Δ9-tetrahydrocannabinol prolongs the immobility time in the mouse forced swim test: Involvement of cannabinoid CB1 receptor and serotonergic system

Nobuaki Egashira, Tomomi Matsuda, Emi Koushi, Fuminori Higashihara, Kenichi Mishima, Shozo Chidori, Nobuyoshi Hasebe, Katsunori Iwasaki, Ryoji Nishimura, Ryozo Oishi, Michihiro Fujiwara

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In the present study, we investigated the effect of Δ9-tetrahydrocannabinol (THC), the principal psychoactive component of marijuana, on immobility time during the forced swim test. THC (2 and 6 mg/kg, i.p.) significantly prolonged the immobility time. In addition, THC at the same doses did not significantly affect locomotor activity in the open-field test. The selective cannabinoid CB1 receptor antagonist rimonabant (3 mg/kg, i.p.) significantly reduced the enhancement of immobility by THC (6 mg/kg). Similarly, the selective serotonin (5-HT) reuptake inhibitor (SSRI) citalopram (10 mg/kg, i.p.) and 5-HT1A/7 receptor agonist 8-hydroxy-2-(di-n-propylamino) tetralin (8-OH-DPAT, 0.3 mg/kg, i.p.) significantly reduced this THC-induced effect. Moreover, the selective 5-HT1A receptor antagonist N-[2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl]-N-(2-pyridinyl) cyclohexane carboxamide dihydrochloride (WAY100635, 1 mg/kg, i.p.) and the postsynaptic 5-HT1A receptor antagonist MM-77 (0.1 mg/kg, i.p.) reversed this reduction effect of 8-OH-DPAT (0.3 mg/kg). In contrast, the selective 5-HT7 receptor antagonist (R)-3-[2-[2-(4-methylpiperidin-1-yl)ethyl]pyrrolidine-1-sulfonyl]phenol hydrochloride (SB269970) had no effect on this reduction effect of 8-OH-DPAT. WAY100635 (1 mg/kg) also reversed the reduction effect of citalopram (10 mg/kg). These findings suggest that the 5-HT1A receptors are involved in THC-induced enhancement of immobility.

Original languageEnglish
Pages (from-to)117-121
Number of pages5
JournalEuropean Journal of Pharmacology
Volume589
Issue number1-3
DOIs
Publication statusPublished - Jul 28 2008

All Science Journal Classification (ASJC) codes

  • Pharmacology

Fingerprint Dive into the research topics of 'Δ<sup>9</sup>-tetrahydrocannabinol prolongs the immobility time in the mouse forced swim test: Involvement of cannabinoid CB<sub>1</sub> receptor and serotonergic system'. Together they form a unique fingerprint.

  • Cite this

    Egashira, N., Matsuda, T., Koushi, E., Higashihara, F., Mishima, K., Chidori, S., Hasebe, N., Iwasaki, K., Nishimura, R., Oishi, R., & Fujiwara, M. (2008). Δ9-tetrahydrocannabinol prolongs the immobility time in the mouse forced swim test: Involvement of cannabinoid CB1 receptor and serotonergic system. European Journal of Pharmacology, 589(1-3), 117-121. https://doi.org/10.1016/j.ejphar.2008.03.046