immunohistochemistry, we find that PMCA2w, a member of the plasma membrane Ca(2+)-ATPase (PMCA) family, concentrates at the PSD of most hippocampal spines. We propose that PMCA2w may be recruited into supramolecular complexes at the postsynaptic density, thus helping to regulate Ca(2+) nanodomains at subsynaptic sites. Taken together, these results suggest a novel function for PMCAs as modulators of Ca(2+) signaling at the synapse.
Collapse
Affiliation(s)
- A C Burette
- Department of Cell and Developmental Biology, University of North Carolina at Chapel Hill, 314 Taylor Hall, CB# 7090, Chapel Hill, NC 27599, USA.
| | | | | |
Collapse
|
44
|
Huang H, Nagaraja RY, Garside ML, Akemann W, Knöpfel T, Empson RM. Contribution of plasma membrane Ca 2+ ATPase to cerebellar synapse function. World J Biol Chem 2010; 1:95-102. [PMID: 21540995 PMCID: PMC3083959 DOI: 10.4331/wjbc.v1.i5.95] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 05/17/2010] [Accepted: 05/20/2010] [Indexed: 02/05/2023] Open
Abstract
The cerebellum expresses one of the highest levels of the plasma membrane Ca2+ ATPase, isoform 2 in the mammalian brain. This highly efficient plasma membrane calcium transporter protein is enriched within the main output neurons of the cerebellar cortex; i.e. the Purkinje neurons (PNs). Here we review recent evidence, including electrophysiological and calcium imaging approaches using the plasma membrane calcium ATPase 2 (PMCA2) knockout mouse, to show that PMCA2 is critical for the physiological control of calcium at cerebellar synapses and cerebellar dependent behaviour. These studies have also revealed that deletion of PMCA2 throughout cerebellar development in the PMCA2 knockout mouse leads to permanent signalling and morphological alterations in the PN dendrites. Whilst these findings highlight the importance of PMCA2 during cerebellar synapse function and development, they also reveal some limitations in the use of the PMCA2 knockout mouse and the need for additional experimental approaches including cell-specific and reversible manipulation of PMCAs.
Collapse
Affiliation(s)
- Helena Huang
- Helena Huang, Raghavendra Y Nagaraja, Ruth M Empson, Department of Physiology, Brain Health and Repair Research Centre, University of Otago, Dunedin, 9001, New Zealand
| | | | | | | | | | | |
Collapse
|
45
|
Empson RM, Turner PR, Nagaraja RY, Beesley PW, Knöpfel T. Reduced expression of the Ca(2+) transporter protein PMCA2 slows Ca(2+) dynamics in mouse cerebellar Purkinje neurones and alters the precision of motor coordination. J Physiol 2010; 588:907-22. [PMID: 20083513 DOI: 10.1113/jphysiol.2009.182196] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Cerebellar Purkinje neurones (PNs) express high levels of the plasma membrane calcium ATPase, PMCA2, a transporter protein critical for the clearance of calcium from excitable cells. Genetic deletion of one PMCA2 encoding gene in heterozygous PMCA2 knock-out (PMCA2(+/-) mice enabled us to determine how PMCA2 influences PN calcium regulation without the complication of the severe morphological changes associated with complete PMCA2 knock-out (PMCA2(-/-) in these cells. The PMCA2(+/-) cerebellum expressed half the normal levels of PMCA2 and this nearly doubled the time taken for PN dendritic calcium transients to recover (mean fast and slow recovery times increased from 70 ms to 110 ms and from 600 ms to 1100 ms). The slower calcium recovery had distinct consequences for PMCA2(+/-) PN physiology. The PNs exhibited weaker climbing fibre responses, prolonged outward Ca(2+)-dependent K(+) current (mean fast and slow recovery times increased from 136 ms to 192 ms and from 595 ms to 1423 ms) and a slower mean frequency of action potential firing (7.4 Hz compared with 15.8 Hz). Our findings were consistent with prolonged calcium accumulation in the cytosol of PMCA2(+/-) Purkinje neurones. Although PMCA2(+/-) mice exhibited outwardly normal behaviour and little change in their gait pattern, when challenged to run on a narrow beam they exhibited clear deficits in hindlimb coordination. Training improved the motor performance of both PMCA2(+/-) and wild-type mice, although PMCA2(+/-) mice were always impaired. We conclude that reduced calcium clearance perturbs calcium dynamics in PN dendrites and that this is sufficient to disrupt the accuracy of cerebellar processing and motor coordination.
