1
|
Elliott ER, Cooper RL. The Effect of Calcium Ions on Resting Membrane Potential. BIOLOGY 2024; 13:750. [PMID: 39336177 PMCID: PMC11428845 DOI: 10.3390/biology13090750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2024] [Revised: 08/29/2024] [Accepted: 09/03/2024] [Indexed: 09/30/2024]
Abstract
Regulating membrane potential is key to cellular function. For many animal cells, resting membrane potential is predominantly driven by a family of K2P (two-pore domain) potassium channels. These channels are commonly referred to as leak channels, as their presence results in the membrane being permeable to K+ ions. These channels, along with various pumps and exchangers, keep the cell resting membrane potential (Rp) relatively close to potassium's equilibrium potential (EK); however, in many cells, the resting membrane potential is more depolarized than the EK due to a small Na+ ion leak. Raising [Ca2+]O (extracellular Ca2+ concentration) can result in hyperpolarization of the membrane potential from the resting state. The mechanism for this hyperpolarization likely lies in the blockage of a Na+ leak channel (NALCN) and/or voltage-gated Na+ channels. The effects may also be connected to calcium-activated potassium channels. Using Drosophila melanogaster, we here illustrate that changing [Ca2+]O from 0.5 to 3 mM hyperpolarizes the muscle. Replacing NaCl with LiCl or choline chloride still led to hyperpolarization when increasing [Ca2+]O. Replacing CaCl2 with BaCl2 results in depolarization. K2P channel overexpression in the larval muscle greatly reduces the effects of [Ca2+]O on cell membrane potential, likely because potential is heavily driven by the EK in these muscles. These experiments provide an understanding of the mechanisms behind neuronal hypo-excitability during hypercalcemia, as well as the effects of altered expression of K2P channels on membrane potential.
Collapse
Affiliation(s)
| | - Robin L Cooper
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA
| |
Collapse
|
2
|
Ben Abu Y, Wolfson I. Short-term plasticity as 'energetic memory' of ion channel components of action potential. ROYAL SOCIETY OPEN SCIENCE 2024; 11:231420. [PMID: 39100146 PMCID: PMC11296076 DOI: 10.1098/rsos.231420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/10/2024] [Accepted: 04/03/2024] [Indexed: 08/06/2024]
Abstract
Information transfer in the nervous system is traditionally understood by the transmission of action potentials along neuronal dendrites, with ion channels in the membrane as the basic unit operator for their creation and propagation. We present here a new model for the multiphysics behaviour of ion channels and the action potential dynamics in nervous and other signal-transmitting systems. This model is based on the long-term suppression of an action potential as a response to mechanical input. While other models focus on electrical aspects of the action potential, an increasing body of experiments highlights its electro-mechanical nature and points in particular towards an alteration of the action potential when subjected to a mechanical input. Here, we propose a new phenomenological framework able to capture the mechanical aspect of ion channel dynamics and the resulting effect on the overall electrophysiology of the membrane. The model is introduced here through a set of coupled differential equations that describe the system while agreeing with the general findings of the experiments that support an electro-mechanical model. It also confirms that transient quasi-static mechanical loads reversibly affect the amplitude and rate of change of neuronal action potentials, which are smaller and slower under indentation loading conditions. Changes after the loading release are also reversible, albeit on a different time scale.
Collapse
Affiliation(s)
- Yuval Ben Abu
- Physics Unit, Sapir Academic College, Sderot, Hof Ashkelon79165, Israel
- Department of Physics, Clarendon Laboratory, University of Oxford, OxfordOX1 3PU, UK
| | - Ira Wolfson
- Department of Physics, International School for Advanced Studies (SISSA), Data Science Excellence Group, Via Bonomea 265, Trieste34136, Italy
| |
Collapse
|
3
|
Wagers ML, Starks A, Nadolski J, Bierbower SM, Altenburg S, Schryer B, Cooper RL. Examining the effect of iron (ferric) on physiological processes: Invertebrate models. Comp Biochem Physiol C Toxicol Pharmacol 2024; 278:109856. [PMID: 38354992 DOI: 10.1016/j.cbpc.2024.109856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/15/2024] [Accepted: 02/04/2024] [Indexed: 02/16/2024]
Abstract
Iron is a common and essential element for maintaining life in bacteria, plants and animals and is found in soil, fresh waters and marine waters; however, over exposure is toxic to organisms. Iron is used in electron transport complexes within mitochondria as well as a co-factor in many essential proteins. It is also established that iron accumulation in the central nervous system in mammals is associated with various neurological disorders. Ample studies have investigated the long-term effects of iron overload in the nervous system. However, its acute effects in nervous tissue and additional organ systems warrant further studies. This study investigates the effects of iron overload on development, behavior, survival, cardiac function, and glutamatergic synaptic transmission in the Drosophila melanogaster. Additionally, physiological responses in crayfish were examined following Fe3+ exposure. Fe3+ reduced neuronal excitability in proprioceptive neurons in a crayfish model. Thus, Fe3+ may block stretch activated channels (SACs) as well as voltage-gated Na+ channels. Exposure also rapidly reduces synaptic transmission but does not block ionotropic glutamatergic receptors, suggesting a blockage of pre-synaptic voltage-gated Ca2+ channels in both crustacean and Drosophila models. The effects are partly reversible with acute exposure, indicating the cells are not rapidly damaged. This study is relevant in demonstrating the effects of Fe3+ on various physiological functions in different organisms in order to further understand the acute and long-term consequences of overload.
Collapse
Affiliation(s)
- Mikaela L Wagers
- Department of Biology, University of Kentucky, Lexington 40506, KY, USA
| | - Ashley Starks
- Department of Biology, University of Kentucky, Lexington 40506, KY, USA
| | - Jeremy Nadolski
- Department of Mathematical and Computational Sciences, Benedictine University, Lisle, IL 60532, USA
| | - Sonya M Bierbower
- Department of Chemistry and Life Science, United States Military Academy, West Point, NY 10996, USA
| | - Sean Altenburg
- Department of Chemistry and Life Science, United States Military Academy, West Point, NY 10996, USA
| | - Blake Schryer
- Department of Chemistry and Life Science, United States Military Academy, West Point, NY 10996, USA
| | - Robin L Cooper
- Department of Biology, University of Kentucky, Lexington 40506, KY, USA.
| |
Collapse
|
4
|
Stumm RE. Carbon dioxide's direct impact on down-regulating the human species. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 905:167198. [PMID: 37734619 DOI: 10.1016/j.scitotenv.2023.167198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 08/30/2023] [Accepted: 09/17/2023] [Indexed: 09/23/2023]
Abstract
Much is said about carbon dioxide (CO2) affecting climate; rising global temperatures, rising sea levels, and stagnating ocean currents being often cited results. Less is said about what CO2 does directly to human physiology should anthropogenic trends not abate. Past mass extinctions have been correlated to airborne CO2 levels rapidly rising above 1000 ppm (Ward, 2007); a value that may be seen by the end of this century. This study proposes as humankind confronts climate changes brought on by rising atmospheric CO2 concentration, as levels rise over 1000 ppm humans may also be inundated by the direct effects of CO2. While this has already been proposed by others, this study goes on to introduce a straight forward model for helping quantify the impact of airborne CO2 on human physiology which shows the onset of hypercapnic bloodstream pH levels in humans begin to appear when atmospheric CO2 levels approach 3000 ppm. However, upon examination of data from past submarine studies, a physiological response may occur in humans at much lower atmospheric CO2 levels due to a slow buildup of CO2 in the body over time. A casual link between atmospheric CO2 levels and the calcium balance in the human body is established providing rationale for the possibility of a greater occurrence of vascular calcification and concurrent bone demineralization in the greater general population when atmospheric CO2 levels rise. Noted is the likelihood of neurological effects at CO2 levels around 1000 ppm is suggested by several past studies. Note is also made of other organisms such as fish having much lower arterial pressures than humans making them more vulnerable to environmental CO2 changes as found by other studies. This study concludes CO2's direct impact to the human physiology as well as other life is not as benign as many like to suggest, and beyond climate change, appears as a mechanism for undermining human sustainability deserving closer scrutiny, and greater discussion.
Collapse
|
5
|
Wang H, Lu Y. High calcium concentrations reduce cellular excitability of mouse MNTB neurons. Brain Res 2023; 1820:148568. [PMID: 37689332 PMCID: PMC10591835 DOI: 10.1016/j.brainres.2023.148568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 09/11/2023]
Abstract
Calcium, a universal intracellular signaling molecule, plays essential roles in neural functions. Historically, in most in vitro brain slice electrophysiology studies, the extracellular calcium concentration ([Ca2+]e) in artificial cerebrospinal fluid is of a wide range and typically higher than the physiological value. At high [Ca2+]e, synaptic transmission is generally enhanced. However, the effects and the underlying mechanisms of calcium on intrinsic neuronal properties are diverse. Using whole-cell patch clamp in acute brainstem slices obtained from mice of either sex, we investigated the effects and the underlying mechanisms of high [Ca2+]e on intrinsic neuronal properties of neurons in the medial nucleus of the trapezoid body (MNTB), an auditory brainstem component in the sound localization circuitry. Compared to the physiological [Ca2+]e (1.2 mM), high [Ca2+]e at 1.8 and 2.4 mM significantly reduced the cellular excitability of MNTB neurons, resulting in decreased spike firing rate, depolarized spike threshold, and decreased the ability to follow high frequency inputs. High extracellular magnesium concentrations at 1.8 and 2.4 mM produced similar but less robust effects, due to surface charge screening. Upon high calcium application, voltage-gated sodium channel currents remained largely unchanged. Calcium-sensing receptors were detected in MNTB neurons, but blocking these receptors did not eliminate the effects of high calcium on spontaneous spiking. We attribute the lack of significant effects in these last two experiments to the moderate changes in calcium we tested. Our results call for the use of physiological [Ca2+]e in brain slice experiments.
Collapse
Affiliation(s)
- Huimei Wang
- Department of Anatomy and Neurobiology, Hearing Research Group, College of Medicine, Northeast Ohio Medical University, Rootstown, OH 44272, USA
| | - Yong Lu
- Department of Anatomy and Neurobiology, Hearing Research Group, College of Medicine, Northeast Ohio Medical University, Rootstown, OH 44272, USA.
| |
Collapse
|
6
|
Sato MT, Hasegawa T, Noma H, Sugita H, Ota E. Efficacy and safety of drug therapy for the prevention and treatment of chemotherapy-induced peripheral neuropathy: a protocol for a systematic review and network meta-analysis. BMJ Open 2023; 13:e070645. [PMID: 37699621 PMCID: PMC10503317 DOI: 10.1136/bmjopen-2022-070645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 08/22/2023] [Indexed: 09/14/2023] Open
Abstract
INTRODUCTION Chemotherapy-induced peripheral neuropathy (CIPN) is one of the most common dose-limiting side effects of chemotherapeutic drugs. Numerous clinical trials of various targeted drugs for the prevention or treatment of CIPN have been conducted; however, previous systematic reviews with direct comparisons have failed to demonstrate the efficacy of these drugs in the prevention or treatment of CIPN. In addition, no systematic reviews have indirectly compared CIPN prevention and treatment. This article describes a protocol for evaluating the efficacy and safety of drug therapy for the prevention and treatment of CIPN. The results of the proposed systematic review with network meta-analysis (NMA) will provide new insights into the prevention and treatment of CIPN. METHODS AND ANALYSIS We will conduct a literature search in MEDLINE, PubMed, Embase, Cochrane Central Register of Controlled Trials and ClinicalTrials.gov to find relevant articles published through January 2023. We will include studies that investigated the efficacy and safety of vitamin B12, goshajinkigan, non-steroidal anti-inflammatory analgesics, opioids, calcium and magnesium, antidepressants and anticonvulsants on CIPN. Two authors will individually screen the retrieved reports and review the full text based on the selection criteria. The primary outcome is the incidence and severity of CIPN. The risk of bias will be assessed using V.2.0 of the Cochrane risk-of-bias tool. We will apply a frequentist random-effects NMA model to pool effect sizes across trials using risk ratios and mean differences with their 95% CIs. Competing interventions will be ranked using the surface under cumulative ranking probabilities. Heterogeneity will be assessed using the heterogeneity variance τ2, Cochran's Q test and I² statistic. ETHICS AND DISSEMINATION This review does not require ethical approval. The research will be published in a peer-reviewed journal. PROSPERO REGISTRATION NUMBER CRD42022371829.
