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Oezen G, Kraus L, Schentarra EM, Bolten JS, Huwyler J, Fricker G. Aluminum and ABC transporter activity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2024; 108:104451. [PMID: 38648870 DOI: 10.1016/j.etap.2024.104451] [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: 02/12/2024] [Revised: 04/06/2024] [Accepted: 04/16/2024] [Indexed: 04/25/2024]
Abstract
Aluminum is the third most common element on Earth´s crust and despite its wide use in our workaday life it has been associated with several health risks after overexposure. In the present study the impact of aluminum salts upon ABC transporter activity was studied in the P-GP-expressing human blood-brain barrier cell line hCMEC/D3, in MDCKII cells overexpressing BCRP and MRP2, respectively, and in freshly isolated, functionally intact kidney tubules from Atlantic killifish (Fundulus heteroclitus), which express the analog ABC transporters, P-gp, Bcrp and Mrp2. In contrast to previous findings with heavy metals salts (cadmium(II) chloride or mercury(II) chloride), which have a strong inhibitory effect on ABC transporter activity, or zinc(II) chloride and sodium arsenite, which have a stimulatory effect upon ABC transport function, the results indicate no modulatory effect of aluminum salts on the efflux activity of the human ABC transporters P-GP, BCRP and MRP2 nor on the analog transporters P-gp, Bcrp and Mrp2.
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Affiliation(s)
- Goezde Oezen
- Institute of Pharmacy and Molecular Biotechnology, Ruprecht-Karls University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States
| | - Lisa Kraus
- Institute of Pharmacy and Molecular Biotechnology, Ruprecht-Karls University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States
| | - Eva-Maria Schentarra
- Institute of Pharmacy and Molecular Biotechnology, Ruprecht-Karls University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States
| | - Jan Stephan Bolten
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States; Department of Pharmaceutical Sciences, University of Basel, Basel 4056, Switzerland
| | - Joerg Huwyler
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States; Department of Pharmaceutical Sciences, University of Basel, Basel 4056, Switzerland
| | - Gert Fricker
- Institute of Pharmacy and Molecular Biotechnology, Ruprecht-Karls University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States.
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Baraibar AM, de Pascual R, Carretero VJ, Liccardi N, Juárez NH, Hernández-Guijo JM. Aluminum alters excitability by inhibiting calcium, sodium, and potassium currents in bovine chromaffin cells. J Neurochem 2023; 165:162-176. [PMID: 36800503 DOI: 10.1111/jnc.15784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/20/2023] [Accepted: 02/06/2023] [Indexed: 02/19/2023]
Abstract
Aluminum (Al3+ ) has long been related to neurotoxicity and neurological diseases. This study aims to describe the specific actions of this metal on cellular excitability and neurotransmitter release in primary culture of bovine chromaffin cells. Using voltage-clamp and current-clamp recordings with the whole-cell configuration of the patch clamp technique, online measurement of catecholamine release, and measurements of [Ca2+ ]c with Fluo-4-AM, we have observed that Al3+ reduced intracellular calcium concentrations around 25% and decreased catecholamine secretion in a dose-dependent manner, with an IC50 of 89.1 μM. Al3+ blocked calcium currents in a time- and concentration-dependent manner with an IC50 of 560 μM. This blockade was irreversible since it did not recover after washout. Moreover, Al3+ produced a bigger blockade on N-, P-, and Q-type calcium channels subtypes (69.5%) than on L-type channels subtypes (50.5%). Sodium currents were also inhibited by Al3+ in a time- and concentration-dependent manner, 24.3% blockade at the closest concentration to the IC50 (399 μM). This inhibition was reversible. Voltage-dependent potassium currents were low affected by Al3+ . Nonetheless, calcium/voltage-dependent potassium currents were inhibited in a concentration-dependent manner, with an IC50 of 447 μM. This inhibition was related to the depression of calcium influx through voltage-dependent calcium channels subtypes coupled to BK channels. In summary, the blockade of these ionic conductance altered cellular excitability that reduced the action potentials firing and so, the neurotransmitter release and the synaptic transmission. These findings prove that aluminum has neurotoxic properties because it alters neuronal excitability by inhibiting the sodium currents responsible for the generation and propagation of impulse nerve, the potassium current responsible for the termination of action potentials, and the calcium current responsible for the neurotransmitters release.
