Dextromethorphan affects cocaine-mediated behavioral pattern in parallel with a long-lasting Fos-related antigen-immunoreactivity

Hyoung Chun Kim, Guoying Bing, Eun Joo Shin, Hyun Seon Jhoo, Mi Ae Cheon, Seung Hyun Lee, Ki Hwan Choi, Joo Il Kim, Wang Kee Jhoo

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


In order to understand the underlying mechanisms responsible for the behaviors mediated by dextromethorphan (DM), we examined the effects of DM on locomotor activity and locomotor patterns in mice, and Fos-related antigen immunoreactivity (FRA-IR) of mouse brain following repeated administration of cocaine. Combined treatments (30 min prior to each cocaine administration) with DM dose-dependently decreased locomotor activity for high doses of cocaine (20 mg/kg, i.p./day × 7). DM combinations did not significantly affect hyperactivity for 10 mg cocaine/kg, i.p./day × 7. In contrast, combined treatments with DM increased the locomotor activity for 5 mg cocaine/kg, i.p./day × 7. These results were consistent with alterations in marginal activity. Repeated administration with cocaine or DM increased FRA-IR in the nucleus accumbens (NAc) and striatum which lasted for at least 7 days. Our results suggest that DM exhibits biphasic effects on the locomotor stimulation induced by cocaine, and that locomotor activities are in parallel with FRA-IR of the striatal complex. However, the role of FRA-IR regulated by DM or/and cocaine remains to be further determined.

Original languageEnglish
Pages (from-to)615-624
Number of pages10
JournalLife Sciences
Issue number6
StatePublished - Jun 29 2001

Bibliographical note

Funding Information:
This study was supported by BK project and a grant (# HMP-99-N-02-0003) of the Good Health Research and Development Project (1999) of the Ministry of Health and Welfare, Republic of Korea. We thank Drs. J.S. Hong and M.J. Iadarola for donating antiserum against FRA.


  • Cocaine
  • Dextromethorphan
  • Fos-related antigen protein
  • Locomotor activity

ASJC Scopus subject areas

  • General Pharmacology, Toxicology and Pharmaceutics
  • General Biochemistry, Genetics and Molecular Biology


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