Collapse
Affiliation(s)
- Miki Takenaka Sato
- Department of Clinical Pharmacy, Showa University School of Pharmacy, Shinagawa-ku, Tokyo, Japan
| | - Takeshi Hasegawa
- Showa University Research Administration Center (SURAC), Showa University, Shinagawa-ku, Tokyo, Japan
- Division of Nephrology, Department of Medicine, Showa University School of Medicine, Shinagawa-ku, Tokyo, Japan
| | - Hisashi Noma
- Department of Data Science, The Institute of Statistical Mathematics, Tachikawa, Tokyo, Japan
| | - Hideki Sugita
- Department of Hospital Pharmaceutics, Showa University School of Pharmacy, Shinagawa-ku, Tokyo, Japan
- Department of Pharmacy, Showa University Fujigaoka Hospital, Yokohama, Kanagawa, Japan
| | - Erika Ota
- Global Health Nursing, Graduate School of Nursing Science, St Luke's International University, Chuo-ku, Tokyo, Japan
- Tokyo Foundation for Policy Research, Minato-ku, Tokyo, Japan
| |
Collapse
|
7
|
Rodríguez-Prados M, Berezhnaya E, Castromonte MT, Menezes-Filho SL, Paillard M, Hajnóczky G. MICU1 occludes the mitochondrial calcium uniporter in divalent-free conditions. Proc Natl Acad Sci U S A 2023; 120:e2218999120. [PMID: 37126688 PMCID: PMC10175726 DOI: 10.1073/pnas.2218999120] [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: 11/06/2022] [Accepted: 03/30/2023] [Indexed: 05/03/2023] Open
Abstract
Mitochondrial Ca2+ uptake is mediated by the mitochondrial uniporter complex (mtCU) that includes a tetramer of the pore-forming subunit, MCU, a scaffold protein, EMRE, and the EF-hand regulatory subunit, MICU1 either homodimerized or heterodimerized with MICU2/3. MICU1 has been proposed to regulate Ca2+ uptake via the mtCU by physically occluding the pore and preventing Ca2+ flux at resting cytoplasmic [Ca2+] (free calcium concentration) and to increase Ca2+ flux at high [Ca2+] due to cooperative activation of MICUs EF-hands. However, mtCU and MICU1 functioning when its EF-hands are unoccupied by Ca2+ is poorly studied due to technical limitations. To overcome this barrier, we have studied the mtCU in divalent-free conditions by assessing the Ru265-sensitive Na+ influx using fluorescence-based measurement of mitochondrial matrix [Na+] (free sodium concentration) rise and the ensuing depolarization and swelling. We show an increase in all these measures of Na+ uptake in MICU1KO cells as compared to wild-type (WT) and rescued MICU1KO HEK cells. However, mitochondria in WT cells and MICU1 stable-rescued cells still allowed some Ru265-sensitive Na+ influx that was prevented by MICU1 in excess upon acute overexpression. Thus, MICU1 restricts the cation flux across the mtCU in the absence of Ca2+, but even in cells with high endogenous MICU1 expression such as HEK, some mtCU seem to lack MICU1-dependent gating. We also show rearrangement of the mtCU and altered number of functional channels in MICU1KO and different rescues, and loss of MICU1 during mitoplast preparation, that together might have obscured the pore-blocking function of MICU1 in divalent-free conditions in previous studies.
Collapse
Affiliation(s)
- Macarena Rodríguez-Prados
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| | - Elena Berezhnaya
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| | - Maria Teresa Castromonte
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| | - Sergio L. Menezes-Filho
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| | - Melanie Paillard
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| | - György Hajnóczky
- MitoCare Center, Department of Pathology, Anatomy and Cell Biology, Thomas Jefferson University, Philadelphia, PA19107
| |
Collapse
|
8
|
Sugimoto M, Takagi T, Suzuki R, Konno N, Asama H, Sato Y, Irie H, Okubo Y, Nakamura J, Takasumi M, Hashimoto M, Kato T, Kobashi R, Hikichi T, Ohira H. Drug treatment for chemotherapy-induced peripheral neuropathy in patients with pancreatic cancer. Fukushima J Med Sci 2022; 68:1-10. [PMID: 35197393 PMCID: PMC9071352 DOI: 10.5387/fms.2021-32] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/11/2022] [Indexed: 12/24/2022] Open
Abstract
Pancreatic cancer (PC) is a lethal disease where most tumors are too advanced at diagnosis for resection, leaving chemotherapy as the mainstay of treatment. Although the prognosis of unresectable PC is poor, it has been dramatically improved by new chemotherapy treatments, such as the combination of 5-fluorouracil, oxaliplatin, irinotecan, and leucovorin (FOLFIRINOX) or gemcitabine plus nab-paclitaxel. However, as oxaliplatin and paclitaxel are common neurotoxic drugs, chemotherapy-induced peripheral neuropathy (CIPN) is a common and severe adverse effect of both treatments. As there are no agents recommended in the ASCO guidelines, we review the methods used to treat CIPN caused by PC treatment. The efficacy of duloxetine was observed in a large randomized controlled trial (RCT). In addition, pregabalin was more effective than duloxetine for CIPN in two RCTs. Although duloxetine and pregabalin can be effective for CIPN, they have several side effects. Therefore, the choice between the two drugs should be determined according to effect and tolerability. Mirogabalin is also used in patients with PC and there is hope it will yield positive outcomes when treating CIPN in the future.
Collapse
Affiliation(s)
- Mitsuru Sugimoto
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Tadayuki Takagi
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Rei Suzuki
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Naoki Konno
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Hiroyuki Asama
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Yuki Sato
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Hiroki Irie
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Yoshinori Okubo
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
- Department of Endoscopy, Fukushima Medical University Hospital
| | - Jun Nakamura
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
- Department of Endoscopy, Fukushima Medical University Hospital
| | - Mika Takasumi
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Minami Hashimoto
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
- Department of Endoscopy, Fukushima Medical University Hospital
| | - Tsunetaka Kato
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
- Department of Endoscopy, Fukushima Medical University Hospital
| | - Ryoichiro Kobashi
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| | - Takuto Hikichi
- Department of Endoscopy, Fukushima Medical University Hospital
| | - Hiromasa Ohira
- Department of Gastroenterology, School of Medicine, Fukushima Medical University
| |
Collapse
|
9
|
Choi W, Ro Y, Kim D, Hong L, Kim D. Induction of hypocalcaemia and evaluation of reticuloruminal motility using a three-axis accelerometer. ANIMAL PRODUCTION SCIENCE 2022. [DOI: 10.1071/an21532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
10
|
Potter R, Meade A, Potter S, Cooper RL. Rapid and Direct Action of Lipopolysaccharide (LPS) on Skeletal Muscle of Larval Drosophila. BIOLOGY 2021; 10:1235. [PMID: 34943150 PMCID: PMC8698716 DOI: 10.3390/biology10121235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 11/21/2021] [Accepted: 11/24/2021] [Indexed: 02/02/2023]
Abstract
The endotoxin lipopolysaccharide (LPS) from Gram-negative bacteria exerts a direct and rapid effect on tissues. While most attention is given to the downstream actions of the immune system in response to LPS, this study focuses on the direct actions of LPS on skeletal muscle in Drosophila melanogaster. It was noted in earlier studies that the membrane potential rapidly hyperpolarizes in a dose-dependent manner with exposure to LPS from Pseudomonas aeruginosa and Serratia marcescens. The response is transitory while exposed to LPS, and the effect does not appear to be due to calcium-activated potassium channels, activated nitric oxide synthase (NOS), or the opening of Cl- channels. The purpose of this study was to further investigate the mechanism of the hyperpolarization of the larval Drosophila muscle due to exposure of LPS using several different experimental paradigms. It appears this response is unlikely related to activation of the Na-K pump or Ca2+ influx. The unknown activation of a K+ efflux could be responsible. This will be an important factor to consider in treatments of bacterial septicemia and cellular energy demands.
Collapse
Affiliation(s)
- Rachel Potter
- College of Medicine, University of Kentucky, 800 Rose Street MN 150, Lexington, KY 40506, USA; (R.P.); (S.P.)
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA;
| | - Alexis Meade
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA;
| | - Samuel Potter
- College of Medicine, University of Kentucky, 800 Rose Street MN 150, Lexington, KY 40506, USA; (R.P.); (S.P.)
| | - Robin L. Cooper
- Department of Biology, University of Kentucky, Lexington, KY 40506, USA;
| |
Collapse
|
11
|
Yang Y, Zhao B, Gao X, Sun J, Ye J, Li J, Cao P. Targeting strategies for oxaliplatin-induced peripheral neuropathy: clinical syndrome, molecular basis, and drug development. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2021; 40:331. [PMID: 34686205 PMCID: PMC8532307 DOI: 10.1186/s13046-021-02141-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 10/12/2021] [Indexed: 12/17/2022]
Abstract
Oxaliplatin (OHP)-induced peripheral neurotoxicity (OIPN) is a severe clinical problem and potentially permanent side effect of cancer treatment. For the management of OIPN, accurate diagnosis and understanding of significant risk factors including genetic vulnerability are essential to improve knowledge regarding the prevalence and incidence of OIPN as well as enhance strategies for the prevention and treatment of OIPN. The molecular mechanisms underlying OIPN are complex, with multi-targets and various cells causing neuropathy. Furthermore, mechanisms of OIPN can reinforce each other, and combination therapies may be required for effective management. However, despite intense investigation in preclinical and clinical studies, no preventive therapies have shown significant clinical efficacy, and the established treatment for painful OIPN is limited. Duloxetine is the only agent currently recommended by the American Society of Clinical Oncology. The present article summarizes the most recent advances in the field of studies on OIPN, the overview of the clinical syndrome, molecular basis, therapy development, and outlook of future drug candidates. Importantly, closer links between clinical pain management teams and oncology will advance the effectiveness of OIPN treatment, and the continued close collaboration between preclinical and clinical research will facilitate the development of novel prevention and treatments for OIPN.
