scholarly journals Striatal cholinergic receptor activation causes a rapid, selective and state-dependent rise in cortico-striatal β activity

2018 ◽  
Vol 48 (8) ◽  
pp. 2857-2868 ◽  
Author(s):  
Benjamin R. Pittman-Polletta ◽  
Allison Quach ◽  
Ali I. Mohammed ◽  
Michael Romano ◽  
Krishnakanth Kondabolu ◽  
...  
Keyword(s):  
Cholinergic Receptor ◽  
Receptor Activation ◽  
State Dependent

scholarly journals Striatal cholinergic receptor activation causes a rapid, selective, & state-dependent rise in corticostriatal β activity

2017 ◽  
Author(s):  
Benjamin R. Pittman-Polletta ◽  
Allison Quach ◽  
Ali I. Mohammed ◽  
Michael Romano ◽  
Krishnakanth Kondabolou ◽  
...  
Keyword(s):  
Basal Ganglia ◽  
Cholinergic Receptor ◽  
Receptor Activation ◽  
Reverse Direction ◽  
Experimental Paradigm ◽  
Partial Directed Coherence ◽  
State Dependent ◽  
Cholinergic Tone ◽  
Movement Disability ◽  
Phase Amplitude

Cortico-basal ganglia-thalamic (CBT) β oscillations (15–30 Hz) are elevated in Parkinson’s disease and correlated with movement disability. To date, no experimental paradigm outside of loss of dopamine has been able to specifically elevate β oscillations in the CBT loop. Here, we show that activation of striatal cholinergic receptors selectively increased β oscillations in mouse striatum and motor cortex. In individuals showing simultaneous β increases in both striatum and M1, β partial directed coherence (PDC) increased from striatum to M1 (but not in the reverse direction). In individuals that did not show simultaneous β increases, β PDC increased from M1 to striatum (but not in the reverse direction), and M1 was characterized by persistent β-HFO phase-amplitude coupling. Finally, the direction of β PDC distinguished between β subbands. This suggests: (1) striatal cholinergic tone exerts state-dependent and frequency-selective control over CBT β power and coordination; (2) ongoing rhythmic dynamics can determine whether elevated β oscillations are expressed in striatum and M1; (3) altered striatal cholinergic tone differentially modulates distinct β subbands.

Cholinergic modulation of synaptic inhibition in the guinea pig hippocampus in vitro: excitation of GABAergic interneurons and inhibition of GABA-release

1993 ◽  
Vol 69 (2) ◽  
pp. 626-629 ◽  
Author(s):  
J. C. Behrends ◽  
G. ten Bruggencate
Keyword(s):  
Guinea Pig ◽  
Synaptic Transmission ◽  
Pyramidal Neurons ◽  
Gaba Release ◽  
Cholinergic Receptor ◽  
Receptor Activation ◽  
Release Mechanism ◽  
Gabaergic Interneurons ◽  
Gamma Aminobutyric Acid

1. The effect of cholinergic receptor activation on gamma-aminobutyric acid (GABA)-mediated inhibitory synaptic transmission was investigated in voltage-clamped CA1 pyramidal neurons (HPNs) in the guinea pig hippocampal slice preparation. 2. The cholinergic agonist carbachol (1-10 microM) induced a prominent and sustained increase in the frequency and amplitudes of spontaneous inhibitory postsynaptic currents (IPSCs) in Cl(-)-loaded HPNs. The potentiation of spontaneous IPSCs was not dependent on excitatory synaptic transmission but was blocked by atropine (1 microM). 3. Monosynaptically evoked IPSCs were reversibly depressed by carbachol (10 microM). 4. The frequency of miniature IPSCs recorded in the presence of tetrodotoxin (0.6 or 1.2 microM) was reduced by carbachol (10 or 20 microM) in an atropine-sensitive manner. 5. We conclude that, while cholinergic receptor activation directly excites hippocampal GABAergic interneurons, it has, in addition, a suppressant effect on the synaptic release mechanism at GABAergic terminals. This dual modulatory pattern could explain the suppression of evoked IPSCs despite enhanced spontaneous transmission.

