1
|
Djemai M, Jalouli M, Chahine M. Impacts of DCM-linked gating pore currents on the electrophysiological characteristics of hiPSC-CM monolayers. Biochem Biophys Res Commun 2024; 723:150175. [PMID: 38820625 DOI: 10.1016/j.bbrc.2024.150175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2024] [Revised: 05/20/2024] [Accepted: 05/24/2024] [Indexed: 06/02/2024]
Abstract
BACKGROUND Variants of the SCN5A gene, which encodes the NaV1.5 cardiac sodium channel, have been linked to arrhythmic disorders associated with dilated cardiomyopathy (DCM). However, the precise pathological mechanisms remain elusive. The present study aimed to elucidate the pathophysiological consequences of the DCM-linked Nav1.5/R219H variant, which is known to generate a gating pore current, using patient-specific human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) cultured in monolayers. METHODS Ventricular- and atrial-like hiPSC-CM monolayers were generated from DCM patients carrying the R219H SCN5A variant as well as from healthy control individuals. CRISPR-corrected hiPSC-CMs served as isogenic controls. Simultaneous optical mapping of action potentials (APs) and calcium transients (CaTs) was employed to measure conduction velocities (CVs) and AP durations (APDs) and served as markers of electrical excitability. Calcium handling was evaluated by assessing CaT uptake (half-time to peak), recapture (tau of decay), and durations (TD50 and TD80). A multi-electrode array (MEA) analysis was conducted on hiPSC-CM monolayers to measure field potential (FP) parameters, including corrected Fridericia FP durations (FPDc). RESULTS Our results revealed that CVs were significantly reduced by more than 50 % in both ventricular- and atrial-like hiPSC-CM monolayers carrying the R219H variant compared to the control group. APDs were also prolonged in the R219H group compared to the control and CRISPR-corrected groups. CaT uptake, reuptake, and duration were also markedly delayed in the R219H group compared to the control and CRISPR-corrected groups in both the ventricular- and the atrial-like hiPSC-CM monolayers. Lastly, the MEA data revealed a notably prolonged FPDc in the ventricular- and atrial-like hiPSC-CMs carrying the R219H variant compared to the control and isogenic control groups. CONCLUSIONS These findings highlight the impact of the gating pore current on AP propagation and calcium homeostasis within a functional syncytium environment and offer valuable insights into the potential mechanisms underlying DCM pathophysiology.
Collapse
Affiliation(s)
| | - Maroua Jalouli
- Department of Biology, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia
| | - Mohamed Chahine
- CERVO Brain Research Centre, Quebec City, Quebec, Canada; Department of Medicine, Faculty of Medicine, Université Laval, Quebec City, Quebec, Canada.
| |
Collapse
|
2
|
Pásek M, Bébarová M, Šimurdová M, Šimurda J. Functional consequences of changes in the distribution of Ca 2+ extrusion pathways between t-tubular and surface membranes in a model of human ventricular cardiomyocyte. J Mol Cell Cardiol 2024; 193:113-124. [PMID: 38960316 DOI: 10.1016/j.yjmcc.2024.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 06/10/2024] [Accepted: 06/29/2024] [Indexed: 07/05/2024]
Abstract
The sarcolemmal Ca2+ efflux pathways, Na+-Ca2+-exchanger (NCX) and Ca2+-ATPase (PMCA), play a crucial role in the regulation of intracellular Ca2+ load and Ca2+ transient in cardiomyocytes. The distribution of these pathways between the t-tubular and surface membrane of ventricular cardiomyocytes varies between species and is not clear in human. Moreover, several studies suggest that this distribution changes during the development and heart diseases. However, the consequences of NCX and PMCA redistribution in human ventricular cardiomyocytes have not yet been elucidated. In this study, we aimed to address this point by using a mathematical model of the human ventricular myocyte incorporating t-tubules, dyadic spaces, and subsarcolemmal spaces. Effects of various combinations of t-tubular fractions of NCX and PMCA were explored, using values between 0.2 and 1 as reported in animal experiments under normal and pathological conditions. Small variations in the action potential duration (≤ 2%), but significant changes in the peak value of cytosolic Ca2+ transient (up to 17%) were observed at stimulation frequencies corresponding to the human heart rate at rest and during activity. The analysis of model results revealed that the changes in Ca2+ transient induced by redistribution of NCX and PMCA were mainly caused by alterations in Ca2+ concentrations in the subsarcolemmal spaces and cytosol during the diastolic phase of the stimulation cycle. The results suggest that redistribution of both transporters between the t-tubular and surface membranes contributes to changes in contractility in human ventricular cardiomyocytes during their development and heart disease and may promote arrhythmogenesis.
