Histological effects of co-administration of an ACTH((4-9)) analogue, ORG 2766, on cisplatin ototoxicity in the albino guinea pig

RM Cardinaal, JCMJ de Groot, EH Huizing, JE Veldman, GF Smoorenburg*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)

Abstract

Cisplatin is one of the most potent antineoplastic drugs presently known, but its therapeutic efficacy is seriously limited by several side effects such as ototoxicity. Several compounds that are known for their nephroprotective effects also seem to reduce the incidence and severity of cisplatin-induced ototoxicity. Hamers et al. (1994) and De Groot et al. (1997) investigated the possibly protective effect of concomitant administration of the ACTH((4-9)) analogue ORG 2766 upon cisplatin ototoxicity in guinea pigs. Animals were treated with cisplatin at a daily dose of 2.0 mg/kg for 8 consecutive days and ORG 2766 at a daily dose of 75 mu g/kg for 9 days. Concomitant administration of cisplatin plus ORG 2766 resulted in a bimodal distribution of the electrophysiological data (compound action potential and cochlear microphonics amplitudes) and the histological data (outer hair cell (OHC) counts). It was surmised that this dichotomy might occur at a certain cisplatin dose. We investigated whether this protective effect of ORG 2766 could be enhanced by reducing the daily dose of cisplatin while maintaining the same dose of ORG 2766. Thirty-six animals were treated with daily i.p. injections of cisplatin at a dose of 1.0 mg/kg (n = 18) or 1.5 mg/kg (n = 18) for 8 consecutive days. When comparing the mean OHC counts of the different experimental groups, treatment with cisplatin at a daily dose of 1.5 mg/kg for 8 consecutive days resulted in a considerable loss of OHCs, which was significantly reduced after co-administration of ORG 2766. Co-treatment with ORG 2766 did not result in a change in the volume of the scala media. The present results are in agreement with the electrophysiological results published earlier (Stengs et al., 1998b). (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)157-167
Number of pages11
JournalHearing Research
Volume144
Issue number1-2
Publication statusPublished - Jun-2000

Keywords

  • cisplatin
  • guinea pig
  • ototoxicity
  • prevention
  • melanocortin
  • ORG 2766
  • ADENYLATE-CYCLASE
  • ELECTROPHYSIOLOGICAL EVIDENCE
  • CIS-DIAMMINEDICHLOROPLATINUM
  • INDUCED NEUROTOXICITY
  • SODIUM THIOSULFATE
  • AUDITORY NEURONS
  • ACTH(4-9) ANALOG
  • STRIA VASCULARIS
  • HAIR-CELLS
  • PROTECTION

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