1
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Marabelli C, Santiago DJ, Priori SG. The Structural-Functional Crosstalk of the Calsequestrin System: Insights and Pathological Implications. Biomolecules 2023; 13:1693. [PMID: 38136565 PMCID: PMC10741413 DOI: 10.3390/biom13121693] [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: 10/30/2023] [Revised: 11/14/2023] [Accepted: 11/21/2023] [Indexed: 12/24/2023] Open
Abstract
Calsequestrin (CASQ) is a key intra-sarcoplasmic reticulum Ca2+-handling protein that plays a pivotal role in the contraction of cardiac and skeletal muscles. Its Ca2+-dependent polymerization dynamics shape the translation of electric excitation signals to the Ca2+-induced contraction of the actin-myosin architecture. Mutations in CASQ are linked to life-threatening pathological conditions, including tubular aggregate myopathy, malignant hyperthermia, and Catecholaminergic Polymorphic Ventricular Tachycardia (CPVT). The variability in the penetrance of these phenotypes and the lack of a clear understanding of the disease mechanisms associated with CASQ mutations pose a major challenge to the development of effective therapeutic strategies. In vitro studies have mainly focused on the polymerization and Ca2+-buffering properties of CASQ but have provided little insight into the complex interplay of structural and functional changes that underlie disease. In this review, the biochemical and structural natures of CASQ are explored in-depth, while emphasizing their direct and indirect consequences for muscle Ca2+ physiology. We propose a novel functional classification of CASQ pathological missense mutations based on the structural stability of the monomer, dimer, or linear polymer conformation. We also highlight emerging similarities between polymeric CASQ and polyelectrolyte systems, emphasizing the potential for the use of this paradigm to guide further research.
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Affiliation(s)
- Chiara Marabelli
- Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy;
- Laboratory of Molecular Cardiology, IRCCS ICS Maugeri, 27100 Pavia, Italy
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
| | - Demetrio J. Santiago
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
| | - Silvia G. Priori
- Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy;
- Laboratory of Molecular Cardiology, IRCCS ICS Maugeri, 27100 Pavia, Italy
- Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain;
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2
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Li Q, Niu Z, Nan X, Wang E. An AIE-Active probe for detection and bioimaging of pH values based on lactone hydrolysis reaction. J Fluoresc 2022; 32:1611-1617. [PMID: 35593957 DOI: 10.1007/s10895-022-02967-6] [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: 03/20/2022] [Accepted: 05/05/2022] [Indexed: 11/24/2022]
Abstract
Cellular pH homeostasis is essential for many physiological and pathological processes. pH monitoring is helpful for the diagnosis, treatment and prevention of disorders and diseases. Herein, we developed a ratiometric fluorescent pH probe (TCC) based on a coumarin derivative containing a highly active lactone ring. TCC exhibited a typical AIE effect and emitted blue fluorescence under weak acidic condition. When under weak basic condition, the active lactone moiety underwent a hydrolysis reaction to afford a water-soluble product, which gave red-shifted emission. The emission color change from blue through cyan and then to yellow within pH 6.5-9.0 which is approximate to the biological pH range. And the fluorescence color change along with pH value is reversible. Furthermore, TCC was successfully utilized in the detection of the intracellular pH change of live HeLa cells, which indicated that TCC had practical potential in biomedical research.
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Affiliation(s)
- Qiao Li
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry & Chemical Engineering, Hainan normal University, 571158, Haikou, China
| | - Zhigang Niu
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry & Chemical Engineering, Hainan normal University, 571158, Haikou, China
| | - Xuying Nan
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry & Chemical Engineering, Hainan normal University, 571158, Haikou, China
| | - Enju Wang
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Key Laboratory of Tropical Medicinal Plant Chemistry of Hainan Province, College of Chemistry & Chemical Engineering, Hainan normal University, 571158, Haikou, China.
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3
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Kobayashi T, Kurebayashi N, Murayama T. The Ryanodine Receptor as a Sensor for Intracellular Environments in Muscles. Int J Mol Sci 2021; 22:ijms221910795. [PMID: 34639137 PMCID: PMC8509754 DOI: 10.3390/ijms221910795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 10/02/2021] [Accepted: 10/04/2021] [Indexed: 01/12/2023] Open
Abstract
The ryanodine receptor (RyR) is a Ca2+ release channel in the sarcoplasmic reticulum of skeletal and cardiac muscles and plays a key role in excitation-contraction coupling. The activity of the RyR is regulated by the changes in the level of many intracellular factors, such as divalent cations (Ca2+ and Mg2+), nucleotides, associated proteins, and reactive oxygen species. Since these intracellular factors change depending on the condition of the muscle, e.g., exercise, fatigue, or disease states, the RyR channel activity will be altered accordingly. In this review, we describe how the RyR channel is regulated under various conditions and discuss the possibility that the RyR acts as a sensor for changes in the intracellular environments in muscles.
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4
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Role of protons in calcium signaling. Biochem J 2021; 478:895-910. [PMID: 33635336 DOI: 10.1042/bcj20200971] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/28/2021] [Accepted: 02/01/2021] [Indexed: 02/03/2023]
Abstract
Thirty-six years after the publication of the important article by Busa and Nuccitelli on the variability of intracellular pH (pHi) and the interdependence of pHi and intracellular Ca2+ concentration ([Ca2+]i), little research has been carried out on pHi and calcium signaling. Moreover, the results appear to be contradictory. Some authors claim that the increase in [Ca2+]i is due to a reduction in pHi, others that it is caused by an increase in pHi. The reasons for these conflicting results have not yet been discussed and clarified in an exhaustive manner. The idea that variations in pHi are insignificant, because cellular buffers quickly stabilize the pHi, may be a limiting and fundamentally wrong concept. In fact, it has been shown that protons can move and react in the cell before they are neutralized. Variations in pHi have a remarkable impact on [Ca2+]i and hence on some of the basic biochemical mechanisms of calcium signaling. This paper focuses on the possible triggering role of protons during their short cellular cycle and it suggests a new hypothesis for an IP3 proton dependent mechanism of action.
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5
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Molinari G, Molinari L, Nervo E. Environmental and Endogenous Acids Can Trigger Allergic-Type Airway Reactions. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:E4688. [PMID: 32610702 PMCID: PMC7370125 DOI: 10.3390/ijerph17134688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/20/2020] [Accepted: 06/25/2020] [Indexed: 12/13/2022]
Abstract
Inflammatory allergic and nonallergic respiratory disorders are spreading worldwide and often coexist. The root cause is not clear. This review demonstrates that, from a biochemical point of view, it is ascribable to protons (H+) released into cells by exogenous and endogenous acids. The hypothesis of acids as the common cause stems from two considerations: (a) it has long been known that exogenous acids present in air pollutants can induce the irritation of epithelial surfaces, particularly the airways, inflammation, and bronchospasm; (b) according to recent articles, endogenous acids, generated in cells by phospholipases, play a key role in the biochemical mechanisms of initiation and progression of allergic-type reactions. Therefore, the intracellular acidification and consequent Ca2+ increase, induced by protons generated by either acid pollutants or endogenous phospholipases, may constitute the basic mechanism of the multimorbidity of these disorders, and environmental acidity may contribute to their spread.