Collapse
Affiliation(s)
- Yang Yang
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 100#, Hongshan Road, Nanjing, 210028, Jiangsu, China. .,Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China. .,Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing, 210023, China. .,Yangtze River Pharmaceutical Group, Taizhou, 225321, China.
| | - Bing Zhao
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 100#, Hongshan Road, Nanjing, 210028, Jiangsu, China.,Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Xuejiao Gao
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 100#, Hongshan Road, Nanjing, 210028, Jiangsu, China.,Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Jinbing Sun
- Changshu No.1 People's Hospital Affiliated to Soochow University, Changshu, 215500, China
| | - Juan Ye
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 100#, Hongshan Road, Nanjing, 210028, Jiangsu, China.,Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Jun Li
- Department of Pharmacy, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, 450052, P.R. China
| | - Peng Cao
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, 100#, Hongshan Road, Nanjing, 210028, Jiangsu, China. .,Department of Pharmacology, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China. .,Zhenjiang Hospital of Chinese Traditional and Western Medicine, Zhenjiang, 212002, Jiangsu, China.
| |
Collapse
|
12
|
The Effect of Calcium Ions on Mechanosensation and Neuronal Activity in Proprioceptive Neurons. NEUROSCI 2021. [DOI: 10.3390/neurosci2040026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Proprioception of all animals is important in being able to have coordinated locomotion. Stretch activated ion channels (SACs) transduce the mechanical force into electrical signals in the proprioceptive sensory endings. The types of SACs vary among sensory neurons in animals as defined by pharmacological, physiological and molecular identification. The chordotonal organs within insects and crustaceans offer a unique ability to investigate proprioceptive function. The effects of the extracellular environment on neuronal activity, as well as the function of associated SACs are easily accessible and viable in minimal saline for ease in experimentation. The effect of extracellular [Ca2+] on membrane properties which affect voltage-sensitivity of ion channels, threshold of action potentials and SACs can be readily addressed in the chordotonal organ in crab limbs. It is of interest to understand how low extracellular [Ca2+] enhances neural activity considering the SACs in the sensory endings could possibly be Ca2+ channels and that all neural activity is blocked with Mn2+. It is suggested that axonal excitability might be affected independent from the SAC activity due to potential presence of calcium activated potassium channels (K(Ca)) and the ability of Ca2+ to block voltage gated Na+ channels in the axons. Separating the role of Ca2+ on the function of the SACs and the excitability of the axons in the nerves associated with chordotonal organs is addressed. These experiments may aid in understanding the mechanisms of neuronal hyperexcitability during hypocalcemia within mammals.
Collapse
|
13
|
Zhang Y, Ma S, Ke X, Yi Y, Yu H, Yu D, Li Q, Shang Y, Lu Y, Pei L. The mechanism of Annexin A1 to modulate TRPV1 and nociception in dorsal root ganglion neurons. Cell Biosci 2021; 11:167. [PMID: 34446102 PMCID: PMC8393810 DOI: 10.1186/s13578-021-00679-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 08/15/2021] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Annexin A1 (ANXA1) exerts anti-nociceptive effect through ANXA1 receptor formyl peptide receptor 2 (FPR2/ALX (receptor for lipoxin A4), FPR2) at the dorsal root ganglia (DRG) level. However, the mechanisms remain elucidated. By using radiant heat, hot/cold plate, tail flick, von Frey, and Randall-Selitto tests to detect nociception in intact and chemical (capsaicin, menthol, mustard oil, formalin or CFA) injected AnxA1 conditional knockout (AnxA1-/-) mice, applying calcium imaging and patch clamp recordings in cultured DRG neurons to measure neuronal excitability, conducting immunofluorescence and western blotting to detect the protein levels of TRPV1, FPR2 and its downstream molecules, and performing double immunofluorescence and co-immunoprecipitation to investigate the interaction between Calmodulin (CaM) and TRPV1; we aim to uncover the molecular and cellular mechanisms of ANXA1's role in antinociception. RESULTS AnxA1-/- mice exhibited significant sensitivity to noxious heat (mean ± SD, 6.2 ± 1.0 s vs. 9.9 ± 1.6 s in Hargreaves test; 13.6 ± 1.5 s vs. 19.0 ± 1.9 s in hot plate test; n = 8; P < 0.001), capsaicin (101.0 ± 15.3 vs. 76.2 ± 10.9; n = 8; P < 0.01), formalin (early phase: 169.5 ± 32.8 s vs. 76.0 ± 21.9 s; n = 8; P < 0.05; late phase: 444.6 ± 40.1 s vs. 320.4 ± 33.6 s; n = 8; P < 0.01) and CFA (3.5 ± 0.8 s vs. 5.9 ± 1.4 s; n = 8; P < 0.01). In addition, we found significantly increased capsaicin induced Ca2+ response, TRPV1 currents and neuronal firing in AnxA1 deficient DRG neurons. Furthermore, ANXA1 mimic peptide Ac2-26 robustly increased intracellular Ca2+, inhibited TRPV1 current, activated PLCβ and promoted CaM-TRPV1 interaction. And these effects of Ac2-26 could be attenuated by FPR2 antagonist Boc2. CONCLUSIONS Selective deletion of AnxA1 in DRG neurons enhances TRPV1 sensitivity and deteriorates noxious heat or capsaicin induced nociception, while ANXA1 mimic peptide Ac2-26 desensitizes TRPV1 via FPR2 and the downstream PLCβ-Ca2+-CaM signal. This study may provide possible target for developing new analgesic drugs in inflammatory pain.
Collapse
Affiliation(s)
- Yufen Zhang
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China.,Department of Anesthesiology, School of Medicine, Washington University in Saint Loius, St. Loius, MO, 63110, USA
| | - Sehui Ma
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Xiao Ke
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Yao Yi
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Hongyan Yu
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Dian Yu
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Qiang Li
- Exchange, Development & Service Center for Science & Technology Talents, The Ministry of Science and Technology (Most), Beijing, 100045, China
| | - You Shang
- Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China.,Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Youming Lu
- Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China.,Department of Physiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Lei Pei
- Department of Neurobiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China. .,Collaborative Innovation Center for Brain Science, The Institute for Brain Research (IBR), Huazhong University of Science and Technology, Wuhan, 430030, China. .,Department of Anesthesiology, School of Medicine, Washington University in Saint Loius, St. Loius, MO, 63110, USA.
| |
Collapse
|
14
|
Waissengrin B, Mirelman D, Pelles S, Bukstein F, Blumenthal DT, Wolf I, Geva R. Effect of cannabis on oxaliplatin-induced peripheral neuropathy among oncology patients: a retrospective analysis. Ther Adv Med Oncol 2021; 13:1758835921990203. [PMID: 33613702 PMCID: PMC7876573 DOI: 10.1177/1758835921990203] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/31/2020] [Indexed: 01/04/2023] Open
Abstract
Background: Chemotherapy-induced peripheral neuropathy (CIPN) is a common and dosage-limited oxaliplatin-related toxicity. To date, there are no successful interventions for CIPN prevention or treatment. A therapeutic role for cannabis in diabetic and HIV-related peripheral neuropathy and a protective role in CIPN have been suggested. We examined the effect of cannabis on oncologic patients with CIPN. Methods: Medical records of 768 consecutive patients treated with oxaliplatin and 5-fluorouracil-based combinations at a tertiary medical center from October 2015 to January 2018 were reviewed. Excluded patients were those with pre-existing neuropathy or patients who received fewer than two cycles of oxaliplatin treatment. CIPN grade, oxaliplatin cumulative dose, and neuropathy-free survival were evaluated. The patients were divided based upon the exposure to cannabis: prior to oxaliplatin (cannabis-first), cannabis following the initiation of oxaliplatin treatment (oxaliplatin-first), and no exposure (control). Results: In total, 513 patients met the inclusion criteria, of whom 248 were treated with cannabis and 265 served as controls. The cannabis-first group included 116 (46.7%) patients and the oxaliplatin-first group included 132 (53.3%) patients. Demographic parameters were comparable between groups. There was a significant difference in CIPN grade 2–3 between cannabis-exposed patients and controls (15.3% and 27.9%, respectively, p < 0.001). The protective effect of cannabis was more pronounced among cannabis-first patients compared to oxaliplatin-first patients (75% and 46.2%, respectively, p < 0.001). The median oxaliplatin cumulative doses were higher in the cannabis-first versus the oxaliplatin-first versus the control groups (545 mg/m2, 340 mg/m2, and 425 mg/m2 respectively, p < 0.001). Conclusion: The rate of neuropathy was reduced among patients treated with cannabis and oxaliplatin. This reduction was more significant in patients who received cannabis prior to treatment with oxaliplatin, suggesting a protective effect. A large prospective trial is planned.
Collapse
Affiliation(s)
- Barliz Waissengrin
- Division of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Dan Mirelman
- Division of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Sharon Pelles
- Division of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Felix Bukstein
- Division of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | | | - Ido Wolf
- Division of Oncology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Ravit Geva
- Oncology Division, Tel-Aviv Sourasky Medical Center, 6 Weizmann Street, Tel Aviv, 6423906, Israel
| |
Collapse
|
15
|
Ryczko D, Hanini‐Daoud M, Condamine S, Bréant BJB, Fougère M, Araya R, Kolta A. S100β‐mediated astroglial control of firing and input processing in layer 5 pyramidal neurons of the mouse visual cortex. J Physiol 2020; 599:677-707. [DOI: 10.1113/jp280501] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 11/23/2020] [Indexed: 12/18/2022] Open
Affiliation(s)
- Dimitri Ryczko
- Département de Neurosciences Université de Montréal Montréal QC Canada
- Département de Pharmacologie‐Physiologie Université de Sherbrooke Sherbrooke QC Canada
- Centre de recherche du CHUS Sherbrooke QC Canada
- Institut de Pharmacologie de Sherbrooke Sherbrooke QC Canada
- Centre d'excellence en neurosciences de l'Université de Sherbrooke Sherbrooke QC Canada
| | | | - Steven Condamine
- Département de Neurosciences Université de Montréal Montréal QC Canada
| | | | - Maxime Fougère
- Département de Pharmacologie‐Physiologie Université de Sherbrooke Sherbrooke QC Canada
| | - Roberto Araya
- Département de Neurosciences Université de Montréal Montréal QC Canada
| | - Arlette Kolta
- Département de Neurosciences Université de Montréal Montréal QC Canada
- Faculté de Médecine Dentaire Université de Montréal Montréal QC Canada
| |
Collapse
|
16
|
Lysenin Channels as Sensors for Ions and Molecules. SENSORS 2020; 20:s20216099. [PMID: 33120957 PMCID: PMC7663491 DOI: 10.3390/s20216099] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/19/2020] [Accepted: 10/23/2020] [Indexed: 12/18/2022]
Abstract
Lysenin is a pore-forming protein extracted from the earthworm Eisenia fetida, which inserts large conductance pores in artificial and natural lipid membranes containing sphingomyelin. Its cytolytic and hemolytic activity is rather indicative of a pore-forming toxin; however, lysenin channels present intricate regulatory features manifested as a reduction in conductance upon exposure to multivalent ions. Lysenin pores also present a large unobstructed channel, which enables the translocation of analytes, such as short DNA and peptide molecules, driven by electrochemical gradients. These important features of lysenin channels provide opportunities for using them as sensors for a large variety of applications. In this respect, this literature review is focused on investigations aimed at the potential use of lysenin channels as analytical tools. The described explorations include interactions with multivalent inorganic and organic cations, analyses on the reversibility of such interactions, insights into the regulation mechanisms of lysenin channels, interactions with purines, stochastic sensing of peptides and DNA molecules, and evidence of molecular translocation. Lysenin channels present themselves as versatile sensing platforms that exploit either intrinsic regulatory features or the changes in ionic currents elicited when molecules thread the conducting pathway, which may be further developed into analytical tools of high specificity and sensitivity or exploited for other scientific biotechnological applications.