Collapse
Affiliation(s)
- Michal Pásek
- Institute of Thermomechanics, Czech Academy of Sciences, Prague, Czech Republic; Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
| | - Markéta Bébarová
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic; Department of Internal Medicine and Cardiology, University Hospital Brno and Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Milena Šimurdová
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Jiří Šimurda
- Department of Physiology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| |
Collapse
|
3
|
Wang JZ, Li XY, Zhang M, Xiao Y, Chen L, Deng MY, Huang S, Zhou XL. Synthesis and biological evaluation of lycoctonine derivatives with cardiotonic and calcium channels inhibitory activities. Bioorg Chem 2024; 146:107297. [PMID: 38503027 DOI: 10.1016/j.bioorg.2024.107297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/13/2024] [Accepted: 03/15/2024] [Indexed: 03/21/2024]
Abstract
In our previous study, a screening of a variety of lycotonine-type diterpenoid alkaloids were screened for cardiotonic activity revealed that lycoctonine had moderate cardiac effect. In this study, a series of structurally diverse of lycoctonine were synthesized by modifying on B-ring, D-ring, E-ring, F-ring, N-atom or salt formation on lycoctonine skeleton. We evaluated the cardiotonic activity of the derivatives by isolated frog heart, aiming to identify some compounds with significantly enhanced cardiac effects, among which compound 27 with a N-isobutyl group emerged as the most promising cardiotonic candidate. Furthermore, the cardiotonic mechanism of compound 27 was preliminarily investigated. The result suggested that the cardiotonic effect of compound 27 is related to calcium channels. Patch clamp technique confirmed that the compound 27 had inhibitory effects on CaV1.2 and CaV3.2, with inhibition rates of 78.52 % ± 2.26 % and 79.05 % ± 1.59 % at the concentration of 50 μM, respectively. Subsequently, the protective effect of 27 on H9c2 cells injury induced by cobalt chloride was tested. In addition, compound 27 can alleviate CoCl2-induced myocardial injury by alleviating calcium overload. These findings suggest that compound 27 was a new structural derived from lycoctonine, which may serve as a new lead compound for the treatment of heart failure.
Collapse
Affiliation(s)
- Jian-Zhu Wang
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China
| | - Xiang-Yu Li
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China
| | - Min Zhang
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China; Yibin Institute of Southwest Jiaotong University, Yibin, Sichuan, PR China
| | - Yan Xiao
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China
| | - Lin Chen
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China
| | - Meng-Yi Deng
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China; Yibin Institute of Southwest Jiaotong University, Yibin, Sichuan, PR China
| | - Shuai Huang
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China; Yibin Institute of Southwest Jiaotong University, Yibin, Sichuan, PR China.
| | - Xian-Li Zhou
- School of Life Science and Engineering Southwest, Jiaotong University, Chengdu, Sichuan, PR China; Yibin Institute of Southwest Jiaotong University, Yibin, Sichuan, PR China.
| |
Collapse
|
4
|
Prosperi S, D’Amato A, Severino P, Myftari V, Monosilio S, Marchiori L, Zagordi LM, Filomena D, Di Pietro G, Birtolo LI, Badagliacca R, Mancone M, Maestrini V, Vizza CD. Sizing SGLT2 Inhibitors Up: From a Molecular to a Morpho-Functional Point of View. Int J Mol Sci 2023; 24:13848. [PMID: 37762152 PMCID: PMC10530908 DOI: 10.3390/ijms241813848] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 08/30/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Sodium-glucose cotransporter 2 inhibitors (SGLT2i), or gliflozins, have recently been shown to reduce cardiovascular death and hospitalization in patients with heart failure, representing a revolutionary therapeutic tool. The purpose of this review is to explore their multifaceted mechanisms of actions, beyond their known glucose reduction power. The cardioprotective effects of gliflozins seem to be linked to the maintenance of cellular homeostasis and to an action on the main metabolic pathways. They improve the oxygen supply for cardiomyocytes with a considerable impact on both functional and morphological myocardial aspects. Moreover, multiple molecular actions of SGLT2i are being discovered, such as the reduction of both inflammation, oxidative stress and cellular apoptosis, all responsible for myocardial damage. Various studies showed controversial results concerning the role of SGLT2i in reverse cardiac remodeling and the lowering of natriuretic peptides, suggesting that their overall effect has yet to be fully understood. In addition to this, advanced imaging studies evaluating the effect on all four cardiac chambers are lacking. Further studies will be needed to better understand the real impact of their administration, their use in daily practice and how they can contribute to benefits in terms of reverse cardiac remodeling.