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Affiliation(s)
- Giuliano Molinari
- Studio Tecnico Ing. Laura Molinari, Environmental Health and Safety Via Quarto Ponte 17, 37138 Verona, Italy;
| | - Laura Molinari
- Studio Tecnico Ing. Laura Molinari, Environmental Health and Safety Via Quarto Ponte 17, 37138 Verona, Italy;
| | - Elsa Nervo
- Elsa Nervo, Società Chimica Italiana, 00198 Rome, Italy;
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6
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Zhang Y, Bu F, Zhao Y, Zhao B, Wang L, Song B. A hemicyanine fluorescent probe with intramolecular charge transfer (ICT) mechanism for highly sensitive and selective detection of acidic pH and its application in living cells. Anal Chim Acta 2020; 1098:155-163. [DOI: 10.1016/j.aca.2019.11.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 01/09/2023]
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7
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Bi X, Wang Y, Wang D, Liu L, Zhu W, Zhang J, Zha X. A mitochondrial-targetable dual functional near-infrared fluorescent probe to monitor pH and H2O2 in living cells and mice. RSC Adv 2020; 10:26874-26879. [PMID: 35515755 PMCID: PMC9055531 DOI: 10.1039/d0ra03905e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/29/2020] [Indexed: 12/23/2022] Open
Abstract
A lower pH level and high hydrogen peroxide (H2O2) concentration in mitochondria is closely associated with a variety of diseases including cancer and inflammation. Thus, determination of changes in the level of acidic pH and H2O2 is of great importance and could provide new insights into the key functions under both physiological and pathological conditions. Herein, we present a novel mitochondria-targetable probe NIR-pH-H2O2, as the first near infrared (NIR) fluorescent small molecule, to monitor changes of endogenous pH (pka = 6.17) and H2O2 with high sensitivity, good compatibility and low cytotoxicity. Futhermore, it was successfully employed to monitor pH and H2O2 in a mouse acute inflammation model. These results demonstrate that NIR-pH-H2O2 is a novel bifunctional mitochondrial-targeted NIR probe to sense acidic pH and H2O2in vitro and in vivo, indicating its huge potential for the diagnosis of pH and H2O2-related diseases. A lower pH level and high hydrogen peroxide (H2O2) concentration in mitochondria is closely associated with a variety of diseases including cancer and inflammation.![]()
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Affiliation(s)
- Xueyuan Bi
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Yingying Wang
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Dandan Wang
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Liming Liu
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Wen Zhu
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Junjie Zhang
- School of Pharmacy
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Xiaoming Zha
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
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8
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Jiang T, Wang X, Wang G, Wang Y, Wang K, Xuan X, Chen C, Jiang K, Zhang H. Light-activated "cycle-reversible intramolecular charge transfer" fluorescent probe: monitoring of pHi trace change induced by UV light in programmed cell death. Chem Commun (Camb) 2019; 55:5279-5282. [PMID: 30993268 DOI: 10.1039/c9cc01451a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Under the synergistic effects of protonation and deprotonation, a light-activated fluorescent probe (UV-SP) exhibited "cycle-reversible intramolecular charge transfer (ICT)" for different pH after activation by UV light, resulting in emission of multiple ratio fluorescent signals (FI563/FI595 and FI664/FI595). Based on these kinds of response signals, UV-SP can specifically monitor the cycle-reversible trace change of intracellular pH caused by UV radiation. More importantly, according to the stable and invariant multiple ratio fluorescent signals, UV-SP can sort cells entering programmed death.
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Affiliation(s)
- Tao Jiang
- Henan Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Key Laboratory of Green Chemical Media and Reactions, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering Institution, Henan Normal University, Xinxiang 453007, China.
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9
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Chao JB, Li M, Zhang YB, Yin CX, Huo FJ. A simple fluorescent pH probe and its application in cells. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00699-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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10
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Chao J, Song K, Zhang Y, Yin C, Huo F, Wang J, Zhang T. A pyrene-based colorimetric and fluorescent pH probe with large stokes shift and its application in bioimaging. Talanta 2018; 189:150-156. [DOI: 10.1016/j.talanta.2018.06.073] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 06/18/2018] [Accepted: 06/24/2018] [Indexed: 01/09/2023]
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11
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Chen H, Wang J, Shan D, Chen J, Zhang S, Lu X. Dual-Emitting Fluorescent Metal-Organic Framework Nanocomposites as a Broad-Range pH Sensor for Fluorescence Imaging. Anal Chem 2018; 90:7056-7063. [PMID: 29724095 DOI: 10.1021/acs.analchem.8b01455] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
pH plays an important role in understanding physiological/pathologic processes, and abnormal pH is a symbol of many common diseases such as cancer, stroke, and Alzheimer's disease. In this work, an effective dual-emission fluorescent metal-organic framework nanocomposite probe (denoted as RB-PCN) has been constructed for sensitive and broad-range detection of pH. RB-PCN was prepared by encapsulating the DBI-PEG-NH2-functionalized Fe3O4 into Zr-MOFs and then further reacting it with rhodamine B isothiocyanates (RBITC). In RB-PCN, RBITC is capable of sensing changes in pH in acidic solutions. Zr-MOFs not only enrich the target analyte but also exhibit a fluorescence response to pH changes in alkaline solutions. Based on the above structural and compositional features, RB-PCN could detect a wide range of pH changes. Importantly, such a nanoprobe could "see" the intracellular pH changes by fluorescence confocal imaging as well as "measure" the wider range of pH in actual samples by fluorescence spectroscopy. To the best of our knowledge, this is the first time a MOF-based dual-emitting fluorescent nanoprobe has been used for a wide range of pH detection.
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Affiliation(s)
- Haiyong Chen
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China
| | - Jing Wang
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China
| | - Duoliang Shan
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China
| | - Jing Chen
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China
| | - Shouting Zhang
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China.,Tianjin Key Laboratory of Molecular Optoelectronics, Department of Chemistry , Tianjin University , Tianjin 300072 , P. R. China
| | - Xiaoquan Lu
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering , Northwest Normal University , Lanzhou 730070 , P. R. China.,Tianjin Key Laboratory of Molecular Optoelectronics, Department of Chemistry , Tianjin University , Tianjin 300072 , P. R. China
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12
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Espinoza-Fonseca LM. The Ca 2+-ATPase pump facilitates bidirectional proton transport across the sarco/endoplasmic reticulum. MOLECULAR BIOSYSTEMS 2017; 13:633-637. [PMID: 28290590 DOI: 10.1039/c7mb00065k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Ca2+ transport across the sarco/endoplasmic reticulum (SR) plays an essential role in intracellular Ca2+ homeostasis, signalling, cell differentiation and muscle contractility. During SR Ca2+ uptake and release, proton fluxes are required to balance the charge deficit generated by the exchange of Ca2+ and other ions across the SR. During Ca2+ uptake by the SR Ca2+-ATPase (SERCA), two protons are countertransported from the SR lumen to the cytosol, thus partially compensating for the charge moved by Ca2+ transport. Studies have shown that protons are also transported from the cytosol to the lumen during Ca2+ release, but a transporter that facilitates proton transport into the SR lumen has not been described. In this article we propose that SERCA forms pores that facilitate bidirectional proton transport across the SR. We describe the location and structure of water-filled pores in SERCA that form cytosolic and luminal pathways for protons to cross the SR membrane. Based on this structural information, we suggest mechanistic models for proton translocation to the cytosol during active Ca2+ transport, and into the SR lumen during SERCA inhibition by endogenous regulatory proteins. Finally, we discuss the physiological consequences of SERCA-mediated bidirectional proton transport across the SR membrane of muscle and non-muscle cells.
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Affiliation(s)
- L Michel Espinoza-Fonseca
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
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13
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Chao J, Song K, Wang H, Li Z, Zhang Y, Yin C, Huo F, Wang J, Zhang T. A colorimetric and fluorescent pH probe for imaging in E. coli cells. RSC Adv 2017. [DOI: 10.1039/c6ra24885c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
MDAKexhibited turn-off fluorescence as the pH decreased. Simultaneously, the color of the solution changed from yellow to colorless.
