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Proteau S, Krossa I, Husser C, Guéguinou M, Sella F, Bille K, Irondelle M, Dalmasso M, Barouillet T, Cheli Y, Pisibon C, Arrighi N, Nahon‐Estève S, Martel A, Gastaud L, Lassalle S, Mignen O, Brest P, Mazure NM, Bost F, Baillif S, Landreville S, Turcotte S, Hasson D, Carcamo S, Vandier C, Bernstein E, Yvan‐Charvet L, Levesque MP, Ballotti R, Bertolotto C, Strub T. LKB1-SIK2 loss drives uveal melanoma proliferation and hypersensitivity to SLC8A1 and ROS inhibition. EMBO Mol Med 2023; 15:e17719. [PMID: 37966164 PMCID: PMC10701601 DOI: 10.15252/emmm.202317719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 10/16/2023] [Accepted: 10/23/2023] [Indexed: 11/16/2023] Open
Abstract
Metastatic uveal melanomas are highly resistant to all existing treatments. To address this critical issue, we performed a kinome-wide CRISPR-Cas9 knockout screen, which revealed the LKB1-SIK2 module in restraining uveal melanoma tumorigenesis. Functionally, LKB1 loss enhances proliferation and survival through SIK2 inhibition and upregulation of the sodium/calcium (Na+ /Ca2+ ) exchanger SLC8A1. This signaling cascade promotes increased levels of intracellular calcium and mitochondrial reactive oxygen species, two hallmarks of cancer. We further demonstrate that combination of an SLC8A1 inhibitor and a mitochondria-targeted antioxidant promotes enhanced cell death efficacy in LKB1- and SIK2-negative uveal melanoma cells compared to control cells. Our study also identified an LKB1-loss gene signature for the survival prognostic of patients with uveal melanoma that may be also predictive of response to the therapy combination. Our data thus identify not only metabolic vulnerabilities but also new prognostic markers, thereby providing a therapeutic strategy for particular subtypes of metastatic uveal melanoma.
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Affiliation(s)
- Sarah Proteau
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Imène Krossa
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Chrystel Husser
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | | | - Federica Sella
- Department of Dermatology, University Hospital ZurichUniversity of ZurichZurichSwitzerland
| | - Karine Bille
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | | | - Mélanie Dalmasso
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Thibault Barouillet
- Inserm, Hematometabolism and metainflammation, team 13, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Yann Cheli
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Céline Pisibon
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Nicole Arrighi
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Sacha Nahon‐Estève
- University Côte d'AzurNiceFrance
- Department of OphthalmologyCentre Hospitalier Universitaire of NiceNiceFrance
| | - Arnaud Martel
- University Côte d'AzurNiceFrance
- Department of OphthalmologyCentre Hospitalier Universitaire of NiceNiceFrance
| | | | - Sandra Lassalle
- University Côte d'AzurNiceFrance
- Laboratory of Clinical and Experimental Pathology, University Hospital of Nice, FHU OncoAge, Cote d'Azur University, Biobank BB‐0033‐00025, IRCAN team 4, OncoAge FHUNiceFrance
| | | | - Patrick Brest
- University Côte d'AzurNiceFrance
- IRCAN team 4, Inserm, CNRS, FHU‐oncoAge, IHU‐RESPIRera NiceNiceFrance
| | - Nathalie M Mazure
- University Côte d'AzurNiceFrance
- Inserm, Cancer, Metabolism and environment, team, Equipe labellisée Ligue 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Frédéric Bost
- University Côte d'AzurNiceFrance
- Inserm, Cancer, Metabolism and environment, team, Equipe labellisée Ligue 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Stéphanie Baillif
