High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN)
The pedunculopontine nucleus (PPN) is part of the Reticular Activating System, and active during waking and REM sleep. Previous results showed that all PPN cells plateau at gamma frequencies and intrinsic membrane oscillations in PPN neurons are mediated by high-threshold N- and P/Q-type Ca2+ channe...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2051817X_v3_n6_p_Luster http://hdl.handle.net/20.500.12110/paper_2051817X_v3_n6_p_Luster |
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paper:paper_2051817X_v3_n6_p_Luster2023-06-08T16:33:57Z High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) Arousal Gamma oscillations N-type P/Q-type Rats Waking cadmium calcium channel calcium channel blocking agent calcium channel N type calcium channel P type calcium channel Q type cesium omega agatoxin IVA omega conotoxin GVIA synapse receptor tetrodotoxin adult animal experiment animal model animal tissue Article calcium current controlled study gamma rhythm hyperpolarization immunocytochemistry nonhuman oscillation patch clamp technique pedunculopontine tegmental nucleus peristaltic pump rat REM sleep signal processing The pedunculopontine nucleus (PPN) is part of the Reticular Activating System, and active during waking and REM sleep. Previous results showed that all PPN cells plateau at gamma frequencies and intrinsic membrane oscillations in PPN neurons are mediated by high-threshold N- and P/Q-type Ca2+ channels. The present study was designed to determine whether some PPN cells have only N-, only P/Q-, or both N- and P/Q-type Ca2+ channels. We used patch-clamp recordings in PPN cells in slices from anesthetized rat pups in the presence of synaptic receptor blockers (SB) and Tetrodotoxin (TTX), and applied ramps to induce intrinsic membrane oscillations. We found that all PPN cell types showed gamma oscillations in the presence of SB+TTX when using current ramps. In 50% of cells, the N-type Ca2+ channel blocker ω-Conotoxin-GVIA (ω-CgTx) reduced gamma oscillation amplitude, while subsequent addition of the P/Q-type blocker ω-Agatoxin-IVA (ω-Aga) blocked the remaining oscillations. Another 20% manifested gamma oscillations that were not significantly affected by the addition of ω-CgTx, however, ω-Aga blocked the remaining oscillations. In 30% of cells, ω-Aga had no effect on gamma oscillations, while ω-CgTx blocked them. These novel results confirm the segregation of populations of PPN cells as a function of the calcium channels expressed, that is, the presence of cells in the PPN that manifest gamma band oscillations through only N-type, only P/Q-type, and both N-type and P/Q-type Ca2+ channels. © 2015 The Authors. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2051817X_v3_n6_p_Luster http://hdl.handle.net/20.500.12110/paper_2051817X_v3_n6_p_Luster |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Arousal Gamma oscillations N-type P/Q-type Rats Waking cadmium calcium channel calcium channel blocking agent calcium channel N type calcium channel P type calcium channel Q type cesium omega agatoxin IVA omega conotoxin GVIA synapse receptor tetrodotoxin adult animal experiment animal model animal tissue Article calcium current controlled study gamma rhythm hyperpolarization immunocytochemistry nonhuman oscillation patch clamp technique pedunculopontine tegmental nucleus peristaltic pump rat REM sleep signal processing |
| spellingShingle |
Arousal Gamma oscillations N-type P/Q-type Rats Waking cadmium calcium channel calcium channel blocking agent calcium channel N type calcium channel P type calcium channel Q type cesium omega agatoxin IVA omega conotoxin GVIA synapse receptor tetrodotoxin adult animal experiment animal model animal tissue Article calcium current controlled study gamma rhythm hyperpolarization immunocytochemistry nonhuman oscillation patch clamp technique pedunculopontine tegmental nucleus peristaltic pump rat REM sleep signal processing High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| topic_facet |
Arousal Gamma oscillations N-type P/Q-type Rats Waking cadmium calcium channel calcium channel blocking agent calcium channel N type calcium channel P type calcium channel Q type cesium omega agatoxin IVA omega conotoxin GVIA synapse receptor tetrodotoxin adult animal experiment animal model animal tissue Article calcium current controlled study gamma rhythm hyperpolarization immunocytochemistry nonhuman oscillation patch clamp technique pedunculopontine tegmental nucleus peristaltic pump rat REM sleep signal processing |
| description |
The pedunculopontine nucleus (PPN) is part of the Reticular Activating System, and active during waking and REM sleep. Previous results showed that all PPN cells plateau at gamma frequencies and intrinsic membrane oscillations in PPN neurons are mediated by high-threshold N- and P/Q-type Ca2+ channels. The present study was designed to determine whether some PPN cells have only N-, only P/Q-, or both N- and P/Q-type Ca2+ channels. We used patch-clamp recordings in PPN cells in slices from anesthetized rat pups in the presence of synaptic receptor blockers (SB) and Tetrodotoxin (TTX), and applied ramps to induce intrinsic membrane oscillations. We found that all PPN cell types showed gamma oscillations in the presence of SB+TTX when using current ramps. In 50% of cells, the N-type Ca2+ channel blocker ω-Conotoxin-GVIA (ω-CgTx) reduced gamma oscillation amplitude, while subsequent addition of the P/Q-type blocker ω-Agatoxin-IVA (ω-Aga) blocked the remaining oscillations. Another 20% manifested gamma oscillations that were not significantly affected by the addition of ω-CgTx, however, ω-Aga blocked the remaining oscillations. In 30% of cells, ω-Aga had no effect on gamma oscillations, while ω-CgTx blocked them. These novel results confirm the segregation of populations of PPN cells as a function of the calcium channels expressed, that is, the presence of cells in the PPN that manifest gamma band oscillations through only N-type, only P/Q-type, and both N-type and P/Q-type Ca2+ channels. © 2015 The Authors. |
| title |
High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| title_short |
High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| title_full |
High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| title_fullStr |
High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| title_full_unstemmed |
High-threshold Ca2+ channels behind gamma band activity in the pedunculopontine nucleus (PPN) |
| title_sort |
high-threshold ca2+ channels behind gamma band activity in the pedunculopontine nucleus (ppn) |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_2051817X_v3_n6_p_Luster http://hdl.handle.net/20.500.12110/paper_2051817X_v3_n6_p_Luster |
| _version_ |
1768543726591803392 |