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Affiliation(s)
- Jianbin Chao
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
| | - Kailun Song
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
- School of Chemistry and Chemical Engineering
| | - Huijuan Wang
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
- School of Chemistry and Chemical Engineering
| | - Zhiqing Li
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
- School of Chemistry and Chemical Engineering
| | - Yongbin Zhang
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan 030006
- China
| | - Caixia Yin
- Institute of Molecular Science
- Shanxi University
- Taiyuan 030006
- China
| | - Fangjun Huo
- Research Institute of Applied Chemistry
- Shanxi University
- Taiyuan 030006
- China
| | - Juanjuan Wang
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
| | - Ting Zhang
- Scientific Instrument Center
- Shanxi University
- Taiyuan 030006
- China
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14
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Fu J, Ding C, Zhu A, Tian Y. An efficient core-shell fluorescent silica nanoprobe for ratiometric fluorescence detection of pH in living cells. Analyst 2016; 141:4766-71. [PMID: 27291898 DOI: 10.1039/c6an00981f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Intracellular pH plays a vital role in cell biology, including signal transduction, ion transport and homeostasis. Herein, a ratiometric fluorescent silica probe was developed to detect intracellular pH values. The pH sensitive dye fluorescein isothiocyanate isomer I (FITC), emitting green fluorescence, was hybridized with reference dye rhodamine B (RB), emitting red fluorescence, as a dual-emission fluorophore, in which RB was embedded in a silica core of ∼40 nm diameter. Moreover, to prevent fluorescence resonance energy transfer between FITC and RB, FITC was grafted onto the surface of core-shell silica colloidal particles with a shell thickness of 10-12 nm. The nanoprobe exhibited dual emission bands centered at 517 and 570 nm, under single wavelength excitation of 488 nm. RB encapsulated in silica was inert to pH change and only served as reference signals for providing built-in correction to avoid environmental effects. Moreover, FITC (λem = 517 nm) showed high selectivity toward H(+) against metal ions and amino acids, leading to fluorescence variation upon pH change. Consequently, variations of the two fluorescence intensities (Fgreen/Fred) resulted in a ratiometric pH fluorescent sensor. The specific nanoprobe showed good linearity with pH variation in the range of 6.0-7.8. It can be noted that the fluorescent silica probe demonstrated good water dispersibility, high stability and low cytotoxicity. Accordingly, imaging and biosensing of pH variation was successfully achieved in HeLa cells.
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Affiliation(s)
- Jingni Fu
- Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, China
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15
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Song X, Hu M, Wang C, Xiao Y. Near-infrared fluorescent probes with higher quantum yields and neutral pKa values for the evaluation of intracellular pH. RSC Adv 2016. [DOI: 10.1039/c6ra11637j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Near-infrared fluorescent probes for pH, named pH-A and pH-B, for labeling cells to produce high resolution fluorescent images reflect the changes of intracellular pH.
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Affiliation(s)
- Xinbo Song
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Mingyu Hu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Chao Wang
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
| | - Yi Xiao
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- China
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16
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Ma Y, Li J, Hou S, Zhang J, Shi Z, Jiang T, Wei X. pH-Sensitive perylene tetra-(alkoxycarbonyl) probes for live cell imaging. NEW J CHEM 2016. [DOI: 10.1039/c6nj00153j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel perylene pH probe for imaging of living cells in neutral to weak basic pH changes.
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Affiliation(s)
- Yongshan Ma
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Shandong Normal University
- Jinan 250014
| | - Jiaofu Li
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Shandong Normal University
- Jinan 250014
| | - Shuguo Hou
- School of Municipal and Environmental Engineering
- Shandong Jianzhu University
- Jinan 250101
- P. R. China
- Co-Innovation Center of Green Building
| | - Jinfeng Zhang
- School of Municipal and Environmental Engineering
- Shandong Jianzhu University
- Jinan 250101
- P. R. China
| | - Zhiqiang Shi
- College of Chemistry
- Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Shandong Normal University
- Jinan 250014
| | - Tianyi Jiang
- School of Municipal and Environmental Engineering
- Shandong Jianzhu University
- Jinan 250101
- P. R. China
- Co-Innovation Center of Green Building
| | - Xiaofeng Wei
- School of Municipal and Environmental Engineering
- Shandong Jianzhu University
- Jinan 250101
- P. R. China
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17
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He L, Lin W, Xu Q, Ren M, Wei H, Wang JY. A simple and effective "capping" approach to readily tune the fluorescence of near-infrared cyanines. Chem Sci 2015; 6:4530-4536. [PMID: 28717473 PMCID: PMC5499489 DOI: 10.1039/c5sc00348b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 05/01/2015] [Indexed: 01/23/2023] Open
Abstract
A simple and effective capping approach was introduced to readily tune the fluorescence of NIR cyanines.
Heptamethine cyanines are favorable for fluorescence imaging applications in biological systems owing to their near-infrared (NIR) absorption and emission. However, it is very difficult to quench the fluorescence of NIR dyes by the classic photoinduced electron transfer mechanism due to their relatively high-lying occupied molecular orbital energy levels. Herein, we present a simple and effective “capping” approach to readily tune the fluorescence of NIR cyanines. The resulting new functional NIR CyBX (X = O, N, or S) dyes not only retain the intact tricarbocyanine scaffold, but also have a built-in switch to regulate the fluorescence by spiro-cyclization. When compared to traditional cyanines, novel CyBX dyes have a superior character in that their NIR optical properties can be readily tuned by the intrinsic spiro-cyclization mechanism. We expect that this “capping” strategy can be extended across not only the visual spectrum but also to structurally distinct fluorophores.
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Affiliation(s)
- Longwei He
- State Key Laboratory of Chemo/Biosensing and Chemometrics , College of Chemistry and Chemical Engineering , Hunan University , Changsha , Hunan 410082 , P.R. China
| | - Weiying Lin
- Institute of Fluorescent Probes for Biological Imaging , School of Chemistry and Chemical Engineering , School of Biological Science and Technology , University of Jinan , Jinan , Shandong 250022 , P.R. China . .,State Key Laboratory of Chemo/Biosensing and Chemometrics , College of Chemistry and Chemical Engineering , Hunan University , Changsha , Hunan 410082 , P.R. China
| | - Qiuyan Xu
- State Key Laboratory of Chemo/Biosensing and Chemometrics , College of Chemistry and Chemical Engineering , Hunan University , Changsha , Hunan 410082 , P.R. China
| | - Mingguang Ren
- Institute of Fluorescent Probes for Biological Imaging , School of Chemistry and Chemical Engineering , School of Biological Science and Technology , University of Jinan , Jinan , Shandong 250022 , P.R. China .
| | - Haipeng Wei
- State Key Laboratory of Chemo/Biosensing and Chemometrics , College of Chemistry and Chemical Engineering , Hunan University , Changsha , Hunan 410082 , P.R. China
| | - Jian-Yong Wang
- Institute of Fluorescent Probes for Biological Imaging , School of Chemistry and Chemical Engineering , School of Biological Science and Technology , University of Jinan , Jinan , Shandong 250022 , P.R. China .
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18
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Han Y, Ding C, Zhou J, Tian Y. Single Probe for Imaging and Biosensing of pH, Cu(2+) Ions, and pH/Cu(2+) in Live Cells with Ratiometric Fluorescence Signals. Anal Chem 2015; 87:5333-9. [PMID: 25898074 DOI: 10.1021/acs.analchem.5b00628] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
It is very essential to disentangle the complicated inter-relationship between pH and Cu in the signal transduction and homeostasis. To this end, reporters that can display distinct signals to pH and Cu are highly valuable. Unfortunately, there is still no report on the development of biosensors that can simultaneously respond to pH and Cu(2+), to the best of our knowledge. In this work, we developed a single fluorescent probe, AuNC@FITC@DEAC (AuNC, gold cluster; FITC, fluorescein isothiocyanate; DEAC, 7-diethylaminocoumarin-3-carboxylic acid), for biosensing of pH, Cu(2+), and pH/Cu(2+) with different ratiometric fluorescent signals. First, 2,2',2″-(2,2',2″-nitrilotris(ethane-2,1-diyl)tris((pyridin-2-yl-methyl)azanediyl))triethanethiol (TPAASH) was designed for specific recognition of Cu(2+), as well as for organic ligand to synthesize fluorescent AuNCs. Then, pH-sensitive molecule, FITC emitting at 518 nm, and inner reference molecule, DEAC with emission peak at 472 nm, were simultaneously conjugated on the surface of AuNCs emitting at 722 nm, thus, constructing a single fluorescent probe, AuNC@FITC@DEAC, to sensing pH, Cu(2+), and pH/Cu(2+) excited by 405 nm light. The developed probe exhibited high selectivity and accuracy for independent determination of pH and Cu(2+) against reactive oxygen species (ROS), other metal ions, amino acids, and even copper-containing proteins. The AuNC-based inorganic-organic probe with good cell-permeability and high biocompatibility was eventually applied in monitoring both pH and Cu(2+) and in understanding the interplaying roles of Cu(2+) and pH in live cells by ratiometric multicolor fluorescent imaging.