Collapse
Affiliation(s)
| | - Andrea D’Amato
- Correspondence: ; Tel.: +39-06-49979021; Fax: +39-06-49979060
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Li X, Zhang Y, Zhao Y, Zhou Y, Han Q, Yang Y, Zhang L, Shi L, Jin X, Zhang R, Gao H, Xue G, Li D, Zhang ZR, Lu Y, Yang B, Pan Z. Cullin-associated and neddylation-dissociated 1 protein (CAND1) governs cardiac hypertrophy and heart failure partially through regulating calcineurin degradation. Pharmacol Res 2022; 182:106284. [PMID: 35661710 DOI: 10.1016/j.phrs.2022.106284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/16/2022] [Accepted: 05/29/2022] [Indexed: 11/19/2022]
Abstract
Pathological cardiac hypertrophy is a process characterized by significant disturbance of protein turnover. Cullin-associated and Neddylation-dissociated 1 (CAND1) acts as a coordinator to modulate substrate protein degradation by promoting the formation of specific cullin-based ubiquitin ligase 3 complex in response to substrate accumulation, which thereby facilitate the maintaining of normal protein homeostasis. Accumulation of calcineurin is critical in the pathogenesis of cardiac hypertrophy and heart failure. However, whether CAND1 titrates the degradation of hypertrophy related protein eg. calcineurin and regulates cardiac hypertrophy remains unknown. Therefore, we aim to explore the role of CAND1 in cardiac hypertrophy and heart failure and the underlying molecular mechanism. Here, we found that the protein level of CAND1 was increased in cardiac tissues from heart failure (HF) patients and TAC mice, whereas the mRNA level did not change. CAND1-KO+/- aggravated TAC-induced cardiac hypertrophic phenotypes; in contrast, CAND1-Tg attenuated the maladaptive cardiac remodeling. At the molecular level, CAND1 overexpression downregulated, whereas CAND1-KO+/- or knockdown upregulated calcineurin expression at both in vivo and in vitro conditions. Mechanistically, CAND1 overexpression favored the assembly of Cul1/atrogin1/calcineurin complex and rendered the ubiquitination and degradation of calcineurin. Notably, CAND1 deficiency-induced hypertrophic phenotypes were partially rescued by knockdown of calcineurin, and application of exogenous CAND1 prevented TAC-induced cardiac hypertrophy. Taken together, our findings demonstrate that CAND1 exerts a protective effect against cardiac hypertrophy and heart failure partially by inducing the degradation of calcineurin.
Collapse
Affiliation(s)
- Xingda Li
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Yang Zhang
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Yue Zhao
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Yang Zhou
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Qilong Han
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Ying Yang
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Lingmin Zhang
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Ling Shi
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Xuexin Jin
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Ruixin Zhang
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Haiyu Gao
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Genlong Xue
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Desheng Li
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China
| | - Zhi-Ren Zhang
- Institute of Metabolic Disease, Heilongjiang Academy of Medical Science, Harbin, China; Departments of Cardiology and Clinical Pharmacy, Harbin Medical University Cancer Hospital, Heilongjiang Academy of Medical Science, Harbin, China; NHC Key Laboratory of Cell Transplantation, Harbin Medical University, Harbin, China
| | - Yanjie Lu
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China; Research Unit of Noninfectious Chronic Diseases in Frigid Zone, Chinese Academy of Medical Sciences, 2019RU070, China
| | - Baofeng Yang
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China; Research Unit of Noninfectious Chronic Diseases in Frigid Zone, Chinese Academy of Medical Sciences, 2019RU070, China.
| | - Zhenwei Pan
- Department of Pharmacology, Key Laboratory of Cardiovascular Research, Ministry of Education, College of Pharmacy, Harbin Medical University, Harbin 150086, China; Research Unit of Noninfectious Chronic Diseases in Frigid Zone, Chinese Academy of Medical Sciences, 2019RU070, China; NHC Key Laboratory of Cell Transplantation, Harbin Medical University, Harbin, China.
