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Gao H, Wang Z, Yang F, Wang X, Wang S, Zhang Q, Liu X, Sun Y, Kong J, Yao J. Graphene-integrated mesh electronics with converged multifunctionality for tracking multimodal excitation-contraction dynamics in cardiac microtissues. Nat Commun 2024; 15:2321. [PMID: 38485708 PMCID: PMC10940632 DOI: 10.1038/s41467-024-46636-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Accepted: 03/05/2024] [Indexed: 03/18/2024] Open
Abstract
Cardiac microtissues provide a promising platform for disease modeling and developmental studies, which require the close monitoring of the multimodal excitation-contraction dynamics. However, no existing assessing tool can track these multimodal dynamics across the live tissue. We develop a tissue-like mesh bioelectronic system to track these multimodal dynamics. The mesh system has tissue-level softness and cell-level dimensions to enable stable embedment in the tissue. It is integrated with an array of graphene sensors, which uniquely converges both bioelectrical and biomechanical sensing functionalities in one device. The system achieves stable tracking of the excitation-contraction dynamics across the tissue and throughout the developmental process, offering comprehensive assessments for tissue maturation, drug effects, and disease modeling. It holds the promise to provide more accurate quantification of the functional, developmental, and pathophysiological states in cardiac tissues, creating an instrumental tool for improving tissue engineering and studies.
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Affiliation(s)
- Hongyan Gao
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Zhien Wang
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Feiyu Yang
- Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Xiaoyu Wang
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Siqi Wang
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Quan Zhang
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Xiaomeng Liu
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Yubing Sun
- Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA, 01003, USA
- Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA, 01003, USA
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA, 01003, USA
| | - Jing Kong
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Jun Yao
- Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, 01003, USA.
- Institute for Applied Life Sciences, University of Massachusetts, Amherst, MA, 01003, USA.
- Department of Biomedical Engineering, University of Massachusetts, Amherst, MA, 01003, USA.
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2
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Cisco LA, Sipple MT, Edwards KM, Thornton CA, Lueck JD. Verapamil mitigates chloride and calcium bi-channelopathy in a myotonic dystrophy mouse model. J Clin Invest 2024; 134:e173576. [PMID: 38165038 PMCID: PMC10760957 DOI: 10.1172/jci173576] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/23/2023] [Indexed: 01/03/2024] Open
Abstract
Myotonic dystrophy type 1 (DM1) involves misregulated alternative splicing for specific genes. We used exon or nucleotide deletion to mimic altered splicing of genes central to muscle excitation-contraction coupling in mice. Mice with forced skipping of exon 29 in the CaV1.1 calcium channel combined with loss of ClC-1 chloride channel function displayed markedly reduced lifespan, whereas other combinations of splicing mimics did not affect survival. The Ca2+/Cl- bi-channelopathy mice exhibited myotonia, weakness, and impairment of mobility and respiration. Chronic administration of the calcium channel blocker verapamil rescued survival and improved force generation, myotonia, and respiratory function. These results suggest that Ca2+/Cl- bi-channelopathy contributes to muscle impairment in DM1 and is potentially mitigated by common clinically available calcium channel blockers.
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Affiliation(s)
| | | | | | - Charles A. Thornton
- Department of Neurology
- Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
| | - John D. Lueck
- Department of Pharmacology and Physiology
- Department of Neurology
- Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
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3
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Zhang Z, Brugada P, Weiss JN, Qu Z. Phase 2 Re-Entry Without I to: Role of Sodium Channel Kinetics in Brugada Syndrome Arrhythmias. JACC Clin Electrophysiol 2023; 9:2459-2474. [PMID: 37831035 PMCID: PMC11348283 DOI: 10.1016/j.jacep.2023.08.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 07/27/2023] [Accepted: 08/23/2023] [Indexed: 10/14/2023]
Abstract
BACKGROUND In Brugada syndrome (BrS), phase 2 re-excitation/re-entry (P2R) induced by the transient outward potassium current (Ito) is a proposed arrhythmia mechanism; yet, the most common genetic defects are loss-of-function sodium channel mutations. OBJECTIVES The authors used computer simulations to investigate how sodium channel dysfunction affects P2R-mediated arrhythmogenesis in the presence and absence of Ito. METHODS Computer simulations were carried out in 1-dimensional cables and 2-dimensional tissue using guinea pig and human ventricular action potential models. RESULTS In the presence of Ito sufficient to generate robust P2R, reducing sodium current (INa) peak amplitude alone only slightly potentiated P2R. When INa inactivation kinetics were also altered to simulate reported effects of BrS mutations and sodium channel blockers, however, P2R occurred even in the absence of Ito. These effects could be potentiated by delaying L-type calcium channel activation or increasing ATP-sensitive potassium current, consistent with experimental and clinical findings. INa-mediated P2R also accounted for sex-related, day and night-related, and fever-related differences in arrhythmia risk in BrS patients. CONCLUSIONS Altered INa kinetics synergize powerfully with reduced INa amplitude to promote P2R-induced arrhythmias in BrS in the absence of Ito, establishing a robust mechanistic link between altered INa kinetics and the P2R-mediated arrhythmia mechanism.
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Affiliation(s)
- Zhaoyang Zhang
- Department of Physics, School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang, China; Division of Cardiology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Pedro Brugada
- Heart Rhythm Management Centre, Postgraduate Program in Cardiac Electrophysiology and Pacing, Universitair Ziekenhuis Brussel-Vrije Universiteit Brussel, European Reference Networks Guard-Heart, Brussels, Belgium
| | - James N Weiss
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - Zhilin Qu
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, California, USA.
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4
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Docken SS, Clancy CE, Lewis TJ. Rate-dependent effects of state-specific sodium channel blockers in cardiac tissue: Insights from idealized models. J Theor Biol 2023; 573:111595. [PMID: 37562674 DOI: 10.1016/j.jtbi.2023.111595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 06/08/2023] [Accepted: 08/01/2023] [Indexed: 08/12/2023]
Abstract
A common side effect of pharmaceutical drugs is an increased propensity for cardiac arrhythmias. Many drugs bind to cardiac ion-channels in a state-specific manner, which alters the ionic conductances in complicated ways, making it difficult to identify the mechanisms underlying pro-arrhythmic drug effects. To better understand the fundamental mechanisms underlying the diverse effects of state-dependent sodium (Na+) channel blockers on cellular excitability, we consider two canonical motifs of drug-ion-channel interactions and compare the effects of Na+ channel blockers on the rate-dependence of peak upstroke velocity, conduction velocity, and vulnerable window size. In the literature, both motifs are referred to as "guarded receptor," but here we distinguish between state-specific binding that does not alter channel gating (referred to here as "guarded receptor") and state-specific binding that blocks certain gating transitions ("gate immobilization"). For each drug binding motif, we consider drugs that bind to the inactivated state and drugs that bind to the non-inactivated state of the Na+ channel. Exploiting the idealized nature of the canonical binding motifs, we identify the fundamental mechanisms underlying the effects on excitability of the various binding interactions. Specifically, we derive the voltage-dependence of the drug binding time constants and the equilibrium fractions of channels bound to drug, and we then derive a formula that incorporates these time constants and equilibrium fractions to elucidate the fundamental mechanisms. In the case of charged drug, we find that drugs that bind to inactivated channels exhibit greater rate-dependence than drugs that bind to non-inactivated channels. For neutral drugs, the effects of guarded receptor interactions are rate-independent, and we describe a novel mechanism for reverse rate-dependence resulting from neutral drug binding to non-inactivated channels via the gate immobilization motif.
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Affiliation(s)
- Steffen S Docken
- Department of Mathematics, University of California Davis, Davis, CA, USA; Department of Physiology and Membrane Biology, University of California Davis, Davis, CA, USA.
| | - Colleen E Clancy
- Department of Physiology and Membrane Biology, University of California Davis, Davis, CA, USA
| | - Timothy J Lewis
- Department of Mathematics, University of California Davis, Davis, CA, USA
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5
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Cisco LA, Sipple MT, Edwards KM, Thornton CA, Lueck JD. Combinatorial chloride and calcium channelopathy in myotonic dystrophy. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.29.542752. [PMID: 37398406 PMCID: PMC10312834 DOI: 10.1101/2023.05.29.542752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Myotonic dystrophy type 1 (DM1) involves misregulated alternative splicing for specific genes. We used exon or nucleotide deletion to mimic altered splicing of genes central to muscle excitation-contraction coupling processes in mice. Mice with forced-skipping of exon 29 in CaV1.1 calcium channel combined with loss of ClC-1 chloride channel function showed a markedly reduced lifespan, whereas other combinations of splicing mimics did not affect survival. The Ca2+/Cl- bi-channelopathy mice exhibited myotonia, weakness, and impairment of mobility and respiration. Chronic administration of the calcium channel blocker verapamil rescued survival and improved force generation, myotonia, and respiratory function. These results suggest that Ca2+/Cl- bi-channelopathy contributes to muscle impairment in DM1 and is potentially mitigated by common clinically available calcium channel blockers.
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Affiliation(s)
- Lily A. Cisco
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Matthew T. Sipple
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Katherine M. Edwards
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Charles A. Thornton
- Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, Rochester, NY 14642, USA
- Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, Rochester, NY 14642, USA
| | - John D. Lueck
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
- Department of Neurology, University of Rochester School of Medicine and Dentistry, Rochester, Rochester, NY 14642, USA
- Center for RNA Biology, University of Rochester School of Medicine and Dentistry, Rochester, Rochester, NY 14642, USA
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6
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Filippini L, Ortner NJ, Kaserer T, Striessnig J. Ca v 1.3-selective inhibitors of voltage-gated L-type Ca 2+ channels: Fact or (still) fiction? Br J Pharmacol 2023; 180:1289-1303. [PMID: 36788128 PMCID: PMC10953394 DOI: 10.1111/bph.16060] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/17/2022] [Accepted: 01/29/2023] [Indexed: 02/16/2023] Open
Abstract
Voltage-gated L-type Ca2+ -channels (LTCCs) are the target of Ca2+ -channel blockers (CCBs), which are in clinical use for the evidence-based treatment of hypertension and angina. Their cardiovascular effects are largely mediated by the Cav 1.2-subtype. However, based on our current understanding of their physiological and pathophysiological roles, Cav 1.3 LTCCs also appear as attractive drug targets for the therapy of various diseases, including treatment-resistant hypertension, spasticity after spinal cord injury and neuroprotection in Parkinson's disease. Since CCBs inhibit both Cav 1.2 and Cav 1.3, Cav 1.3-selective inhibitors would be valuable tools to validate the therapeutic potential of Cav 1.3 channel inhibition in preclinical models. Despite a number of publications reporting the discovery of Cav 1.3-selective blockers, their selectivity remains controversial. We conclude that at present no pharmacological tools exist that are suitable to confirm or refute a role of Cav 1.3 channels in cellular responses. We also suggest essential criteria for a small molecule to be considered Cav 1.3-selective.