Collapse
|
17
|
Hanemaaijer NA, Popovic MA, Wilders X, Grasman S, Pavón Arocas O, Kole MH. Ca 2+ entry through Na V channels generates submillisecond axonal Ca 2+ signaling. eLife 2020; 9:54566. [PMID: 32553116 PMCID: PMC7380941 DOI: 10.7554/elife.54566] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 06/12/2020] [Indexed: 12/15/2022] Open
Abstract
Calcium ions (Ca2+) are essential for many cellular signaling mechanisms and enter the cytosol mostly through voltage-gated calcium channels. Here, using high-speed Ca2+ imaging up to 20 kHz in the rat layer five pyramidal neuron axon we found that activity-dependent intracellular calcium concentration ([Ca2+]i) in the axonal initial segment was only partially dependent on voltage-gated calcium channels. Instead, [Ca2+]i changes were sensitive to the specific voltage-gated sodium (NaV) channel blocker tetrodotoxin. Consistent with the conjecture that Ca2+ enters through the NaV channel pore, the optically resolved ICa in the axon initial segment overlapped with the activation kinetics of NaV channels and heterologous expression of NaV1.2 in HEK-293 cells revealed a tetrodotoxin-sensitive [Ca2+]i rise. Finally, computational simulations predicted that axonal [Ca2+]i transients reflect a 0.4% Ca2+ conductivity of NaV channels. The findings indicate that Ca2+ permeation through NaV channels provides a submillisecond rapid entry route in NaV-enriched domains of mammalian axons. Nerve cells communicate using tiny electrical impulses called action potentials. Special proteins termed ion channels produce these electric signals by allowing specific charged particles, or ions, to pass in or out of cells across its membrane. When a nerve cell ‘fires’ an action potential, specific ion channels briefly open to let in a surge of positively charged ions which electrify the cell. Action potentials begin in the same place in each nerve cell, at an area called the axon initial segment. The large number of sodium channels at this site kick-start the influx of positively charged sodium ions ensuring that every action potential starts from the same place. Previous research has shown that, when action potentials begin, the concentration of calcium ions at the axon initial segment also increases, but it was not clear which ion channels were responsible for this entry of calcium. Channels that are selective for calcium ions are the prime candidates for this process. However, research in squid nerve cells gave rise to an unexpected idea by suggesting that sodium channels may not exclusively let in sodium but also allow some calcium ions to pass through. Hanemaaijer, Popovic et al. therefore wanted to test the routes that calcium ions take and see whether the sodium channels in mammalian nerve cells are also permeable to calcium. Experiments using fluorescent dyes to track the concentration of calcium in rat and human nerve cells showed that calcium ions accumulated at the axon initial segment when action potentials fired. Most of this increase in calcium could be stopped by treating the neurons with a toxin that prevents sodium channels from opening. Electrical manipulations of the cells revealed that, in this context, the calcium ions were effectively behaving like sodium ions. Human kidney cells were then engineered to produce the sodium channel protein. This confirmed that calcium and sodium ions were indeed both passing through the same channel. These results shed new light on the relationship between calcium ions and sodium channels within the mammalian nervous system and that this interplay occurs at the axon initial segment of the cell. Genetic mutations that ‘nudge’ sodium channels towards favoring calcium entry are also found in patients with autism spectrum disorders, and so this new finding may contribute to our understanding of these conditions.
Collapse
Affiliation(s)
- Naomi Ak Hanemaaijer
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands.,Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, Netherlands
| | - Marko A Popovic
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Xante Wilders
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Sara Grasman
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Oriol Pavón Arocas
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands
| | - Maarten Hp Kole
- Department of Axonal Signaling, Netherlands Institute for Neuroscience (NIN), Royal Netherlands Academy of Arts and Sciences (KNAW), Amsterdam, Netherlands.,Cell Biology, Neurobiology and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht, Netherlands
| |
Collapse
|
18
|
Thongprayoon C, Cheungpasitporn W, Chewcharat A, Mao MA, Kashani KB. Serum ionised calcium and the risk of acute respiratory failure in hospitalised patients: a single-centre cohort study in the USA. BMJ Open 2020; 10:e034325. [PMID: 32205373 PMCID: PMC7103831 DOI: 10.1136/bmjopen-2019-034325] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES The objective of this study was to evaluate the risk of acute respiratory failure in all hospitalised patients based on admission serum ionised calcium. DESIGN A retrospective cohort study. SETTING A tertiary referral hospital in Rochester, Minnesota, USA. PARTICIPANTS All hospitalised patients who had serum ionised calcium measurement within 24 hours of hospital admission from January 2009 to December 2013. Patients who were mechanically ventilated at admission were excluded. PREDICTORS Admission serum ionised calcium levels was stratified into six groups: ≤4.39, 4.40-4.59, 4.60-4.79, 4.80-4.99, 5.00-5.19 and ≥5.20 mg/dL. PRIMARY OUTCOME MEASURE The primary outcome was the development of acute respiratory failure requiring mechanical ventilation during hospitalisation. Logistic regression analysis was fit to assess the independent risk of acute respiratory failure based on various admission serum ionised calcium, using serum ionised calcium of 5.00-5.19 mg/dL as the reference group. RESULTS Of 25 709 eligible patients, with the mean serum ionised calcium of 4.8±0.4 mg/dL, acute respiratory failure requiring mechanical ventilation occurred in 2563 patients (10%). The incidence of acute respiratory failure was lowest when admission serum ionised calcium was 5.00-5.19 mg/dL, with the progressively increased risk of acute respiratory failure with decreased serum ionised calcium. In multivariate analysis with adjustment for potential confounders, the increased risk of acute respiratory failure requiring mechanical ventilation was significantly associated with admission serum ionised calcium of ≤4.39 (OR 2.52; 95% CI 2.12 to 3.00), 4.40-4.59 (OR 1.76; 95% CI 1.49 to 2.07) and 4.60-4.79 mg/dL (OR 1.48; 95% CI 1.27 to 1.72), compared with serum ionised calcium of 5.00-5.19 mg/dL. The risk of acute respiratory failure was not significantly increased when serum ionised calcium was at least 4.80 mg/dL. CONCLUSION The increased risk of acute respiratory failure requiring mechanical ventilation was observed when admission serum ionised calcium was lower than 4.80 mg/dL in hospitalised patients.
Collapse
Affiliation(s)
- Charat Thongprayoon
- Division of Nephrology and Hypertension, Mayo Clinic Rochester, Rochester, Minnesota, USA
| | - Wisit Cheungpasitporn
- Division of Nephrology, University of Mississippi Medical Center, Jackson, Mississippi, USA
| | - Api Chewcharat
- Division of Nephrology and Hypertension, Mayo Clinic Rochester, Rochester, Minnesota, USA
| | - Michael A Mao
- Division of Nephrology and Hypertension, Mayo Clinic Florida, Jacksonville, Florida, USA
| | - Kianoush B Kashani
- Division of Nephrology and Hypertension, Mayo Clinic Rochester, Rochester, Minnesota, USA
| |
Collapse
|
19
|
Soybaş Z, Şimşek S, Erol FMB, Erdoğan UÇ, Şimşek EN, Şahin B, Marçalı M, Aydoğdu B, Elbüken Ç, Melik R. Real-Time In Vivo Control of Neural Membrane Potential by Electro-Ionic Modulation. iScience 2019; 17:347-358. [PMID: 31326701 PMCID: PMC6651852 DOI: 10.1016/j.isci.2019.06.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 05/11/2019] [Accepted: 06/28/2019] [Indexed: 11/11/2022] Open
Abstract
Theoretically, by controlling neural membrane potential (Vm) in vivo, motion, sensation, and behavior can be controlled. Until now, there was no available technique that can increase or decrease ion concentration in vivo in real time to change neural membrane potential. We introduce a method that we coin electro-ionic modulation (EIM), wherein ionic concentration around a nerve can be controlled in real time and in vivo. We used an interface to regulate the Ca2+ ion concentration around the sciatic nerve of a frog and thus achieved stimulation and blocking with higher resolution and lower current compared with electrical stimulation. As EIM achieves higher controllability of Vm, it has potential to replace conventional methods used for the treatment of neurological disorders and may bring a new perspective to neuromodulation techniques. EIM regulates extracellular ion concentration in vivo in real time EIM stimulates or blocks the nerve via Ca2+ ion depletion or enhancement EIM achieves selective stimulation or blocking of large or small axons EIM is the most superior neuromodulation method for real-life applications
Collapse
Affiliation(s)
- Zafer Soybaş
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey
| | - Sefa Şimşek
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey
| | - F M Betül Erol
- Faculty of Medicine, Hacettepe University, Ankara 06100, Turkey
| | - U Çiya Erdoğan
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey
| | - Esra N Şimşek
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey
| | - Büşra Şahin
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey
| | - Merve Marçalı
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Bahattin Aydoğdu
- Department of Pediatric Surgery, Dicle University Medical Faculty, Diyarbakır 21280, Turkey
| | - Çağlar Elbüken
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara 06800, Turkey
| | - Rohat Melik
- Department of Electrical and Electronics Engineering, TOBB University of Economics & Technology, Ankara 06510, Turkey.
| |
Collapse
|
20
|
Emini-Sadiku M, Morina-Kuqi N. Concealing Clothing Leading to Severe Vitamin D Deficiency, Osteomalacia and Muscle Weakness. Open Access Maced J Med Sci 2019; 7:2146-2149. [PMID: 31456842 PMCID: PMC6698119 DOI: 10.3889/oamjms.2019.584] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 06/27/2019] [Accepted: 06/28/2019] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND: Vitamin D deficiency is the most common nutritional deficiency worldwide in all ages. Prolonged and severe vitamin D deficiency can result in secondary hyperparathyroidism and osteomalacia. Vitamin D deficiency can be caused by various factors included here institutionalisation, malabsorption, inadequate exposure to sunlight etc. Osteomalacia is a disorder of decreased mineralisation of newly formed osteoid at sited of bone turnover, which can be manifested with symptoms such as diffuse body aches and pain. Muscles weakness from vitamin D deficiency causes difficulty in walking, developing proximal myopathy. Nearly 30-50% of all age groups are Vitamin D deficient worldwide. CASE PRESENTATION: We report a case of 51-years-old woman, with a religious garment, with slowly progressing weakness of the proximal limb muscles, extreme fatigue, chest and lower spine pain, paresthesia, depression, difficulties in walking and waddling gait. On whole-body bone scintigraphy diffuse metabolic changes were present, and in DXA osteoporosis was shown due to severe vitamin D deficiency and secondary hyperparathyroidism. Treatment with high doses of vitamin D and calcium replacement improved clinical manifestation of osteomalacia for few months. Absent of waddling gait with no pain was evident due to the better muscle and bone performance after the treatment. CONCLUSION: Suspicious cases for osteomalacia in population wearing a religious garment and those that are not adequately exposed to the sunlight, laboratory evaluation should include measurement of 25 (OH) vitamin D, PTH, calcium, alkaline phosphatase and performing of DXA in order such cases do not get undiagnosed.