| |
Collapse
|
6
|
Abstract
Heart failure (HF) continues to be a serious public health challenge despite significant advancements in therapeutics and is often complicated by multiple other comorbidities. Of particular concern is type 2 diabetes mellitus (T2DM) which not only amplifies the risk, but also limits the treatment options available to patients. The sodium-glucose linked cotransporter subtype 2 (SGLT2)-inhibitor class, which was initially developed as a treatment for T2DM, has shown great promise in reducing cardiovascular risk, particularly around HF outcomes - regardless of diabetes status.There are ongoing efforts to elucidate the true mechanism of action of this novel drug class. Its primary mechanism of inducing glycosuria and diuresis from receptor blockade in the renal nephron seems unlikely to be responsible for the rapid and striking benefits seen in clinical trials. Early mechanistic work around conventional therapeutic targets seem to be inconclusive. There are some emerging theories around its effect on myocardial energetics and calcium balance as well as on renal physiology. In this review, we discuss some of the cutting-edge hypotheses and concepts currently being explored around this drug class in an attempt better understand the molecular mechanics of this novel agent.
Collapse
Affiliation(s)
- Amir Fathi
- Department of Neuroanaesthesia and Critical Care, National Hospital for Neurology and Neurosurgery, University College London, London, UK
| | - Keeran Vickneson
- Division of Molecular and Clinical Medicine, School of Medicine, University of Dundee, Dundee, UK
| | - Jagdeep S Singh
- Division of Molecular and Clinical Medicine, School of Medicine, University of Dundee, Dundee, UK.
- Department of Cardiology, The Edinburgh Heart Center, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh, EH16 4SA, UK.
| |
Collapse
|
7
|
Truong KM, Feng W, Pessah IN. Ryanodine Receptor Type 2: A Molecular Target for Dichlorodiphenyltrichloroethane- and Dichlorodiphenyldichloroethylene-Mediated Cardiotoxicity. Toxicol Sci 2020; 178:159-172. [PMID: 32894766 PMCID: PMC7850024 DOI: 10.1093/toxsci/kfaa139] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Dichlorodiphenyltrichloroethane (DDT) and its metabolite dichlorodiphenyl-dichloroethylene (DDE) are ubiquitously found in the environment and linked to cardiovascular diseases-with a majority of the work focused on hypertension. Studies investigating whether DDx can interact with molecular targets on cardiac tissue to directly affect cardiac function are lacking. Therefore, we investigated whether o,p'-DDT, p,p'-DDT, o,p'-DDE, or p,p'-DDE (DDx, collectively) can directly alter the function of human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) by assessing their effect(s) on hiPSC-CMs Ca2+ dynamics. DDx (0.1-10 µM) affected hiPSC-CMs synchronous Ca2+ oscillation frequency in a concentration-dependent manner, with p,p'-DDT and p,p'-DDE also decreasing Ca2+ stores. HEK-RyR2 cells cultured under antibiotic selection to induce expression of wild-type mouse ryanodine receptor type 2 (RyR2) are used to further investigate whether DDx alters hiPSC-CMs Ca2+ dynamics through engagement with RyR2, a protein critical for cardiac muscle excitation-contraction coupling (ECC). Acute treatment with 10 µM DDx failed to induce Ca2+ release in HEK293-RyR2, whereas pretreatment with DDx (0.1-10 µM) for 12- or 24-h significantly decreased sarcoplasmic reticulum Ca2+ stores in HEK-RyR2 cells challenged with caffeine (1 mM), an RyR agonist. [3H]ryanodine-binding analysis using murine cardiac RyR2 homogenates further confirmed that all DDx isomers (10 µM) can directly engage with RyR2 to favor an open (leaky) confirmation, whereas only the DDT isomers (10 µM) modestly (≤10%) inhibited SERCA2a activity. The data demonstrate that DDx increases heart rate and depletes Ca2+ stores in human cardiomyocytes through a mechanism that impairs RyR2 function and Ca2+ dynamics. IMPACT STATEMENT DDT/DDE interactions with RyR2 alter cardiomyocyte Ca2+ dynamics that may contribute to adverse cardiovascular outcomes associated with exposures.
