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Lieberman OJ, Choi SJ, Kanter E, Saverchenko A, Frier MD, Fiore GM, Wu M, Kondapalli J, Zampese E, Surmeier DJ, Sulzer D, Mosharov EV. α-Synuclein-Dependent Calcium Entry Underlies Differential Sensitivity of Cultured SN and VTA Dopaminergic Neurons to a Parkinsonian Neurotoxin. eNeuro 2017; 4:ENEURO.0167-17.2017. [PMID: 29177188 PMCID: PMC5701296 DOI: 10.1523/eneuro.0167-17.2017] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 11/01/2017] [Accepted: 11/09/2017] [Indexed: 12/27/2022] Open
Abstract
Parkinson's disease (PD) is a debilitating neurodegenerative disease characterized by a loss of dopaminergic neurons in the substantia nigra (SN). Although mitochondrial dysfunction and dysregulated α-synuclein (aSyn) expression are postulated to play a role in PD pathogenesis, it is still debated why neurons of the SN are targeted while neighboring dopaminergic neurons of the ventral tegmental area (VTA) are spared. Using electrochemical and imaging approaches, we investigated metabolic changes in cultured primary mouse midbrain dopaminergic neurons exposed to a parkinsonian neurotoxin, 1-methyl-4-phenylpyridinium (MPP+). We demonstrate that the higher level of neurotoxicity in SN than VTA neurons was due to SN neuron-specific toxin-induced increase in cytosolic dopamine (DA) and Ca2+, followed by an elevation of mitochondrial Ca2+, activation of nitric oxide synthase (NOS), and mitochondrial oxidation. The increase in cytosolic Ca2+ was not caused by MPP+-induced oxidative stress, but rather depended on the activity of both L-type calcium channels and aSyn expression, suggesting that these two established pathogenic factors in PD act in concert.
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Affiliation(s)
- Ori J. Lieberman
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Se Joon Choi
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Ellen Kanter
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Anastasia Saverchenko
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Micah D. Frier
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Giulia M. Fiore
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Min Wu
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
| | - Jyothisri Kondapalli
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
| | - Enrico Zampese
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
| | - D. James Surmeier
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL 60611
| | - David Sulzer
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
- Department of Pharmacology, Columbia University Medical Center, New York, NY 10032
| | - Eugene V. Mosharov
- New York State Psychiatric Institute, Columbia University Medical Center, New York, NY 10032
- Department of Psychiatry, Columbia University Medical Center, New York, NY 10032
- Department of Neurology, Columbia University Medical Center, New York, NY 10032
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Nikiforaki D, Vanden Meerschaut F, de Roo C, Lu Y, Ferrer-Buitrago M, de Sutter P, Heindryckx B. Effect of two assisted oocyte activation protocols used to overcome fertilization failure on the activation potential and calcium releasing pattern. Fertil Steril 2016; 105:798-806.e2. [DOI: 10.1016/j.fertnstert.2015.11.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 10/21/2015] [Accepted: 11/02/2015] [Indexed: 12/22/2022]
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Nikiforaki D, Vanden Meerschaut F, De Gheselle S, Qian C, Van den Abbeel E, De Vos WH, Deroo T, De Sutter P, Heindryckx B. Sperm involved in recurrent partial hydatidiform moles cannot induce the normal pattern of calcium oscillations. Fertil Steril 2014; 102:581-588.e1. [DOI: 10.1016/j.fertnstert.2014.05.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 05/05/2014] [Accepted: 05/05/2014] [Indexed: 12/29/2022]
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Nikiforaki D, Vanden Meerschaut F, Qian C, De Croo I, Lu Y, Deroo T, Van den Abbeel E, Heindryckx B, De Sutter P. Oocyte cryopreservation and in vitro culture affect calcium signalling during human fertilization. Hum Reprod 2013; 29:29-40. [DOI: 10.1093/humrep/det404] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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Scaduto RC, Grotyohann LW. Hydrolysis of Ca2+-sensitive fluorescent probes by perfused rat heart. Am J Physiol Heart Circ Physiol 2003; 285:H2118-24. [PMID: 14561682 DOI: 10.1152/ajpheart.00881.2001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Rat hearts were loaded with the fluorescent calcium indicators fura 2, indo 1, rhod 2, or fluo 3 to determine cytosolic calcium levels in the perfused rat heart. With fura 2, however, basal tissue fluorescence increased above anticipated levels, suggesting accumulation of intermediates of fura 2-AM deesterification. To examine this process, we separated the intermediates of the deesterification process using HPLC after incubation of fura 2-AM with tissue homogenates and after loading in the rat heart. Loading of hearts with fura 2-AM resulted in tissue levels of fura 2 free acid that were only 5% of the total heart dye content of all fura 2 species. The parent fura 2-AM form accumulated without accumulation of intermediate products. Similar results were obtained with indo 1-AM. Fluo 3 loaded very poorly in perfused hearts. Unlike other indictors, rhod 2 rapidly loaded in perfused hearts and was completely converted to the free acid form. To determine the subcellular localization of the free acid form of these indictors, mitochondria from indicator-loaded hearts were assayed for the free acid form. Approximately 75% of the total amount of rhod 2 in hearts could be recovered in isolated mitochondria. Subcellular localization of indo 1 and fura 2 was more evenly distributed between mitochondria and nonmitochondrial compartments. We conclude that measurement of calcium in the perfused rat heart using surface fluorescence with either indo 1 or fura 2 is complicated by an inconsistent accumulation of the parent ester and that the resulting signal cannot be easily calibrated using “in situ” methods using the free acid form. Rhod 2 does not display this shortcoming, but like other indicators, it also loads into the mitochondrial matrix.
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Affiliation(s)
- Russell C Scaduto
- Department of Cellular and Molecular Physiology, Milton Hershey Medical Center, College of Medicine, The Pennsylvania State University, Hershey, PA 17033, USA.
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Beuckelmann DJ, Näbauer M, Erdmann E. Intracellular calcium handling in isolated ventricular myocytes from patients with terminal heart failure. Circulation 1992; 85:1046-55. [PMID: 1311223 DOI: 10.1161/01.cir.85.3.1046] [Citation(s) in RCA: 454] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Experiments were performed in human ventricular myocytes to investigate properties of excitation-contraction coupling in patients with terminal heart failure. Myocytes were isolated from left ventricular myocardium of patients with cardiac failure caused by dilated or ischemic cardiomyopathy undergoing transplantation. These results were compared with those obtained from cells of healthy donor hearts that for technical reasons were not suitable for transplantation. METHODS AND RESULTS [Ca2+]i transients and Ca2+ currents were recorded from isolated cells under voltage clamp perfused internally with the Ca2+ indicator fura 2. In cells that were stimulated externally, the cell-permeant form of the indicator, fura 2-AM, was used. When action potentials were to be recorded, cells were stimulated in current clamp mode. Unstimulated Ca2+ current densities were not significantly different in myopathic and control cells. In diseased myocytes, resting [Ca2+]i levels were 165 +/- 61 nmol/l, compared with 95 +/- 47 nmol/l in normal cells. With 5 mmol/l Na+ in the pipette, peak [Ca2+]i transients were 367 +/- 109 and 746 +/- 249 nmol/l, respectively. The decline of [Ca2+]i during diastole was significantly slower in myopathic cells than in control cells. This was a result of a prolongation of the action potential and of a reduced Ca2+ sequestration by the sarcoplasmic reticulum. CONCLUSIONS These results may partly explain the alterations of contractility in vivo in patients with heart failure.
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