- University Côte d'AzurNiceFrance
- Department of OphthalmologyCentre Hospitalier Universitaire of NiceNiceFrance
| | - Solange Landreville
- Département d'ophtalmologie et d'ORL‐CCF, Faculté de médecineUniversité LavalQuebec CityQCCanada
- CUO‐Recherche and Axe médecine régénératriceCentre de recherche du CHU de Québec‐Université LavalQuebec CityQCCanada
- Centre de recherche sur le cancer de l'Université LavalQuebec CityQCCanada
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEXQuebec CityQCCanada
| | - Simon Turcotte
- Cancer AxisCentre de recherche du Centre Hospitalier de l'Université de Montréal/Institut du cancer de MontréalMontréalQCCanada
- Hepato‐Pancreato‐Biliary Surgery and Liver Transplantation ServiceCentre hospitalier de l'Université de MontréalMontréalQCCanada
| | - Dan Hasson
- Department of Oncological Sciences, Tisch Cancer InstituteIcahn School of Medicine at Mount SinaiNew YorkNYUSA
- Tisch Cancer Institute Bioinformatics for Next Generation Sequencing (BiNGS) FacilityIcahn School of Medicine at Mount SinaiNew YorkNYUSA
| | - Saul Carcamo
- Department of Oncological Sciences, Tisch Cancer InstituteIcahn School of Medicine at Mount SinaiNew YorkNYUSA
- Tisch Cancer Institute Bioinformatics for Next Generation Sequencing (BiNGS) FacilityIcahn School of Medicine at Mount SinaiNew YorkNYUSA
| | | | - Emily Bernstein
- Department of Oncological Sciences, Tisch Cancer InstituteIcahn School of Medicine at Mount SinaiNew YorkNYUSA
| | - Laurent Yvan‐Charvet
- University Côte d'AzurNiceFrance
- Inserm, Hematometabolism and metainflammation, team 13, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Mitchell P Levesque
- Department of Dermatology, University Hospital ZurichUniversity of ZurichZurichSwitzerland
| | - Robert Ballotti
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Corine Bertolotto
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
| | - Thomas Strub
- University Côte d'AzurNiceFrance
- Inserm, Biology and Pathologies of melanocytes, team1, Equipe labellisée Ligue 2020, and Equipe labellisée ARC 2022, Mediterranean Centre for Molecular MedicineNiceFrance
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Rousseau E, Proteau S. Functional properties of the native type 3 ryanodine receptor Ca2+-release channel from canine diaphragm. Can J Physiol Pharmacol 2001; 79:310-9. [PMID: 11332508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
mRNA and protein analyses have previously shown that the diaphragm expresses two ryanodine receptor isoforms: RyR1 and RyR3. RyR1 is the main Ca2+-releasing pathway in this muscle type. We now report the conducting, gating, and immunological properties of the native and purified forms of the less abundant RyR3 channel. The conductance of this native Ca2+-release channel was 330 pS in 50 mM/250 mM trans/cis CsCH3SO3. It was activated by Ca2+ concentrations of 1-1000 microM, and did not inactivate at mM concentrations of Ca2+. Both isoforms were purified by either a sucrose density gradient or immunoprecipitation as > 450 kDa proteins on SDS-PAGE. Western blot analysis confirmed the presence of RyR1 and RyR3, which displayed conductances of 740 +/- 30 and 800 +/- 25 pS, respectively, in 250 mM KCl. We thus provide evidence that one form of the diaphragm SR Ca2+-release channels may be classified as RyR3, with gating properties different from those of the well-characterized RyR1 and RyR2 isoforms.
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Affiliation(s)
- E Rousseau
- Department of Physiology and Biophysics, Faculty of Medicine, Unversit é de Sherbrooke, QC, Canada.