Collapse
Affiliation(s)
- Merita Emini-Sadiku
- Clinic of Endocrinology, University Clinical Centre of Kosovo, Prishtina, Kosovo.,Medical Faculty, University of Prishtina, Prishtina, Kosovo
| | - Nadije Morina-Kuqi
- Clinic of Endocrinology, University Clinical Centre of Kosovo, Prishtina, Kosovo
| |
Collapse
|
21
|
Hu LY, Mi WL, Wu GC, Wang YQ, Mao-Ying QL. Prevention and Treatment for Chemotherapy-Induced Peripheral Neuropathy: Therapies Based on CIPN Mechanisms. Curr Neuropharmacol 2019; 17:184-196. [PMID: 28925884 PMCID: PMC6343206 DOI: 10.2174/1570159x15666170915143217] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 08/20/2017] [Accepted: 01/01/1970] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND Chemotherapy-induced peripheral neuropathy (CIPN) is a progressive, enduring, and often irreversible adverse effect of many antineoplastic agents, among which sensory abnormities are common and the most suffering issues. The pathogenesis of CIPN has not been completely understood, and strategies for CIPN prevention and treatment are still open problems for medicine. OBJECTIVES The objective of this paper is to review the mechanism-based therapies against sensory abnormities in CIPN. METHODS This is a literature review to describe the uncovered mechanisms underlying CIPN and to provide a summary of mechanism-based therapies for CIPN based on the evidence from both animal and clinical studies. RESULTS An abundance of compounds has been developed to prevent or treat CIPN by blocking ion channels, targeting inflammatory cytokines and combating oxidative stress. Agents such as glutathione, mangafodipir and duloxetine are expected to be effective for CIPN intervention, while Ca/Mg infusion and venlafaxine, tricyclic antidepressants, and gabapentin display limited efficacy for preventing and alleviating CIPN. And the utilization of erythropoietin, menthol and amifostine needs to be cautious regarding to their side effects. CONCLUSIONS Multiple drugs have been used and studied for decades, their effect against CIPN are still controversial according to different antineoplastic agents due to the diverse manifestations among different antineoplastic agents and complex drug-drug interactions. In addition, novel therapies or drugs that have proven to be effective in animals require further investigation, and it will take time to confirm their efficacy and safety.
Collapse
Affiliation(s)
- Lang-Yue Hu
- Department of Integrative Medicine and Neurobiology, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture Research, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, School of Basic Medical Science, Fudan University, Shanghai, China
| | - Wen-Li Mi
- Department of Integrative Medicine and Neurobiology, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture Research, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, School of Basic Medical Science, Fudan University, Shanghai, China
| | - Gen-Cheng Wu
- Department of Integrative Medicine and Neurobiology, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture Research, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, School of Basic Medical Science, Fudan University, Shanghai, China
| | - Yan-Qing Wang
- Department of Integrative Medicine and Neurobiology, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture Research, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, School of Basic Medical Science, Fudan University, Shanghai, China
| | - Qi-Liang Mao-Ying
- Department of Integrative Medicine and Neurobiology, State Key Laboratory of Medical Neurobiology, Institute of Acupuncture Research, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, School of Basic Medical Science, Fudan University, Shanghai, China
| |
Collapse
|
22
|
Forsberg M, Seth H, Björefeldt A, Lyckenvik T, Andersson M, Wasling P, Zetterberg H, Hanse E. Ionized calcium in human cerebrospinal fluid and its influence on intrinsic and synaptic excitability of hippocampal pyramidal neurons in the rat. J Neurochem 2019; 149:452-470. [PMID: 30851210 DOI: 10.1111/jnc.14693] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/21/2019] [Accepted: 03/05/2019] [Indexed: 12/13/2022]
Abstract
It is well-known that the extracellular concentration of calcium affects neuronal excitability and synaptic transmission. Less is known about the physiological concentration of extracellular calcium in the brain. In electrophysiological brain slice experiments, the artificial cerebrospinal fluid traditionally contains relatively high concentrations of calcium (2-4 mM) to support synaptic transmission and suppress neuronal excitability. Using an ion-selective electrode, we determined the fraction of ionized calcium in healthy human cerebrospinal fluid to 1.0 mM of a total concentration of 1.2 mM (86%). Using patch-clamp and extracellular recordings in the CA1 region in acute slices of rat hippocampus, we then compared the effects of this physiological concentration of calcium with the commonly used 2 mM on neuronal excitability, synaptic transmission, and long-term potentiation (LTP) to examine the magnitude of changes in this range of extracellular calcium. Increasing the total extracellular calcium concentration from 1.2 to 2 mM decreased spontaneous action potential firing, induced a depolarization of the threshold, and increased the rate of both de- and repolarization of the action potential. Evoked synaptic transmission was approximately doubled, with a balanced effect between inhibition and excitation. In 1.2 mM calcium high-frequency stimulation did not result in any LTP, whereas a prominent LTP was observed at 2 or 4 mM calcium. Surprisingly, this inability to induce LTP persisted during blockade of GABAergic inhibition. In conclusion, an increase from the physiological 1.2 mM to 2 mM calcium in the artificial cerebrospinal fluid has striking effects on neuronal excitability, synaptic transmission, and the induction of LTP. OPEN SCIENCE BADGES: This article has received a badge for *Open Materials* because it provided all relevant information to reproduce the study in the manuscript. The complete Open Science Disclosure form for this article can be found at the end of the article. More information about the Open Practices badges can be found at https://cos.io/our-services/open-science-badges/. Read the Editorial Highlight for this article on page 435.
Collapse
Affiliation(s)
- My Forsberg
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Henrik Seth
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Andreas Björefeldt
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Department of Neuroscience, Brown University, Providence, RI, USA
| | - Tim Lyckenvik
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mats Andersson
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Pontus Wasling
- Department of Clinical Neuroscience, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden.,Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden.,UCL Institute of Neurology, Queen Square, London, UK.,The Dementia Research Institute at UCL, London, UK
| | - Eric Hanse
- Department of Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| |
Collapse
|
23
|
Ventricular Arrhythmia Precipitated by Severe Hypocalcaemia Secondary to Primary Hypoparathyroidism. Case Rep Cardiol 2019; 2019:4851073. [PMID: 31089428 PMCID: PMC6476131 DOI: 10.1155/2019/4851073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 03/05/2019] [Indexed: 11/17/2022] Open
Abstract
Hypocalcaemia causes neuromuscular and myocardial symptoms, including QT interval prolongation, and cardiac arrhythmias. Prompt detection and calcium replacement may reverse the pathology, following which the underlying cause should be diagnosed and treated to prevent recurrence. I present the case of a young man presenting with collapse who was found to have sinus rhythm with significant QT interval prolongation on admission electrocardiogram (ECG) associated with profound hypocalcaemia secondary to primary hypoparathyroidism.
Collapse
|
24
|
Hamed SA. Neurologic conditions and disorders of uremic syndrome of chronic kidney disease: presentations, causes, and treatment strategies. Expert Rev Clin Pharmacol 2019; 12:61-90. [PMID: 30501441 DOI: 10.1080/17512433.2019.1555468] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Sherifa A. Hamed
- Department of Neurology and Psychiatry, Assiut University Hospital, Assiut, Egypt
| |
Collapse
|
25
|
Activation of KCNQ Channels Prevents Paclitaxel-Induced Peripheral Neuropathy and Associated Neuropathic Pain. THE JOURNAL OF PAIN 2018; 20:528-539. [PMID: 30471428 DOI: 10.1016/j.jpain.2018.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/11/2018] [Accepted: 11/05/2018] [Indexed: 12/29/2022]
Abstract
Paclitaxel-induced peripheral neuropathy (PIPN) and associated neuropathic pain are the most common and serious adverse effects experienced by cancer patients receiving paclitaxel treatment. These effects adversely impact daily activities and consequently the quality of life, sometimes forcing the suspension of treatment and negatively influencing survival. Patients are usually at high risk of developing PIPN if paclitaxel induces acute pain, which strongly suggests that an acute increase in the excitability of nociceptors underlies the chronic alterations of PIPN. KCNQ/Kv7 channels are widely expressed in the primary sensory neurons to modulate their excitability. In the present study, we show that targeting KCNQ/Kv7 channels at an early stage is an effective strategy to attenuate the development of PIPN. We found that paclitaxel did not decrease the expression level of KCNQ/Kv7 channels in the primary sensory neurons as detected by quantitative reverse-transcription polymerase chain reaction (qRT-PCR) and Western blotting. However, retigabine, which is a specific KCNQ/Kv7 channel opener, attenuated significantly the development of PIPN, as shown by both morphologic and behavioral evidence. We also observed that retigabine had no obvious effect on the chemosensitivity of breast cancer cells to paclitaxel. Although retigabine has been approved by the FDA as an anticonvulsant, our study suggests that this drug can be repurposed to attenuate the development of PIPN. PERSPECTIVE: Paclitaxel-induced peripheral neuropathy and associated neuropathic pain are severe and resistant to intervention. The results of our study demonstrated that retigabine (a clinically available medicine) can be used to attenuate the development of paclitaxel-induced peripheral neuropathy.
Collapse
|
26
|
Wang Z, Cui S, Qiu S, Pu S. A highly selective fluorescence "turn-on" sensor for Ca 2+ based on diarylethene with a triazozoyl hydrazine unit. RSC Adv 2018; 8:29295-29300. [PMID: 35548020 PMCID: PMC9084557 DOI: 10.1039/c8ra06039h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 08/10/2018] [Indexed: 12/26/2022] Open
Abstract
A new photochromic diarylethene derivative with a triazozoyl hydrazine unit has been designed and synthesized. Its photochromism and photoswitchable fluorescence behaviors were studied systematically by the stimuli of lights and chemical substances in acetonitrile solution. With the addition of Ca2+, the emission intensity enhanced 6.7 fold, accompanied by an obvious fluorescent color change from dark to light blue. The complexation between the derivative and Ca2+ is reversible with the 1 : 1 stoichiometry, which was verified by Job's plot and MS. The limit of detection (LOD) for Ca2+ was determined to be 2.49 × 10-8 mol L-1. Based on this unimolecular platform, a logic circuit was designed with fluorescence intensity at 482 nm as the output and the combined stimuli of UV/vis and Ca2+/EDTA as four inputs.
