Abstract：
AIMS:Oxaliplatin (l-OHP) is a key drug in therapeutic regimens for metastatic or advanced-stage colorectal cancer, but causes peripheral neuropathy as a dose-limiting adverse effect. It is reported that this peripheral neuropathy results from l-OHP accumulation in dorsal root ganglion (DRG) neurons, and that one of the transporters responsible for the accumulation in DRG neurons is organic cation transporter novel (OCTN) 1. Here, we examined whether co-administration of ergothioneine, a substrate/inhibitor of OCTN1, with l-OHP could prevent this peripheral neuropathy. MAIN METHODS:l-OHP (4 mg/kg, i.p., twice/week, for 6 weeks) and ergothioneine or l-carnitine (1.5 or 15 mg/kg, i.v., twice per l-OHP administration) were administered to rats, and tissue/cellular platinum concentrations and peripheral neuropathy were determined. Expression of transporters in DRG neuronal cells was evaluated by real-time PCR and immunocytochemistry. KEY FINDINGS:On administration of l-OHP to rats, it accumulated in DRG neurons and their mitochondria, while negligible accumulation was found in Schwann cells. Expression of OCTN1 was observed in DRG neurons, especially in small- and medium-sized ones, which are responsible for the nociceptive response. In rats repeatedly administered l-OHP, co-administration of ergothioneine (15 mg/kg), but not l-carnitine, a substrate/inhibitor of OCTN2, decreased l-OHP accumulation in DRGs and development of the mechanical allodynia. SIGNIFICANCE:These results indicated that l-OHP-induced peripheral neuropathy was ameliorated by co-administration of ergothioneine, at least in part, via a decrease in its accumulation in DRG neurons. Plant diets contain ergothioneine, and thus their consumption might offer relief to patients suffering from l-OHP-induced peripheral neuropathy.
journal_name
Life Scijournal_title
Life sciencesauthors
Nishida K,Takeuchi K,Hosoda A,Sugano S,Morisaki E,Ohishi A,Nagasawa Kdoi
10.1016/j.lfs.2018.07.006subject
Has Abstractpub_date
2018-08-15 00:00:00pages
516-524eissn
0024-3205issn
1879-0631pii
S0024-3205(18)30383-7journal_volume
207pub_type
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