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Affiliation(s)
- Yingying Han
- †Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Changqin Ding
- †Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Jie Zhou
- †Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China
| | - Yang Tian
- †Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, People's Republic of China.,‡Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, North Zhongshan Road 3663, Shanghai 200062, People's Republic of China
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19
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Li Y, Wang Y, Yang S, Zhao Y, Yuan L, Zheng J, Yang R. Hemicyanine-based High Resolution Ratiometric near-Infrared Fluorescent Probe for Monitoring pH Changes in Vivo. Anal Chem 2015; 87:2495-503. [DOI: 10.1021/ac5045498] [Citation(s) in RCA: 186] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yinhui Li
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yijun Wang
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Sheng Yang
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yirong Zhao
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Lin Yuan
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Jing Zheng
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Ronghua Yang
- State Key Laboratory
of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
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20
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You QH, Lee YM, Chan WH, Mak NK, Lee AWM, Hau SCK, Mak TCW. A colorimetric and ratiometric fluorescent pH probe based on ring opening/closing approach and its applications in monitoring cellular pH change. RSC Adv 2015. [DOI: 10.1039/c4ra13445a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A cell permeable colorimetric and ratiometric fluorescent pH probe with a pKavalue of 6.0 has been developed.
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Affiliation(s)
- Qi-Hua You
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- China
- Partner State Key Laboratory of Environmental and Bioanalysis
| | - Yee Man Lee
- Department of Biology
- Hong Kong Baptist University
- Kowloon Tong
- China
| | - Wing Hong Chan
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- China
- Partner State Key Laboratory of Environmental and Bioanalysis
| | - Nai Ki Mak
- Department of Biology
- Hong Kong Baptist University
- Kowloon Tong
- China
| | - Albert W. M. Lee
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- China
| | - Sam C. K. Hau
- Department of Chemistry
- Hong Kong Baptist University
- Kowloon Tong
- China
- Department of Chemistry
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21
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Nan M, Niu W, Fan L, Lu W, Shuang S, Li C, Dong C. Indole-based pH probe with ratiometric fluorescence behavior for intracellular imaging. RSC Adv 2015. [DOI: 10.1039/c5ra19180g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
3-[3-(4-Fluorophenyl)-1-(1-methylethyl)-1H-indol-2-yl]-(E)-2-propenal(FMIP) was used as a ratiometric fluorescent pH probe with favorable optical properties. The probe has excellent cell membrane permeability and is applied successfully to monitor pH in living cells.
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Affiliation(s)
- Ming Nan
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Weifen Niu
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Li Fan
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Wenjing Lu
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Shaomin Shuang
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
| | - Chenzhong Li
- Nanobiosensors/Bioelectronics Laboratory
- Department of Biomedical Engineering
- Florida International University
- Miami
- USA
| | - Chuan Dong
- Institute of Environmental Science
- School of Chemistry and Chemical Engineering
- Shanxi University
- Taiyuan 030006
- People's Republic of China
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22
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Wu YX, Zhang XB, Li JB, Zhang CC, Liang H, Mao GJ, Zhou LY, Tan W, Yu RQ. Bispyrene–Fluorescein Hybrid Based FRET Cassette: A Convenient Platform toward Ratiometric Time-Resolved Probe for Bioanalytical Applications. Anal Chem 2014; 86:10389-96. [DOI: 10.1021/ac502863m] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yong-Xiang Wu
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Xiao-Bing Zhang
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Jun-Bin Li
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Cui-Cui Zhang
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Hao Liang
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Guo-Jiang Mao
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Li-Yi Zhou
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Weihong Tan
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
| | - Ru-Qin Yu
- Molecular Science and Biomedicine Laboratory, State Key
Laboratory of Chemo/Biosensing and Chemometrics, College
of Chemistry and Chemical Engineering, College of Biology, Hunan University, Changsha 410082, China
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23
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Lin J, Zheng Y, Wang Q, Zeng Z, Zhang CC. Novel lanthanide pH fluorescent probes based on multiple emissions and its visible-light-sensitized feature. Anal Chim Acta 2014; 839:51-8. [DOI: 10.1016/j.aca.2014.06.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 06/10/2014] [Accepted: 06/11/2014] [Indexed: 12/22/2022]
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24
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Huang W, Lin W, Guan X. Development of ratiometric fluorescent pH sensors based on chromenoquinoline derivatives with tunable pKa values for bioimaging. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.10.130] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Fénelon K, Lamboley CRH, Carrier N, Pape PC. Calcium buffering properties of sarcoplasmic reticulum and calcium-induced Ca(2+) release during the quasi-steady level of release in twitch fibers from frog skeletal muscle. ACTA ACUST UNITED AC 2013; 140:403-19. [PMID: 23008434 PMCID: PMC3457687 DOI: 10.1085/jgp.201110730] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Experiments were performed to characterize the properties of the intrinsic Ca2+ buffers in the sarcoplasmic reticulum (SR) of cut fibers from frog twitch muscle. The concentrations of total and free calcium ions within the SR ([CaT]SR and [Ca2+]SR) were measured, respectively, with the EGTA/phenol red method and tetramethylmurexide (a low affinity Ca2+ indicator). Results indicate SR Ca2+ buffering was consistent with a single cooperative-binding component or a combination of a cooperative-binding component and a linear binding component accounting for 20% or less of the bound Ca2+. Under the assumption of a single cooperative-binding component, the most likely resting values of [Ca2+]SR and [CaT]SR are 0.67 and 17.1 mM, respectively, and the dissociation constant, Hill coefficient, and concentration of the Ca-binding sites are 0.78 mM, 3.0, and 44 mM, respectively. This information can be used to calculate a variable proportional to the Ca2+ permeability of the SR, namely d[CaT]SR/dt ÷ [Ca2+]SR (denoted release permeability), in experiments in which only [CaT]SR or [Ca2+]SR is measured. In response to a voltage-clamp step to −20 mV at 15°C, the release permeability reaches an early peak followed by a rapid decline to a quasi-steady level that lasts ∼50 ms, followed by a slower decline during which the release permeability decreases by at least threefold. During the quasi-steady level of release, the release amplitude is 3.3-fold greater than expected from voltage activation alone, a result consistent with the recruitment by Ca-induced Ca2+ release of 2.3 SR Ca2+ release channels neighboring each channel activated by its associated voltage sensor. Release permeability at −60 mV increases as [CaT]SR decreases from its resting physiological level to ∼0.1 of this level. This result argues against a release termination mechanism proposed in mammalian muscle fibers in which a luminal sensor of [Ca2+]SR inhibits release when [CaT]SR declines to a low level.
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Affiliation(s)
- Karine Fénelon
- Département de physiologie et biophysique, Université de Sherbrooke Faculté de Médecine et des Sciences de la Santé, Sherbrooke, Québec J1H5N4, Canada
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26
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Long L, Li X, Zhang D, Meng S, Zhang J, Sun X, Zhang C, Zhou L, Wang L. Amino-coumarin based fluorescence ratiometric sensors for acidic pH and their application for living cells imaging. RSC Adv 2013. [DOI: 10.1039/c3ra41329b] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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27
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Men G, Zhang G, Liang C, Liu H, Yang B, Pan Y, Wang Z, Jiang S. A dual channel optical detector for trace water chemodosimetry and imaging of live cells. Analyst 2013; 138:2847-57. [DOI: 10.1039/c3an36887d] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Development of a ratiometric time-resolved luminescence sensor for pH based on lanthanide complexes. Anal Chim Acta 2013; 761:149-56. [DOI: 10.1016/j.aca.2012.11.025] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 10/19/2012] [Accepted: 11/16/2012] [Indexed: 01/22/2023]
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29
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Chung CYS, Li SPY, Louie MW, Lo KKW, Yam VWW. Induced self-assembly and disassembly of water-soluble alkynylplatinum(ii) terpyridyl complexes with “switchable” near-infrared (NIR) emission modulated by metal–metal interactions over physiological pH: demonstration of pH-responsive NIR luminescent probes in cell-imaging studies. Chem Sci 2013. [DOI: 10.1039/c3sc50196e] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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30
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Kong B, Zhu A, Ding C, Zhao X, Li B, Tian Y. Carbon dot-based inorganic-organic nanosystem for two-photon imaging and biosensing of pH variation in living cells and tissues. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:5844-8. [PMID: 22933395 DOI: 10.1002/adma.201202599] [Citation(s) in RCA: 356] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 07/10/2012] [Indexed: 05/23/2023]
Abstract
A carbon dot (C-Dot)-based two-photon fluorescent probe has been developed for the monitoring of pH changes across a broad range with high sensitivity and selectivity. The inorganic-organic probe also shows good biocompatibility and cell permeability, and thus can be successfully applied in bioimaging and biosensing of physiological pH in living cells, as well as living tissues at a depth of 65-185 μm.
