Clin Psychopharmacol Neurosci.  2012 Dec;10(3):168-179. 10.9758/cpn.2012.10.3.168.

Iptakalim Preferentially Decreases Nicotine-induced Hyperlocomotion in Phencyclidine-sensitized Rats: A Potential Dual Action against Nicotine Addiction and Psychosis

Affiliations
  • 1Department of Psychology, University of Nebraska-Lincoln, Lincoln, NE, USA. mli2@unl.edu
  • 2Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, Nanjing Medical University, Nanjing, China.

Abstract


OBJECTIVE
Iptakalim is a putative ATP-sensitive potassium (KATP) channel opener. It is also a novel nicotinic acetylcholine receptor (nAChR) blocker and can antagonize nicotine-induced increase in dopamine release in the nucleus accumbens. Our recent work also shows that iptakalim exhibits a clozapine-like atypical antipsychotic profile, indicating that iptakalim may possess a dual action against nicotine addiction and schizophrenia.
METHODS
The present study examined the potential therapeutic effects of iptakalim on nicotine use in schizophrenia. We created an animal model of comorbidity of nicotine addiction and schizophrenia by injecting male Sprague-Dawley rats with nicotine (0.40 mg/kg, subcutaneously[sc]) or saline, in combination with phencyclidine (PCP, 3.0 mg/kg, sc) or saline daily for 14 consecutive days.
RESULTS
During the PCP/nicotine sensitization phase, PCP and nicotine independently increased motor activity over time. PCP also disrupted prepulse inhibition (PPI) of acoustic startle response. Acute nicotine treatment attenuated the PCP-induced hyperlocomotion and PCP-induced disruption of PPI, whereas repeated nicotine treatment potentiated these effects. Importantly, pretreatment with iptakalim (10-20 mg/kg, intraperitoneally) reduced nicotine-induced hyperlocomotion in a dose-dependent fashion. This reduction effect was highly selective: it was more effective in rats previously sensitized to the combination of PCP and nicotine, but less effective in rats sensitized to saline, nicotine alone or PCP alone.
CONCLUSION
To the extent that the combined nicotine and PCP sensitization mimics comorbid nicotine addiction in schizophrenia, the preferential inhibitory effect of iptakalim on nicotine-induced hyperlocomotion suggests that iptakalim may be a potential useful drug for the treatment nicotine abuse in schizophrenia.

Keyword

Iptakalim; Phencyclidine; Nicotine; Motor activity; Prepulse inhibition; Rats

MeSH Terms

Acoustics
Animals
Comorbidity
Dopamine
Humans
Male
Models, Animal
Motor Activity
Nicotine
Nucleus Accumbens
Phencyclidine
Potassium
Propylamines
Psychotic Disorders
Rats
Rats, Sprague-Dawley
Receptors, Nicotinic
Schizophrenia
Dopamine
Nicotine
Phencyclidine
Potassium
Propylamines
Receptors, Nicotinic
Full Text Links
  • CPN
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
    DB Error: unknown error