Collapse
Affiliation(s)
- Ruth M Empson
- University of Otago, Physiology, 270 Great King Street, Dunedin 9001, New Zealand.
| | | | | | | | | |
Collapse
|
46
|
Zaidi A, Fernandes D, Bean JL, Michaelis ML. Effects of paraquat-induced oxidative stress on the neuronal plasma membrane Ca(2+)-ATPase. Free Radic Biol Med 2009; 47:1507-14. [PMID: 19715754 PMCID: PMC2789485 DOI: 10.1016/j.freeradbiomed.2009.08.018] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 08/17/2009] [Accepted: 08/20/2009] [Indexed: 12/25/2022]
Abstract
Oxidative stress leads to the disruption of calcium homeostasis in brain neurons; however, the direct effects of oxidants on proteins that regulate intracellular calcium ([Ca(2+)](i)) are not known. The calmodulin (CaM)-stimulated plasma membrane Ca(2+)-ATPase (PMCA) plays a critical role in regulating [Ca(2+)](i). Our previous in vitro studies showed that PMCA present in brain synaptic membranes is readily inactivated by a variety of reactive oxygen species (ROS). The present studies were conducted to determine the vulnerability of PMCA to ROS generated in neurons as would probably occur in vivo. Primary cortical neurons were exposed to paraquat (PQ), a redox cycling agent that generates intracellular ROS. Low concentrations of PQ (5-10 microM) increased PMCA basal activity by two-fold but abolished its sensitivity to CaM. Higher concentrations (25-100 microM) inhibited both components of PMCA activity. Immunoblots showed the formation of high-molecular-weight PMCA aggregates. Additionally, PMCA showed evidence of proteolytic degradation. PMCA proteolysis was prevented by a calpain inhibitor, suggesting a role for calpain. Our findings suggest that PMCA is a sensitive target of oxidative stress in primary neurons. Inactivation of this Ca(2+) transporter under prolonged oxidative stress could alter neuronal Ca(2+) signaling.
Collapse
Affiliation(s)
- Asma Zaidi
- Department of Pharmacology and Toxicology, University of Kansas, Lawrence, KS 66045, USA.
| | | | | | | |
Collapse
|
47
|
Ontogeny of ATP hydrolysis and isoform expression of the plasma membrane Ca(2+)-ATPase in mouse brain. BMC Neurosci 2009; 10:112. [PMID: 19735545 PMCID: PMC2749858 DOI: 10.1186/1471-2202-10-112] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 09/07/2009] [Indexed: 11/20/2022] Open
Abstract
Background Plasma membrane Ca2+-ATPases (PMCAs) are high affinity Ca2+ transporters actively involved in intracellular Ca2+ homeostasis. Considering the critical role of Ca2+ signalling in neuronal development and plasticity, we have analyzed PMCA-mediated Ca2+-ATPase activity and PMCA-isoform content in membranes from mouse cortex, hippocampus and cerebellum during postnatal development. Results PMCA activity was detected from birth, with a faster evolution in cortex than in hippocampus and cerebellum. Western blots revealed the presence of the four isoforms in all regions, with similar increase in their expression patterns as those seen for the activity profile. Immunohistochemistry assays in cortex and hippocampus showed co-expression of all isoforms in the neuropil associated with synapses and in the plasma membrane of pyramidal cells soma, while cerebellum showed a more isoform-specific distribution pattern in Purkinje cells. Conclusion These results show an upregulation of PMCA activity and PMCA isoforms expression during brain development in mouse, with specific localizations mainly in cerebellum. Overall, our findings support a close relationship between the ontogeny of PMCA isoforms and specific requirements of Ca2+ during development of different brain areas.
Collapse
|
48
|
Iizuka N, Suzuki A, Nozawa-Inoue K, Kawano Y, Nandasena BGTL, Okiji T, Maeda T. Differential cell-specific location of Cav-1 and Ca(2+)-ATPase in terminal Schwann cells and mechanoreceptive Ruffini endings in the periodontal ligament of the rat incisor. J Anat 2009; 214:267-74. [PMID: 19207988 DOI: 10.1111/j.1469-7580.2008.01029.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Caveolae are involved in clathrin-independent endocytosis, transcytosis, signal transduction, and tumor suppression - all of which depend on their main constituent protein caveolin families. The periodontal Ruffini ending has been reported to develop a caveola-like structure on the cell membrane of both the axon terminals and Schwann sheaths, suggesting the existence of an axon-Schwann cell interaction in the periodontal Ruffini endings. However, little information is available concerning the functional significance of these caveolae. The present study was undertaken to examine the immunolocalization of caveolin-1, -3 (Cav-1, Cav-3) and Ca(2+)-ATPase in the periodontal Ruffini endings of the rat incisor. Decalcified sections of the upper jaws were processed for immunocytochemistry at the levels of light and electron microscopy. Some immunostained sections were treated with histochemistry for nonspecific cholinesterase (nChE) activity. Observations showed the periodontal Ruffini endings were immunopositive for Cav-1, but not Cav-3. Immunoreactive products for Cav-1 were confined to caveola-like structures in the cell membranes of the cytoplasmic extensions and cell bodies of the terminal Schwann cells associated with the periodontal Ruffini endings. However, the axonal membranes of the terminals did not express any Cav-1 immunoreaction. Double staining with Ca(2+)-ATPase and either protein gene product 9.5 (PGP 9.5) or S-100 protein disclosed the co-localization of immunoreactions in the axonal branches of the periodontal Ruffini endings, but not in the terminal Schwann cells. As Ca(2+) plays an important role in mechanotransduction, these characteristic immunolocalizations show Cav-1/Ca(2+)-ATPase might be involved in the quick elimination of intracellular Ca(2+) in mechanotransduction.