Collapse
Affiliation(s)
- Zhen Wang
- Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013 PR China +86-791-83831996 +86-791-83831996
| | - Shiqiang Cui
- Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013 PR China +86-791-83831996 +86-791-83831996
| | - Shouyu Qiu
- Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013 PR China +86-791-83831996 +86-791-83831996
| | - Shouzhi Pu
- Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013 PR China +86-791-83831996 +86-791-83831996
| |
Collapse
|
27
|
Stockman AC, Dieltiëns M, Janssens H, Van Lammeren M, Beelen L, Van Bellinghen V, Cassiman C. Ocular Neuromyotonia: Case Reports and Literature Review. Strabismus 2018; 26:133-141. [DOI: 10.1080/09273972.2018.1467469] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
28
|
Hanna AE, Sanjad S, Andary R, Nemer G, Ghafari JG. Tooth Development Associated with Mutations in Hereditary Vitamin D-Resistant Rickets. JDR Clin Trans Res 2018; 3:28-34. [PMID: 30938651 DOI: 10.1177/2380084417732510] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Hereditary vitamin D-resistant rickets (HVDRR) is a rare genetic disorder caused by mutations at the level of the vitamin D receptor ( VDR) gene. The disease is characterized by refractory hypocalcemia, elevated serum levels of 1,25-dihydroxy-vitamin D, retarded growth, sparse body hair (sometimes alopecia), premature tooth loss, enlarged pulp chambers, thin dentine, and hypoplastic enamel. The aims of this study were 1) to document the dental development of children with HVDRR in association with the mutation type within the VDR and 2) to evaluate the association between dental development and the timing of and response to HVDRR treatment. Genome analysis was performed for 4 affected children (2 y 2 mo to 6 y 8 mo) under treatment with high doses of vitamin D and calcium. Longitudinal records of clinical and radiographic data on their dental development were assessed in relation to genetic profile and response to treatment. Treatment success depended on the position of the mutation within the VDR protein: children with the p.R391S mutation had a favorable outcome but maintained alopecia totalis, while 1 child with the p.H397P mutation and normal hair had no response to very high doses of vitamin D. The primary incisors, formed prenatally and first to emerge, were missing in 3 children and mobile in 1 child; parents reported loss within months posteruption. Posterior teeth were present, having erupted after treatment initiation. Hypoplastic enamel in emerging teeth was associated with late treatment onset. Mutation type in the VDR gene appears to be related to differences in the disease phenotype and response to treatment. Dental development represents an indicator of the disease process, initially protected by maternal blood levels of calcium and later restored by therapeutic supplies that normalize these levels. Knowledge Transfer Statement: Two novel mutations were associated with different HVDRR phenotypes, one of which responded positively to treatment. Early detection of the mutation should help pediatricians forecast treatment protocol and response. The results also highlight the direct relationship between dental development and blood calcium levels, underscoring the importance of early diagnosis and treatment of HVDRR to minimize the loss of primary teeth and reduce structural abnormalities of permanent teeth.
Collapse
Affiliation(s)
- A E Hanna
- 1 Division of Orthodontics and Dentofacial Orthopedics, Department of Otolaryngology and Head and Neck Surgery, American University of Beirut Medical Center, Beirut, Lebanon
| | - S Sanjad
- 2 Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - R Andary
- 3 Private practice, Aley Mount, Lebanon
| | - G Nemer
- 4 Department of Biochemistry and Molecular Genetics, American University of Beirut Medical Center, Beirut, Lebanon
| | - J G Ghafari
- 1 Division of Orthodontics and Dentofacial Orthopedics, Department of Otolaryngology and Head and Neck Surgery, American University of Beirut Medical Center, Beirut, Lebanon
- 5 School of Dentistry, Lebanese University, Beirut, Lebanon
- 6 Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| |
Collapse
|
29
|
Abstract
Armstrong and Hollingworth discuss inactivation in the light of modern structural data from K and Na channels. We are wired with conducting cables called axons that rapidly transmit electrical signals (e.g., “Ouch!”) from, for example, the toe to the spinal cord. Because of the high internal resistance of axons (salt water rather than copper), a signal must be reinforced after traveling a short distance. Reinforcement is accomplished by ion channels, Na channels for detecting the signal and reinforcing it by driving it further positive (to near 50 mV) and K channels for then restoring it to the resting level (near −70 mV). The signal is called an action potential and has a duration of roughly a millisecond. The return of membrane voltage (Vm) to the resting level after an action potential is facilitated by “inactivation” of the Na channels: i.e., an internal particle diffuses into the mouth of any open Na channel and temporarily blocks it. Some types of K channels also show inactivation after being open for a time. N-type inactivation of K channels has a relatively fast time course and involves diffusion of the N-terminal of one of the channel’s four identical subunits into the channel’s inner mouth, if it is open. This mechanism is similar to Na channel inactivation. Both Na and K channels also display slower inactivation processes. C inactivation in K channels involves changes in the channel’s outer mouth, the “selectivity filter,” whose normal function is to prevent Na+ ions from entering the K channel. C inactivation deforms the filter so that neither K+ nor Na+ can pass.
Collapse
Affiliation(s)
- Clay M Armstrong
- Department of Physiology, University of Pennsylvania, Philadelphia, PA
| | | |
Collapse
|
30
|
Kourghi M, Nourmohammadi S, Pei JV, Qiu J, McGaughey S, Tyerman SD, Byrt CS, Yool AJ. Divalent Cations Regulate the Ion Conductance Properties of Diverse Classes of Aquaporins. Int J Mol Sci 2017; 18:ijms18112323. [PMID: 29099773 PMCID: PMC5713292 DOI: 10.3390/ijms18112323] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 10/27/2017] [Accepted: 10/28/2017] [Indexed: 12/20/2022] Open
Abstract
Aquaporins (AQPs) are known to facilitate water and solute fluxes across barrier membranes. An increasing number of AQPs are being found to serve as ion channels. Ion and water permeability of selected plant and animal AQPs (plant Arabidopsis thaliana AtPIP2;1, AtPIP2;2, AtPIP2;7, human Homo sapiens HsAQP1, rat Rattus norvegicus RnAQP4, RnAQP5, and fly Drosophilamelanogaster DmBIB) were expressed in Xenopus oocytes and examined in chelator-buffered salines to evaluate the effects of divalent cations (Ca2+, Mg2+, Ba2+ and Cd2+) on ionic conductances. AtPIP2;1, AtPIP2;2, HsAQP1 and DmBIB expressing oocytes had ionic conductances, and showed differential sensitivity to block by external Ca2+. The order of potency of inhibition by Ca2+ was AtPIP2;2 > AtPIP2;1 > DmBIB > HsAQP1. Blockage of the AQP cation channels by Ba2+ and Cd2+ caused voltage-sensitive outward rectification. The channels with the highest sensitivity to Ca2+ (AtPIP2;1 and AtPIP2;2) showed a distinctive relief of the Ca2+ block by co-application of excess Ba2+, suggesting that divalent ions act at the same site. Recognizing the regulatory role of divalent cations may enable the discovery of other classes of AQP ion channels, and facilitate the development of tools for modulating AQP ion channels. Modulators of AQPs have potential value for diverse applications including improving salinity tolerance in plants, controlling vector-borne diseases, and intervening in serious clinical conditions involving AQPs, such as cancer metastasis, cardiovascular or renal dysfunction.
Collapse
Affiliation(s)
- Mohamad Kourghi
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Saeed Nourmohammadi
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Jinxin V Pei
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Jiaen Qiu
- School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Samantha McGaughey
- School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Stephen D Tyerman
- School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Caitlin S Byrt
- School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia.
| | - Andrea J Yool
- Adelaide Medical School, University of Adelaide, Adelaide, SA 5005, Australia.
| |
Collapse
|
31
|
Diez R, Richardson MJE, Wall MJ. Reducing Extracellular Ca 2+ Induces Adenosine Release via Equilibrative Nucleoside Transporters to Provide Negative Feedback Control of Activity in the Hippocampus. Front Neural Circuits 2017; 11:75. [PMID: 29066955 PMCID: PMC5641293 DOI: 10.3389/fncir.2017.00075] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/27/2017] [Indexed: 12/04/2022] Open
Abstract
Neural circuit activity increases the release of the purine neuromodulator adenosine into the extracellular space leading to A1 receptor activation and negative feedback via membrane hyperpolarization and inhibition of transmitter release. Adenosine can be released by a number of different mechanisms that include Ca2+ dependent processes such as the exocytosis of ATP. During sustained pathological network activity, ischemia and hypoxia the extracellular concentration of calcium ions (Ca2+) markedly falls, inhibiting exocytosis and potentially reducing adenosine release. However it has been observed that reducing extracellular Ca2+ can induce paradoxical neural activity and can also increase adenosine release. Here we have investigated adenosine signaling and release mechanisms that occur when extracellular Ca2+ is removed. Using electrophysiology and microelectrode biosensor measurements we have found that adenosine is directly released into the extracellular space by the removal of extracellular Ca2+ and controls the induced neural activity via A1 receptor-mediated membrane potential hyperpolarization. Following Ca2+ removal, adenosine is released via equilibrative nucleoside transporters (ENTs), which when blocked leads to hyper-excitation. We propose that sustained action potential firing following Ca2+ removal leads to hydrolysis of ATP and a build-up of intracellular adenosine which then effluxes into the extracellular space via ENTs.
Collapse
Affiliation(s)
- Rebecca Diez
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | | | - Mark J Wall
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
| |
Collapse
|
32
|
Zhekova HR, Ngo V, da Silva MC, Salahub D, Noskov S. Selective ion binding and transport by membrane proteins – A computational perspective. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
33
|
Starobova H, Vetter I. Pathophysiology of Chemotherapy-Induced Peripheral Neuropathy. Front Mol Neurosci 2017; 10:174. [PMID: 28620280 PMCID: PMC5450696 DOI: 10.3389/fnmol.2017.00174] [Citation(s) in RCA: 363] [Impact Index Per Article: 51.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 05/17/2017] [Indexed: 12/11/2022] Open
Abstract
Chemotherapy-induced neuropathy is a common, dose-dependent adverse effect of several antineoplastics. It can lead to detrimental dose reductions and discontinuation of treatment, and severely affects the quality of life of cancer survivors. Clinically, chemotherapy-induced peripheral neuropathy presents as deficits in sensory, motor, and autonomic function which develop in a glove and stocking distribution due to preferential effects on longer axons. The pathophysiological processes are multi-factorial and involve oxidative stress, apoptotic mechanisms, altered calcium homeostasis, axon degeneration and membrane remodeling as well as immune processes and neuroinflammation. This review focusses on the commonly used antineoplastic substances oxaliplatin, cisplatin, vincristine, docetaxel, and paclitaxel which interfere with the cancer cell cycle-leading to cell death and tumor degradation-and cause severe acute and chronic peripheral neuropathies. We discuss drug mechanism of action and pharmacokinetic disposition relevant to the development of peripheral neuropathy, the epidemiology and clinical presentation of chemotherapy-induced neuropathy, emerging insight into genetic susceptibilities as well as current understanding of the pathophysiology and treatment approaches.
Collapse
Affiliation(s)
- Hana Starobova
- Centre for Pain Research, Institute for Molecular Bioscience, University of QueenslandSt Lucia, QLD, Australia
| | - Irina Vetter
- Centre for Pain Research, Institute for Molecular Bioscience, University of QueenslandSt Lucia, QLD, Australia.,School of Pharmacy, University of QueenslandSt Lucia, QLD, Australia
| |
Collapse
|
34
|
Hajjar K, Hagenacker T. Neuromuscular Disorder as Initial Manifestation of Secondary Hyperparathyroidism - A Case Report. Eur J Transl Myol 2017; 27:6100. [PMID: 28458803 PMCID: PMC5391528 DOI: 10.4081/ejtm.2017.6100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
This case report describes a young woman who presented with slowly progressing weakness of the proximal limb muscles and slight decrease of muscle tone but otherwise unremarkable neurological history. Diagnostic workup revealed fatty degeneration of the girdle muscles and an excessive increase of the parathyroid hormone as a result of severe vitamin D deficiency. Secondary hyperparathyroidism was diagnosed, and neurological deficits resolved after treatment of the underlying endocrinopathy.
