title: Inhibitory effects of berberine against morphine-induced locomotor sensitization and analgesic tolerance in mice.
abstract: We previously reported that a methanolic extract of Coptis japonica, which is a well-known traditional oriental medicine, inhibits morphine-induced conditioned place preference (CPP) in mice. Berberine is a major component of Coptis japonica extract, and it has been established that the adverse effects of morphine on the brain involve dopamine (DA) receptors. However, to our knowledge, no study has investigated the inhibitory effects of berberine on morphine-induced locomotor sensitization and analgesic tolerance in mice. Here, we investigated the effects of berberine on morphine-induced locomotor sensitization and on the development of analgesic tolerance. Furthermore, we examined the effects of berberine treatment on N-methyl-D-aspartate (NMDA) receptor channel activity expressed in Xenopus laevis oocytes. Berberine was found to completely block both morphine-induced locomotor sensitization and analgesic tolerance, and reduce D(1) and NMDA receptor bindings in the cortex. Moreover, berberine markedly inhibited NMDA current in Xenopus laevis oocytes expressing NMDA receptor subunits. Our results suggest that the inhibitory effects of berberine on morphine-induced locomotor sensitization and analgesic tolerance are closely related to the modulation of D1 and NMDA receptors, and that berberine should be viewed as a potential novel means of attenuating morphine-induced sensitization and analgesic tolerance.
authors.affiliation: Department of Pharmacology, College of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors.forename: J-H
authors.initials: JH
authors.lastname: Yoo
authors.forename: E-M
authors.initials: EM
authors.lastname: Yang
authors.forename: J-H
authors.initials: JH
authors.lastname: Cho
authors.forename: J-H
authors.initials: JH
authors.lastname: Lee
authors.forename: S M
authors.initials: SM
authors.lastname: Jeong
authors.forename: S-Y
authors.initials: SY
authors.lastname: Nah
authors.forename: H-C
authors.initials: HC
authors.lastname: Kim
authors.forename: K-W
authors.initials: KW
authors.lastname: Kim
authors.forename: S-H
authors.initials: SH
authors.lastname: Kim
authors.forename: S-Y
authors.initials: SY
authors.lastname: Lee
authors.forename: C-G
authors.initials: CG
authors.lastname: Jang
mesh_terms: D000818:Animals; D001599:Berberine / Q000737:chemistry / Q000494:pharmacology*; D001921:Brain / Q000187:drug effects* / Q000378:metabolism / Q000503:physiopathology; D004195:Disease Models, Animal; D004298:Dopamine / Q000378:metabolism; D004361:Drug Tolerance / Q000502:physiology*; D005260:Female; D018698:Glutamic Acid / Q000378:metabolism; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D015394:Molecular Structure; D009020:Morphine / Q000009:adverse effects / Q000037:antagonists & inhibitors*; D009021:Morphine Dependence / Q000188:drug therapy* / Q000503:physiopathology; D009043:Motor Activity / Q000187:drug effects* / Q000502:physiology; D009294:Narcotics / Q000009:adverse effects; D009865:Oocytes; D021122:Protein Subunits / Q000187:drug effects / Q000378:metabolism; D017447:Receptors, Dopamine D1 / Q000187:drug effects / Q000378:metabolism; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects / Q000378:metabolism; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology; D014981:Xenopus
chemical_list: D009294:Narcotics; D021122:Protein Subunits; D017447:Receptors, Dopamine D1; D016194:Receptors, N-Methyl-D-Aspartate; D001599:Berberine; D018698:Glutamic Acid; D009020:Morphine; D004298:Dopamine