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Affiliation(s)
- Ludovica Filippini
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
- Department of Pharmaceutical Chemistry, Institute of PharmacyUniversity of InnsbruckInnsbruckAustria
| | - Nadine J. Ortner
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
| | - Teresa Kaserer
- Department of Pharmaceutical Chemistry, Institute of PharmacyUniversity of InnsbruckInnsbruckAustria
| | - Jörg Striessnig
- Department of Pharmacology and Toxicology and Center of Molecular BiosciencesUniversity of InnsbruckInnsbruckAustria
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7
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Straub CJ, Rusali LE, Kremiller KM, Riley AP. What We Have Gained from Ibogaine: α3β4 Nicotinic Acetylcholine Receptor Inhibitors as Treatments for Substance Use Disorders. J Med Chem 2023; 66:107-121. [PMID: 36440853 PMCID: PMC10034762 DOI: 10.1021/acs.jmedchem.2c01562] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
For decades, ibogaine─the main psychoactive alkaloid found in Tabernanthe iboga─has been investigated as a possible treatment for substance use disorders (SUDs) due to its purported ability to interrupt the addictive properties of multiple drugs of abuse. Of the numerous pharmacological actions of ibogaine and its derivatives, the inhibition of α3β4 nicotinic acetylcholine receptors (nAChRs), represents a probable mechanism of action for their apparent anti-addictive activity. In this Perspective, we examine several classes of compounds that have been discovered and developed to target α3β4 nAChRs. Specifically, by focusing on compounds that have proven efficacious in pre-clinical models of drug abuse and have been evaluated clinically, we highlight the promising potential of the α3β4 nAChRs as viable targets to treat a wide array of SUDs. Additionally, we discuss the challenges faced by the existing classes of α3β4 nAChR ligands that must be overcome to develop them into therapeutic treatments.
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Affiliation(s)
- Carolyn J Straub
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Lisa E Rusali
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Kyle M Kremiller
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
| | - Andrew P Riley
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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8
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Abstract
The CACNA1C gene encodes the pore-forming subunit of the CaV1.2 L-type Ca2+ channel, a critical component of membrane physiology in multiple tissues, including the heart, brain, and immune system. As such, mutations altering the function of these channels have the potential to impact a wide array of cellular functions. The first mutations identified within CACNA1C were shown to cause a severe, multisystem disorder known as Timothy syndrome (TS), which is characterized by neurodevelopmental deficits, long-QT syndrome, life-threatening cardiac arrhythmias, craniofacial abnormalities, and immune deficits. Since this initial description, the number and variety of disease-associated mutations identified in CACNA1C have grown tremendously, expanding the range of phenotypes observed in affected patients. CACNA1C channelopathies are now known to encompass multisystem phenotypes as described in TS, as well as more selective phenotypes where patients may exhibit predominantly cardiac or neurological symptoms. Here, we review the impact of genetic mutations on CaV1.2 function and the resultant physiological consequences.
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Affiliation(s)
- Kevin G Herold
- Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - John W Hussey
- Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Ivy E Dick
- Department of Physiology, University of Maryland School of Medicine, Baltimore, MD, USA.
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9
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Bamgboye MA, Traficante MK, Owoyemi J, DiSilvestre D, Vieira DCO, Dick IE. Impaired Ca V1.2 inactivation reduces the efficacy of calcium channel blockers in the treatment of LQT8. J Mol Cell Cardiol 2022; 173:92-100. [PMID: 36272554 PMCID: PMC10583761 DOI: 10.1016/j.yjmcc.2022.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/12/2022] [Accepted: 10/16/2022] [Indexed: 11/23/2022]
Abstract
Mutations in the CaV1.2 L-type calcium channel can cause a profound form of long-QT syndrome known as long-QT type 8 (LQT8), which results in cardiac arrhythmias that are often fatal in early childhood. A growing number of such pathogenic mutations in CaV1.2 have been identified, increasing the need for targeted therapies. As many of these mutations reduce channel inactivation; resulting in excess Ca2+ entry during the action potential, calcium channel blockers (CCBs) would seem to represent a promising treatment option. Yet CCBs have been unsuccessful in the treatment of LQT8. Here, we demonstrate that this lack of efficacy likely stems from the impact of the mutations on CaV1.2 channel inactivation. As CCBs are known to preferentially bind to the inactivated state of the channel, mutation-dependent deficits in inactivation result in a decrease in use-dependent block of the mutant channel. Further, application of the CCB verapamil to induced pluripotent stem cell (iPSC) derived cardiomyocytes from an LQT8 patient demonstrates that this loss of use-dependent block translates to a lack of efficacy in correcting the LQT phenotype. As a growing number of channelopathic mutations demonstrate effects on channel inactivation, reliance on state-dependent blockers may leave a growing population of patients without a viable treatment option. This biophysical understanding of the interplay between inactivation deficits and state-dependent block may provide a new avenue to guide the development of improved therapies.
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Affiliation(s)
- Moradeke A Bamgboye
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America
| | - Maria K Traficante
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America
| | - Josiah Owoyemi
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America
| | - Deborah DiSilvestre
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America
| | - Daiana C O Vieira
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America
| | - Ivy E Dick
- Department of Physiology, University of Maryland, School of Medicine, Baltimore, MD, United States of America.
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10
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Experimental factors that impact CaV1.2 channel pharmacology-Effects of recording temperature, charge carrier, and quantification of drug effects on the step and ramp currents elicited by the "step-step-ramp" voltage protocol. PLoS One 2022; 17:e0276995. [PMID: 36417390 PMCID: PMC9683570 DOI: 10.1371/journal.pone.0276995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 10/18/2022] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND PURPOSE CaV1.2 channels contribute to action potential upstroke in pacemaker cells, plateau potential in working myocytes, and initiate excitation-contraction coupling. Understanding drug action on CaV1.2 channels may inform potential impact on cardiac function. However, literature shows large degrees of variability between CaV1.2 pharmacology generated by different laboratories, casting doubt regarding the utility of these data to predict or interpret clinical outcomes. This study examined experimental factors that may impact CaV1.2 pharmacology. EXPERIMENTAL APPROACH Whole cell recordings were made on CaV1.2 overexpression cells. Current was evoked using a "step-step-ramp" waveform that elicited a step and a ramp current. Experimental factors examined were: 1) near physiological vs. room temperature for recording, 2) drug inhibition of the step vs. the ramp current, and 3) Ca2+ vs. Ba2+ as the charge carrier. Eight drugs were studied. KEY RESULTS CaV1.2 current exhibited prominent rundown, exquisite temperature sensitivity, and required a high degree of series resistance compensation to optimize voltage control. Temperature-dependent effects were examined for verapamil and methadone. Verapamil's block potency shifted by up to 4X between room to near physiological temperature. Methadone exhibited facilitatory and inhibitory effects at near physiological temperature, and only inhibitory effect at room temperature. Most drugs inhibited the ramp current more potently than the step current-a preference enhanced when Ba2+ was the charge carrier. The slopes of the concentration-inhibition relationships for many drugs were shallow, temperature-dependent, and differed between the step and the ramp current. CONCLUSIONS AND IMPLICATIONS All experimental factors examined affected CaV1.2 pharmacology. In addition, whole cell CaV1.2 current characteristics-rundown, temperature sensitivity, and impact of series resistance-are also factors that can impact pharmacology. Drug effects on CaV1.2 channels appear more complex than simple pore block mechanism. Normalizing laboratory-specific approaches is key to improve inter-laboratory data reproducibility. Releasing original electrophysiology records is essential to promote transparency and enable the independent evaluation of data quality.
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11
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Orecchioni M, Matsunami H, Ley K. Olfactory receptors in macrophages and inflammation. Front Immunol 2022; 13:1029244. [PMID: 36311776 PMCID: PMC9606742 DOI: 10.3389/fimmu.2022.1029244] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 09/23/2022] [Indexed: 12/30/2022] Open
Abstract
Olfactory receptors (ORs) that bind odorous ligands are the largest family of G-protein-coupled receptors. In the olfactory epithelium, approximately 400 and 1,100 members are expressed in humans and mice, respectively. Growing evidence suggests the extranasal functions of ORs. Here, we review OR expression and function in macrophages, specialized innate immune cells involved in the detection, phagocytosis, and destruction of cellular debris and pathogens as well as the initiation of inflammatory responses. RNA sequencing data in mice suggest that up to 580 ORs may be expressed in macrophages. Macrophage OR expression is increased after treatment with the Toll-like receptor 4 ligand lipopolysaccharide, which also induces the transcription of inflammasome components. Triggering human OR6A2 or its mouse orthologue Olfr2 with their cognate ligand octanal induces inflammasome assembly and the secretion of IL-1β, which exacerbates atherosclerosis. Octanal is positively correlated with blood lipids like low-density lipoprotein -cholesterol in humans. Another OR, Olfr78, is activated by lactate, which promotes the generation of tumor-associated macrophages that dampen the immune response and promote tumor progression. Olfactory receptors in macrophages are a rich source of untapped opportunity for modulating inflammation. It is not known which of the many ORs expressed in macrophages promote or modulate inflammation. Progress in this area also requires deorphanizing more ORs and determining the sources of their ligands.
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Affiliation(s)
- Marco Orecchioni
- Department of Inflammation Biology, La Jolla Institute for Immunology, La Jolla, CA, United States,*Correspondence: Marco Orecchioni, ; Klaus Ley,
| | - Hiroaki Matsunami
- Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC, United States
| | - Klaus Ley
- Department of Inflammation Biology, La Jolla Institute for Immunology, La Jolla, CA, United States,Immunology Center of Georgia, Augusta University, Augusta, GA, United States,*Correspondence: Marco Orecchioni, ; Klaus Ley,
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12
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Fakhar M, Najumuddin, Zahid S, Rashid S. Structural basis of Klotho binding to VEGFR2 and TRPC1 and repurposing calcium channel blockers as TRPC1 antagonists for the treatment of age-related cardiac hypertrophy. Arch Biochem Biophys 2022; 719:109171. [DOI: 10.1016/j.abb.2022.109171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 12/13/2021] [Accepted: 02/28/2022] [Indexed: 11/15/2022]
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13
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Silva RCMC, Ribeiro JS, da Silva GPD, da Costa LJ, Travassos LH. Autophagy Modulators in Coronavirus Diseases: A Double Strike in Viral Burden and Inflammation. Front Cell Infect Microbiol 2022; 12:845368. [PMID: 35433503 PMCID: PMC9010404 DOI: 10.3389/fcimb.2022.845368] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 03/02/2022] [Indexed: 12/12/2022] Open
Abstract
Coronaviruses are the etiologic agents of several diseases. Coronaviruses of critical medical importance are characterized by highly inflammatory pathophysiology, involving severe pulmonary impairment and infection of multiple cell types within the body. Here, we discuss the interplay between coronaviruses and autophagy regarding virus life cycle, cell resistance, and inflammation, highlighting distinct mechanisms by which autophagy restrains inflammatory responses, especially those involved in coronavirus pathogenesis. We also address different autophagy modulators available and the rationale for drug repurposing as an attractive adjunctive therapy. We focused on pharmaceuticals being tested in clinical trials with distinct mechanisms but with autophagy as a common target. These autophagy modulators act in cell resistance to virus infection and immunomodulation, providing a double-strike to prevent or treat severe disease development and death from coronaviruses diseases.