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Affiliation(s)
- Biao Kong
- Department of Chemistry, Tongji University, Siping Road 1239, Shanghai 200092, P. R. China
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31
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Huang R, Yan S, Zheng X, Luo F, Deng M, Fu B, Xiao Y, Zhao X, Zhou X. Development of a pH-activatable fluorescent probe and its application for visualizing cellular pH change. Analyst 2012; 137:4418-20. [DOI: 10.1039/c2an35671f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Burguete MI, Galindo F, Izquierdo MA, O'Connor JE, Herrera G, Luis SV, Vigara L. Synthesis and Evaluation of Pseudopeptidic Fluorescence pH Probes for Acidic Cellular Organelles: In Vivo Monitoring of Bacterial Phagocytosis by Multiparametric Flow Cytometry. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000854] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Affiliation(s)
- Junyan Han
- Department of Chemistry, Texas A&M University, Box 30012, College Station, Texas 77841, USA
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34
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Tang B, Yu F, Li P, Tong L, Duan X, Xie T, Wang X. A near-infrared neutral pH fluorescent probe for monitoring minor pH changes: imaging in living HepG2 and HL-7702 cells. J Am Chem Soc 2010; 131:3016-23. [PMID: 19199620 DOI: 10.1021/ja809149g] [Citation(s) in RCA: 349] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A near-neutral pH near-infrared (NIR) fluorescent probe utilizing a fluorophore-spacer- receptor molecular framework that can modulate the fluorescence emission intensity through a fast photoinduced electron-transfer process was developed. Our strategy was to choose tricarbocyanine (Cy), a NIR fluorescent dye with high extinction coefficients, as a fluorophore, and 4'-(aminomethylphenyl)-2,2':6',2''-terpyridine (Tpy) as a receptor. The pH titration indicated that Tpy-Cy can monitor the minor physiological pH fluctuations with a pK(a) of approximately 7.10 near physiological pH, which is valuable for intracellular pH researches. The probe responds linearly and rapidly to minor pH fluctuations within the range of 6.70-7.90 and exhibits strong dependence on pH changes. As expected, the real-time imaging of cellular pH and the detection of pH in situ was achieved successfully in living HepG2 and HL-7702 cells by this probe. It is shown that the probe effectively avoids the influence of autofluorescence and native cellular species in biological systems and meanwhile exhibits high sensitivity, good photostability, and excellent cell membrane permeability.
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Affiliation(s)
- Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Engineering Research Center of Pesticide and Medicine Intermediate Clean Production, Ministry of Education, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, People's Republic of China.
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35
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Scheibe RJ, Mundhenk K, Becker T, Hallerdei J, Waheed A, Shah GN, Sly WS, Gros G, Wetzel P. Carbonic anhydrases IV and IX: subcellular localization and functional role in mouse skeletal muscle. Am J Physiol Cell Physiol 2008; 294:C402-12. [DOI: 10.1152/ajpcell.00228.2007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The subcellular localization of carbonic anhydrase (CA) IV and CA IX in mouse skeletal muscle fibers has been studied immunohistochemically by confocal laser scanning microscopy. CA IV has been found to be located on the plasma membrane as well as on the sarcoplasmic reticulum (SR) membrane. CA IX is not localized in the plasma membrane but in the region of the t-tubular (TT)/terminal SR membrane. CA IV contributes 20% and CA IX 60% to the total CA activity of SR membrane vesicles isolated from mouse skeletal muscles. Our aim was to examine whether SR CA IV and TT/SR CA IX affect muscle contraction. Isolated fiber bundles of fast-twitch extensor digitorum longus and slow-twitch soleus muscle from mouse were investigated for isometric twitch and tetanic contractions and by a fatigue test. The muscle functions of CA IV knockout (KO) fibers and of CA IX KO fibers do not differ from the function of wild-type (WT) fibers. Muscle function of CA IV/XIV double KO mice unexpectedly shows a decrease in rise and relaxation time and in force of single twitches. In contrast, the CA inhibitor dorzolamide, whether applied to WT or to double KO muscle fibers, leads to a significant increase in rise time and force of twitches. It is concluded that the function of mouse skeletal muscle fibers expressing three membrane-associated CAs, IV, IX, and XIV, is not affected by the lack of one isoform but is possibly affected by the lack of all three CAs, as indicated by the inhibition studies.
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36
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Wetzel P, Scheibe RJ, Hellmann B, Hallerdei J, Shah GN, Waheed A, Gros G, Sly WS. Carbonic anhydrase XIV in skeletal muscle: subcellular localization and function from wild-type and knockout mice. Am J Physiol Cell Physiol 2007; 293:C358-66. [PMID: 17459948 DOI: 10.1152/ajpcell.00057.2007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The expression of carbonic anhydrase (CA) XIV was investigated in mouse skeletal muscles. Sarcoplasmic reticulum (SR) and sarcolemmal (SL) membrane fractions were isolated from wild-type (WT) and CA XIV knockout (KO) mice. The CA XIV protein of 54 kDa was present in SR and SL membrane fractions as shown by Western blot analysis. CA activity measurements of WT and KO membrane fractions showed that CA XIV accounts for approximately 50% and 66% of the total CA activities determined in the SR and SL fractions, respectively. This indicates the presence of at least one other membrane-associated CA isoform in these membranes, e.g., CA IV, CA IX, or CA XII. Muscle fibers of the extensor digitorum longus (EDL) muscle were immunostained with anti-CA XIV/FITC and anti-sarco(endo)plasmic reticulum Ca(2+)-ATPase 1/TRITC, with anti-CA XIV/FITC and anti-ryanodine receptor/TRITC, or with anti-CA XIV/FITC and anti-monocarboxylate transporter-4/TRITC. CA XIV was expressed in the plasma membrane and in the longitudinal SR but not in the terminal SR. Isometric contraction measurements of single twitches and tetani and a fatigue protocol applied to fiber bundles of the fast-twitch EDL and of the slow-twitch soleus muscle from WT and KO mice showed that the lack of SR membrane-associated CA XIV did not affect maximum force, rise and relaxation times, and fatigue behavior. Thus, it is concluded that a reduction of the total SR CA activity by approximately 50% in CA XIV KO mice does not lead to an impairment of SR function.
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Affiliation(s)
- Petra Wetzel
- Zentrum Physiologie, Medizinische Hochschule Hannover, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany.
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37
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Pape PC, Fénelon K, Lamboley CRH, Stachura D. Role of calsequestrin evaluated from changes in free and total calcium concentrations in the sarcoplasmic reticulum of frog cut skeletal muscle fibres. J Physiol 2007; 581:319-67. [PMID: 17331996 PMCID: PMC2075213 DOI: 10.1113/jphysiol.2006.126474] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Calsequestrin is a large-capacity Ca-binding protein located in the terminal cisternae of sarcoplasmic reticulum (SR) suggesting a role as a buffer of the concentration of free Ca in the SR ([Ca2+](SR)) serving to maintain the driving force for SR Ca2+ release. Essentially all of the functional studies on calsequestrin to date have been carried out on purified calsequestrin or on disrupted muscle preparations such as terminal cisternae vesicles. To obtain information about calsequestrin's properties during physiological SR Ca2+ release, experiments were carried out on frog cut skeletal muscle fibres using two optical methods. One - the EGTA-phenol red method - monitored the content of total Ca in the SR ([Ca(T)](SR)) and the other used the low affinity Ca indicator tetramethylmurexide (TMX) to monitor the concentration of free Ca in the SR. Both methods relied on a large concentration of the Ca buffer EGTA (20 mM), in the latter case to greatly reduce the increase in myoplasmic [Ca2+] caused by SR Ca2+ release thereby almost eliminating the myoplasmic component of the TMX signal. By releasing almost all of the SR Ca, these optical signals provided information about [Ca(T)](SR) versus [Ca2+](SR) as [Ca2+](SR) varied from its resting level ([Ca2+](SR,R)) to near zero. Since almost all of the Ca in the SR is bound to calsequestrin, this information closely resembles the binding curve of the Ca-calsequestrin reaction. Calcium binding to calsequestrin was found to be cooperative (estimated Hill coefficient = 2.95) and to have a very high capacity (at the start of Ca2+ release, 23 times more Ca was estimated to initiate from calsequestrin as opposed to the pool of free Ca in the SR). The latter result contrasts with an earlier report that only approximately 25% of released Ca2+ comes from calsequestrin and approximately 75% comes from the free pool. The value of [Ca2+](SR,R) was close to the K(D) for calsequestrin, which has a value near 1 mm in in vitro studies. Other evidence indicates that [Ca2+](SR,R) is near 1 mM in cut fibres. These results along with the known rapid kinetics of the Ca-calsequestrin binding reaction indicate that calsequestrin's properties are optimized to buffer [Ca2+](SR) during rapid, physiological SR Ca2+ release. Although the results do not entirely rule out a more active role in the excitation-contraction coupling process, they do indicate that passive buffering of [Ca2+](SR) is a very important function of calsequestrin.