scholarly journals Acetylcholine disinhibits hippocampal circuits to enable rapid formation of overlapping memory ensembles

2017 ◽  
Author(s):  
Luke Y. Prince ◽  
Krasimira Tsaneva-Atanasova ◽  
Claudia Clopath ◽  
Jack R. Mellor
Keyword(s):  
Granule Cells ◽  
Mossy Fiber ◽  
Pyramidal Cells ◽  
Cholinergic Receptor ◽  
Receptor Activation ◽  
Cellular Excitability ◽  
Rapid Formation ◽  
Ca3 Pyramidal Cells ◽  
Episodic Memories ◽  
Spiking Neural Network Model

AbstractIn the hippocampus, episodic memories are thought to be encoded by the formation of ensembles of synaptically coupled CA3 pyramidal cells driven by sparse but powerful mossy fiber inputs from dentate gyrus granule cells. Acetylcholine is proposed as the salient signal that determines which memories are encoded but its actions on mossy fiber transmission are largely unknown. Here, we show experimentally that cholinergic receptor activation suppresses feedforward inhibition and enhances excitatory-inhibitory ratio. In reconstructions of CA3 pyramidal cells, this disinhibition enables postsynaptic dendritic depolarization required for synaptic plasticity at CA3-CA3 recurrent synapses. We further show in a spiking neural network model of CA3 how a combination of disinhibited mossy fiber activity, enhanced cellular excitability and reduced recurrent synapse strength can drive rapid overlapping ensemble formation. Thus, we propose a coordinated set of mechanisms by which acetylcholine release enables the selective encoding of salient high-density episodic memories in the hippocampus.

scholarly journals State-dependent changes in olfactory cortical networks via cholinergic modulation

2018 ◽  
Author(s):  
Donald A. Wilson ◽  
Maxime Juventin ◽  
Maria Ilina ◽  
Alessandro Pizzo ◽  
Catia Teixeira
Keyword(s):  
Olfactory Bulb ◽  
Entorhinal Cortex ◽  
Synaptic Input ◽  
Piriform Cortex ◽  
Receptor Activation ◽  
Relative Strength ◽  
Top Down ◽  
Cortical Networks ◽  
Bottom Up ◽  
State Dependent

AbstractActivity in sensory cortical networks reflects both peripheral sensory input and intra‐ and inter-cortical network input. How sensory cortices balance these diverse inputs to provide relatively stable, accurate representations of the external world is not well understood. Furthermore, neuromodulation could alter the balance of these inputs in a state‐ and behavior-dependent manner. Here, we used optogenetic stimulation to directly assay the relative strength of bottom-up (olfactory bulb) and top-down (lateral entorhinal cortex) synaptic inputs to piriform cortex in freely moving rats. Optotrodes in the piriform cortex were used to test the relative strength of these two inputs, in separate animals, with extracellular, monosynaptic evoked potentials. The results suggest a rapid state-dependent shift in the balance of bottom-up and top-down inputs to PCX, with enhancement in the strength of lateral entorhinal cortex synaptic input and stability or depression of olfactory bulb synaptic input during slow-wave sleep compared to waking. The shift is in part due to a state-dependent change in cholinergic tone as assessed with fiber photometry of GCaMP6 fluorescence in basal forebrain ChAT+ neurons, and blockade of the state-dependent synaptic shift with cholinergic muscarinic receptor activation.

scholarly journals Diabetes with and without ketoacidosis on right atrial pacemaker rate and autonomic responsiveness

1997 ◽  
Vol 273 (4) ◽  
pp. H1888-H1893 ◽  
Author(s):  
Kristine K. Hicks ◽  
Ernst Seifen ◽  
Joseph R. Stimers ◽  
Richard H. Kennedy
Keyword(s):  
Insulin Dependent Diabetes Mellitus ◽  
Cholinergic Receptor ◽  
Receptor Activation ◽  
Diabetic Rats ◽  
Right Atrial ◽  
Dependent Diabetes Mellitus ◽  
Half Maximal Effective Concentration ◽  
Insulin Dependent ◽  
Chronotropic Action ◽  
Right Atria