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Affiliation(s)
- Andrés M Baraibar
- Department of Neurosciences, Universidad del País Vasco UPV/EHU, Leioa, Spain.,Achucarro Basque Center for Neuroscience, Leioa, Spain.,Biocruces Bizkaia Health Research Institute, Baracaldo, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain
| | | | | | - Ninfa Liccardi
- Department of Pharmacology and Therapeutic, Madrid, Spain
| | | | - Jesús M Hernández-Guijo
- Department of Pharmacology and Therapeutic, Madrid, Spain.,Instituto Teófilo Hernando, Facultad de Medicina, Univ. Autónoma de Madrid, Madrid, Spain.,Instituto Ramón y Cajal de Investigación Sanitaria, IRYCIS, Hospital Ramón y Cajal, Madrid, Spain
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Oezen G, Schentarra EM, Bolten JS, Huwyler J, Fricker G. Sodium arsenite but not aluminum chloride stimulates ABC transporter activity in renal proximal tubules of killifish (Fundulus heteroclitus). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 252:106314. [PMID: 36201872 DOI: 10.1016/j.aquatox.2022.106314] [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: 07/02/2022] [Revised: 09/12/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
ABC export proteins including Multidrug resistance-related protein 2 (Mrp2) serve as detoxification mechanism in renal proximal tubules due to active transport of xenobiotics and metabolic waste products into primary urine. The environmental pollutants aluminum and arsenic interfere with a multitude of regulatory mechanisms in the body and here their impact on ABC transporter function was studied. NaAsO2 but not AlCl3 rapidly stimulated Mrp2-mediated Texas Red (TR) transport in isolated renal proximal tubules from killifish, a well-established laboratory model for the determination of efflux transporter activity by utilizing fluorescent substrates for the ABC transporters of interest and confocal microscopy followed by image analysis. This observed stimulation remained unaffected by the translation inhibitor cycloheximide (CHX), but it was abrogated by antagonists and inhibitors of the endothelin receptor type B (ETB)/nitric oxide synthase (NOS)/protein kinase C (PKC) signaling pathway. NaAsO2-triggered effects were abolished as a consequence of PKCα inhibition through Gö6976 and PKCα inhibitor peptide C2-4. Phosphatidylinositol 3-kinase (PI3K) inhibitor LY 294,002 as well as the mammalian target of rapamycin (mTOR) inhibitor rapamycin suppressed NaAsO2-triggered stimulation of luminal TR transport. In addition, the stimulatory effect of NaAsO2 was abolished by GSK650394, an inhibitor of serum- and glucocorticoid-inducible kinase 1 (SGK1), which is an important downstream target. Environmentally relevant concentrations of NaAsO2 further stimulated transport function of P-glycoprotein (P-gp), Multidrug resistance-related protein 4 (Mrp4) and Breast cancer resistance protein (Bcrp) while AlCl3 was ineffective. To our knowledge, this is the first report engaging in the impact of NaAsO2 on efflux transporter signaling and it may contribute to the understanding of defense mechanisms versus this worrying pollutant.
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Affiliation(s)
- Goezde Oezen
- Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States
| | - Eva-Maria Schentarra
- Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States
| | - Jan Stephan Bolten
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States; Department of Pharmaceutical Sciences, University of Basel, Basel 4056, Switzerland
| | - Joerg Huwyler
- Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States; Department of Pharmaceutical Sciences, University of Basel, Basel 4056, Switzerland
| | - Gert Fricker
- Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, Heidelberg 69120, Germany; Mount Desert Island Biological Laboratory, Salisbury Cove, ME 04672, United States.