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Affiliation(s)
- Paul C Pape
- Département de physiologie et biophysique, Université de Sherbrooke Faculté de médicine, 3001, 12e Avenue Nord, Sherbrooke, Québec, Canada J1H5 N4.
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38
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Seehase M, Quentin T, Wiludda E, Hellige G, Paul T, Schiffmann H. Gene Expression of the Na +–Ca 2+ Exchanger, SERCA2a and Calsequestrin after Myocardial Ischemia in the Neonatal Rabbit Heart. Neonatology 2006; 90:174-84. [PMID: 16645265 DOI: 10.1159/000092888] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Accepted: 10/04/2005] [Indexed: 11/19/2022]
Abstract
BACKGROUND Neonatal hearts are less susceptible to developing myocardial dysfunction after hypoxia and/or ischemia than adult hearts. Differences in intracellular calcium homeostasis may be responsible for reduced calcium overload of the immature myocardium leading to the observed protection against ischemia. OBJECTIVE To assess differences in baseline and post-ischemic gene expression of calcium handling proteins after ischemia in neonatal and adult rabbit hearts. METHODS We used isolated antegrade perfused rabbit hearts (age 2 days, 28 days, n = 32), which were exposed to ischemia and hypothermia simulating myocardial stunning comparable to neonatal asphyxia. Gene and protein expression of the sodium-calcium exchanger (NCX), the sarco-endoplasmatic reticulum Ca2+-ATPase 2a (SERCA) and calsequestrin (CSQ) were measured using quantitative real-time PCR and Western blotting. RESULTS After ischemia and reperfusion in neonatal and adult hearts, a significant decrease in myocardial performance was recorded. At the mRNA level, significant differences in the baseline expression of NCX, SERCA and CSQ between neonatal and adult hearts were observed. In neonatal post-ischemic hearts, NCX and CSQ expression were significantly higher at the mRNA level than in controls. In contrast, SERCA expression remained unchanged in neonatal hearts and decreased in adult hearts compared to the non-ischemic controls. CONCLUSION These findings suggest that changes in gene expression of calcium handling proteins may be involved in the different susceptibility of neonatal compared to adult hearts to developing myocardial dysfunction after ischemia.
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Affiliation(s)
- Matthias Seehase
- Department of Pediatric Cardiology and Pediatric Intensive Care, Georg-August-Universitat, Gottingen, Germany
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39
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Abstract
Fast (10-30 microm/s) calcium waves can be propagated through all nucleated eukaryotic cells that have been tested as well as certain cell-free extracts. In a widely used model, they are propagated by a reaction-diffusion cycle in which calcium ions diffuse along the outside of endoplasmic reticula and induce their own release from calsequestrin or calreticulin molecules stored within the reticulum's lumen. Here we propose a new tandem wave model in which they are also propagated by a reaction-diffusion cycle within a reticulum's lumen. In this cycle, increases in luminal [H(+)] induce proton release from luminal calsequestrin or calreticulin. The released protons diffuse ahead to where they release more protons from these luminal storage proteins. What might be called proton induced proton release. They also raise luminal electropositivity. The resultant luminal waves are coordinated with extrareticular ones by movements of calcium and hydrogen ions through the reticular membrane. This model makes five testable predictions which include the autorelease of protons in solutions of calsequestrins or calreticulins as well as waves of increased [H(+)], of increased [Ca(2+)] and of more positive voltage within the reticula of whole cells. Moreover, under some conditions, such luminal waves should cross regions without cytosolic ones.
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Affiliation(s)
- Lionel F Jaffe
- Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA.
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40
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Park H, Wu S, Dunker AK, Kang C. Polymerization of calsequestrin. Implications for Ca2+ regulation. J Biol Chem 2003; 278:16176-82. [PMID: 12594204 DOI: 10.1074/jbc.m300120200] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Two distinct dimerization contacts in calsequestrin crystals suggested a mechanism for Ca(2+) regulation resulting from the occurrence of coupled Ca(2+) binding and protein polymerization. Ca(2+)-induced formation of one contact was proposed to lead to dimerization followed by Ca(2+)-induced formation of the second contact to bring about polymerization (). To test this mechanism, we compared canine cardiac calsequestrin and four truncation mutants with regard to their folding properties, structures, and Ca(2+)-induced polymerization. The wild-type calsequestrin and truncation mutants exhibited similar K(+)-induced folding and end-point structures as indicated by intrinsic fluorescence and circular dichroism, respectively, whereas the polymerization tendencies of the wild-type calsequestrin differed markedly from the polymerization tendencies of the truncation mutants. Static laser light scattering and 3,3'-dithiobis sulfosuccinimidyl-propionate cross-linking indicated that wild-type protein exhibited an initial Ca(2+)-induced dimerization, followed by additional oligomerization as the Ca(2+) concentration was raised or as the K(+) concentration was lowered. None of the truncation mutants exhibited clear stepwise oligomerization that depended on increasing Ca(2+) concentration. Comparison of the three-dimensional structure of rabbit skeletal calsequestrin with a homology model of canine cardiac calsequestrin from the point of view of our coupled Ca(2+) binding and polymerization mechanism leads to a possible explanation for the 2-fold reduced Ca(2+) binding capacity of cardiac calsequestrin despite very similar overall net negative charge for the two proteins.
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Affiliation(s)
- HaJeung Park
- School of Molecular Biosciences, Department of Chemistry, Washington State University, Pullman, WA 99164, USA
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41
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Dowling P, Lohan J, Ohlendieck K. Comparative analysis of Dp427-deficient mdx tissues shows that the milder dystrophic phenotype of extraocular and toe muscle fibres is associated with a persistent expression of beta-dystroglycan. Eur J Cell Biol 2003; 82:222-30. [PMID: 12800977 DOI: 10.1078/0171-9335-00315] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The cell biological hypothesis of Duchenne muscular dystrophy assumes that deficiency in the membrane cytoskeletal element dystrophin triggers a loss in surface glycoproteins, such as beta-dystroglycan, thereby rendering the sarcolemmal membrane more susceptible to micro-rupturing. Secondary changes in ion homeostasis, such as increased cytosolic Ca2+ levels and impaired luminal Ca2+ buffering, eventually lead to Ca2+-induced myonecrosis. However, individual muscle groups exhibit a graded pathological response during the natural time course of x-linked muscular dystrophy. The absence of the dystrophin isofom Dp427 does not necessarily result in a severe dystrophic phenotype in all muscle groups. In the dystrophic mdx animal model, extraocular and toe muscles are not as severely affected as limb muscles. Here, we show that the relative expression and sarcolemmal localization of the central trans-sarcolemmal linker of the dystrophin-glycoprotein complex, beta-dystroglycan, is preserved in mdx extraocular and toe fibres by means of two-dimensional immunoblotting and immunofluorescence microscopy. Thus, with respect to improving myology diagnostics, the relative expression levels of beta-dystroglycan appear to represent reliable markers for the severity of secondary changes in dystrophin-deficient fibres. Immunoblotting and enzyme assays revealed that mdx toe muscle fibres exhibit an increased expression and activity of the sarcoplasmic reticulum Ca2+-ATPase. Chemical crosslinking studies demonstrated impaired calsequestrin oligomerization in mdx gastrocnemius muscle indicating that abnormal calsequestrin clustering is involved in reduced Ca2+ buffering of the dystrophic sarcoplasmic reticulum. Previous studies have mostly attributed the sparing of certain mdx fibres to the special protective properties of small-diameter fibres. Our study suggests that the rescue of dystrophin-associated glycoproteins, and possibly the increased removal of cytosolic Ca2+ ions, might also play an important role in protecting muscle cells from necrotic changes.