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Côté K, Proteau S, Teijeira J, Rousseau E. Characterization of the sarcoplasmic reticulum k(+) and Ca(2+)-release channel-ryanodine receptor-in human atrial cells. J Mol Cell Cardiol 2000; 32:2051-63. [PMID: 11040108 DOI: 10.1006/jmcc.2000.1236] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Since the role of sarcoplasmic reticulum (SR) in the E-C coupling of mammalian atrial cells has long been a subject of debate, biochemical, electrophysiological and immunological assays were performed in order to define and compare the properties of the Ca(2+)-release channel-ryanodine receptor (RyR)-from atrial and ventricular tissues. Cardiac SR preparations from human, canine and ovine tissues were compared using [(3)H]ryanodine binding, channel reconstitution into planar lipid bilayers and Western blot analysis involving RyR antibodies. [(3)H]ryanodine binding assays revealed a K(d)value of; 2.5 n M for all investigated cardiac tissues. Bound [(3)H]ryanodine was Ca(2+)-dependent with similar EC(50)values of 0.43, 0.49 and 0.79 microM for human atrium, canine ventricle and ovine atrium, respectively. However the density of binding sites was 4.5 times lower in atrial than in ventricular tissues. Beyond the presence of selective K(+)channels (gamma=188 pS) recorded in the SR enriched fraction of human atrium, the activity of a large conducting (gamma=671 pS) cationic channel was also observed. The latter displayed typical characteristics of Ca(2+)-release channels which were activated by 10 microM free [Ca(2+)] and 2 m M ATP. Western blot analysis revealed the presence of the RyR2 isoform in atrial and ventricular samples whereas no immunoreactivity was detected with specific RyR1 and RyR3 antibodies. Our results, obtained at the molecular level, are consistent with the presence of functional SR in human atrial cells. The human atrial Ca(2+)-release channel displays binding and regulating properties typical of the RyR2 isoform.
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Affiliation(s)
- K Côté
- Le Bilarium, Département de Physiologie et Biophysique, Université de Sherbrooke, Sherbrooke, QC, Canada
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Abstract
Nuclear ionic channels (NICs) represent ubiquitous structures of living cells, although little is known about their functional properties and encoding genes. To characterize NICs, liver nuclear membrane vesicles were reconstituted into either planar lipid bilayers or proteoliposomes. Reconstitution of nuclear envelope (NE) vesicles into planar lipid bilayer proceeded with low efficiency. NE vesicle reconstitution into proteoliposomes led to NIC observations by the patch-clamp technique. Large conductance, voltage-gated, K(+)-permeant and Cl(-)-permeant NICs were characterized. An 80-105-pS K(+)-permeant NIC with conducting sub-state was also recorded. Our data establish that NICs can be characterized upon reconstitution into giant proteoliposomes and retain biophysical properties consistent with those described for native NICs.
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Affiliation(s)
- G Guihard
- INSER U533, Hôtel-Dieu, Nantes, France.
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Lugnier C, Keravis T, Le Bec A, Pauvert O, Proteau S, Rousseau E. Characterization of cyclic nucleotide phosphodiesterase isoforms associated to isolated cardiac nuclei. Biochim Biophys Acta 1999; 1472:431-46. [PMID: 10564757 DOI: 10.1016/s0304-4165(99)00145-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The identity and location of nuclear cyclic nucleotide phosphodiesterases (PDE) has yet to be ascertained. Intact cardiac nuclei and subnuclear fractions from ovine hearts were isolated to determine cAMP-specific PDE activity which was 3-fold greater than that of cGMP PDE, the latter being insensitive to Ca-calmodulin and zaprinast. Specific hydrolytic activities of the cardiac nuclear envelopes (NE) were similar to those measured in the corresponding intact nuclei, thus suggesting that most PDE activity is associated with the nuclear membrane. Moreover, the main hydrolytic activities in cardiac nuclei were attributed to PDE4 (56%) and PDE3 (44%). The pharmacological sensitivity of each isoform in terms of IC(50), K(m) and K(i) values was typical of previously characterized cardiac PDE 3 and 4 isoforms. PDE2 (cGMP-stimulated PDE) represented a minor component (8-9%) of total hydrolytic activity. Solubilization of nuclear envelopes and HPLC separation also yielded rolipram-sensitive PDE activities. Upon 1% Triton X-100 extractions, the presence of PDE3 and PDE4 was revealed in a low speed, nucleopore complex-enriched, P1 pellet. In addition, Western blot analysis demonstrated the presence of PDE4B and PDE4D subtypes in the nuclei as well as enrichment in NE. However, in the same preparations, the presence of PDE4A could not be ascertained. Altogether, these results suggest an intrinsic and predominant association of these nuclear PDEs with the NE and much likely with nucleopore complexes.