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Affiliation(s)
- Rafael Cardoso Maciel Costa Silva
- Laboratório de Imunoreceptores e Sinalização Celular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jhones Sousa Ribeiro
- Laboratório de Imunoreceptores e Sinalização Celular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gustavo Peixoto Duarte da Silva
- Laboratório de Genética e Imunologia das Infecções Virais, Departamento de Virologia, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Luciana Jesus da Costa
- Laboratório de Genética e Imunologia das Infecções Virais, Departamento de Virologia, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leonardo Holanda Travassos
- Laboratório de Imunoreceptores e Sinalização Celular, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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14
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Nagarajan S, Poyer F, Fourmois L, Naud‐Martin D, Medjoubi K, Somogyi A, Schanne G, Henry L, Delsuc N, Policar C, Bertrand HC, Mahuteau‐Betzer F. Cellular Detection of a Mitochondria Targeted Brominated Vinyl Triphenylamine Optical Probe (TP−Br) by X‐Ray Fluorescence Microscopy. Chemistry 2022; 28:e202104424. [DOI: 10.1002/chem.202104424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Indexed: 11/06/2022]
Affiliation(s)
- Sounderya Nagarajan
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Institut Curie Université PSL 91400 Orsay France
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Université Paris-Saclay 91400 Orsay France
| | - Florent Poyer
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Institut Curie Université PSL 91400 Orsay France
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Université Paris-Saclay 91400 Orsay France
| | - Laura Fourmois
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Institut Curie Université PSL 91400 Orsay France
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Université Paris-Saclay 91400 Orsay France
| | - Delphine Naud‐Martin
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Institut Curie Université PSL 91400 Orsay France
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Université Paris-Saclay 91400 Orsay France
| | - Kadda Medjoubi
- Synchrotron SOLEIL, BP 48 Saint-Aubin 91192 Gif sur Yvette France
| | - Andrea Somogyi
- Synchrotron SOLEIL, BP 48 Saint-Aubin 91192 Gif sur Yvette France
| | - Gabrielle Schanne
- Laboratoire des biomolécules, LBM, Département de chimie Ecole normale supérieure PSL University Sorbonne université, CNRS 75005 Paris France
| | - Lucas Henry
- Laboratoire des biomolécules, LBM, Département de chimie Ecole normale supérieure PSL University Sorbonne université, CNRS 75005 Paris France
| | - Nicolas Delsuc
- Laboratoire des biomolécules, LBM, Département de chimie Ecole normale supérieure PSL University Sorbonne université, CNRS 75005 Paris France
| | - Clotilde Policar
- Laboratoire des biomolécules, LBM, Département de chimie Ecole normale supérieure PSL University Sorbonne université, CNRS 75005 Paris France
| | - Helene C. Bertrand
- Laboratoire des biomolécules, LBM, Département de chimie Ecole normale supérieure PSL University Sorbonne université, CNRS 75005 Paris France
| | - Florence Mahuteau‐Betzer
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Institut Curie Université PSL 91400 Orsay France
- CNRS UMR9187, Inserm U1196, Chemistry and Modeling for the Biology of Cancer Université Paris-Saclay 91400 Orsay France
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15
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Yang M, Guo Y, Zhang XP, Sun H, Wang Y, Zhang W, Wu Y, Jian Y, Gao Z. Natural Amino Acid L‐Phenylalanine Coordinated Zirconocene Complex as Bifunctional Catalyst for the Synthesis of 1,5‐Benzothiazepines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mingming Yang
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Yingying Guo
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Xue-Peng Zhang
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Huaming Sun
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Yanyan Wang
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Weiqiang Zhang
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Ya Wu
- Xi'an Shiyou University College of Chemistry and Chemical Engineering CHINA
| | - Yajun Jian
- Shaanxi Normal University School of Chemistry and Chemical Engineering CHINA
| | - Ziwei Gao
- Shaanxi Normal University School of Chemistry and Chemical Engineering 620 West Chang'an Street 710119 Xi'an CHINA
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16
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Straus MR, Bidon MK, Tang T, Jaimes JA, Whittaker GR, Daniel S. Inhibitors of L-Type Calcium Channels Show Therapeutic Potential for Treating SARS-CoV-2 Infections by Preventing Virus Entry and Spread. ACS Infect Dis 2021; 7:2807-2815. [PMID: 34498840 PMCID: PMC8442615 DOI: 10.1021/acsinfecdis.1c00023] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Indexed: 01/06/2023]
Abstract
COVID-19 is caused by a novel coronavirus, the severe acute respiratory syndrome coronavirus (CoV)-2 (SARS-CoV-2). The virus is responsible for an ongoing pandemic and concomitant public health crisis around the world. While vaccine development is proving to be highly successful, parallel drug development approaches are also critical in the response to SARS-CoV-2 and other emerging viruses. Coronaviruses require Ca2+ ions for host cell entry, and we have previously shown that Ca2+ modulates the interaction of the viral fusion peptide with host cell membranes. In an attempt to accelerate drug repurposing, we tested a panel of L-type calcium channel blocker (CCB) drugs currently developed for other conditions to determine whether they would inhibit SARS-CoV-2 infection in cell culture. All the CCBs tested showed varying degrees of inhibition, with felodipine and nifedipine strongly limiting SARS-CoV-2 entry and infection in epithelial lung cells at concentrations where cell toxicity was minimal. Further studies with pseudotyped particles displaying the SARS-CoV-2 spike protein suggested that inhibition occurs at the level of virus entry. Overall, our data suggest that certain CCBs have the potential to treat SARS-CoV-2 infections and are worthy of further examination for possible treatment of COVID-19.
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Affiliation(s)
- Marco R. Straus
- Department of Microbiology & Immunology, College
of Veterinary Medicine, Cornell University, Ithaca, New York
14853, United States
| | - Miya K. Bidon
- Robert Frederick Smith School of Chemical &
Biomolecular Engineering, Cornell University, Ithaca, New York
14853, United States
| | - Tiffany Tang
- Robert Frederick Smith School of Chemical &
Biomolecular Engineering, Cornell University, Ithaca, New York
14853, United States
| | - Javier A. Jaimes
- Department of Microbiology & Immunology, College
of Veterinary Medicine, Cornell University, Ithaca, New York
14853, United States
| | - Gary R. Whittaker
- Department of Microbiology & Immunology, College
of Veterinary Medicine, Cornell University, Ithaca, New York
14853, United States
- Master of Public Health Program, Cornell
University, Ithaca, New York 14853, United States
| | - Susan Daniel
- Robert Frederick Smith School of Chemical &
Biomolecular Engineering, Cornell University, Ithaca, New York
14853, United States
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17
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Tuluc P, Theiner T, Jacobo-Piqueras N, Geisler SM. Role of High Voltage-Gated Ca 2+ Channel Subunits in Pancreatic β-Cell Insulin Release. From Structure to Function. Cells 2021; 10:2004. [PMID: 34440773 PMCID: PMC8393260 DOI: 10.3390/cells10082004] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/27/2021] [Accepted: 08/03/2021] [Indexed: 02/07/2023] Open
Abstract
The pancreatic islets of Langerhans secrete several hormones critical for glucose homeostasis. The β-cells, the major cellular component of the pancreatic islets, secrete insulin, the only hormone capable of lowering the plasma glucose concentration. The counter-regulatory hormone glucagon is secreted by the α-cells while δ-cells secrete somatostatin that via paracrine mechanisms regulates the α- and β-cell activity. These three peptide hormones are packed into secretory granules that are released through exocytosis following a local increase in intracellular Ca2+ concentration. The high voltage-gated Ca2+ channels (HVCCs) occupy a central role in pancreatic hormone release both as a source of Ca2+ required for excitation-secretion coupling as well as a scaffold for the release machinery. HVCCs are multi-protein complexes composed of the main pore-forming transmembrane α1 and the auxiliary intracellular β, extracellular α2δ, and transmembrane γ subunits. Here, we review the current understanding regarding the role of all HVCC subunits expressed in pancreatic β-cell on electrical activity, excitation-secretion coupling, and β-cell mass. The evidence we review was obtained from many seminal studies employing pharmacological approaches as well as genetically modified mouse models. The significance for diabetes in humans is discussed in the context of genetic variations in the genes encoding for the HVCC subunits.
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Affiliation(s)
- Petronel Tuluc
- Centre for Molecular Biosciences, Department of Pharmacology and Toxicology, University of Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria; (T.T.); (N.J.-P.); (S.M.G.)
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18
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Ishida Y, Kitayama K, Hanada K, Shibutani S, Nishizaki K, Kinjo T, Endo T, Suzuki A, Tateyama S, Nishizaki F, Sukekawa T, Tanaka M, Osanai T, Okumura K, Tomita H. Diltiazem Inhibits Coronary Spasm via Inhibition of Cav1.2Phosphorylation and Protein Kinase C Activation in a Mouse Model of Coronary Spastic Angina. Int Heart J 2021; 62:910-918. [PMID: 34276002 DOI: 10.1536/ihj.20-366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Calcium antagonists are used for coronary spastic angina (CSA) treatment. We previously identified a phospholipase C (PLC) -δ1 gene variant that results in enhanced PLC activity in patients with CSA and developed a CSA animal model by generating vascular smooth muscle cell-specific human variant PLC-δ1 overexpression (PLC-TG) mice. In this study, we investigated the molecular mechanism of CSA using the PLC-TG mice and the inhibitory effect of a calcium antagonist, diltiazem hydrochloride (DL).We treated the PLC-TG and wild-type (WT) mice with oral DL or trichlormethiazide (TM) (control) for 2 weeks. Ergometrine injection-induced coronary spasm was observed on the electrocardiogram in all 5 PLC-TG mice treated with TM, but only in 1 of 5 PLC-TG mice treated with DL. Voltage-dependent calcium channel (Cav1.2) phosphorylation and protein kinase C (PKC) activity were enhanced in the aortas of PLC-TG mice treated with TM. DL treatment significantly inhibited Cav1.2 phosphorylation and PKC activity. Although total Cav1.2 expression was similar between WT and PLC-TG mice treated with TM, DL treatment significantly increased its expression in PLC-TG mice. Furthermore, its expression remained high after DL discontinuation. DL and PKC inhibitor suppressed intracellular calcium response to acetylcholine in cultured rat aortic smooth muscle cells transfected with variant PLC-δ1.These results indicate that enhanced PLC activity causes coronary spasm, presumably via enhanced Cav1.2 phosphorylation and PKC activity, both of which were inhibited by DL. Enhanced total Cav1.2 expression after DL discontinuation and high PKC activity may be an important mechanism underlying the calcium antagonist withdrawal syndrome.
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Affiliation(s)
- Yuji Ishida
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Kazutaka Kitayama
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Kenji Hanada
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Shuji Shibutani
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Kimitaka Nishizaki
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Takahiko Kinjo
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Tomohide Endo
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Akiko Suzuki
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Shunta Tateyama
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Fumie Nishizaki
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Takanori Sukekawa
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Makoto Tanaka
- Department of Cardiology, Hirosaki University Graduate School of Medicine
| | - Tomohiro Osanai
- Department of Nursing Science, Hirosaki University Graduate School of Health Sciences
| | - Ken Okumura
- Division of Cardiology, Saiseikai Kumamoto Hospital
| | - Hirofumi Tomita
- Department of Cardiology, Hirosaki University Graduate School of Medicine
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19
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Zimmer AM, Goss GG, Glover CN. Reductionist approaches to the study of ionoregulation in fishes. Comp Biochem Physiol B Biochem Mol Biol 2021; 255:110597. [PMID: 33781928 DOI: 10.1016/j.cbpb.2021.110597] [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: 01/05/2021] [Revised: 03/15/2021] [Accepted: 03/22/2021] [Indexed: 10/21/2022]
Abstract
The mechanisms underlying ionoregulation in fishes have been studied for nearly a century, and reductionist methods have been applied at all levels of biological organization in this field of research. The complex nature of ionoregulatory systems in fishes makes them ideally suited to reductionist methods and our collective understanding has been dramatically shaped by their use. This review provides an overview of the broad suite of techniques used to elucidate ionoregulatory mechanisms in fishes, from the whole-animal level down to the gene, discussing some of the advantages and disadvantages of these methods. We provide a roadmap for understanding and appreciating the work that has formed the current models of organismal, endocrine, cellular, molecular, and genetic regulation of ion balance in fishes and highlight the contribution that reductionist techniques have made to some of the fundamental leaps forward in the field throughout its history.