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Affiliation(s)
- Paul Dowling
- Department of Biology, National University of Ireland, Maynooth, County Kildare, Ireland
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42
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Shin DW, Pan Z, Kim EK, Lee JM, Bhat MB, Parness J, Kim DH, Ma J. A retrograde signal from calsequestrin for the regulation of store-operated Ca2+ entry in skeletal muscle. J Biol Chem 2003; 278:3286-92. [PMID: 12419813 DOI: 10.1074/jbc.m209045200] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Calsequestrin (CSQ) is a high capacity Ca(2+)-binding protein present in the lumen of sarcoplasmic reticulum (SR) in striated muscle cells and has been shown to regulate the ryanodine receptor Ca(2+) release channel activity through interaction with other proteins present in the SR. Here we show that overexpression of wild-type CSQ or a CSQ mutant lacking the junction binding region (amino acids 86-191; Delta junc-CSQ) in mouse skeletal C2C12 myotube enhanced caffeine- and voltage-induced Ca(2+) release by increasing the Ca(2+) load in SR, whereas overexpression of a mutant CSQ lacking a Ca(2+) binding, aspartate-rich domain (amino acids 352-367; Delta asp-CSQ) showed the opposite effects. Depletion of SR Ca(2+) by thapsigargin initiated store-operated Ca(2+) entry (SOCE) in C2C12 myotubes. A large component of SOCE was inhibited by overexpression of wild-type CSQ or Delta junc-CSQ, whereas myotubes transfected with Delta asp-CSQ exhibited normal function of SOCE. These results indicate that the aspartate-rich segment of CSQ, under conditions of overexpression, can sustain structural interactions that interfere with the SOCE mechanism. Such retrograde activation mechanisms are possibly taking place at the junctional site of the SR.
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Affiliation(s)
- Dong Wook Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
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43
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Kim E, Shin DW, Hong CS, Jeong D, Kim DH, Park WJ. Increased Ca2+ storage capacity in the sarcoplasmic reticulum by overexpression of HRC (histidine-rich Ca2+ binding protein). Biochem Biophys Res Commun 2003; 300:192-6. [PMID: 12480542 DOI: 10.1016/s0006-291x(02)02829-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The histidine-rich Ca(2+) binding protein (HRC) is a high capacity Ca(2+) binding protein in the sarcoplasmic reticulum (SR). Because HRC appears to interact directly with triadin, HRC may play a role in the regulation of Ca(2+) release during excitation-contraction coupling. In this study, we examined the physiological effects of HRC overexpression in rat neonatal cardiomyocytes. Both caffeine-induced and depolarization-induced Ca(2+) release from the SR were increased significantly in the HRC overexpressing cardiomyocytes. Consistently, the Ca(2+) content, normally depleted from the SR in the presence of cyclopiazonic acid (CPA), remained elevated in these cells. In contrast, the density and the ryanodine-binding kinetics of the ryanodine receptor (RyR)/Ca(2+) release channel were slightly reduced or not significantly altered in the HRC overexpressing cardiomyocytes. We suggest that HRC is involved in the regulation of releasable Ca(2+) content into the SR.
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Affiliation(s)
- Eunyoung Kim
- Department of Life Science and National Research Laboratory of Proteolysis, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong, Puk-gu, Kwangju 500-712, South Korea
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44
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Abstract
The ryanodine receptors (RyRs) are a family of Ca2+ release channels found on intracellular Ca2+ storage/release organelles. The RyR channels are ubiquitously expressed in many types of cells and participate in a variety of important Ca2+ signaling phenomena (neurotransmission, secretion, etc.). In striated muscle, the RyR channels represent the primary pathway for Ca2+ release during the excitation-contraction coupling process. In general, the signals that activate the RyR channels are known (e.g., sarcolemmal Ca2+ influx or depolarization), but the specific mechanisms involved are still being debated. The signals that modulate and/or turn off the RyR channels remain ambiguous and the mechanisms involved unclear. Over the last decade, studies of RyR-mediated Ca2+ release have taken many forms and have steadily advanced our knowledge. This robust field, however, is not without controversial ideas and contradictory results. Controversies surrounding the complex Ca2+ regulation of single RyR channels receive particular attention here. In addition, a large body of information is synthesized into a focused perspective of single RyR channel function. The present status of the single RyR channel field and its likely future directions are also discussed.
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Affiliation(s)
- Michael Fill
- Department of Physiology, Loyola University Chicago, Maywood, Illinois 60153, USA
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45
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Wetzel P, Kleinke T, Papadopoulos S, Gros G. Inhibition of muscle carbonic anhydrase slows the Ca(2+) transient in rat skeletal muscle fibers. Am J Physiol Cell Physiol 2002; 283:C1242-53. [PMID: 12225987 DOI: 10.1152/ajpcell.00106.2002] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A countertransport of H(+) is coupled to Ca(2+) transport across the sarcoplasmic reticulum (SR) membrane. We propose that SR carbonic anhydrase (CA) accelerates the CO(2)-HCO reaction so that H(+) ions, which are exchanged for Ca(2+) ions, are produced or buffered in the SR at sufficient rates. Inhibition of this SR-CA is expected to reduce the rate of H(+) fluxes, which then will retard the kinetics of Ca(2+) transport. Fura 2 signals and isometric force were simultaneously recorded in fiber bundles of the soleus (SOL) and extensor digitorum longus (EDL) from rats in the absence and presence of the lipophilic CA inhibitors L-645151, chlorzolamide (CLZ), and ethoxzolamide (ETZ), as well as the hydrophilic inhibitor acetazolamide (ACTZ). Fura 2 and force signals were analyzed for time to peak (TTP), 50% decay time (t(50)), and their amplitudes. L-645151, CLZ, and ETZ significantly increased TTP of fura 2 by 10-25 ms in SOL and by 5-7 ms in EDL and TTP of force by 6-30 ms in both muscles. L-645151 and ETZ significantly prolonged t(50) of fura 2 and force by 20-55 and 40-160 ms, respectively, in SOL and EDL. L-645151, CLZ, and ETZ also increased peak force of single twitches and amplitudes of fura fluorescence ratio (R(340/380)) at an excitation wavelength of 340 to 380 nm. All effects of CA inhibitors on fura 2 and force signals could be reversed. ACTZ did not affect TTP, t(50), and amplitudes of fura 2 signals or force. L-645151, CLZ, and ETZ had no effects on myosin-, Ca(2+)-, and Na(+)-K(+)-ATPase activities, nor did they affect the amplitude and half-width of action potentials. We conclude that inhibition of SR-CA by impairing H(+) countertransport is responsible for deceleration of intracellular Ca(2+) transients and contraction times.
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Affiliation(s)
- Petra Wetzel
- Zentrum Physiologie, Medizinische Hochschule Hannover, Carl-Neuberg Strasse 1, 30625 Hannover, Germany.