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Affiliation(s)
- C Lugnier
- Laboratoire de Pharmacologie et de Physico-chimie des Interactions Cellulaires et Moléculaires, CNRS-UMR, Université Louis Pasteur de Strasbourg, 67401, Illkirch, France
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Picher M, Decrouy A, Proteau S, Rousseau E. Conducting and voltage-dependent behaviors of the native and purified SR Ca2+-release channels from the canine diaphragm. Biochim Biophys Acta 1997; 1328:243-60. [PMID: 9315621 DOI: 10.1016/s0005-2736(97)00104-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The ryanodine-sensitive Ca2+-release channel of the canine diaphragm sarcoplasmic reticulum (SR) was characterized using biochemical assays and the planar lipid bilayer technique. Diaphragm SR membranes have a [3H]ryanodine-binding capacity (Bmax) of 1.2 pmol/mg protein and a binding affinity (K(D)) of 6.3 nM. The conductance of the native channel was 330 pS in 50 mM/250 mM trans/cis CsCH3SO3 and was reduced to 71 pS by 10 mM Ca2+ trans. The Ca2+-release channel was purified as a 400 kDa protein on SDS-PAGE and displayed a conductance of 715 pS in 200 mM KCl. The native and purified Ca2+ channels were activated by micromolar Ca2+ and ATP and inhibited by Mg2+, ryanodine and ruthenium red. Although diaphragm muscle contraction was shown to depend on extracellular Ca2+ like cardiac muscles, we provide evidence that the diaphragm SR Ca2+-release channel may be classified as a skeletal ryanodine receptor isoform. First, the IC50 for [3H]ryanodine binding was in the same range as estimated for skeletal SR, with 20 nM. Second, the channel was maximally activated by 10-30 microM cytoplasmic Ca2+ and inhibited at higher concentrations. Third, ryanodine binding to the diaphragm SR was less sensitive to Ca2+ than cardiac SR, with EC50, values of 50 and 1 microM, respectively. Finally, Ca2+-release activity and [3H]ryanodine binding capacity of the diaphragm and skeletal SR were similarly more sensitive to Mg2+ than cardiac SR. Together, these results suggest a predominantly skeletal-type of excitation-contraction coupling in the diaphragm.
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Affiliation(s)
- M Picher
- Department of Physiology and Biophysics, Faculty of Medicine, University of Sherbrooke, QC, Canada
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Abstract
The nuclear envelope is composed of two membranes deliminating a perinuclear space which displays functional properties similar to those of a Ca2+-storing compartment. ATP-driven Ca2+ uptake and InsP3-induced Ca2+ release processes have been described in isolated nuclei. Recently, it was reported that cADP-ribose and InsP3 can trigger a nucleoplasmic Ca2+ increase. It was hypothesized that the inner nuclear membrane possesses Ca2+ channels that are regulated by ryanodine or InsP3. Radio-ligand binding assays and Western blot experiments were performed in order to investigate their presence in sheep cardiac and rat liver nuclear envelopes. Ryanodine receptors (RyR) were not detected in liver nuclear envelopes by either binding assay or Western blot analysis. However, cardiac nuclear envelopes were found to retain a very low level of specific ryanodine binding, which was not detected on immuno-blots obtained with three types of isoform-specific RyR antibodies. In contrast, nuclear InsP3-binding sites were consistently detected in both cardiac and liver nuclear envelopes. Altogether, these results provide evidence for the major contributor InsP3-gated Ca2+ channels in control of Ca2+ release from the perinuclear space in liver and cardiac cells.