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Affiliation(s)
- Alex M Zimmer
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada.
| | - Greg G Goss
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada
| | - Chris N Glover
- Department of Biological Sciences, CW 405, Biological Sciences Bldg., University of Alberta, Edmonton, AB T6G 2E9, Canada; Faculty of Science and Technology and Athabasca River Basin Research Institute, Athabasca University, Athabasca, AB T9S 3A3, Canada
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20
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Shabbir W. T1143 essential for Ca V1.2 inhibition by diltiazem. Eur J Pharmacol 2021; 895:173889. [PMID: 33482177 DOI: 10.1016/j.ejphar.2021.173889] [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: 09/13/2020] [Revised: 01/07/2021] [Accepted: 01/13/2021] [Indexed: 11/15/2022]
Abstract
Careful analysis of previously published reports and some new insights into the structure activity studies revealed an important role of Threonine 1143 in drug binding. Substituting T1143 by alanine and other residues significantly reduced channel inhibition by qDil and Dil. Mutation T1143A did not affect channel activation or inactivation while almost completely diminishing channel block by Dil or qDil. These findings support the view that T1143 serves as drug binding determinant. Other mutations in this position than T1143A (T1143L/Y/S/N/C/V/E) diminished channel inhibition by qDil but additionally affected channel activation and inactivation and may therefore affect channel block allosterically. Collectively, our data suggest that T1143 is an essential diltiazem binding determinant.
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Affiliation(s)
- Waheed Shabbir
- Institute for Pharmacology and Toxicology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.
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21
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Raphel F, De Korte T, Lombardi D, Braam S, Gerbeau JF. A greedy classifier optimization strategy to assess ion channel blocking activity and pro-arrhythmia in hiPSC-cardiomyocytes. PLoS Comput Biol 2020; 16:e1008203. [PMID: 32976482 PMCID: PMC7549820 DOI: 10.1371/journal.pcbi.1008203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 10/12/2020] [Accepted: 07/28/2020] [Indexed: 02/05/2023] Open
Abstract
Novel studies conducting cardiac safety assessment using human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are promising but might be limited by their specificity and predictivity. It is often challenging to correctly classify ion channel blockers or to sufficiently predict the risk for Torsade de Pointes (TdP). In this study, we developed a method combining in vitro and in silico experiments to improve machine learning approaches in delivering fast and reliable prediction of drug-induced ion-channel blockade and proarrhythmic behaviour. The algorithm is based on the construction of a dictionary and a greedy optimization, leading to the definition of optimal classifiers. Finally, we present a numerical tool that can accurately predict compound-induced pro-arrhythmic risk and involvement of sodium, calcium and potassium channels, based on hiPSC-CM field potential data.
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Affiliation(s)
- Fabien Raphel
- Inria, Paris, France
- NOTOCORD part of Instem, Le Pecq, France
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22
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Mendes AS, Blascke de Mello MM, Parente JM, Omoto ACM, Neto-Neves EM, Fazan R, Tanus-Santos JE, Castro MM. Verapamil decreases calpain-1 and matrix metalloproteinase-2 activities and improves hypertension-induced hypertrophic cardiac remodeling in rats. Life Sci 2020; 244:117153. [DOI: 10.1016/j.lfs.2019.117153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/05/2019] [Accepted: 12/08/2019] [Indexed: 12/30/2022]
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23
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Breborowicz A, Knapowski J, Breborowicz G. Intracellular Calcium Ions Modulate Permeability of the Peritoneal MesotheliumIn Vitro. Perit Dial Int 2020. [DOI: 10.1177/089686088500500205] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The authors studied the in vitro effect of a calcium-channel-blocker -verapamil, local anesthetic -bupivacaine and a calcium ionophore -A23187 on the permeability of the monolayer mesothelium from the rabbit's mesentery. Verapamil and bupivacaine increased transmesothelial flux of calcium while A23187 increased calcium transport only transiently. Verapamil augmented the permeability of the mesothelium to inulin and urea. However A23187 decreased the transmesothelial flux of inulin only whereas it increased the transport of urea. From this study we have concluded, that intracellular calcium may determine the permeability of the peritoneal mesothelium.Various important biological processes like muscle contraction, secretion of transmitters and hormones, and control of epithelial permability seem to be dependent on intracellular calcium-ion activity (1–4). Our previous paper suggested that a local anesthetic, bupivacaine, produces its effect on the peritoneal mesothelium through interaction with the cytoskeleton of the epithelial cells, and with the mem brane's calcium transport (5). In addition Palant et al found that the permeability of another leaky epithelium, that from the Necturus gallbladder, depends on the extracellular calcium concentrations and may be altered by drugs, which interfere with the entrance of these ions into the epithelial cells (6). Therefore, we decided to study the role that calcium ions may play in the transport of solutes across the peritoneal mesothelium in vitro.
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Affiliation(s)
- Andrzej Breborowicz
- From the Department or Pathophysiology, Medical Academy, 60–781 Poznan, Poland, ul. Swiecickiego 6
| | - Jan Knapowski
- From the Department or Pathophysiology, Medical Academy, 60–781 Poznan, Poland, ul. Swiecickiego 6
| | - Grzegorz Breborowicz
- From the Department or Pathophysiology, Medical Academy, 60–781 Poznan, Poland, ul. Swiecickiego 6
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24
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Chen K, Chen W, Han B, Chen W, Liu M, Wu H. Sequential C-S and S-N Coupling Approach to Sulfonamides. Org Lett 2020; 22:1841-1845. [PMID: 32073282 DOI: 10.1021/acs.orglett.0c00183] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A one-pot three-component reaction involving nitroarenes, (hetero)arylboronic acids, and potassium pyrosulfite leading to sulfonamides was described. A broad range of sulfonamides bearing different reactive functional groups were obtained in good to excellent yields through sequential C-S and S-N coupling that does not require metal catalysts.
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Affiliation(s)
- Kai Chen
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Wei Chen
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Bing Han
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Wanzhi Chen
- Department of Chemistry, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Miaochang Liu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325027, China
| | - Huayue Wu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325027, China
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25
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Obradović D, Arsić A, Čarapić M, Agbaba D. Modeling of chromatographic retention of the selected antiarrhythmics and structurally related compounds in the hydrophilic interactions under the TLC and HPLC conditions. J LIQ CHROMATOGR R T 2020. [DOI: 10.1080/10826076.2020.1725551] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Darija Obradović
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
| | - Anđela Arsić
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
| | - Marija Čarapić
- Medicines and Medical Devices Agency of Serbia, Belgrade, Serbia
| | - Danica Agbaba
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia
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26
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Haworth RA. Use of Isolated Adult Myocytes to Evaluate Cardiotoxicity. II. Preparation and Properties*. Toxicol Pathol 2020. [DOI: 10.1177/019262339001804a01] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The preparation and properties of isolated adult cardiac myocytes are reviewed, with the goal being to evaluate their usefulness as a model system for measuring cardiotoxicity. Some important factors in cell isolation methodology which impact on the quality of the preparation are identified, along with criteria for assessing the quality of cells after isolation. By all criteria, myocytes isolated by good procedures appear to largely retain their original properties. Moreover, the distinctive behavior of adult myocytes under metabolic stress endows them with a particular usefulness as monitors of toxicity. Overall, we conclude that the art of adult heart cell isolation and culture is now sufficiently advanced for either freshly isolated cells in suspension or cells in culture to be a useful model system for toxicity studies.
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Affiliation(s)
- Robert A. Haworth
- Department of Anesthesiology, University of Wisconsin, Madison, Wisconsin
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27
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Catterall WA, Lenaeus MJ, Gamal El-Din TM. Structure and Pharmacology of Voltage-Gated Sodium and Calcium Channels. Annu Rev Pharmacol Toxicol 2020; 60:133-154. [PMID: 31537174 DOI: 10.1146/annurev-pharmtox-010818-021757] [Citation(s) in RCA: 132] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Voltage-gated sodium and calcium channels are evolutionarily related transmembrane signaling proteins that initiate action potentials, neurotransmission, excitation-contraction coupling, and other physiological processes. Genetic or acquired dysfunction of these proteins causes numerous diseases, termed channelopathies, and sodium and calcium channels are the molecular targets for several major classes of drugs. Recent advances in the structural biology of these proteins using X-ray crystallography and cryo-electron microscopy have given new insights into the molecular basis for their function and pharmacology. Here we review this recent literature and integrate findings on sodium and calcium channels to reveal the structural basis for their voltage-dependent activation, fast and slow inactivation, ion conductance and selectivity, and complex pharmacology at the atomic level. We conclude with the theme that new understanding of the diseases and therapeutics of these channels will be derived from application of the emerging structural principles from these recent structural analyses.
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Affiliation(s)
- William A Catterall
- Department of Pharmacology and Division of General Internal Medicine, Department of Medicine, University of Washington, Seattle, Washington 98195, USA;
| | - Michael J Lenaeus
- Department of Pharmacology and Division of General Internal Medicine, Department of Medicine, University of Washington, Seattle, Washington 98195, USA;
| | - Tamer M Gamal El-Din
- Department of Pharmacology and Division of General Internal Medicine, Department of Medicine, University of Washington, Seattle, Washington 98195, USA;
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28
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Prondzynski M, Lemoine MD, Zech AT, Horváth A, Di Mauro V, Koivumäki JT, Kresin N, Busch J, Krause T, Krämer E, Schlossarek S, Spohn M, Friedrich FW, Münch J, Laufer SD, Redwood C, Volk AE, Hansen A, Mearini G, Catalucci D, Meyer C, Christ T, Patten M, Eschenhagen T, Carrier L. Disease modeling of a mutation in α-actinin 2 guides clinical therapy in hypertrophic cardiomyopathy. EMBO Mol Med 2019; 11:e11115. [PMID: 31680489 PMCID: PMC6895603 DOI: 10.15252/emmm.201911115] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 10/08/2019] [Accepted: 10/09/2019] [Indexed: 12/14/2022] Open
Abstract
Hypertrophic cardiomyopathy (HCM) is a cardiac genetic disease accompanied by structural and contractile alterations. We identified a rare c.740C>T (p.T247M) mutation in ACTN2, encoding α-actinin 2 in a HCM patient, who presented with left ventricular hypertrophy, outflow tract obstruction, and atrial fibrillation. We generated patient-derived human-induced pluripotent stem cells (hiPSCs) and show that hiPSC-derived cardiomyocytes and engineered heart tissues recapitulated several hallmarks of HCM, such as hypertrophy, myofibrillar disarray, hypercontractility, impaired relaxation, and higher myofilament Ca2+ sensitivity, and also prolonged action potential duration and enhanced L-type Ca2+ current. The L-type Ca2+ channel blocker diltiazem reduced force amplitude, relaxation, and action potential duration to a greater extent in HCM than in isogenic control. We translated our findings to patient care and showed that diltiazem application ameliorated the prolonged QTc interval in HCM-affected son and sister of the index patient. These data provide evidence for this ACTN2 mutation to be disease-causing in cardiomyocytes, guiding clinical therapy in this HCM family. This study may serve as a proof-of-principle for the use of hiPSC for personalized treatment of cardiomyopathies.