Collapse
Affiliation(s)
- Karim Hajjar
- Department of Neurology, University Hospital Essen, Germany
| | - Tim Hagenacker
- Department of Neurology, University Hospital Essen, Germany
| |
Collapse
|
35
|
Skov M, de Paoli FV, Nielsen OB, Pedersen TH. The anti-convulsants lacosamide, lamotrigine, and rufinamide reduce myotonia in isolated human and rat skeletal muscle. Muscle Nerve 2017; 56:136-142. [PMID: 27783415 DOI: 10.1002/mus.25452] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Revised: 10/14/2016] [Accepted: 10/19/2016] [Indexed: 11/11/2022]
Abstract
INTRODUCTION In myotonia congenita, loss of ClC-1 Cl- channel function results in skeletal muscle hyperexcitability and myotonia. Anti-myotonic treatment has typically targeted the voltage-gated sodium channel in skeletal muscle (Nav1.4). In this study we explored whether 3 sodium channel-modulating anti-epileptics can reduce myotonia in isolated rat and human muscle. METHODS Dissected muscles were rendered myotonic by ClC-1 channel inhibition. The ability of the drugs to suppress myotonia was then assessed from subclinical to maximal clinical concentrations. Drug synergy was determined using isobole plots. RESULTS All drugs were capable of abolishing myotonia in both rat and human muscles. Lamotrigine and rufinamide completely suppressed myotonia at submaximal clinical concentrations, whereas lacosamide had to be raised above the maximal clinical concentration to suppress myotonia completely. A synergistic effect of lamotrigine and rufinamide was observed. CONCLUSION These findings suggest that lamotrigine and rufinamide could be considered for anti-myotonic treatment in myotonia congenita. Muscle Nerve 56: 136-142, 2017.
Collapse
Affiliation(s)
- Martin Skov
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000, Aarhus C, Denmark
| | - Frank V de Paoli
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000, Aarhus C, Denmark.,Department of Cardiothoracic and Vascular Surgery, Aarhus University Hospital Skejby, Aarhus, Denmark
| | - Ole B Nielsen
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000, Aarhus C, Denmark
| | - Thomas H Pedersen
- Department of Biomedicine, Aarhus University, Ole Worms Allé 4, 8000, Aarhus C, Denmark
| |
Collapse
|
36
|
Dobrynina LA, Kalashnikova LA, Bakulin IS, Kremneva EI, Krotenkova MV, Shamtieva KV. [Posterior reversible encephalopathy syndrome due to hypocalcemia: a description of a case and an analysis of a pathogenic role of electrolyte disturbances]. Zh Nevrol Psikhiatr Im S S Korsakova 2016; 116:70-77. [PMID: 27500881 DOI: 10.17116/jnevro20161167170-77] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Afemale patient with recurrent posterior reversible encephalopathy syndrome, severe hypocalcemia due to extirpation of the parathyroid glands is described. The disease was characterized by the acute development of headache, seizures, cognitive and behavioral disorders, mental confusion, transitory blood pressure increasing. The vasogenic edema in the posterior parts of the brain, detected by CT at the first exacerbation,was completely regressed. The residual neurological deficit and MRI changes remained after the recurrent exacerbations. Main clinical features of PRESare explained by hypocalcemia and accompanying electrolyte disturbances.The reported case shows the necessity to study blood electrolytes in patients with PRES to clarify their pathogenic role and the necessity of drug correction.
Collapse
|
37
|
Fielden MR, Dean C, Black K, Sawant SG, Subramanian R, Tomlinson JE, Walter S, Zimmermann C, Griggs MW, McKeon ME, Lewis EM, Beevers C, Pyrah I. Nonclinical Safety Profile of Etelcalcetide, a Novel Peptide Calcimimetic for the Treatment of Secondary Hyperparathyroidism. Int J Toxicol 2016; 35:294-308. [DOI: 10.1177/1091581816633407] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Etelcalcetide is a novel d-amino acid peptide that functions as an allosteric activator of the calcium-sensing receptor and is being developed as an intravenous calcimimetic for the treatment of secondary hyperparathyroidism in patients with chronic kidney disease on hemodialysis. To support clinical development and marketing authorization, a comprehensive nonclinical safety package was generated. Primary adverse effects included hypocalcemia, tremoring, and convulsions. Other adverse effects were considered sequelae of stress associated with hypocalcemia. Cardiovascular safety evaluations in the dog revealed an anticipated prolongation of the corrected QT interval that was related to reductions in serum calcium. Etelcalcetide did not affect the human ether-a-go-go gene ion channel current. Etelcalcetide was mutagenic in some strains of Salmonella, however, based on the negative results in 2 in vitro and 2 in vivo mammalian genotoxicity assays, including a 28-day Muta mouse study, etelcalcetide is considered nongenotoxic. Further support for a lack of genotoxicity was provided due to the fact that etelcalcetide was not carcinogenic in a 6-month transgenic rasH2 mouse model or a 2-year study in rats. There were no effects on fertility, embryo–fetal development, and prenatal and postnatal development. All of the adverse effects observed in both rat and dog were considered directly or secondarily related to the pharmacologic activity of etelcalcetide and the expected sequelae associated with dose-related reductions in serum calcium due to suppression of parathyroid hormone secretion. These nonclinical data indicate no safety signal of concern for human risk beyond that associated with hypocalcemia and associated QT prolongation.
Collapse
Affiliation(s)
- Mark R. Fielden
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| | - Charles Dean
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| | - Kurt Black
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| | - Satin G. Sawant
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| | - Raju Subramanian
- Pharmacokinetics and Drug Metabolism, Amgen Inc, Thousand Oaks, CA, USA
| | | | - Sarah Walter
- Cardiometabolic Disorders, Amgen Inc, Thousand Oaks, CA, USA
| | - Cameron Zimmermann
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| | | | | | | | | | - Ian Pyrah
- Comparative Biology and Safety Sciences, Amgen Inc, Thousand Oaks, CA, USA
| |
Collapse
|
38
|
Erol K, Yiğitaslan S, Ünel Ç, Kaygısız B, Yıldırım E. Evaluation of Cisplatin Neurotoxicity in Cultured Rat Dorsal Root Ganglia via Cytosolic Calcium Accumulation. Balkan Med J 2016; 33:144-51. [PMID: 27403382 DOI: 10.5152/balkanmedj.2016.161110] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 08/17/2015] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Calcium homeostasis is considered to be important in antineoplastic as well as in neurotoxic adverse effects of cisplatin. AIMS This study aimed to investigate the role of Ca(2+) in cisplatin neurotoxicity in cultured rat dorsal root ganglia (DRG) cells. STUDY DESIGN Cell culture study. METHODS DRG cells prepared from 1-day old Sprague-Dawley rats were used to determine the role of Ca(2+) in the cisplatin (10-600 μM) neurotoxicity. The cells were incubated with cisplatin plus nimodipine (1-3 μM), dizocilpine (MK-801) (1-3 μM) or thapsigargin (100-300 nM). Toxicity of cisplatinon DRG cells was determined by the MTT assay. RESULTS The neurotoxicity of cisplatin was significant when used in high concentrations (100-600 μM). Nimodipine (1 μM) but not MK-801 or thapsigargin prevented the neurotoxic effects of 200 μM of cisplatin. CONCLUSION Voltage-dependent calcium channels may play a role in cisplatin neurotoxicity.
Collapse
Affiliation(s)
- Kevser Erol
- Department of Pharmacology, Osmangazi University School of Medicine, Eskişehir, Turkey
| | - Semra Yiğitaslan
- Department of Pharmacology, Osmangazi University School of Medicine, Eskişehir, Turkey
| | - Çiğdem Ünel
- Department of Pharmacology, Osmangazi University School of Medicine, Eskişehir, Turkey
| | - Bilgin Kaygısız
- Department of Pharmacology, Osmangazi University School of Medicine, Eskişehir, Turkey
| | - Engin Yıldırım
- Department of Pharmacology, Osmangazi University School of Medicine, Eskişehir, Turkey
| |
Collapse
|
39
|
Preventive Effects of Bee Venom Derived Phospholipase A₂ on Oxaliplatin-Induced Neuropathic Pain in Mice. Toxins (Basel) 2016; 8:toxins8010027. [PMID: 26797636 PMCID: PMC4728549 DOI: 10.3390/toxins8010027] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 01/12/2016] [Accepted: 01/14/2016] [Indexed: 12/27/2022] Open
Abstract
Oxaliplatin, a chemotherapy drug used to treat colorectal cancer, induces specific sensory neurotoxicity signs that are aggravated by cold and mechanical stimuli. Here we examined the preventive effects of Bee Venom (BV) derived phospholipase A2 (bvPLA2) on oxaliplatin-induced neuropathic pain in mice and its immunological mechanism. The cold and mechanical allodynia signs were evaluated by acetone and von Frey hair test on the hind paw, respectively. The most significant allodynia signs were observed at three days after an injection of oxaliplatin (6 mg/kg, i.p.) and then decreased gradually to a normal level on days 7–9. The oxaliplatin injection also induced infiltration of macrophages and upregulated levels of the pro-inflammatory cytokine interleukin (IL)-1β in the lumbar dorsal root ganglia (DRG). Daily treatment with bvPLA2 (0.2 mg/kg, i.p.) for five consecutive days prior to the oxaliplatin injection markedly inhibited the development of cold and mechanical allodynia, and suppressed infiltration of macrophages and the increase of IL-1β level in the DRG. Such preventive effects of bvPLA2 were completely blocked by depleting regulatory T cells (Tregs) with CD25 antibody pre-treatments. These results suggest that bvPLA2 may prevent oxaliplatin-induced neuropathic pain by suppressing immune responses in the DRG by Tregs.
Collapse
|
40
|
Cui S, Tian Z, Pu S, Dai Y. Highly sensitive fluorescent sensor for Mg2+ and Ca2+ based on a multi-addressable diarylethene. RSC Adv 2016. [DOI: 10.1039/c5ra26910e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new photochromic diarylethene bearing 8-aminoquinoline unit was designed and synthesized, and the multi-addressable behaviors were investigated. It was highly sensitive towards Mg2+ and Ca2+ with different fluorescence emission and color change.
Collapse
Affiliation(s)
- Shiqiang Cui
- Department of Chemistry
- Nanchang University
- Nanchang
- P. R. China
- Jiangxi Key Laboratory of Organic Chemistry
| | - Zhaoyan Tian
- Jiangxi Key Laboratory of Organic Chemistry
- Jiangxi Science and Technology Normal University
- Nanchang
- PR China
| | - Shouzhi Pu
- Department of Chemistry
- Nanchang University
- Nanchang
- P. R. China
- Jiangxi Key Laboratory of Organic Chemistry
| | - Yanfeng Dai
- Department of Chemistry
- Nanchang University
- Nanchang
- P. R. China
| |
Collapse
|
41
|
Voltage-gated calcium channels: Determinants of channel function and modulation by inorganic cations. Prog Neurobiol 2015; 129:1-36. [PMID: 25817891 DOI: 10.1016/j.pneurobio.2014.12.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 12/15/2014] [Accepted: 12/27/2014] [Indexed: 11/20/2022]
Abstract
Voltage-gated calcium channels (VGCCs) represent a key link between electrical signals and non-electrical processes, such as contraction, secretion and transcription. Evolved to achieve high rates of Ca(2+)-selective flux, they possess an elaborate mechanism for selection of Ca(2+) over foreign ions. It has been convincingly linked to competitive binding in the pore, but the fundamental question of how this is reconcilable with high rates of Ca(2+) transfer remains unanswered. By virtue of their similarity to Ca(2+), polyvalent cations can interfere with the function of VGCCs and have proven instrumental in probing the mechanisms underlying selective permeation. Recent emergence of crystallographic data on a set of Ca(2+)-selective model channels provides a structural framework for permeation in VGCCs, and warrants a reconsideration of their diverse modulation by polyvalent cations, which can be roughly separated into three general mechanisms: (I) long-range interactions with charged regions on the surface, affecting the local potential sensed by the channel or influencing voltage-sensor movement by repulsive forces (electrostatic effects), (II) short-range interactions with sites in the ion-conducting pathway, leading to physical obstruction of the channel (pore block), and in some cases (III) short-range interactions with extracellular binding sites, leading to non-electrostatic modifications of channel gating (allosteric effects). These effects, together with the underlying molecular modifications, provide valuable insights into the function of VGCCs, and have important physiological and pathophysiological implications. Allosteric suppression of some of the pore-forming Cavα1-subunits (Cav2.3, Cav3.2) by Zn(2+) and Cu(2+) may play a major role for the regulation of excitability by endogenous transition metal ions. The fact that these ions can often traverse VGCCs can contribute to the detrimental intracellular accumulation of metal ions following excessive release of endogenous Cu(2+) and Zn(2+) or exposure to non-physiological toxic metal ions.