Collapse
Affiliation(s)
- Kim M Truong
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, California 95616-5270
| | - Wei Feng
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, California 95616-5270
| | - Isaac N Pessah
- To whom correspondence should be addressed at Department of Molecular Biosciences, School of Veterinary Medicine, University of California, 1089 Veterinary Medicine Drive, Davis, CA 95616. E-mail:
| |
Collapse
|
8
|
Beghi S, Cavaliere F, Buschini A. Gene polymorphisms in calcium-calmodulin pathway: Focus on cardiovascular disease. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2020; 786:108325. [PMID: 33339582 DOI: 10.1016/j.mrrev.2020.108325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 07/22/2020] [Accepted: 07/24/2020] [Indexed: 12/30/2022]
Abstract
Cardiovascular disease is the leading cause of death in industrialized countries and affects an increasing number of people. Several risk factors play an important role in the etiology of this disease, such as an unhealthy lifestyle. It is increasingly clear that genetic factors influencing the molecular basis of excitation-contraction mechanisms in the heart could contribute to modify the individual's risk. Thanks to the progress that has been made in understanding calcium signaling in the heart, it is assumed that calmodulin can play a crucial role in the excitation-contraction coupling. In fact, calmodulin (CaM) binds calcium and consequently regulates calcium channels. Several works show how some polymorphic variants can be considered predisposing factors to complex pathologies. Therefore, we hypothesize that the identification of polymorphic variants of proteins involved in the CaM pathway could be important for understanding how genetic traits can influence predisposition to myocardial infarction. This review considers each pathway of the three different isoforms of calmodulin (CaM1; CaM2; CaM3) and focuses on some common proteins involved in the three pathways, with the aim of analyzing the polymorphisms studied in the literature and understanding if they are associated with cardiovascular disease.
Collapse
Affiliation(s)
- Sofia Beghi
- University of Parma, Department of Chemistry, Life Sciences and Environmental Sustainability, Parco Area Delle Scienze 11A, 43124, Parma, Italy
| | - Francesca Cavaliere
- University of Parma, Department of Food and Drug, Parco Area Delle Scienze 17A, 43124, Parma, Italy
| | - Annamaria Buschini
- University of Parma, Department of Chemistry, Life Sciences and Environmental Sustainability, Parco Area Delle Scienze 11A, 43124, Parma, Italy.
| |
Collapse
|
9
|
Loescher CM, Gibson LM, Stephenson DG. Dantrolene sodium increases calcium binding by human recombinant cardiac calsequestrin and calcium loading by sheep cardiac sarcoplasmic reticulum. Acta Physiol (Oxf) 2019; 226:e13261. [PMID: 30710413 DOI: 10.1111/apha.13261] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 01/08/2019] [Accepted: 01/23/2019] [Indexed: 12/15/2022]
Abstract
AIM Dantrolene interacts with ryanodine receptors in skeletal and cardiac muscle affecting sarcoplasmic reticulum calcium release. Since dantrolene is lipophilic it could also affect intra-sarcoplasmic reticulum calcium handling proteins such as calsequestrin. This study investigated whether dantrolene (1-30 µmol/L) alters the polymerization state and the calcium binding capacity of recombinant cardiac calsequestrin and cardiac sarcoplasmic reticulum calcium handling. METHODS Human recombinant cardiac calsequestrin was used to make simultaneous measurements of turbidity (to indicate calsequestrin polymerization) and calcium binding to calsequestrin in the presence and absence of dantrolene. Caffeine-induced Ca2+ transients were used to investigate the effects of dantrolene on sarcoplasmic reticulum calcium loading and release in saponin-permeabilized cardiomyocytes laid down in monolayers in 96-well array plates. RESULTS Dantrolene (1-30 µmol/L) increased the polymerization state of calsequestrin and its calcium binding capacity. In the presence of dantrolene, calsequestrin-dependent turbidity increased 2.5-11.5-fold at 1.0 mmol/L calcium added to unbuffered Ca2+ solutions and 3-10-fold when calcium was raised from 0.06 to 30 µmol/L. The dantrolene-dependent increase in turbidity at 30 µmol/L dantrolene was associated with a 3-fold increase in the number of calcium ions bound per calsequestrin molecule at 30 and 100 µmol/L calcium. The caffeine-induced releasable calcium loaded by the sarcoplasmic reticulum at 0.63 µmol/L free calcium in permeabilized cardiomyocytes was also increased in the presence of 30 µmol/L dantrolene. CONCLUSION Dantrolene alters the polymerization state and the calcium binding properties of cardiac calsequestrin and increases sarcoplasmic reticulum calcium loading in permeabilized cardiomyocytes.