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Wang B, Luo X. A first-principles study on potential chelation agents and indicators of Alzheimer's disease. RSC Adv 2020; 10:35574-35581. [PMID: 35515673 PMCID: PMC9056942 DOI: 10.1039/d0ra06855a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Accepted: 09/15/2020] [Indexed: 11/25/2022] Open
Abstract
Human-serum transferrin is involved in the transportation of aluminum across the blood–brain barrier. Aluminum accumulation within the neuron causes the cell to degrade. In our research, we considered 12 potential chelators of aluminum from the aluminum–human serum transferrin complex and 3 potential indicators of Alzheimer's. We performed Density Functional Theory calculations comparing the binding energies of aluminum–chelator complexes and the binding energy of the aluminum–human serum transferrin complex and determined the charge transfer of the aluminum–chelator complex. Our results showed that CDTA is the only one that has direct chelation potential, but 1-ethyl-3-hydroxypyridin-2-one, citric acid, DTPA, oxalic acid, and salicylhydroxamic acid also had a strong and stable bond with aluminum and still have the ability to be potential chelators. The charge transfer calculation further enforces that these 6 chelators have strong and stable bonds with aluminum. Furthermore, we evaluated potential indicators of Alzheimer's disease. Metals that have a similar binding affinity to human serum transferrin as that of iron prove to be potential indicators of Alzheimer's disease. Due to the minimal difference in binding energies of the gallium–human serum transferrin complex and the indium–human serum transferrin complex to the iron–human serum transferrin complex, we determined that gallium and indium could be potential indicators of Alzheimer's disease. Human-serum transferrin is involved in the transportation of aluminum across the blood–brain barrier.![]()
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Affiliation(s)
- Bryan Wang
- National Graphene Research and Development Center
- Springfield
- USA
| | - Xuan Luo
- National Graphene Research and Development Center
- Springfield
- USA
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Saffioti NA, de Sautu M, Ferreira-Gomes MS, Rossi RC, Berlin J, Rossi JPFC, Mangialavori IC. E2P-like states of plasma membrane Ca 2+‑ATPase characterization of vanadate and fluoride-stabilized phosphoenzyme analogues. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1861:366-379. [PMID: 30419189 DOI: 10.1016/j.bbamem.2018.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 10/22/2018] [Accepted: 11/01/2018] [Indexed: 01/18/2023]
Abstract
The plasma membrane Ca2+‑ATPase (PMCA) belongs to the family of P-type ATPases, which share the formation of an acid-stable phosphorylated intermediate as part of their reaction cycle. The crystal structure of PMCA is currently lacking. Its abundance is approximately 0.1% of the total protein in the membrane, hampering efforts to produce suitable crystals for X-ray structure analysis. In this work we characterized the effect of beryllium fluoride (BeFx), aluminium fluoride (AlFx) and magnesium fluoride (MgFx) on PMCA. These compounds are known inhibitors of P-type ATPases that stabilize E2P ground, E2·P phosphoryl transition and E2·Pi product states. Our results show that the phosphate analogues BeFx, AlFx and MgFx inhibit PMCA Ca2+‑ATPase activity, phosphatase activity and phosphorylation with high apparent affinity. Ca2+‑ATPase inhibition by AlFx and BeFx depended on Mg2+ concentration indicating that this ion stabilizes the complex between these inhibitors and the enzyme. Low pH increases AlFx and BeFx but not MgFx apparent affinity. Eosin fluorescent probe binds with high affinity to the nucleotide binding site of PMCA. The fluorescence of eosin decreases when fluoride complexes bind to PMCA indicating that the environment of the nucleotide binding site is less hydrophobic in E2P-like states. Finally, measuring the time course of E → E2P-like conformational change, we proposed a kinetic model for the binding of fluoride complexes and vanadate to PMCA. In summary, our results show that these fluoride complexes reveal different states of phosphorylated intermediates belonging to the mechanism of hydrolysis of ATP by the PMCA.
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Affiliation(s)
- Nicolás A Saffioti
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Marilina de Sautu
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Mariela S Ferreira-Gomes
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Rolando C Rossi
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Joshua Berlin
- Department of Pharmacology and Physiology, New Jersey Medical School, Rutgers University, Newark, NJ, USA
| | - Juan Pablo F C Rossi
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina
| | - Irene C Mangialavori
- Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Química y Fisicoquímica Biológicas (IQUIFIB), Facultad de Farmacia y Bioquímica, Junín 956, Ciudad Autónoma de Buenos Aires C1113AAD, Argentina.
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