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Affiliation(s)
- Maksymilian Prondzynski
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Marc D Lemoine
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany.,Department of Cardiology-Electrophysiology, University Heart and Vascular Center, Hamburg, Germany
| | - Antonia Tl Zech
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - András Horváth
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Vittoria Di Mauro
- Institute of Genetics and Biomedical Research, Milan Unit, National Research Council, Milan, Italy.,Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Jussi T Koivumäki
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Nico Kresin
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Josefine Busch
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Tobias Krause
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Elisabeth Krämer
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Saskia Schlossarek
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Michael Spohn
- Bioinformatics Core, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Felix W Friedrich
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Julia Münch
- Department of Cardiology-Electrophysiology, University Heart and Vascular Center, Hamburg, Germany.,Department of General and Interventional Cardiology, University Heart and Vascular Center, Hamburg, Germany
| | - Sandra D Laufer
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Charles Redwood
- Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Alexander E Volk
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Arne Hansen
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Giulia Mearini
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Daniele Catalucci
- Institute of Genetics and Biomedical Research, Milan Unit, National Research Council, Milan, Italy.,Humanitas Clinical and Research Center, Rozzano, Milan, Italy
| | - Christian Meyer
- DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany.,Department of Cardiology-Electrophysiology, University Heart and Vascular Center, Hamburg, Germany
| | - Torsten Christ
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Monica Patten
- DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany.,Department of General and Interventional Cardiology, University Heart and Vascular Center, Hamburg, Germany
| | - Thomas Eschenhagen
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
| | - Lucie Carrier
- Institute of Experimental Pharmacology and Toxicology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany
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29
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Liu Y, Cheng H, Tiersch TR. The role of alkalinization-induced Ca2+ influx in sperm motility activation of a viviparous fish Redtail Splitfin (Xenotoca eiseni). Biol Reprod 2019; 99:1159-1170. [PMID: 29982498 DOI: 10.1093/biolre/ioy150] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 06/28/2018] [Indexed: 11/13/2022] Open
Abstract
Mechanisms regulating sperm motility activation are generally known in oviparous fishes, but are poorly understood in viviparous species. The mechanism of osmotic-shock induced signaling for oviparous fishes is not suitable for viviparous fishes which activate sperm motility within an isotonic environment. In addition, the presence of sperm bundles in viviparous fishes further complicates study of sperm activation mechanisms. The goal of this study was to establish methodologies to detect intracellular Ca2+ signals from sperm cells within bundles, and to investigate the signaling mechanism of sperm activation of viviparous fish using Redtail Splitfin (Xenotoca eiseni) as a model. Motility was assessed by classification of bundle dissociation and computer-assisted sperm analysis, and intracellular Ca2+ was assessed using the fluorescent probe Fura-2 AM. Bundle dissociation and sperm motility increased with extracellular Ca2+ and pH levels. Intracellular Ca2+ signals were detected from sperm within bundles, and increased significantly with extracellular Ca2+ and pH levels. Major channel blockers known to inhibit Ca2+ influx (NiCl2, ruthenium red, GdCl3, SKF-96365, nimodipine, verapamil, methoxyverapamil, mibefradil, NNC 55-0396, ω-Conotoxin MVIIC, bepridil, and 2-APB) failed to inhibit Ca2+ influx, except for CdCl2, which partially inhibited the influx. We propose a novel mechanism for motility regulation of fish sperm: an alkaline environment in the female reproductive tract opens Ca2+ channels in the sperm plasma membrane without osmotic shock, and the Ca2+ influx functions as a second messenger to activate motor proteins controlling flagella movement.
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Affiliation(s)
- Yue Liu
- Aquatic Germplasm and Genetic Resources Center, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, USA
| | - Henrique Cheng
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, Louisiana, USA
| | - Terrence R Tiersch
- Aquatic Germplasm and Genetic Resources Center, School of Renewable Natural Resources, Louisiana State University Agricultural Center, Baton Rouge, Louisiana, USA
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30
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Tang L, Gamal El-Din TM, Lenaeus MJ, Zheng N, Catterall WA. Structural Basis for Diltiazem Block of a Voltage-Gated Ca 2+ Channel. Mol Pharmacol 2019; 96:485-492. [PMID: 31391290 DOI: 10.1124/mol.119.117531] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 08/02/2019] [Indexed: 02/05/2023] Open
Abstract
Diltiazem is a widely prescribed Ca2+ antagonist drug for cardiac arrhythmia, hypertension, and angina pectoris. Using the ancestral CaV channel construct CaVAb as a molecular model for X-ray crystallographic analysis, we show here that diltiazem targets the central cavity of the voltage-gated Ca2+ channel underneath its selectivity filter and physically blocks ion conduction. The diltiazem-binding site overlaps with the receptor site for phenylalkylamine Ca2+ antagonist drugs such as verapamil. The dihydropyridine Ca2+ channel blocker amlodipine binds at a distinct site and allosterically modulates the binding sites for diltiazem and Ca2+ Our studies resolve two distinct binding poses for diltiazem in the absence and presence of amlodipine. The binding pose in the presence of amlodipine may mimic a high-affinity binding configuration induced by voltage-dependent inactivation, which is favored by dihydropyridine binding. In this binding pose, the tertiary amino group of diltiazem projects upward into the inner end of the ion selectivity filter, interacts with ion coordination Site 3 formed by the backbone carbonyls of T175, and alters binding of Ca2+ to ion coordination Sites 1 and 2. Altogether, our results define the receptor site for diltiazem and elucidate the mechanisms for pore block and allosteric modulation by other Ca2+ channel-blocking drugs at the atomic level. SIGNIFICANCE STATEMENT: Calcium antagonist drugs that block voltage-gated calcium channels in heart and vascular smooth muscle are widely used in the treatment of cardiovascular diseases. Our results reveal the chemical details of diltiazem binding in a blocking position in the pore of a model calcium channel and show that binding of another calcium antagonist drug alters binding of diltiazem and calcium. This structural information defines the mechanism of drug action at the atomic level and provides a molecular template for future drug discovery.
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Affiliation(s)
- Lin Tang
- Department of Neurology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China (L.T.); and Department of Pharmacology (L.T., T.M.G.E.-D., M.J.L., N.Z., W.A.C.), Division of General Internal Medicine, Department of Medicine (M.J.L.), and Howard Hughes Medical Institute (N.Z.), University of Washington, Seattle, Washington
| | - Tamer M Gamal El-Din
- Department of Neurology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China (L.T.); and Department of Pharmacology (L.T., T.M.G.E.-D., M.J.L., N.Z., W.A.C.), Division of General Internal Medicine, Department of Medicine (M.J.L.), and Howard Hughes Medical Institute (N.Z.), University of Washington, Seattle, Washington
| | - Michael J Lenaeus
- Department of Neurology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China (L.T.); and Department of Pharmacology (L.T., T.M.G.E.-D., M.J.L., N.Z., W.A.C.), Division of General Internal Medicine, Department of Medicine (M.J.L.), and Howard Hughes Medical Institute (N.Z.), University of Washington, Seattle, Washington
| | - Ning Zheng
- Department of Neurology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China (L.T.); and Department of Pharmacology (L.T., T.M.G.E.-D., M.J.L., N.Z., W.A.C.), Division of General Internal Medicine, Department of Medicine (M.J.L.), and Howard Hughes Medical Institute (N.Z.), University of Washington, Seattle, Washington
| | - William A Catterall
- Department of Neurology, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University and Collaborative Innovation Center for Biotherapy, Chengdu, Sichuan, China (L.T.); and Department of Pharmacology (L.T., T.M.G.E.-D., M.J.L., N.Z., W.A.C.), Division of General Internal Medicine, Department of Medicine (M.J.L.), and Howard Hughes Medical Institute (N.Z.), University of Washington, Seattle, Washington
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31
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Obradović D, Jovanović D, Pešić S, Tomić J, Oljačić S, Nikolić K, Agbaba D. Analysis of the retention behavior of selected antiarrhythmics by means of thin-layer chromatography. J LIQ CHROMATOGR R T 2019. [DOI: 10.1080/10826076.2019.1585613] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Darija Obradović
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Dušan Jovanović
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Sunčica Pešić
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Jovana Tomić
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Slavica Oljačić
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Katarina Nikolić
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
| | - Danica Agbaba
- Department of Pharmaceutical Chemistry, University of Belgrade - Faculty of Pharmacy, Belgrade, Serbia
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32
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Xu L, Tang C, Li X, Li X, Yang H, Mao R, He J, Li W, Liu J, Li Y, Shi S, Xiao X, Wang X. Ligand fishing with cellular membrane-coated cellulose filter paper: a new method for screening of potential active compounds from natural products. Anal Bioanal Chem 2019; 411:1989-2000. [PMID: 30798339 DOI: 10.1007/s00216-019-01662-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 01/25/2019] [Accepted: 02/01/2019] [Indexed: 01/24/2023]
Abstract
Ligand fishing is a widely used approach for screening active compounds from natural products. Recently, cell membrane (CM) as affinity ligand has been applied in ligand fishing, including cell membrane chromatography (CMC) and CM-coated magnetic bead. However, these methods possess many weaknesses, including complicated preparation processes and time-consuming operation. In this study, cheap and easily available cellulose filter paper (CFP) was selected as carrier of CM and used to fabricate a novel CM-coated CFP (CMCFP) for the first time. The type of CFP was optimized according to the amount of immobilized protein, and the immobilization of CM onto CFP by the insertion and self-fusion process was verified by confocal imaging. The CMCFP exhibited good selectivity and stability and was used for fishing potentially active compounds from extracts of Angelica dahurica. Three potentially active compounds, including bergapten, pabulenol, and imperatorin, were fished out and identified. The traditional Chinese medicine systems pharmacology database and analysis platform was used to build an active compound-target protein network, and accordingly, the gamma-aminobutyric acid receptor subunit alpha-1 (GABRA1) was deduced as potential target of CM for the active compounds of Angelica dahurica. Molecular docking was performed to evaluate the interaction between active compounds and GABRA1, and bergapten was speculated as a new potentially active compound. Compared with other methods, the fishing assay based on CMCFP was more effective, simpler, and cheaper.
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Affiliation(s)
- Liang Xu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China.,Tianjin Medical College, Tianjin, 300222, China
| | - Cheng Tang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China
| | - Xin Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China
| | - Xiaofan Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China
| | - Huiping Yang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China
| | - Ruizhi Mao
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China.,People's Hospital of Tongliangqu, Chongqing, 402560, China
| | - Jiahui He
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, 61 Yuquan Road, Nankai District, Tianjin, 300193, China.,Acchrom Technologies Co., Lid., Beijing, 100020, China
| | - Wanqing Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China
| | - Jiyang Liu
- Tianjin Medical College, Tianjin, 300222, China
| | - Yalong Li
- Tianjin Medical College, Tianjin, 300222, China
| | - Shuobo Shi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Chaoyang District, Beijing, 100029, China
| | - Xuefeng Xiao
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, 61 Yuquan Road, Nankai District, Tianjin, 300193, China.
| | - Xianhua Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnosis, School of Pharmacy, Tianjin Medical University, 22 Qixiangtai Road, Heping District, Tianjin, 300072, China.