Collapse
|
42
|
Fehrenbacher JC. Chemotherapy-Induced Peripheral Neuropathy. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 131:471-508. [DOI: 10.1016/bs.pmbts.2014.12.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
43
|
Liu XF, Yu JQ, Dalan R, Liu AQ, Luo KQ. Biological factors in plasma from diabetes mellitus patients enhance hyperglycaemia and pulsatile shear stress-induced endothelial cell apoptosis. Integr Biol (Camb) 2014; 6:511-22. [PMID: 24643402 DOI: 10.1039/c3ib40265g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
People suffering from Diabetes Mellitus (DM) are prone to an array of vascular complications leading to end organ damage. The hallmark of these vascular complications is endothelium dysfunction, which is caused by endothelial cell (EC) apoptosis. Although the endothelial cell (EC) dysfunction induced by hyperglycaemia and fluid shear stress has been studied, the effects of biological factors in the blood of DM patients on EC integrity have not been reported in the in vitro models that mimic the physiological pulsatile nature of the vascular system. This study reports the development of a hemodynamic lab-on-a-chip system to investigate this issue. The pulsatile flow was applied to a monolayer of endothelial cells expressing a fluorescence resonance energy transfer (FRET)-based biosensor that changes colour from green to blue in response to caspase-3 activation during apoptosis. Plasma samples from healthy volunteers and DM patients were compared to identify biological factors that are critical to endothelial disruption. Three types of microchannels were designed to simulate the blood vessels under healthy and partially blocked pathological conditions. The results showed that EC apoptosis rates increased with increasing glucose concentration and levels of shear stress. The rates of apoptosis further increased by a factor of 1.4-2.3 for hyperglycaemic plasma under all dynamic conditions. Under static conditions, little difference was detected in the rate of EC apoptosis between experiments using plasma from DM patients and glucose medium, suggesting that the effects of hyperglycaemia and biological factors on the induction of EC apoptosis are all shear flow-dependent. A proteomics study was then conducted to identify biological factors, demonstrating that the levels of eight proteins, including haptoglobin and clusterin, were significantly down-regulated, while six proteins, including apolipoprotein C-III, were significantly up-regulated in the plasma of DM patients compared to healthy volunteers. This hemodynamic lab-on-a-chip system can serve as a high throughput platform to assess the risk of vascular complications of DM patients and to determine the effects of therapeutics or other interventions on EC apoptosis.
Collapse
Affiliation(s)
- X F Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.
| | | | | | | | | |
Collapse
|
44
|
|
45
|
Sereno M, Gutiérrez-Gutiérrez G, Gómez-Raposo C, López-Gómez M, Merino-Salvador M, Tébar FZ, Rodriguez-Antona C, Casado E. Oxaliplatin induced-neuropathy in digestive tumors. Crit Rev Oncol Hematol 2014; 89:166-78. [DOI: 10.1016/j.critrevonc.2013.08.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 08/09/2013] [Accepted: 08/16/2013] [Indexed: 12/27/2022] Open
|
46
|
Abstract
Control and modulation of electrical signaling is vital to normal physiology, particularly in neurons, cardiac myocytes, and skeletal muscle. The orchestrated activities of variable sets of ion channels and transporters, including voltage-gated ion channels (VGICs), are responsible for initiation, conduction, and termination of the action potential (AP) in excitable cells. Slight changes in VGIC activity can lead to severe pathologies including arrhythmias, epilepsies, and paralyses, while normal excitability depends on the precise tuning of the AP waveform. VGICs are heavily posttranslationally modified, with upward of 30% of the mature channel mass consisting of N- and O-glycans. These glycans are terminated typically by negatively charged sialic acid residues that modulate voltage-dependent channel gating directly. The data indicate that sialic acids alter VGIC activity in isoform-specific manners, dependent in part, on the number/location of channel sialic acids attached to the pore-forming alpha and/or auxiliary subunits that often act through saturating electrostatic mechanisms. Additionally, cell-specific regulation of sialylation can affect VGIC gating distinctly. Thus, channel sialylation is likely regulated through two mechanisms that together contribute to a dynamic spectrum of possible gating motifs: a subunit-specific mechanism and regulated (aberrant) changes in the ability of the cell to glycosylate. Recent studies showed that neuronal and cardiac excitability is modulated through regulated changes in voltage-gated Na(+) channel sialylation, suggesting that both mechanisms of differential VGIC sialylation contribute to electrical signaling in the brain and heart. Together, the data provide insight into an important and novel paradigm involved in the control and modulation of electrical signaling.
Collapse
Affiliation(s)
- Andrew R Ednie
- Programs in Cardiovascular Research and Neuroscience, Department of Molecular Pharmacology & Physiology, College of Medicine, University of South Florida, Tampa, Florida, USA
| | | |
Collapse
|
47
|
Verselis VK, Srinivas M. Connexin channel modulators and their mechanisms of action. Neuropharmacology 2013; 75:517-24. [PMID: 23597508 DOI: 10.1016/j.neuropharm.2013.03.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/11/2013] [Accepted: 03/15/2013] [Indexed: 10/27/2022]
Abstract
Gap junction channels and hemichannels formed by the connexin family of proteins play important roles in many aspects of tissue homeostasis in the brain and in other organs. In addition, connexin channels have been proposed as pharmacological targets in the treatment of a number of human disorders. In this review, we describe the connexin-subtype selectivity and specificity of pharmacological agents that are commonly used to modulate connexin channels. We also highlight recent progress made toward identifying new agents for connexin channels that act in a selective and specific manner. Finally, we discuss developing insights into possible mechanisms by which these agents modulate connexin channel function. This article is part of the Special Issue Section entitled 'Current Pharmacology of Gap Junction Channels and Hemichannels'.
Collapse
Affiliation(s)
- Vytas K Verselis
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY 10461, USA
| | - Miduturu Srinivas
- Department of Biological and Vision Sciences, SUNY College of Optometry, 33 West 42nd Street, New York, NY 10036, USA.
| |
Collapse
|
48
|
Baroni D, Barbieri R, Picco C, Moran O. Functional modulation of voltage-dependent sodium channel expression by wild type and mutated C121W-β1 subunit. J Bioenerg Biomembr 2013; 45:353-68. [DOI: 10.1007/s10863-013-9510-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 03/25/2013] [Indexed: 12/19/2022]
|
49
|
King JH, Zhang Y, Lei M, Grace AA, Huang CLH, Fraser JA. Atrial arrhythmia, triggering events and conduction abnormalities in isolated murine RyR2-P2328S hearts. Acta Physiol (Oxf) 2013; 207:308-23. [PMID: 22958452 DOI: 10.1111/apha.12006] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 08/15/2012] [Accepted: 09/03/2012] [Indexed: 12/19/2022]
Abstract
AIM RyR2 mutations are associated with catecholaminergic polymorphic tachycardia, a condition characterized by ventricular and atrial arrhythmias. The present experiments investigate the atrial electrophysiology of homozygotic murine RyR2-P2328S (RyR2(S/S)) hearts for ectopic triggering events and for conduction abnormalities that might provide a re-entrant substrate. METHODS Electrocardiograph recordings were made from regularly stimulated RyR2(S/S) and wild type (WT) hearts, perfused using a novel modified Langendorff preparation. This permitted the simultaneous use of either floating intracellular microelectrodes to measure action potential (AP) parameters, or a multielectrode array to measure epicardial conduction velocity (CV). RESULTS RyR2(S/S) showed frequent sustained tachyarrhythmias, delayed afterdepolarizations and ectopic APs, increased interatrial conduction delays, reduced epicardial CVs and reduced maximum rates of AP depolarization ((dV/dt)(max)), despite similar effective refractory periods, AP durations and AP amplitudes. Effective interatrial CVs and (dV/dt)(max) values of APs following ectopic (S2) stimulation were lower than those of APs following regular stimulation and decreased with shortening S1S2 intervals. However, although RyR2(S/S) atria showed arrhythmias over a wider range of S1S2 intervals, the interatrial CV and (dV/dt)(max) of S2 APs provoking such arrhythmias were similar in RyR2(S/S) and WT. CONCLUSIONS These results suggest that abnormal intracellular Ca(2+) homoeostasis produces both arrhythmic triggers and a slow-conducting arrhythmic substrate in RyR2(S/S) atria. A similar mechanism might also contribute to arrhythmogenesis in other conditions, associated with diastolic Ca(2+) release, such as atrial fibrillation.
Collapse
Affiliation(s)
- J. H. King
- Physiological Laboratory; University of Cambridge; Cambridge; UK
| | - Y. Zhang
- Physiological Laboratory; University of Cambridge; Cambridge; UK
| | - M. Lei
- Institute of Cardiovascular Sciences; University of Manchester; Manchester; UK
| | - A. A. Grace
- Department of Biochemistry; University of Cambridge; Cambridge; UK
| | | | - J. A. Fraser
- Physiological Laboratory; University of Cambridge; Cambridge; UK
| |
Collapse
|
50
|
Zhang X, Xia M, Li Y, Liu H, Jiang X, Ren W, Wu J, DeCaen P, Yu F, Huang S, He J, Clapham DE, Yan N, Gong H. Analysis of the selectivity filter of the voltage-gated sodium channel Na(v)Rh. Cell Res 2012; 23:409-22. [PMID: 23247626 DOI: 10.1038/cr.2012.173] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
NaChBac is a bacterial voltage-gated sodium (Nav) channel that shows sequence similarity to voltage-gated calcium channels. To understand the ion-permeation mechanism of Nav channels, we combined molecular dynamics simulation, structural biology and electrophysiological approaches to investigate the recently determined structure of NavRh, a marine bacterial NaChBac ortholog. Two Na(+) binding sites are identified in the selectivity filter (SF) in our simulations: The extracellular Na(+) ion first approaches site 1 constituted by the side groups of Ser181 and Glu183, and then spontaneously arrives at the energetically more favorable site 2 formed by the carbonyl oxygens of Leu179 and Thr178. In contrast, Ca(2+) ions are prone to being trapped by Glu183 at site 1, which then blocks the entrance of both Na(+) and Ca(2+) to the vestibule of the SF. In addition, Na(+) permeates through the selective filter in an asymmetrical manner, a feature that resembles that of the mammalian Nav orthologs. The study reported here provides insights into the mechanism of ion selectivity on Na(+) over Ca(2+) in mammalian Nav channels.
Collapse
Affiliation(s)
- Xu Zhang
- State Key Laboratory of Bio-membrane and Membrane Biotechnology, Tsinghua University, Beijing 100084, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|