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2014 ; 134
(5
): 448-54
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Cisplatin and oxaliplatin are toxic to cochlear outer hair cells and both target
thioredoxin reductase in organ of Corti cultures
#MMPMID24702224
Dammeyer P
; Hellberg V
; Wallin I
; Laurell G
; Shoshan M
; Ehrsson H
; Arnér ES
; Kirkegaard M
Acta Otolaryngol
2014[May]; 134
(5
): 448-54
PMID24702224
show ga
CONCLUSION: Inhibition of thioredoxin reductase (TrxR) may be a contributing
factor in cisplatin-induced ototoxicity. Direct exposure of organ of Corti to
cisplatin and oxaliplatin gives equal loss of hair cells. OBJECTIVES:
Platinum-containing drugs are known to target the anti-oxidant selenoprotein TrxR
in cancer cells. Two such anti-cancer, platinum-containing drugs, cisplatin and
oxaliplatin, have different side effects. Only cisplatin induces hearing loss,
i.e. has an ototoxic side effect that is not seen after treatment with
oxaliplatin. The objective of this study was to evaluate if TrxR is a target in
the cochlea. Loss of outer hair cells was also compared when cisplatin and
oxaliplatin were administered directly to the organ of Corti. METHODS: Organ of
Corti cell culture was used for direct exposure to cisplatin and oxaliplatin.
Hair cells were evaluated and the level of TrxR was assessed. Immunohistochemical
staining for TrxR was performed. An animal model was used to evaluate the effect
on TrxR after treatment with cisplatin and oxaliplatin in vivo. RESULTS: Direct
exposure of cochlear organotypic cultures to either cisplatin or oxaliplatin
induced comparable levels of outer hair cell loss and inhibition of TrxR,
demonstrating that both drugs are similarly ototoxic provided that the cochlea
becomes directly exposed.