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Baraibar AM, de Pascual R, Rodriguez Angulo HO, Mijares A, Hernández-Guijo JM. Pro-arrhythmogenic effects of Trypanosoma cruzi conditioned medium proteins in a model of bovine chromaffin cells. Parasitology 2021; 148:1612-1623. [PMID: 34384512 PMCID: PMC11010060 DOI: 10.1017/s003118202100130x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/07/2021] [Accepted: 07/08/2021] [Indexed: 11/05/2022]
Abstract
Asymptomatic sudden death is the principal cause of mortality in Chagas disease. There is little information about molecular mechanisms involved in the pathophysiology of malignant arrhythmias in Chagasic patients. Previous studies have involved Trypanosoma cruzi secretion proteins in the genesis of arrhythmias ex vivo, but the molecular mechanisms involved are still unresolved. Thus, the aim was to determine the effect of these secreted proteins on the cellular excitability throughout to test its effects on catecholamine secretion, sodium-, calcium-, and potassium-conductance and action potential (AP) firing. Conditioned medium was obtained from the co-culture of T. cruzi and Vero cells (African green monkey kidney cells) and ultra-filtered for concentrating immunogenic high molecular weight parasite proteins. Chromaffin cells were assessed with the parasite and Vero cells control medium. Parasite-secreted proteins induce catecholamine secretion in a dose-dependent manner. Additionally, T. cruzi conditioned medium induced depression of both calcium conductance and calcium and voltage-dependent potassium current. Interestingly, this fact was related to the abolishment of the hyperpolarization phase of the AP produced by the parasite medium. Taken together, these results suggest that T. cruzi proteins may be involved in the genesis of pro-arrhythmic conditions that could influence the appearance of malignant arrhythmias in Chagasic patients.
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Affiliation(s)
- A. M. Baraibar
- Department of Neuroscience, University of Minnesota, 4-158 Jackson Hall, 321 Church St s.e., Minneapolis, MN55455, USA
| | - R. de Pascual
- Department of Pharmacology and Therapeutic, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029Madrid, Spain
- Institute ‘Teófilo Hernando’, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029Madrid, Spain
| | - H. O. Rodriguez Angulo
- Laboratorio de Fisiología de Parásitos, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
| | - A. Mijares
- Laboratorio de Fisiología de Parásitos, Instituto Venezolano de Investigaciones Científicas, Caracas, Venezuela
| | - J. M. Hernández-Guijo
- Department of Pharmacology and Therapeutic, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029Madrid, Spain
- Institute ‘Teófilo Hernando’, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029Madrid, Spain
- IRYCIS, School of Medicine, Universidad Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029Madrid, Spain
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Gutiérrez J, Baraibar AM, Albiñana E, Velasco P, Solís JM, Hernández-Guijo JM. Methylmercury reduces synaptic transmission and neuronal excitability in rat hippocampal slices. Pflugers Arch 2018; 470:1221-1230. [DOI: 10.1007/s00424-018-2144-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/21/2018] [Accepted: 04/05/2018] [Indexed: 01/22/2023]
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Albiñana E, Luengo JG, Baraibar AM, Muñoz MD, Gandía L, Solís JM, Hernández-Guijo JM. Choline induces opposite changes in pyramidal neuron excitability and synaptic transmission through a nicotinic receptor-independent process in hippocampal slices. Pflugers Arch 2017; 469:779-795. [PMID: 28176016 DOI: 10.1007/s00424-017-1939-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 01/17/2017] [Accepted: 01/19/2017] [Indexed: 01/13/2023]
Abstract
Choline is present at cholinergic synapses as a product of acetylcholine degradation. In addition, it is considered a selective agonist for α5 and α7 nicotinic acetylcholine receptors (nAChRs). In this study, we determined how choline affects action potentials and excitatory synaptic transmission using extracellular and intracellular recording techniques in CA1 area of hippocampal slices obtained from both mice and rats. Choline caused a reversible depression of evoked field excitatory postsynaptic potentials (fEPSPs) in a concentration-dependent manner that was not affected by α7 nAChR antagonists. Moreover, this choline-induced effect was not mimicked by either selective agonists or allosteric modulators of α7 nAChRs. Additionally, this choline-mediated effect was not prevented by either selective antagonists of GABA receptors or hemicholinium, a choline uptake inhibitor. The paired pulse facilitation paradigm, which detects whether a substance affects presynaptic release of glutamate, was not modified by choline. On the other hand, choline induced a robust increase of population spike evoked by orthodromic stimulation but did not modify that evoked by antidromic stimulation. We also found that choline impaired recurrent inhibition recorded in the pyramidal cell layer through a mechanism independent of α7 nAChR activation. These choline-mediated effects on fEPSP and population spike observed in rat slices were completely reproduced in slices obtained from α7 nAChR knockout mice, which reinforces our conclusion that choline modulates synaptic transmission and neuronal excitability by a mechanism independent of nicotinic receptor activation.
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Affiliation(s)
- E Albiñana
- Department of Pharmacology and Therapeutic, University Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029, Madrid, Spain.,Instituto Teófilo Hernando, Facultad de Medicina, University Autónoma de Madrid, 28029, Madrid, Spain
| | - J G Luengo
- Department of Pharmacology and Therapeutic, University Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029, Madrid, Spain.,Instituto Teófilo Hernando, Facultad de Medicina, University Autónoma de Madrid, 28029, Madrid, Spain
| | - A M Baraibar
- Department of Pharmacology and Therapeutic, University Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029, Madrid, Spain.,Instituto Teófilo Hernando, Facultad de Medicina, University Autónoma de Madrid, 28029, Madrid, Spain
| | - M D Muñoz
- Servicio de Neurología Experimental, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
| | - L Gandía
- Department of Pharmacology and Therapeutic, University Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029, Madrid, Spain.,Instituto Teófilo Hernando, Facultad de Medicina, University Autónoma de Madrid, 28029, Madrid, Spain
| | - J M Solís
- Servicio de Neurobiología-Investigación, Hospital Universitario Ramón y Cajal, IRYCIS, 28034, Madrid, Spain
| | - J M Hernández-Guijo
- Department of Pharmacology and Therapeutic, University Autónoma de Madrid, Av. Arzobispo Morcillo 4, 28029, Madrid, Spain. .,Instituto Teófilo Hernando, Facultad de Medicina, University Autónoma de Madrid, 28029, Madrid, Spain.
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