title: Modulation of firing activity by endogenous GABAA receptors in the globus pallidus of MPTP-treated parkinsonian mice.
abstract: The globus pallidus in rodents, equivalent to the external segment of the globus pallidus in primates, plays an important role in movement regulation. Previous studies have shown abundant γ-aminobutyric acid (GABA)ergic innervation and GABAA receptors in the globus pallidus. In this study, we investigated the effects of endogenous GABAA receptors on the spontaneous firing activity of pallidal neurons in both normal and MPTP-treated mice using multi-barrel electrodes extracellular recordings in vivo. We found that in normal mice, pressure ejection of 0.1 mmol/L gabazine, a specific GABAA receptor antagonist, increased the spontaneous firing rate of globus pallidus neurons by 27.6 ± 5.6%. Furthermore, in MPTP mice (14 days after MPTP treatment), 0.1 mmol/L gabazine increased the firing rates by 51.0 ± 7.9%, significantly greater than in normal mice. These results suggest that endogenous GABAA receptors modulate the activity of globus pallidus neurons. The present findings may provide a rationale for investigations into the potential role of GABAA receptors in Parkinson's disease.
authors.affiliation: Clinical Medicine 2009, Shandong University Medical School, Jinan, 250012, China.
authors.forename: Xin-Yi
authors.initials: XY
authors.lastname: Chen
authors.forename: Yan
authors.initials: Y
authors.lastname: Xue
authors.forename: Hua
authors.initials: H
authors.lastname: Wang
authors.forename: Su-Hong
authors.initials: SH
authors.lastname: Zhu
authors.forename: Xiao-Meng
authors.initials: XM
authors.lastname: Hao
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000818:Animals; D018756:GABA Antagonists / Q000494:pharmacology; D005917:Globus Pallidus / Q000187:drug effects / Q000503:physiopathology*; D020267:MPTP Poisoning / Q000503:physiopathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009474:Neurons / Q000187:drug effects / Q000502:physiology*; D011724:Pyridazines / Q000494:pharmacology; D011963:Receptors, GABA-A / Q000502:physiology*
chemical_list: D018756:GABA Antagonists; D011724:Pyridazines; D011963:Receptors, GABA-A; C049853:gabazine