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33
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Calorio C, Gavello D, Guarina L, Salio C, Sassoè-Pognetto M, Riganti C, Bianchi FT, Hofer NT, Tuluc P, Obermair GJ, Defilippi P, Balzac F, Turco E, Bett GC, Rasmusson RL, Carbone E. Impaired chromaffin cell excitability and exocytosis in autistic Timothy syndrome TS2-neo mouse rescued by L-type calcium channel blockers. J Physiol 2019; 597:1705-1733. [PMID: 30629744 DOI: 10.1113/jp277487] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 12/19/2018] [Indexed: 12/30/2022] Open
Abstract
KEY POINTS Tymothy syndrome (TS) is a multisystem disorder featuring cardiac arrhythmias, autism and adrenal gland dysfunction that originates from a de novo point mutation in the gene encoding the Cav1.2 (CACNA1C) L-type channel. To study the role of Cav1.2 channel signals in autism, the autistic TS2-neo mouse has been generated bearing the G406R point-mutation associated with TS type-2. Using heterozygous TS2-neo mice, we report that the G406R mutation reduces the rate of inactivation and shifts leftward the activation and inactivation of L-type channels, causing marked increase of resting Ca2+ influx ('window' Ca2+ current). The increased 'window current' causes marked reduction of NaV channel density, switches normal tonic firing to abnormal burst firing, reduces mitochondrial metabolism, induces cell swelling and decreases catecholamine release. Overnight incubations with nifedipine rescue NaV channel density, normal firing and the quantity of catecholamine released. We provide evidence that chromaffin cell malfunction derives from altered Cav1.2 channel gating. ABSTRACT L-type voltage-gated calcium (Cav1) channels have a key role in long-term synaptic plasticity, sensory transduction, muscle contraction and hormone release. A point mutation in the gene encoding Cav1.2 (CACNA1C) causes Tymothy syndrome (TS), a multisystem disorder featuring cardiac arrhythmias, autism spectrum disorder (ASD) and adrenal gland dysfunction. In the more severe type-2 form (TS2), the missense mutation G406R is on exon 8 coding for the IS6-helix of the Cav1.2 channel. The mutation causes reduced inactivation and induces autism. How this occurs and how Cav1.2 gating-changes alter cell excitability, neuronal firing and hormone release on a molecular basis is still largely unknown. Here, using the TS2-neo mouse model of TS we show that the G406R mutation altered excitability and reduced secretory activity in adrenal chromaffin cells (CCs). Specifically, the TS2 mutation reduced the rate of voltage-dependent inactivation and shifted leftward the activation and steady-state inactivation of L-type channels. This markedly increased the resting 'window' Ca2+ current that caused an increased percentage of CCs undergoing abnormal action potential (AP) burst firing, cell swelling, reduced mitochondrial metabolism and decreased catecholamine release. The increased 'window' Ca2+ current caused also decreased NaV channel density and increased steady-state inactivation, which contributed to the increased abnormal burst firing. Overnight incubation with the L-type channel blocker nifedipine rescued the normal AP firing of CCs, the density of functioning NaV channels and their steady-state inactivation. We provide evidence that CC malfunction derives from the altered Cav1.2 channel gating and that dihydropyridines are potential therapeutics for ASD.
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Affiliation(s)
- Chiara Calorio
- Department of Drug Science, NIS Centre, University of Torino, Torino, Italy
| | - Daniela Gavello
- Department of Drug Science, NIS Centre, University of Torino, Torino, Italy
| | - Laura Guarina
- Department of Drug Science, NIS Centre, University of Torino, Torino, Italy
| | - Chiara Salio
- Department of Veterinary Sciences, University of Torino, Torino, Italy
| | - Marco Sassoè-Pognetto
- Department of Neuroscience Rita Levi Montalcini, University of Torino, Torino, Italy
| | - Chiara Riganti
- Department of Oncology, University of Torino, Torino, Italy
| | | | - Nadja T Hofer
- Department of Pharmacology and Toxicology, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria
| | - Petronel Tuluc
- Department of Pharmacology and Toxicology, Center for Molecular Biosciences, University of Innsbruck, Innsbruck, Austria
| | - Gerald J Obermair
- Department of Physiology & Medical Physics, Medical University of Innsbruck, Innsbruck, Austria
| | - Paola Defilippi
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Fiorella Balzac
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Emilia Turco
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Glenna C Bett
- Department of Physiology & Biophysics, State University of New York, Buffalo, NY, USA
| | - Randall L Rasmusson
- Department of Physiology & Biophysics, State University of New York, Buffalo, NY, USA
| | - Emilio Carbone
- Department of Drug Science, NIS Centre, University of Torino, Torino, Italy
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34
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Chen K, Chen W, Yi X, Chen W, Liu M, Wu H. Sterically hindered N-heterocyclic carbene/palladium(ii) catalyzed Suzuki–Miyaura coupling of nitrobenzenes. Chem Commun (Camb) 2019; 55:9287-9290. [DOI: 10.1039/c9cc04634h] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A palladium-catalyzed Suzuki coupling reaction of nitroarenes has been developed using 5-(2,4,6-triisopropylphenyl)-2,3-imidazolylidene[1,5-a]pyridines as the ligands.
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Affiliation(s)
- Kai Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Wei Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Xiaofei Yi
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Wanzhi Chen
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Miaochang Liu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Wenzhou
- China
| | - Huayue Wu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Wenzhou
- China
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35
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Ochi R, Chettimada S, Kizub I, Gupte SA. Dehydroepiandrosterone inhibits I Ca,L and its window current in voltage-dependent and -independent mechanisms in arterial smooth muscle cells. Am J Physiol Heart Circ Physiol 2018; 315:H1602-H1613. [PMID: 30379558 DOI: 10.1152/ajpheart.00291.2018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Dehydroepiandrosterone (DHEA) is an adrenal steroid hormone, which has the highest serum concentration among steroid hormones with DHEA sulfate (DHEAS). DHEA possesses an inhibitory action on glucose-6-phosphate dehydrogenase (G6PD), the first pentose-phosphate pathway enzyme that reduces NADP+ to NADPH. DHEA induced relaxation of high K+-induced contraction in rat arterial strips, whereas DHEAS barely induced it. We studied the effects of DHEA on L-type Ca2+ current ( ICa,L) of A7r5 arterial smooth muscle cells and compared the mechanism of inhibition with that produced by the 6-aminonicotinamide (6-AN) competitive inhibitor of G6PD. DHEA moderately inhibited ICa,L that was elicited from a holding potential (HP) of -80 mV [voltage-independent inhibition (VIDI)] and accelerated decay of ICa,L during the depolarization pulse [voltage-dependent inhibition (VDI)]. DHEA-induced VDI decreased peak ICa,L at depolarized HPs. By applying repetitive depolarization pulses from multiple HPs, novel HP-dependent steady-state inactivation curves ( f∞-HP) were constructed. DHEA shifted f∞-HP to the left and inhibited the window current, which was recorded at depolarized HPs and obtained as a product of current-voltage relationship and f∞-HP. The IC50 value of ICa,L inhibition was much higher than serum concentration. DHEA-induced VDI was downregulated by the dialysis of guanosine 5'- O-(2-thiodiphosphate), which shifted f∞-voltage to the right before the application of DHEA. 6-AN gradually and irreversibly inhibited ICa,L by VIDI, suggesting that the inhibition of G6PD is involved in DHEA-induced VIDI. In 6-AN-pretreated cells, DHEA induced additional inhibition by increasing VIDI and generating VDI. The inhibition of G6PD underlies DHEA-induced VIDI, and DHEA additionally induces VDI as described for Ca2+ channel blockers. NEW & NOTEWORTHY Dehydroepiandrosterone, the most abundantly released adrenal steroid hormone with dehydroepiandrosterone sulfate, inhibited L-type Ca2+ current and its window current in aortic smooth muscle cells. The IC50 value of inhibition decreased with the depolarization of holding potential to 15 µM at -20 mV. The inhibition occurred in a voltage-dependent manner as described for Ca2+ channel blockers and in a voltage-independent manner because of the inhibition of glucose-6-phosphate dehydrogenase.
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Affiliation(s)
- Rikuo Ochi
- Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama , Mobile, Alabama.,Department of Pharmacology, New York Medical College, Valhalla, New York
| | - Sukrutha Chettimada
- Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama , Mobile, Alabama.,Harvard Medical School , Boston, Massachusetts
| | - Igor Kizub
- Department of Pharmacology, New York Medical College, Valhalla, New York
| | - Sachin A Gupte
- Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama , Mobile, Alabama.,Department of Pharmacology, New York Medical College, Valhalla, New York
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36
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Abstract
This review will first describe the importance of Ca2+ entry for function of excitable cells, and the subsequent discovery of voltage-activated calcium conductances in these cells. This finding was rapidly followed by the identification of multiple subtypes of calcium conductance in different tissues. These were initially termed low- and high-voltage activated currents, but were then further subdivided into L-, N-, PQ-, R- and T-type calcium currents on the basis of differing pharmacology, voltage-dependent and kinetic properties, and single channel conductance. Purification of skeletal muscle calcium channels allowed the molecular identification of the pore-forming and auxiliary α2δ, β and ϒ subunits present in these calcium channel complexes. These advances then led to the cloning of the different subunits, which permitted molecular characterisation, to match the cloned channels with physiological function. Studies with knockout and other mutant mice then allowed further investigation of physiological and pathophysiological roles of calcium channels. In terms of pharmacology, cardiovascular L-type channels are targets for the widely used antihypertensive 1,4-dihydropyridines and other calcium channel blockers, N-type channels are a drug target in pain, and α2δ-1 is the therapeutic target of the gabapentinoid drugs, used in neuropathic pain. Recent structural advances have allowed a deeper understanding of Ca2+ permeation through the channel pore and the structure of both the pore-forming and auxiliary subunits. Voltage-gated calcium channels are subject to multiple pathways of modulation by G-protein and second messenger regulation. Furthermore, their trafficking pathways, subcellular localisation and functional specificity are the subjects of active investigation.
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37
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Affiliation(s)
- Chang Xu
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403-0212
| | - Paul F. Morris
- Department of Biological Sciences, Bowling Green State University, Bowling Green, OH, 43403-0212
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38
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Abstract
Pharmacogenetics is an emerging area of medicine, and more work is needed to fully integrate it into a clinical setting for the benefit of patients. Genetic markers can influence the action of many drugs, including those that prevent and treat cardiovascular conditions. Genotyping is not yet commonplace, but guidelines are being put in place to help practitioners determine the effect a genetic marker may have on certain drugs. With advancements in genetic technology and falling costs, genotyping could be available to all patients via a simple saliva test. This would be a cost-effective way for practitioners to determine the most effective treatment for individuals, reducing "trial and error," adverse effects, and rehospitalization rates and increasing patient compliance. Cardiovascular diseases are the leading causes of death worldwide, so using the most effective medication to treat or prevent them is of utmost importance in reducing incidence and mortality.
