title: GABAA receptor in the thalamic specific relay system contributes to the propofol-induced somatosensory cortical suppression in rat.
abstract: Interaction with the gamma-aminobutyric-acid-type-A (GABAA) receptors is recognized as an important component of the mechanism of propofol, a sedative-hypnotic drug commonly used as anesthetic. However the contribution of GABAA receptors to the central nervous system suppression is still not well understood, especially in the thalamocortical network. In the present study, we investigated if intracerebral injection of bicuculline (a GABAA receptor antagonist) into the thalamus ventral posteromedial nucleus (VPM, a thalamus specific relay nuclei that innervated S1 mostly) could reverse propofol-induced cortical suppression, through recording the changes of both spontaneous and somatosensory neural activities in rat's somatosensory cortex (S1). We found that after injection of bicuculline into VPM, significant increase of neural activities were observed in all bands of local field potentials (total band, 182±6%), while the amplitude of all components in somatosensory evoked potentials were also increased (negative, 121±9% and positive, 124±6%).These data support that the potentiation of GABAA receptor-mediated synaptic inhibition in a thalamic specific relay system seems to play a crucial role in propofol-induced cortical suppression in the somatosensory cortex of rats.
authors: Department of Anesthesiology, Affiliated Hospital of Zunyi Medical College, Zunyi, Guizhou, China.
authors: Yu
authors: Y
authors: Zhang
authors: Chaoping
authors: C
authors: Wang
authors: Yi
authors: Y
authors: Zhang
authors: Lin
authors: L
authors: Zhang
authors: Tian
authors: T
authors: Yu
mesh_terms: D000344:Afferent Pathways; D018686:Anesthetics, Intravenous / Q000008:administration & dosage / Q000494:pharmacology; D000818:Animals; D001640:Bicuculline / Q000008:administration & dosage / Q000494:pharmacology; D005073:Evoked Potentials, Somatosensory; D005260:Female; D058787:GABA-A Receptor Antagonists / Q000008:administration & dosage / Q000494:pharmacology; D008297:Male; D015742:Propofol / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D011963:Receptors, GABA-A / Q000378:metabolism*; D013003:Somatosensory Cortex / Q000187:drug effects* / Q000502:physiology*; D009435:Synaptic Transmission / Q000187:drug effects; D013788:Thalamus / Q000187:drug effects / Q000378:metabolism*; D020651:Ventral Thalamic Nuclei / Q000187:drug effects / Q000378:metabolism
chemical_list: D018686:Anesthetics, Intravenous; D058787:GABA-A Receptor Antagonists; D011963:Receptors, GABA-A; D001640:Bicuculline; D015742:Propofol