TY - JOUR
T1 - Dual GABAA receptor-mediated inhibition in rat presympathetic paraventricular nucleus neurons
AU - Park, Jin Bong
AU - Skalska, Silvia
AU - Son, Sookjin
AU - Stern, Javier E.
PY - 2007/7
Y1 - 2007/7
N2 - The inhibitory neurotransmitter GABA plays a key role in the modulation of paraventricular nucleus (PVN) neuronal excitability and sympathoexcitatory outflow, under both physiological and pathological conditions. In addition to mediating conventional synaptic transmission (phasic inhibition), GABAA receptors of distinct biophysical, molecular and pharmacological properties have been recently found to underlie a slower, persistent form of inhibition (tonic inhibition). Whether the 'tonic' inhibitory modality is present in presympathetic PVN neurons, and what its role is in modulating their activity is at present unknown. Here, we combined tract-tracing techniques with patch-clamp electrophysiology to address these questions. Recordings obtained from PVN-RVLM (rostral ventrolateral medulla) projecting neurons show that besides blocking GABAA-mediated inhibitory postsynaptic currents (IPSCs, Iphasic), the GABAA receptor blockers bicuculline and picrotoxin caused an outward shift in the holding current (Itonic). Conversely, the high affinity GABAA blocker gabazine blocked Iphasic without affecting Itonic. THIP, a GABAA receptor agonist that preferentially activates δ- over γ-containing receptors, enhanced the magnitude of Itonic. Our results also indicate that during conditions of strong and/or synchronous synaptic activity, Itonic may be activated by spillover of synaptically released GABA. Blockade of Itonic induced membrane depolarization, increased firing activity, and enhanced the input-output function of PVN-RVLM neurons. Altogether, our results support the presence of a persistent GABAA-mediated inhibitory modality in presympathetic PVN neurons, which plays a major role in modulating their excitability and firing activity.
AB - The inhibitory neurotransmitter GABA plays a key role in the modulation of paraventricular nucleus (PVN) neuronal excitability and sympathoexcitatory outflow, under both physiological and pathological conditions. In addition to mediating conventional synaptic transmission (phasic inhibition), GABAA receptors of distinct biophysical, molecular and pharmacological properties have been recently found to underlie a slower, persistent form of inhibition (tonic inhibition). Whether the 'tonic' inhibitory modality is present in presympathetic PVN neurons, and what its role is in modulating their activity is at present unknown. Here, we combined tract-tracing techniques with patch-clamp electrophysiology to address these questions. Recordings obtained from PVN-RVLM (rostral ventrolateral medulla) projecting neurons show that besides blocking GABAA-mediated inhibitory postsynaptic currents (IPSCs, Iphasic), the GABAA receptor blockers bicuculline and picrotoxin caused an outward shift in the holding current (Itonic). Conversely, the high affinity GABAA blocker gabazine blocked Iphasic without affecting Itonic. THIP, a GABAA receptor agonist that preferentially activates δ- over γ-containing receptors, enhanced the magnitude of Itonic. Our results also indicate that during conditions of strong and/or synchronous synaptic activity, Itonic may be activated by spillover of synaptically released GABA. Blockade of Itonic induced membrane depolarization, increased firing activity, and enhanced the input-output function of PVN-RVLM neurons. Altogether, our results support the presence of a persistent GABAA-mediated inhibitory modality in presympathetic PVN neurons, which plays a major role in modulating their excitability and firing activity.
UR - http://www.scopus.com/inward/record.url?scp=34447291597&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34447291597&partnerID=8YFLogxK
U2 - 10.1113/jphysiol.2007.133223
DO - 10.1113/jphysiol.2007.133223
M3 - Article
C2 - 17495040
AN - SCOPUS:34447291597
SN - 0022-3751
VL - 582
SP - 539
EP - 551
JO - Journal of Physiology
JF - Journal of Physiology
IS - 2
ER -