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46
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Glover L, Quinn S, Ryan M, Pette D, Ohlendieck K. Supramolecular calsequestrin complex. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:4607-16. [PMID: 12230573 DOI: 10.1046/j.1432-1033.2002.03160.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
As recently demonstrated by overlay assays using calsequestrin-peroxidase conjugates, the major 63 kDa Ca(2+)-binding protein of the sarcoplasmic reticulum forms complexes with itself, and with junctin (26 kDa), triadin (94 kDa) and the ryanodine receptor (560 kDa) [Glover, L., Culligan, K., Cala, S., Mulvey, C. & Ohlendieck, K. (2001) Biochim. Biophys. Acta1515, 120-132]. Here, we show that variations in the relative abundance of these four central elements of excitation-contraction coupling in different fiber types, and during chronic electrostimulation-induced fiber type transitions, are reflected by distinct alterations in the calsequestrin overlay binding patterns. Comparative immunoblotting with antibodies to markers of the junctional sarcoplasmic reticulum, in combination with the calsequestrin overlay binding patterns, confirmed a lower ryanodine receptor expression in slow soleus muscle compared to fast fibers, and revealed a drastic reduction of the RyR1 isoform in chronic low-frequency stimulated tibialis anterior muscle. The fast-to-slow transition process included a distinct reduction in fast calsequestrin and triadin and a concomitant reduction in calsequestrin binding to these sarcoplasmic reticulum elements. The calsequestrin-binding protein junctin was not affected by the muscle transformation process. The increase in calsequestrin and decrease in junctin expression during postnatal development resulted in similar changes in the intensity of binding of the calsequestrin conjugate to these sarcoplasmic reticulum components. Aged skeletal muscle fibers tended towards reduced protein interactions within the calsequestrin complex. This agrees with the physiological concept that the key regulators of Ca(2+) homeostasis exist in a supramolecular membrane assembly and that protein-protein interactions are affected by isoform shifting underlying the finely tuned adaptation of muscle fibers to changed functional demands.
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Affiliation(s)
- Louise Glover
- Department of Pharmacology, University College Dublin, Belfield, Ireland
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47
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Hong CS, Kwak YG, Ji JH, Chae SW, Kim DH. Molecular cloning and characterization of mouse cardiac junctate isoforms. Biochem Biophys Res Commun 2001; 289:882-7. [PMID: 11735129 DOI: 10.1006/bbrc.2001.6056] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Junctate is a newly identified integral ER/SR membrane calcium binding protein, which is an alternative splicing form of the same gene generating aspartyl beta-hydroxylase and junctin. Screening a mouse heart cDNA library using canine junctin cDNA as a probe yielded three complete mouse heart cDNAs. One of the cDNAs is homologous to the previously reported human junctate. The three mouse junctate proteins are composed of 270, 259, and 215 amino acids (we named them junctate-1, -2, and -3). The apparent molecular masses of the mouse junctates in SDS-PAGE were in the range between 40 and 53 kDa. Northern and Western blot analyses indicate that mouse junctates are expressed in heart, brain, spleen, lung, liver, kidney, and stomach, but not in skeletal muscle. The apparent molecular weights of junctates from heart and brain were somewhat different from those from the other tissues tested, suggesting that there are tissue-specific expression patterns of the different junctate isoforms. Immunohistochemical studies showed that junctates were expressed both in ventricular and atrial tissues. This is the first study that shows the presence of 3 distinct cardiac junctate isoforms expressed in various mammalian tissues.
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Affiliation(s)
- C S Hong
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
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48
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Lee HG, Kang H, Kim DH, Park WJ. Interaction of HRC (histidine-rich Ca(2+)-binding protein) and triadin in the lumen of sarcoplasmic reticulum. J Biol Chem 2001; 276:39533-8. [PMID: 11504710 DOI: 10.1074/jbc.m010664200] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
HRC (histidine-rich Ca(2+) binding protein) has been identified from skeletal and cardiac muscle and shown to bind Ca(2+) with high capacity and low affinity. While HRC resides in the lumen of the sarcoplasmic reticulum, the physiological function of HRC is largely unknown. In the present study, we have performed co-immunoprecipitation experiments and show that HRC binds directly to triadin, which is an integral membrane protein of the sarcoplasmic reticulum. Using a fusion protein binding assay, we further identified the histidine-rich acidic repeats of HRC as responsible for the binding of HRC to triadin. These motifs may represent a novel protein-protein interaction domain. The HRC binding domain of triadin was also localized by fusion protein binding assay to the lumenal region containing the KEKE motif that was previously shown to be involved in the binding of triadin to calsequestrin. Notably, the interaction of HRC and triadin is Ca(2+)-sensitive. Our data suggest that HRC may play a role in the regulation of Ca(2+) release from the sarcoplasmic reticulum by interaction with triadin.
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Affiliation(s)
- H G Lee
- Department of Life Science and National Research Laboratory, Kwangju Institute of Science and Technology (K-JIST), 1 Oryong-dong, Puk-gu, Kwangju 500-712, Korea
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49
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Lambert IH, Nielsen JH, Andersen HJ, Ørtenblad N. Cellular model for induction of drip loss in meat. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2001; 49:4876-4883. [PMID: 11600038 DOI: 10.1021/jf010121y] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Drip loss from porcine muscle (M. longissimus dorsi) contained high concentrations of K(+) ( approximately 135 mM) and organic osmolytes, for example, taurine ( approximately 15 mM), as well as significant amounts of protein ( approximately 125 mg.mL(-1)). Thus, the drip reflects release of intramuscular components. To simulate events taking place at the time of slaughter and leading to release of osmolytes and subsequent formation of drip loss, C2C12 myotubes were exposed to anoxia and reduction in pH (from 7.4 to 6.0). Anoxia and acidification increased the cellular Ca(2+) concentration ([Ca(2+)](i)) at a rate of 22-32 nM.min(-)(1). The anoxia-induced increase in [Ca(2+)](i) was mainly due to influx via sarcolemmal Na(+) channels. As mammalian cells swell and release lysophospholipids during anoxia, C2C12 cells and primary porcine muscle cells were exposed to either hypotonic shock or lysophosphatidylcholine (LPC) and the release of taurine was followed. The swelling-induced taurine efflux was blocked in the presence of the anion channel blocker (DIDS), the 5-lipooxygenase inhibitors (ETH 615-139 and NDGA) but unaffected by the presence of vitamin E. In contrast, the LPC-induced taurine release was unaffected by DIDS but abolished by antioxidants (butylated hydroxytoluene and vitamin E). Thus, stress-induced taurine release from muscles may precede by two different mechanisms, one being 5-lipooxygenase dependent and the other involving generation of reactive oxygen species. A model for the cellular events, preceding formation of drip in meat, is presented.
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Affiliation(s)
- I H Lambert
- Biochemical Department, The August Krogh Institute, Universitetsparken 13, DK-2100 Copenhagen, Denmark.
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50
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Laver DR, Eager KR, Taoube L, Lamb GD. Effects of cytoplasmic and luminal pH on Ca(2+) release channels from rabbit skeletal muscle. Biophys J 2000; 78:1835-51. [PMID: 10733964 PMCID: PMC1300778 DOI: 10.1016/s0006-3495(00)76733-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ryanodine receptor (RyR)-Ca(2+) release channels from rabbit skeletal muscle were incorporated into lipid bilayers. The effects of cytoplasmic and luminal pH were studied separately over the pH range 5-8, using half-unit intervals. RyR activity (at constant luminal pH of 7.5) was inhibited at acidic cytoplasmic pH, with a half-inhibitory pH (pH(I)) approximately 6.5, irrespective of bilayer potential and of whether the RyRs were activated by cytoplasmic Ca(2+) (50 microM), ATP (2 or 5 mM), or both. Inhibition occurred within approximately 1 s and could be fully reversed within approximately 1 s after brief inhibition or within approximately 30-60 s after longer exposure to acidic cytosolic pH. There was no evidence of any hysteresis in the cytoplasmic pH effect. Ryanodine-modified channels were less sensitive to pH inhibition, with pH(I) at approximately 5.5, but the inhibition was similarly reversible. Steady-state open and closed dwell times of RyRs during cytoplasmic pH inhibition suggest a mechanism where the binding of one proton inhibits the channel and the binding of two to three additional protons promotes further inhibited states. RyR activity was unaffected by luminal pH in the pH range 7.5 to 6.0. At lower luminal pH (5-5.5) most RyRs were completely inhibited, and raising the pH again produced partial to full recovery in only approximately 50% of cases, with the extent of recovery not detectably different between pH 7.5 and pH 9. The results indicate that isolated skeletal muscle RyRs are not inhibited as strongly by low cytoplasmic and luminal pH, as suggested by previous single-channel studies.
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Affiliation(s)
- D R Laver
- Division of Biochemistry and Molecular Biology, Faculty of Science, Australian National University, Canberra, ACT 2601, Australia
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