Abstract:
BACKGROUND:Cisplatin (CDDP) is known to cause inner ear damage while carboplatin (CBDCA) induces less ototoxicity than CDDP. We examined apoptotic changes in the cochlea of guinea pigs after injection of CDDP or CBDCA using immunohistochemical and electrophysiological techniques. METHODS:Three days after the injection of each solution, the cochleas were immunohistochemically examined for the presence of fragments of single-stranded DNA (ssDNA). The auditory brain stem response was recorded before and three days after the injection. RESULTS:We detected fragments of ssDNA in the stria vascularis and the spiral ligament of the CDDP-treated cochlea. In this group, the threshold of the auditory brainstem response was significantly elevated, however, in the CBDCA group, no apparent change of the threshold was detected. In the CBDCA group, fragments of ssDNA were detected in the stria vascularis and the spiral ligament. The number of cells that stained positive for ssDNA, was less than that in the CDDP group. CONCLUSIONS:Our findings indicate that CBDCA induces less apoptosis than CDDP and that this phenomenon contributes to the ototoxicity of CDDP.
journal_name
Chemotherapyjournal_title
Chemotherapyauthors
Watanabe KC,Jinnouchi K,Hess A,Michel O,Baba S,Yagi Tdoi
10.1159/000057667subject
Has Abstractpub_date
2002-05-01 00:00:00pages
82-7issue
2eissn
0009-3157issn
1421-9794pii
57667journal_volume
48pub_type
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