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Review
. 2015 Apr;20(4):411-32.
doi: 10.1634/theoncologist.2014-0044. Epub 2015 Mar 12.

Platinum-induced neurotoxicity and preventive strategies: past, present, and future

Affiliations
Review

Platinum-induced neurotoxicity and preventive strategies: past, present, and future

Abolfazl Avan et al. Oncologist. 2015 Apr.

Abstract

Neurotoxicity is a burdensome side effect of platinum-based chemotherapy that prevents administration of the full efficacious dosage and often leads to treatment withdrawal. Peripheral sensory neurotoxicity varies from paresthesia in fingers to ataxic gait, which might be transient or irreversible. Because the number of patients being treated with these neurotoxic agents is still increasing, the need for understanding the pathogenesis of this dramatic side effect is critical. Platinum derivatives, such as cisplatin and carboplatin, harm mainly peripheral nerves and dorsal root ganglia neurons, possibly because of progressive DNA-adduct accumulation and inhibition of DNA repair pathways (e.g., extracellular signal-regulated kinase 1/2, c-Jun N-terminal kinase/stress-activated protein kinase, and p38 mitogen-activated protein kinass), which finally mediate apoptosis. Oxaliplatin, with a completely different pharmacokinetic profile, may also alter calcium-sensitive voltage-gated sodium channel kinetics through a calcium ion immobilization by oxalate residue as a calcium chelator and cause acute neurotoxicity. Polymorphisms in several genes, such as voltage-gated sodium channel genes or genes affecting the activity of pivotal metal transporters (e.g., organic cation transporters, organic cation/carnitine transporters, and some metal transporters, such as the copper transporters, and multidrug resistance-associated proteins), can also influence drug neurotoxicity and treatment response. However, most pharmacogenetics studies need to be elucidated by robust evidence. There are supportive reports about the effectiveness of several neuroprotective agents (e.g., vitamin E, glutathione, amifostine, xaliproden, and venlafaxine), but dose adjustment and/or drug withdrawal seem to be the most frequently used methods in the management of platinum-induced peripheral neurotoxicity. To develop alternative options in the treatment of platinum-induced neuropathy, studies on in vitro models and appropriate trials planning should be integrated into the future design of neuroprotective strategies to find the best patient-oriented solution.

Keywords: Models; Neurotoxicity; Pathogenesis; Platinum; Polymorphism; Prevention.

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Conflict of interest statement

Disclosures of potential conflicts of interest may be found at the end of this article.

Figures

Figure 1.
Figure 1.
Effects of platinated compounds (Pt) and potential mechanisms of action. Pt may enter tumor cells (Pt influx) via copper transporter, organic cation transporters, and organic cation/carnitine transporters or by passive diffusion. DNA-platinum adducts block DNA replication, transcription, and other nuclear functions and also activate signal transduction pathways, which result in apoptosis and necrosis in tumor cells. In dividing tumor cells, the formation of DNA adducts is supposed to cause growth inhibition and cell kill, hence eliminating the tumor cells. DNA damage is recognized via high mobility group nonhistone proteins (HMG1 and HMG2) and/or various DNA repair pathways, depending on the Pt analog. GSH and MTN can neutralize Pt (e.g., by a complex that can be effluxed). MRPs (multidrug resistance-associated proteins, e.g., MRP2, also known as ABCC2) and some other efflux transporters (ATP7A and ATP7B) can excrete Pt from cells (Pt efflux). The increased repair of DNA damage and protection with GSH, as well as dysregulation in apoptosis pathways and reduced Pt influx and increased Pt efflux, can induce Pt resistance. Abbreviations: ERK, extracellular signal-regulated kinase; GSH, reduced glutathione; HMG, high mobility group nonhistone protein; JNK, c-Jun N-terminal kinase; MAPK, mitogen-activated protein kinase; MTN, metallothionein protein; PKB (Akt), protein kinase B; Pt, platinated compounds; Sapk, stress-activated protein kinase.
Figure 2.
Figure 2.
Mechanism of acute and chronic platinum-induced neurotoxicity. Oxaliplatin may impair normal calcium-sensitive voltage-gated sodium channels, which cause acute neurotoxicity. Platinated compound (Pt) adducts can accumulate in dorsal root ganglia and lead to chronic neurotoxicity. Because these cells are postmitotic and not dividing, the formation of DNA adducts is not lethal to neurons. Increased Pt influx by organic cation transporters (OCTs) and organic cation/carnitine transporters (OCTNs), as well as polymorphisms and/or overexpression of some genes that play a role in Pt metabolism (e.g., in OCT, OCTN, and GSH), can contribute to Pt-induced neurotoxicity. Abbreviations: GSH, reduced glutathione; Pt, platinated compounds; VG, voltage-gated.

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