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Effects of synthetic cannabinoids on electroencephalogram power spectra in rats.
Forensic Sci Int 2012; 215(1-3):179-83FS

Abstract

Several synthetic cannabinoids have recently been distributed as psychoactive adulterants in many herbal products on the illegal drug market around the world. However, there is little information on pharmacology and toxicology of such compounds. Although Δ(9)-tetrahydrocannabinol (Δ(9)-THC), a psychoactive cannabinoid of marijuana, was reported to affect electroencephalograms (EEG) of rats, the effects of synthetic cannabinoids are unknown. We examined the pharmacological activities of three synthetic cannabinoids; cannabicyclohexanol (CCH), CP-47,497 and JWH-018; by analyzing EEG power spectra and locomotor activity after intraperitoneal administration to rats and compared them with those of Δ(9)-THC. The three compounds significantly increased the EEG power in the frequency range of 5.0-6.0 Hz for the first 3h, while Δ(9)-THC decreased the power spectra in the wide range of 7.0-20.0 Hz during the first hour. These results indicate that the effect of the three compounds on EEG is different from that of Δ(9)-THC. Additionally, CCH, CP-47,497 and JWH-018 significantly decreased the locomotor activity for 11.5h, 11h and 4.5h, respectively, after administration which was longer than that of Δ(9)-THC (3.5h). Furthermore, all three compounds significantly reduced the total amounts of locomotor activity during a 3-h, 6-h and 12-h period after injection, whereas no statistical difference was observed for the Δ(9)-THC injection. Among the three compounds, CCH and CP-47,497 exerted a longer duration of the change in the EEG power spectra and suppression of the locomotor activity than JWH-018.

Authors+Show Affiliations

National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan. nuchiyama@nihs.go.jpNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21640532

Citation

Uchiyama, Nahoko, et al. "Effects of Synthetic Cannabinoids On Electroencephalogram Power Spectra in Rats." Forensic Science International, vol. 215, no. 1-3, 2012, pp. 179-83.
Uchiyama N, Kikura-Hanajiri R, Matsumoto N, et al. Effects of synthetic cannabinoids on electroencephalogram power spectra in rats. Forensic Sci Int. 2012;215(1-3):179-83.
Uchiyama, N., Kikura-Hanajiri, R., Matsumoto, N., Huang, Z. L., Goda, Y., & Urade, Y. (2012). Effects of synthetic cannabinoids on electroencephalogram power spectra in rats. Forensic Science International, 215(1-3), pp. 179-83. doi:10.1016/j.forsciint.2011.05.005.
Uchiyama N, et al. Effects of Synthetic Cannabinoids On Electroencephalogram Power Spectra in Rats. Forensic Sci Int. 2012 Feb 10;215(1-3):179-83. PubMed PMID: 21640532.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of synthetic cannabinoids on electroencephalogram power spectra in rats. AU - Uchiyama,Nahoko, AU - Kikura-Hanajiri,Ruri, AU - Matsumoto,Naomi, AU - Huang,Zhi-Li, AU - Goda,Yukihiro, AU - Urade,Yoshihiro, Y1 - 2011/06/02/ PY - 2010/11/05/received PY - 2011/04/22/revised PY - 2011/05/05/accepted PY - 2011/6/7/entrez PY - 2011/6/7/pubmed PY - 2012/6/5/medline SP - 179 EP - 83 JF - Forensic science international JO - Forensic Sci. Int. VL - 215 IS - 1-3 N2 - Several synthetic cannabinoids have recently been distributed as psychoactive adulterants in many herbal products on the illegal drug market around the world. However, there is little information on pharmacology and toxicology of such compounds. Although Δ(9)-tetrahydrocannabinol (Δ(9)-THC), a psychoactive cannabinoid of marijuana, was reported to affect electroencephalograms (EEG) of rats, the effects of synthetic cannabinoids are unknown. We examined the pharmacological activities of three synthetic cannabinoids; cannabicyclohexanol (CCH), CP-47,497 and JWH-018; by analyzing EEG power spectra and locomotor activity after intraperitoneal administration to rats and compared them with those of Δ(9)-THC. The three compounds significantly increased the EEG power in the frequency range of 5.0-6.0 Hz for the first 3h, while Δ(9)-THC decreased the power spectra in the wide range of 7.0-20.0 Hz during the first hour. These results indicate that the effect of the three compounds on EEG is different from that of Δ(9)-THC. Additionally, CCH, CP-47,497 and JWH-018 significantly decreased the locomotor activity for 11.5h, 11h and 4.5h, respectively, after administration which was longer than that of Δ(9)-THC (3.5h). Furthermore, all three compounds significantly reduced the total amounts of locomotor activity during a 3-h, 6-h and 12-h period after injection, whereas no statistical difference was observed for the Δ(9)-THC injection. Among the three compounds, CCH and CP-47,497 exerted a longer duration of the change in the EEG power spectra and suppression of the locomotor activity than JWH-018. SN - 1872-6283 UR - https://www.unboundmedicine.com/medline/citation/21640532/abstract/Effects_of_synthetic_cannabinoids_on_electroencephalogram_power_spectra_in_rats_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0379-0738(11)00220-9 DB - PRIME DP - Unbound Medicine ER -