Collapse
Affiliation(s)
| | - Lynne Michelle Gibson
- Department of Pharmacy and Applied Sciences, La Trobe Institute for Molecular Sciences La Trobe University Bendigo Victoria Australia
| | | |
Collapse
|
10
|
Milic J, Tian Y, Bernhagen J. Role of the COP9 Signalosome (CSN) in Cardiovascular Diseases. Biomolecules 2019; 9:biom9060217. [PMID: 31195722 PMCID: PMC6628250 DOI: 10.3390/biom9060217] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 06/02/2019] [Accepted: 06/03/2019] [Indexed: 12/19/2022] Open
Abstract
The constitutive photomorphogenesis 9 (COP9) signalosome (CSN) is an evolutionarily conserved multi-protein complex, consisting of eight subunits termed CSN1-CSN8. The main biochemical function of the CSN is the control of protein degradation via the ubiquitin-proteasome-system through regulation of cullin-RING E3-ligase (CRL) activity by deNEDDylation of cullins, but the CSN also serves as a docking platform for signaling proteins. The catalytic deNEDDylase (isopeptidase) activity of the complex is executed by CSN5, but only efficiently occurs in the three-dimensional architectural context of the complex. Due to its positioning in a central cellular pathway connected to cell responses such as cell-cycle, proliferation, and signaling, the CSN has been implicated in several human diseases, with most evidence available for a role in cancer. However, emerging evidence also suggests that the CSN is involved in inflammation and cardiovascular diseases. This is both due to its role in controlling CRLs, regulating components of key inflammatory pathways such as nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), and complex-independent interactions of subunits such as CSN5 with inflammatory proteins. In this case, we summarize and discuss studies suggesting that the CSN may have a key role in cardiovascular diseases such as atherosclerosis and heart failure. We discuss the implicated molecular mechanisms ranging from inflammatory NF-κB signaling to proteotoxicity and necrosis, covering disease-relevant cell types such as myeloid and endothelial cells or cardiomyocytes. While the CSN is considered to be disease-exacerbating in most cancer entities, the cardiovascular studies suggest potent protective activities in the vasculature and heart. The underlying mechanisms and potential therapeutic avenues will be critically discussed.
Collapse
Affiliation(s)
- Jelena Milic
- Chair of Vascular Biology, Institute for Stroke and Dementia Research (ISD), Klinikum der Universität München (KUM), Ludwig-Maximilians-University (LMU), 81377 Munich, Germany.
| | - Yuan Tian
- Chair of Vascular Biology, Institute for Stroke and Dementia Research (ISD), Klinikum der Universität München (KUM), Ludwig-Maximilians-University (LMU), 81377 Munich, Germany.
| | - Jürgen Bernhagen
- Chair of Vascular Biology, Institute for Stroke and Dementia Research (ISD), Klinikum der Universität München (KUM), Ludwig-Maximilians-University (LMU), 81377 Munich, Germany.
- Munich Heart Alliance, 80802 Munich, Germany.
- Munich Cluster for Systems Neurology (SyNergy), 81377 Munich, Germany.
| |
Collapse
|
11
|
Calcium Dynamics as a Machine for Decoding Signals. Trends Cell Biol 2018; 28:258-273. [PMID: 29409699 DOI: 10.1016/j.tcb.2018.01.002] [Citation(s) in RCA: 164] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 01/05/2018] [Accepted: 01/10/2018] [Indexed: 11/22/2022]
Abstract
Calcium (Ca2+) is considered one of the most-important biological cations, because it is implicated in cell physiopathology and cell fate through a finely tuned signaling system. In support of this notion, Ca2+ is the primary driver of cell proliferation and cell growth; however, it is also intimately linked to cell death. Functional abnormalities or mutations in proteins that mediate Ca2+ homeostasis usually lead to a plethora of diseases and pathogenic states, including cancer, heart failure, diabetes, and neurodegenerative disease. In this review, we examine recent discoveries in the highly localized nature of Ca2+-dependent signal transduction and its roles in cell fate, inflammasome activation, and synaptic transmission.
Collapse
|