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39
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Sagawa H, Hoshino S, Yoshioka K, Ding WG, Omatsu-Kanbe M, Nakagawa M, Maruo Y, Matsuura H. Postnatal developmental changes in the sensitivity of L-type Ca 2+ channel to inhibition by verapamil in a mouse heart model. Pediatr Res 2018; 83:1207-1217. [PMID: 29554082 DOI: 10.1038/pr.2018.46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 01/29/2018] [Indexed: 11/09/2022]
Abstract
BackgroundIn the clinical setting, verapamil is contraindicated in neonates and infants, because of the perceived risk of hypotension or bradyarrhythmia. However, it remains unclear whether there is an age-dependent difference in the sensitivity of cardiac L-type Ca2+ channel current (ICa,L) to inhibition by verapamil.MethodsVentricular myocytes were enzymatically dissociated from the hearts of six different age groups (0, 7, 14, 21, 28 days, and 10-15 weeks) of mice, using a similar Langendorff-perfusion method. Whole-cell patch-clamp technique was applied to examine the sensitivity of ICa,L to inhibition, by three classes of structurally different L-type Ca2+ channel antagonists.ResultsVerapamil, nifedipine, and diltiazem concentration-dependently blocked the ventricular ICa,L in all six age groups. However, although nifedipine and diltiazem blocked ventricular ICa,L with a similar potency in all age groups, verapamil more potently blocked ventricular ICa,L in day 0, day 7, day 14, and day 21 mice, than in day 28, and 10-15-week mice.ConclusionIn a mouse heart model, ventricular ICa,L before the weaning age (~21 days of age) exhibited a higher sensitivity to inhibition by verapamil than that after the weaning age, which may explain one possible mechanism associated with the development of verapamil-induced hypotension in human neonates and infants.
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Affiliation(s)
- Hironori Sagawa
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Shinsuke Hoshino
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Kengo Yoshioka
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Mariko Omatsu-Kanbe
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Masao Nakagawa
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Yoshihiro Maruo
- Department of Pediatrics, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Shiga, Japan
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Saravanaperumal SA, Gibbons SJ, Malysz J, Sha L, Linden DR, Szurszewski JH, Farrugia G. Extracellular Cl - regulates electrical slow waves and setting of smooth muscle membrane potential by interstitial cells of Cajal in mouse jejunum. Exp Physiol 2017; 103:40-57. [PMID: 28971566 DOI: 10.1113/ep086367] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 09/27/2017] [Indexed: 12/12/2022]
Abstract
NEW FINDINGS What is the central question of this study? The aim was to investigate the roles of extracellular chloride in electrical slow waves and resting membrane potential of mouse jejunal smooth muscle by replacing chloride with the impermeant anions gluconate and isethionate. What is the main finding and its importance? The main finding was that in smooth muscle cells, the resting Cl- conductance is low, whereas transmembrane Cl- movement in interstitial cells of Cajal (ICCs) is a major contributor to the shape of electrical slow waves. Furthermore, the data confirm that ICCs set the smooth muscle membrane potential and that altering Cl- homeostasis in ICCs can alter the smooth muscle membrane potential. Intracellular Cl- homeostasis is regulated by anion-permeable channels and transporters and contributes to excitability of many cell types, including smooth muscle and interstitial cells of Cajal (ICCs). Our aims were to investigate the effects on electrical activity in mouse jejunal muscle strips of replacing extracellular Cl- (Cl-o ) with the impermeant anions gluconate and isethionate. On reducing Cl-o , effects were observed on electrical slow waves, with small effects on smooth muscle membrane voltage (Em ). Restoration of Cl- hyperpolarized smooth muscle Em proportional to the change in Cl-o concentration. Replacement of 90% of Cl-o with gluconate reversibly abolished slow waves in five of nine preparations. Slow waves were maintained in isethionate. Gluconate and isethionate substitution had similar concentration-dependent effects on peak amplitude, frequency, width at half peak amplitude, rise time and decay time of residual slow waves. Gluconate reduced free ionized Ca2+ in Krebs solutions to 0.13 mm. In Krebs solutions containing normal Cl- and 0.13 mm free Ca2+ , slow wave frequency was lower, width at half peak amplitude was smaller, and decay time was faster. The transient hyperpolarization following restoration of Cl-o was not observed in W/Wv mice, which lack pacemaker ICCs in the small intestine. We conclude that in smooth muscle cells, the resting Cl- conductance is low, whereas transmembrane Cl- movement in ICCs plays a major role in generation or propagation of slow waves. Furthermore, these data support a role for ICCs in setting smooth muscle Em and that altering Cl- homeostasis in ICCs can alter smooth muscle Em .
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Affiliation(s)
| | - Simon J Gibbons
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - John Malysz
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Lei Sha
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - David R Linden
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Joseph H Szurszewski
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Gianrico Farrugia
- Enteric NeuroScience Program, Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
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The Slo(w) path to identifying the mitochondrial channels responsible for ischemic protection. Biochem J 2017; 474:2067-2094. [PMID: 28600454 DOI: 10.1042/bcj20160623] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/10/2017] [Accepted: 02/13/2017] [Indexed: 12/19/2022]
Abstract
Mitochondria play an important role in tissue ischemia and reperfusion (IR) injury, with energetic failure and the opening of the mitochondrial permeability transition pore being the major causes of IR-induced cell death. Thus, mitochondria are an appropriate focus for strategies to protect against IR injury. Two widely studied paradigms of IR protection, particularly in the field of cardiac IR, are ischemic preconditioning (IPC) and volatile anesthetic preconditioning (APC). While the molecular mechanisms recruited by these protective paradigms are not fully elucidated, a commonality is the involvement of mitochondrial K+ channel opening. In the case of IPC, research has focused on a mitochondrial ATP-sensitive K+ channel (mitoKATP), but, despite recent progress, the molecular identity of this channel remains a subject of contention. In the case of APC, early research suggested the existence of a mitochondrial large-conductance K+ (BK, big conductance of potassium) channel encoded by the Kcnma1 gene, although more recent work has shown that the channel that underlies APC is in fact encoded by Kcnt2 In this review, we discuss both the pharmacologic and genetic evidence for the existence and identity of mitochondrial K+ channels, and the role of these channels both in IR protection and in regulating normal mitochondrial function.
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Godfraind T. Discovery and Development of Calcium Channel Blockers. Front Pharmacol 2017; 8:286. [PMID: 28611661 PMCID: PMC5447095 DOI: 10.3389/fphar.2017.00286] [Citation(s) in RCA: 119] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 05/05/2017] [Indexed: 12/25/2022] Open
Abstract
In the mid 1960s, experimental work on molecules under screening as coronary dilators allowed the discovery of the mechanism of calcium entry blockade by drugs later named calcium channel blockers. This paper summarizes scientific research on these small molecules interacting directly with L-type voltage-operated calcium channels. It also reports on experimental approaches translated into understanding of their therapeutic actions. The importance of calcium in muscle contraction was discovered by Sidney Ringer who reported this fact in 1883. Interest in the intracellular role of calcium arose 60 years later out of Kamada (Japan) and Heibrunn (USA) experiments in the early 1940s. Studies on pharmacology of calcium function were initiated in the mid 1960s and their therapeutic applications globally occurred in the the 1980s. The first part of this report deals with basic pharmacology in the cardiovascular system particularly in isolated arteries. In the section entitled from calcium antagonists to calcium channel blockers, it is recalled that drugs of a series of diphenylpiperazines screened in vivo on coronary bed precontracted by angiotensin were initially named calcium antagonists on the basis of their effect in depolarized arteries contracted by calcium. Studies on arteries contracted by catecholamines showed that the vasorelaxation resulted from blockade of calcium entry. Radiochemical and electrophysiological studies performed with dihydropyridines allowed their cellular targets to be identified with L-type voltage-operated calcium channels. The modulated receptor theory helped the understanding of their variation in affinity dependent on arterial cell membrane potential and promoted the terminology calcium channel blocker (CCB) of which the various chemical families are introduced in the paper. In the section entitled tissue selectivity of CCBs, it is shown that characteristics of the drug, properties of the tissue, and of the stimuli are important factors of their action. The high sensitivity of hypertensive animals is explained by the partial depolarization of their arteries. It is noted that they are arteriolar dilators and that they cannot be simply considered as vasodilators. The second part of this report provides key information about clinical usefulness of CCBs. A section is devoted to the controversy on their safety closed by the Allhat trial (2002). Sections are dedicated to their effect in cardiac ischemia, in cardiac arrhythmias, in atherosclerosis, in hypertension, and its complications. CCBs appear as the most commonly used for the treatment of cardiovascular diseases. As far as hypertension is concerned, globally the prevalence in adults aged 25 years and over was around 40% in 2008. Usefulness of CCBs is discussed on the basis of large clinical trials. At therapeutic dosage, they reduce the elevated blood pressure of hypertensive patients but don't change blood pressure of normotensive subjects, as was observed in animals. Those active on both L- and T-type channels are efficient in nephropathy. Alteration of cognitive function is a complication of hypertension recognized nowadays as eventually leading to dementia. This question is discussed together with the efficacy of CCBs in cognitive pathology. In the section entitled beyond the cardiovascular system, CCBs actions in migraine, neuropathic pain, and subarachnoid hemorrhage are reported. The final conclusions refer to long-term effects discovered in experimental animals that have not yet been clearly reported as being important in human pharmacotherapy.
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Affiliation(s)
- Théophile Godfraind
- Pharmacologie, Faculté de Médecine et de Dentisterie, Université Catholique de LouvainBruxelles, Belgium
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Swinney ZT, Haubrich BA, Xia S, Ramesha C, Gomez SR, Guyett P, Mensa-Wilmot K, Swinney DC. A Four-Point Screening Method for Assessing Molecular Mechanism of Action (MMOA) Identifies Tideglusib as a Time-Dependent Inhibitor of Trypanosoma brucei GSK3β. PLoS Negl Trop Dis 2016; 10:e0004506. [PMID: 26942720 PMCID: PMC4778863 DOI: 10.1371/journal.pntd.0004506] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 02/10/2016] [Indexed: 01/01/2023] Open
Abstract
Background New therapeutics are needed for neglected tropical diseases including Human African trypanosomiasis (HAT), a progressive and fatal disease caused by the protozoan parasites Trypanosoma brucei gambiense and T. b. rhodesiense. There is a need for simple, efficient, cost effective methods to identify new molecules with unique molecular mechanisms of action (MMOAs). The mechanistic features of a binding mode, such as competition with endogenous substrates and time-dependence can affect the observed inhibitory IC50, and differentiate molecules and their therapeutic usefulness. Simple screening methods to determine time-dependence and competition can be used to differentiate compounds with different MMOAs in order to identify new therapeutic opportunities. Methodology/Principal Findings In this work we report a four point screening methodology to evaluate the time-dependence and competition for inhibition of GSK3β protein kinase isolated from T. brucei. Using this method, we identified tideglusib as a time-dependent inhibitor whose mechanism of action is time-dependent, ATP competitive upon initial binding, which transitions to ATP non-competitive with time. The enzyme activity was not recovered following 100-fold dilution of the buffer consistent with an irreversible mechanism of action. This is in contrast to the T. brucei GSK3β inhibitor GW8510, whose inhibition was competitive with ATP, not time-dependent at all measured time points and reversible in dilution experiments. The activity of tideglusib against T. brucei parasites was confirmed by inhibition of parasite proliferation (GI50 of 2.3 μM). Conclusions/Significance Altogether this work demonstrates a straightforward method for determining molecular mechanisms of action and its application for mechanistic differentiation of two potent TbGSK3β inhibitors. The four point MMOA method identified tideglusib as a mechanistically differentiated TbGSK3β inhibitor. Tideglusib was shown to inhibit parasite growth in this work, and has been reported to be well tolerated in one year of dosing in human clinical studies. Consequently, further supportive studies on the potential therapeutic usefulness of tideglusib for HAT are justified. Drug discovery for neglected tropical diseases must use efficient methods due to limited resources. One preferred drug discovery strategy is target-based drug discovery. In this strategy it is assumed that drug action begins with binding of a drug to its target. However, while binding is required, it is not sufficient to describe all the molecular interactions that translate binding to a therapeutically useful response. The contribution of aspects of the molecular mechanism of action (MMOA) such as time-dependence and substrate competition can influence concentration response relationships. To address this, a four point MMOA methodology was developed to evaluate time-dependence and substrate competition. We used this method to evaluate the MMOA for T.brucei GSK3β inhibitors, and observed tideglusib to have a time-dependent, ATP-competitive mechanism that differentiated it from rapidly reversible inhibitors, such as GW8510. Adjusting the enzyme assays to account for these mechanisms showed that GW8510 and tideglusib had similar activities for TbGSK3β. However, this similarity did not translate to cellular activity, where GW-8510 was more active than tideglusib (0.12 μM to 2.3 μM, respectively). These data suggest that factors other than TbGSK3β MMOA differentiate the effect of these molecules against T. brucei.