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Affiliation(s)
- G Guihard
- Département de Physiologie et Biophysique, Faculté de Médecine, Université de Sherbrooke, QC, Canada
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Decrouy A, Juteau M, Proteau S, Teijiera J, Rousseau E. Biochemical regulation of sarcoplasmic reticulum Cl- channel from human atrial myocytes: involvement of phospholamban. J Mol Cell Cardiol 1996; 28:767-80. [PMID: 8732504 DOI: 10.1006/jmcc.1996.0071] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Sarcoplasmic reticulum (SR) membrane vesicles derived from human atrium were characterized by specific ryanodine binding assay and fused into planar lipid bilayers. The tritiated form of the alkaloid bound to its receptor with a K(D) of 2.2 nM and a Bmax of 268 fmol/mg protein respectively. Special emphasis was placed on an anion-selective channel present in the SR membrane, which exhibited a mean conductance value of 67 pS when recorded in asymmetrical 50 mM trans/250 mM cis CsCl buffer system and a sensitivity to SITS (1 to 100 microM). Single and multiple channel activities displayed low voltage sensitivity and variability in its gating behavior which might result in spontaneous channel inactivation. However, the majority of the recordings (60%) resulted in a steady-state high open probability. The inactivated channel could be transiently reactivated with depolarizing voltage steps. This behavior is very similar, if not identical, to that observed for the SR Cl- channel in ventricular cells. The inactivation process is probably not directly related to a phosphorylation/dephosphorylation mechanism since PKA and PKG in presence of an adequate phosphorylation cocktail failed to reactivate the SR Cl- channel. In contrast, the use of a monoclonal anti-phospholamban antibody allowed the inhibition of the activity of the anionic channels. These results suggest that the regulation of the human atrial SR Cl- channel is dependent upon an interaction with phospholamban, which was clearly identified in our atrial preparations by Western blot analysis using monoclonal antibody.
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Affiliation(s)
- A Decrouy
- Department of Physiology and Biophysics, Faculty of Medicine, University of Sherbrooke, Quebec, Canada
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Abstract
Recent reports suggest that the nuclear envelope possesses specific ion transport mechanisms that regulate the electrolyte concentrations within the nucleoplasm and perinuclear space. In this work, intact nuclei were isolated from sheep cardiac cells. After chromatin digestion, the nuclear envelopes were sonicated and four nuclear vesicle populations were separated by sucrose step gradients (SF1-SF4). These fractions were compared by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and their protein content was analyzed by Western blot, using lamin and SEC 61 antibodies. The lamins, which are associated with the inner nuclear membrane, were present in three fractions, SF2, SF3, and SF4, with a lower amount in SF2. The SEC 61 protein, a marker of the rough endoplasmic reticulum, was detected in small amounts in SF1 and SF2. Upon fusion of vesicles into bilayers, the activities of nuclear ionic channels were recorded in 50 mM trans/250 mM cis KCl or CsCl, pH 7.2. Two types of Cl- selective channels were recorded: a large conducting 150-180-pS channel displaying substates, and a low conducting channel of 30 pS. They were both spontaneously active into bilayers, and their open probability was poorly voltage dependent at negative voltages. Retinoic acid (10(-8) M) increases the po of the large Cl- conducting channel, whereas ATP modifies the kinetics of the low conductance anion selective channel. Our data also suggest that this anionic channel is mainly present in the SF3 and SF4 population. The presence of a 181 +/- 10 pS cation-selective channel was consistently observed in the SF2 population. The behavior of this channel was voltage dependent in the voltage range -80 to +60 mV. Furthermore, we report for the first time the activity of a channel exclusively present in the SF3 and SF4 fractions, shown to contain mainly inner membrane vesicles. This cation selective channel displays a 75-pS conductance in 50 mM trans/250 mM cis K-gluconate. It is concluded that the bilayer reconstitution technique is an attractive approach to studying the electrophysiological properties of the inner and outer membranes of the nuclear envelope.
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Affiliation(s)
- E Rousseau
- Department of Physiology and Biophysics, University of Sherbrooke, Québec J1H 5N4, Canada.
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