Platinum drugs and neurotoxicity: effects on intracellular calcium homeostasis

[Pt( O , O ′-acac)(γ-acac)(DMS)] (PtAcacDMS) is a new platinum compound showing low reactivity with nucleobases and specific reactivity with sulfur ligands intracellularly. It induces apoptosis in breast cancer cells, but appears to be less neurotoxic to the developing cerebellum than cisplatin (cis...

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Veröffentlicht in:Cell biology and toxicology 2013-10, Vol.29 (5), p.339-353
Hauptverfasser: Piccolini, Valeria Maria, Bottone, Maria Grazia, Bottiroli, Giovanni, De Pascali, Sandra Angelica, Fanizzi, Francesco Paolo, Bernocchi, Graziella
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container_issue 5
container_start_page 339
container_title Cell biology and toxicology
container_volume 29
creator Piccolini, Valeria Maria
Bottone, Maria Grazia
Bottiroli, Giovanni
De Pascali, Sandra Angelica
Fanizzi, Francesco Paolo
Bernocchi, Graziella
description [Pt( O , O ′-acac)(γ-acac)(DMS)] (PtAcacDMS) is a new platinum compound showing low reactivity with nucleobases and specific reactivity with sulfur ligands intracellularly. It induces apoptosis in breast cancer cells, but appears to be less neurotoxic to the developing cerebellum than cisplatin (cisPt). The aim of this study was to assess the neurotoxicity of platinum compounds on calcium homeostasis in the dentate gyrus and Cornu Ammonis regions of the hippocampal formation during rat postnatal development. Two intracellular calcium homeostasis systems were taken for measurement, calbindin, a calcium buffer protein, and a plasma membrane calcium ATPase (PMCA1). The platinum compounds showed different effects on these markers in the two areas. One day after injection (PD11), cisPt decreased calbindin immunoreactivity and PMCA1 labeling in both regions; at PD17, the downregulation of PMCA1 persisted. Instead, PtAcacDMS produced varying effects on calbindin immunoreactivity in the two regions at PD11 and PD17; but in all cases, the changes incurred in calbindin immunoreactivity were counterbalanced by changes produced in PMCA1 expression. In conclusion, PtAcacDMS seems to affect calcium homeostasis in the central nervous system differently than cisPt. Both the platinum compounds act early to alter the calbindin buffering system. However, the most important difference between cisPt and PtAcacDMS is that, in vivo, the latter acts early to stimulate calcium efflux from nerve cells as reflected by its effect on PMCA1. The rapid onset of an activated calcium pump appears to be essential to cope with the excessive intracellular calcium concentration stemming from the downregulation of calbindin which could damage neuron function and morphology.
doi_str_mv 10.1007/s10565-013-9252-3
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It induces apoptosis in breast cancer cells, but appears to be less neurotoxic to the developing cerebellum than cisplatin (cisPt). The aim of this study was to assess the neurotoxicity of platinum compounds on calcium homeostasis in the dentate gyrus and Cornu Ammonis regions of the hippocampal formation during rat postnatal development. Two intracellular calcium homeostasis systems were taken for measurement, calbindin, a calcium buffer protein, and a plasma membrane calcium ATPase (PMCA1). The platinum compounds showed different effects on these markers in the two areas. One day after injection (PD11), cisPt decreased calbindin immunoreactivity and PMCA1 labeling in both regions; at PD17, the downregulation of PMCA1 persisted. Instead, PtAcacDMS produced varying effects on calbindin immunoreactivity in the two regions at PD11 and PD17; but in all cases, the changes incurred in calbindin immunoreactivity were counterbalanced by changes produced in PMCA1 expression. 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subjects Animals
Antineoplastic Agents - toxicity
Apoptosis
Biochemistry
Biomedical and Life Sciences
CA2 Region, Hippocampal - drug effects
CA2 Region, Hippocampal - growth & development
CA2 Region, Hippocampal - metabolism
CA2 Region, Hippocampal - pathology
CA3 Region, Hippocampal - drug effects
CA3 Region, Hippocampal - growth & development
CA3 Region, Hippocampal - metabolism
CA3 Region, Hippocampal - pathology
Calbindin 1 - metabolism
Calcium
Calcium - metabolism
Cell Biology
Central nervous system
Cisplatin - toxicity
Dentate Gyrus - drug effects
Dentate Gyrus - growth & development
Dentate Gyrus - metabolism
Dentate Gyrus - pathology
Developmental biology
Homeostasis
Homeostasis - drug effects
Immunohistochemistry
Life Sciences
Neurotoxicity
Organoplatinum Compounds - toxicity
Original Research
Pharmacology
Pharmacology/Toxicology
Plasma Membrane Calcium-Transporting ATPases - metabolism
Platinum
Rats
Rats, Wistar
Sulfur
title Platinum drugs and neurotoxicity: effects on intracellular calcium homeostasis
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