Collapse
Affiliation(s)
- Naoyuki Iizuka
- Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | | | | | | | | | | | | |
Collapse
|
49
|
Molecular interactions of the plasma membrane calcium ATPase 2 at pre- and post-synaptic sites in rat cerebellum. Neuroscience 2009; 162:383-95. [PMID: 19406213 DOI: 10.1016/j.neuroscience.2009.04.059] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 04/05/2009] [Accepted: 04/24/2009] [Indexed: 11/23/2022]
Abstract
The plasma membrane calcium extrusion mechanism, PMCA (plasma membrane calcium ATPase) isoform 2 is richly expressed in the brain and particularly the cerebellum. Whilst PMCA2 is known to interact with a variety of proteins to participate in important signalling events [Strehler EE, Filoteo AG, Penniston JT, Caride AJ (2007) Plasma-membrane Ca(2+) pumps: structural diversity as the basis for functional versatility. Biochem Soc Trans 35 (Pt 5):919-922], its molecular interactions in brain synapse tissue are not well understood. An initial proteomics screen and a biochemical fractionation approach identified PMCA2 and potential partners at both pre- and post-synaptic sites in synapse-enriched brain tissue from rat. Reciprocal immunoprecipitation and GST pull-down approaches confirmed that PMCA2 interacts with the post-synaptic proteins PSD95 and the NMDA glutamate receptor subunits NR1 and NR2a, via its C-terminal PDZ (PSD95/Dlg/ZO-1) binding domain. Since PSD95 is a well-known partner for the NMDA receptor this raises the exciting possibility that all three interactions occur within the same post-synaptic signalling complex. At the pre-synapse, where PMCA2 was present in the pre-synapse web, reciprocal immunoprecipitation and GST pull-down approaches identified the pre-synaptic membrane protein syntaxin-1A, a member of the SNARE complex, as a potential partner for PMCA2. Both PSD95-PMCA2 and syntaxin-1A-PMCA2 interactions were also detected in the molecular and granule cell layers of rat cerebellar sagittal slices by immunohistochemistry. These specific molecular interactions at cerebellar synapses may allow PMCA2 to closely control local calcium dynamics as part of pre- and post-synaptic signalling complexes.
Collapse
|
50
|
Burette AC, Strehler EE, Weinberg RJ. "Fast" plasma membrane calcium pump PMCA2a concentrates in GABAergic terminals in the adult rat brain. J Comp Neurol 2009; 512:500-13. [PMID: 19025983 DOI: 10.1002/cne.21909] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The plasma membrane Ca(2+)-ATPases (PMCA) represent the major high-affinity Ca(2+) extrusion system in the brain. PMCAs comprise four isoforms and over 20 splice variants. Their different functional properties may permit different PMCA splice variants to accommodate different kinds of local [Ca(2+)] transients, but for a specific PMCA to play a unique role in local Ca(2+) handling it must be targeted to the appropriate subcellular compartment. We used immunohistochemistry to study the spatial distribution of PMCA2a-one of the two major carboxyl-terminal splice variants of PMCA2-in the adult rat brain, testing whether this isoform, with especially high basal activity, is targeted to specific subcellular compartments. In striking contrast to the widespread distribution of PMCA2 as a whole, we found that PMCA2a is largely restricted to parvalbumin-positive inhibitory presynaptic terminals throughout the brain. The only major exception to this targeting pattern was in the cerebellar cortex, where PMCA2a also concentrates postsynaptically, in the spines of Purkinje cells. We propose that the fast Ca(2+) activation kinetics and high V(max) of PMCA2a make this pump especially suited for rapid clearance of presynaptic Ca(2+) in fast-spiking inhibitory nerve terminals, which face severe transient calcium loads.
Collapse
Affiliation(s)
- Alain C Burette
- Department of Cell and Developmental Biology, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
| | | | | |
Collapse
|