Experiments were designed to determine whether insulin-dependent diabetes mellitus (IDDM) alters direct chronotropic effects of adrenergic and cholinergic agonists and whether the observed changes are associated with hyperglycemia or combined hyperglycemia and ketoacidosis. Diabetes was induced by intravenous administration of 45, 50, or 65 mg/kg streptozotocin (STZ). Rats treated with 65 mg/kg STZ had higher levels of blood glucose and ketones compared with the levels of the other groups. Right atria were isolated 12 wk after administration of STZ and bathed in Krebs-Henseleit solution. Basal spontaneous pacemaker rate was diminished in preparations isolated from diabetic rats. The maximum pacemaker rate observed during exposure to isoproterenol or norepinephrine was also depressed in preparations from diabetic animals; however, the increase in rate and half-maximal effective concentration values for each agent were not affected. The sensitivity to the negative chronotropic action of acetylcholine was enhanced by IDDM, whereas the response to carbachol (a cholinergic agonist not readily metabolized by acetylcholinesterase) was not changed. No significant differences were observed when we compared preparations isolated from diabetic animals with and without ketoacidosis. In summary, these data suggest 1) that IDDM is associated with a diminished basal spontaneous pacemaker without changes in the responsiveness to adrenergic and cholinergic receptor activation and 2) that ketoacidosis does not play a role in the observed alterations.

scholarly journals Phosphorylation-State-Dependent Regulation of NMDA Receptor Short-Term Plasticity Modifies Hippocampal Dendritic Ca2+ Transients

2010 ◽  
Vol 104 (4) ◽  
pp. 2203-2213 ◽  
Author(s):  
Debika Chatterjea ◽  
Edaeni Hamid ◽  
John P. Leonard ◽  
Simon Alford
Keyword(s):  
Nmda Receptor ◽  
Pyramidal Neurons ◽  
Long Term Potentiation ◽  
Receptor Activation ◽  
Short Term ◽  
Short Term Plasticity ◽  
State Dependent ◽  
Term Potentiation ◽  
Protocol Enhancement

N-methyl-d-aspartate (NMDA) receptor-mediated currents are enhanced by phosphorylation. We have investigated effects of phosphorylation-dependent short-term plasticity of NMDA receptor-mediated excitatory postsynaptic currents (EPSCs) on the induction of long-term depression (LTD). We confirmed in whole cell clamped CA1 pyramidal neurons that LTD is induced by pairing stimulus protocols. However, after serine-threonine phosphorylation was modified by postsynaptic introduction of a protein phosphatase-1 (PP1) inhibitor, the same pairing protocol evoked long-term potentiation (LTP). We determined effects of modification of phosphatase activity on evoked NMDA EPSCs during LTD induction protocols. During LTD induction, using a protocol pairing depolarization to –40 mV and 0.5 Hz stimulation, NMDA receptor-mediated EPSCs undergo a short-term enhancement at the start of the protocol. In neurons in which PP1 activity was inhibited, this short-term enhancement was markedly amplified. We then investigated the effect of this enhancement on Ca2+ entry during the start of the LTD induction protocol. Enhancement of NMDA receptor-mediated responses was accompanied by an amplification of induction protocol-evoked Ca2+ transients. Furthermore, this amplification required synaptic activation during the protocol, consistent with an enhancement of Ca2+ entry mediated by NMDA receptor activation. The sign of NMDA receptor-mediated long-term plasticity, whether potentiation or depression depends on the amplitude of the synaptic Ca2+ transient during induction. We conclude that short-term phosphorylation-dependent plasticity of the NMDA receptor-mediated EPSCs contributes significantly to the effect of phosphatase inhibition on the subsequent induction of LTD or LTP.

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