Two types of GABAergic miniature inhibitory postsynaptic currents in mouse substantia gelatinosa neurons.
The physiological and pharmacological properties of gamma-aminobutyric acid (GABA)ergic miniature inhibitory postsynaptic currents (mIPSCs) were investigated in substantia gelatinosa neurons of mouse spinal cord using whole-cell patch clamp recordings. Two cell populations were pharmacologically identified based on the effect of propofol (10 muM) on the mIPSC decay kinetics: those exhibiting propofol-sensitive mIPSCs, with a slow decay kinetic (mIPSC(SLOW)), and those exhibiting propofol-resistant mIPSCs, with a fast decay kinetic (mIPSC(FAST)) (decay time constants of 14.2+/-0.7 and 7.4+/-0.8 ms, respectively). The frequency and amplitude of both types of mIPSCs were not affected by propofol. Miniature IPSC(FAST) showed midazolam insensitivity, while midazolam prolonged the decay phase of mIPSC(SLOW) without modulation of the frequency and amplitude. Exogenous GABA-evoked responses in the neurons with mIPSC(SLOW) were potentiated by propofol, while those in neurons with mIPSC(FAST) were unaffected by propofol. Furthermore, non-stationary noise analysis of the two kinetically and pharmacologically distinct mIPSCs revealed different conductance of GABA(A) receptor channels underlying the synaptic events. Pharmacological responses to propofol and midazolam suggested that mIPSC(FAST) and mIPSC(SLOW) in substantia gelatinosa neurons can be mediated by GABA(A) receptors with different subunit compositions.
Takahashi
Ayako
A
Department of Anesthesiology, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan.
Tokunaga
Atsushi
A
Yamanaka
Hiroki
H
Mashimo
Takashi
T
Noguchi
Koichi
K
Uchida
Ichiro
I
D000818:Animals; D004351:Drug Resistance; D004594:Electrophysiology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology*; D018757:GABA Modulators / Q000494:pharmacology; D006993:Hypnotics and Sedatives / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008874:Midazolam / Q000494:pharmacology; D009474:Neurons / Q000187:drug effects / Q000502:physiology* / Q000648:ultrastructure; D018408:Patch-Clamp Techniques; D015742:Propofol / Q000494:pharmacology; D011963:Receptors, GABA-A / Q000187:drug effects; D013116:Spinal Cord / Q000187:drug effects; D013376:Substantia Gelatinosa / Q000187:drug effects / Q000502:physiology*; D005680:gamma-Aminobutyric Acid / Q000502:physiology*
D018757:GABA Modulators; D006993:Hypnotics and Sedatives; D011963:Receptors, GABA-A; D005680:gamma-Aminobutyric Acid; D008874:Midazolam; D015742:Propofol