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Affiliation(s)
- Zachary T. Swinney
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
| | - Brad A. Haubrich
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
| | - Shuangluo Xia
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
| | - Chakk Ramesha
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
| | - Stephen R. Gomez
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
| | - Paul Guyett
- Department of Cellular Biology and Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Kojo Mensa-Wilmot
- Department of Cellular Biology and Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
| | - David C. Swinney
- Institute for Rare and Neglected Diseases Drug Discovery, Mountain View, California, United States of America
- * E-mail:
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Chen YC, Zhu W, Zhong SP, Zheng FC, Gao FF, Zhang YM, Xu H, Zheng YS, Shi GG. Characterization and bioactivity of novel calcium antagonists - N-methoxy-benzyl haloperidol quaternary ammonium salt. Oncotarget 2015; 6:43759-69. [PMID: 26544729 PMCID: PMC4791264 DOI: 10.18632/oncotarget.6086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 10/06/2015] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Calcium antagonists play an important role in clinical practice. However, most of them have serious side effects. We have synthesized a series of novel calcium antagonists, quaternary ammonium salt derivatives of haloperidol with N-p-methoxybenzyl (X1), N-m-methoxybenzyl (X2) and N-o-methoxybenzyl (X3) groups. The objective of this study was to investigate the bioactivity of these novel calcium antagonists, especially the vasodilation activity and cardiac side-effects. The possible working mechanisms of these haloperidol derivatives were also explored. EXPERIMENTAL APPROACH Novel calcium antagonists were synthesized by amination. Compounds were screened for their activity of vasodilation on isolated thoracic aortic ring of rats. Their cardiac side effects were explored. The patch-clamp, confocal laser microscopy and the computer-fitting molecular docking experiments were employed to investigate the possible working mechanisms of these calcium antagonists. RESULTS The novel calcium antagonists, X1, X2 and X3 showed stronger vasodilation effect and less cardiac side effect than that of classical calcium antagonists. They blocked L-type calcium channels with an potent effect order of X1 > X2 > X3. Consistently, X1, X2 and X3 interacted with different regions of Ca2+-CaM-CaV1.2 with an affinity order of X1 > X2 > X3. CONCLUSIONS The new halopedidol derivatives X1, X2 and X3 are novel calcium antagonists with stronger vasodilation effect and less cardiac side effect. They could have wide clinical application.
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Affiliation(s)
- Yi-Cun Chen
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Wei Zhu
- Geneheal Biotechnology Co., Ltd, Guangzhou 510000, Guangdong, China
| | - Shu-Ping Zhong
- Department of Biochemistry and Molecular Biology, Keck School of Medicine, University of Southern California, Los Angeles, California 90033, USA
| | - Fu-Chun Zheng
- Department of Pharmacy, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Fen-Fei Gao
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Yan-Mei Zhang
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Han Xu
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Yan-Shan Zheng
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
| | - Gang-Gang Shi
- Department of Pharmacology, Shantou University Medical College, Shantou 515041, Guangdong, China
- Department of Cardiovascular Diseases, the First Affiliated Hospital, Shantou University Medical College, Shantou 515041, Guangdong, China
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Wang D, Lv D, Chen X, Liu Y, Ding X, Jia D, Chen L, Zhu Z, Cao Y, Chai Y. Activity ranking of synthetic analogs targeting vascular endothelial growth factor receptor 2 by an integrated cell membrane chromatography system. J Sep Sci 2015; 38:4159-65. [DOI: 10.1002/jssc.201500857] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 09/28/2015] [Accepted: 09/29/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Dongyao Wang
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Diya Lv
- Analysis and Measurement Center, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Xiaofei Chen
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Yue Liu
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Xuan Ding
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Dan Jia
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Langdong Chen
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Zhenyu Zhu
- Analysis and Measurement Center, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Yan Cao
- Department of Biochemical Pharmacy, School of Pharmacy; Second Military Medical University; Shanghai China
| | - Yifeng Chai
- Department of Pharmaceutical Analysis, School of Pharmacy; Second Military Medical University; Shanghai China
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Li RWS, Yang C, Shan L, Zhang Z, Wang Y, Kwan Y, Lee SM, Hoi MP, Chan S, Cheung AC, Cheung K, Leung GP. Relaxation effect of a novel Danshensu/tetramethylpyrazine derivative on rat mesenteric arteries. Eur J Pharmacol 2015; 761:153-60. [DOI: 10.1016/j.ejphar.2015.04.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 04/21/2015] [Accepted: 04/22/2015] [Indexed: 12/13/2022]
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Eugenol dilates rat cerebral arteries by inhibiting smooth muscle cell voltage-dependent calcium channels. J Cardiovasc Pharmacol 2015; 64:401-6. [PMID: 24921632 DOI: 10.1097/fjc.0000000000000131] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Plants high in eugenol, a phenylpropanoid compound, are used as folk medicines to alleviate diseases including hypertension. Eugenol has been demonstrated to relax conduit and ear arteries and reduce systemic blood pressure, but mechanisms involved are unclear. Here, we studied eugenol regulation of resistance-size cerebral arteries that control regional brain blood pressure and flow and investigated mechanisms involved. We demonstrate that eugenol dilates arteries constricted by either pressure or membrane depolarization (60 mM K) in a concentration-dependent manner. Experiments performed using patch-clamp electrophysiology demonstrated that eugenol inhibited voltage-dependent calcium (Ca) currents, when using Ba as a charge carrier, in isolated cerebral artery smooth muscle cells. Eugenol inhibition of voltage-dependent Ca currents involved pore block, a hyperpolarizing shift (∼-10 mV) in voltage-dependent inactivation, an increase in the proportion of steady-state inactivating current, and acceleration of inactivation rate. In summary, our data indicate that eugenol dilates cerebral arteries by means of multimodal inhibition of voltage-dependent Ca channels.
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Meta-Analysis of Public Microarray Datasets Reveals Voltage-Gated Calcium Gene Signatures in Clinical Cancer Patients. PLoS One 2015; 10:e0125766. [PMID: 26147197 PMCID: PMC4493072 DOI: 10.1371/journal.pone.0125766] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 03/26/2015] [Indexed: 12/25/2022] Open
Abstract
Voltage-gated calcium channels (VGCCs) are well documented to play roles in cell proliferation, migration, and apoptosis; however, whether VGCCs regulate the onset and progression of cancer is still under investigation. The VGCC family consists of five members, which are L-type, N-type, T-type, R-type and P/Q type. To date, no holistic approach has been used to screen VGCC family genes in different types of cancer. We analyzed the transcript expression of VGCCs in clinical cancer tissue samples by accessing ONCOMINE (www.oncomine.org), a web-based microarray database, to perform a systematic analysis. Every member of the VGCCs was examined across 21 different types of cancer by comparing mRNA expression in cancer to that in normal tissue. A previous study showed that altered expression of mRNA in cancer tissue may play an oncogenic role and promote tumor development; therefore, in the present findings, we focus only on the overexpression of VGCCs in different types of cancer. This bioinformatics analysis revealed that different subtypes of VGCCs (CACNA1C, CACNA1D, CACNA1B, CACNA1G, and CACNA1I) are implicated in the development and progression of diverse types of cancer and show dramatic up-regulation in breast cancer. CACNA1F only showed high expression in testis cancer, whereas CACNA1A, CACNA1C, and CACNA1D were highly expressed in most types of cancer. The current analysis revealed that specific VGCCs likely play essential roles in specific types of cancer. Collectively, we identified several VGCC targets and classified them according to different cancer subtypes for prospective studies on the underlying carcinogenic mechanisms. The present findings suggest that VGCCs are possible targets for prospective investigation in cancer treatment.
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Krüger J, Bohrmann J. Bioelectric patterning during oogenesis: stage-specific distribution of membrane potentials, intracellular pH and ion-transport mechanisms in Drosophila ovarian follicles. BMC DEVELOPMENTAL BIOLOGY 2015; 15:1. [PMID: 25591552 PMCID: PMC4302609 DOI: 10.1186/s12861-015-0051-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 01/05/2015] [Indexed: 01/01/2023]
Abstract
Background Bioelectric phenomena have been found to exert influence on various developmental and regenerative processes. Little is known about their possible functions and the cellular mechanisms by which they might act during Drosophila oogenesis. In developing follicles, characteristic extracellular current patterns and membrane-potential changes in oocyte and nurse cells have been observed that partly depend on the exchange of protons, potassium ions and sodium ions. These bioelectric properties have been supposed to be related to various processes during oogenesis, e. g. pH-regulation, osmoregulation, cell communication, cell migration, cell proliferation, cell death, vitellogenesis and follicle growth. Analysing in detail the spatial distribution and activity of the relevant ion-transport mechanisms is expected to elucidate the roles that bioelectric phenomena play during oogenesis. Results To obtain an overview of bioelectric patterning along the longitudinal and transversal axes of the developing follicle, the spatial distributions of membrane potentials (Vmem), intracellular pH (pHi) and various membrane-channel proteins were studied systematically using fluorescent indicators, fluorescent inhibitors and antisera. During mid-vitellogenic stages 9 to 10B, characteristic, stage-specific Vmem-patterns in the follicle-cell epithelium as well as anteroposterior pHi-gradients in follicle cells and nurse cells were observed. Corresponding distribution patterns of proton pumps (V-ATPases), voltage-dependent L-type Ca2+-channels, amiloride-sensitive Na+-channels and Na+,H+-exchangers (NHE) and gap-junction proteins (innexin 3) were detected. In particular, six morphologically distinguishable follicle-cell types are characterized on the bioelectric level by differences concerning Vmem and pHi as well as specific compositions of ion channels and carriers. Striking similarities between Vmem-patterns and activity patterns of voltage-dependent Ca2+-channels were found, suggesting a mechanism for transducing bioelectric signals into cellular responses. Moreover, gradients of electrical potential and pH were observed within single cells. Conclusions Our data suggest that spatial patterning of Vmem, pHi and specific membrane-channel proteins results in bioelectric signals that are supposed to play important roles during oogenesis, e. g. by influencing spatial coordinates, regulating migration processes or modifying the cytoskeletal organization. Characteristic stage-specific changes of bioelectric activity in specialized cell types are correlated with various developmental processes.
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Affiliation(s)
- Julia Krüger
- RWTH Aachen University, Institut für Biologie II, Abt. Zoologie und Humanbiologie, Worringerweg 3, 52056, Aachen, Germany.
| | - Johannes Bohrmann
- RWTH Aachen University, Institut für Biologie II, Abt. Zoologie und Humanbiologie, Worringerweg 3, 52056, Aachen, Germany.
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