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Cholinergic Neurons: Neurotransmission01:23

Cholinergic Neurons: Neurotransmission

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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Cholinergic Receptors: Muscarinic01:25

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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
The subtypes M1, M3, and M5 couple with the Gq subunit and activate the phospholipase C (PLC) activity, mobilizing intracellular Ca2+....
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Cholinergic Receptors: Nicotinic01:15

Cholinergic Receptors: Nicotinic

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Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
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Indirect-Acting Cholinergic Agonists: Mechanism of Action01:18

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Indirect-acting cholinergic agonists work by interacting with an enzyme called acetylcholinesterase (AChE) in the synaptic cleft. They can be reversible or irreversible inhibitors and have different effects on the enzyme.
Reversible inhibitors like edrophonium bind to a specific part of the enzyme called the anionic catalytic site. They form noncovalent bonds, which means they are not strongly attached to the enzyme. This creates a temporary and less stable enzyme–inhibitor complex,...
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...
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Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
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Probing Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices via Laser Flash Photolysis of Photoactivatable Nicotine
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Transiciones asincrónicas activación del receptor de acetilcolina primaria

Mackenzie J Thompson1, Christian J G Tessier2, Anna Ananchenko1

  • 1Department of Biochemistry, Microbiology, and Immunology, University of Ottawa, Ottawa, ON, Canada.

Science (New York, N.Y.)
|October 2, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La unión del agonista a los receptores de acetilcolina nicotínica muscular estabiliza las estructuras intermedias, revelando un mecanismo de activación secuencial. Este hallazgo explica cómo estos receptores, cruciales para la comunicación sináptica, hacen la transición entre estados inactivos y activos.

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Área de la Ciencia:

  • La neurociencia
  • Biología estructural
  • La bioquímica

Sus antecedentes:

  • Los receptores postsinápticos median la comunicación sináptica mediante la conversión de señales químicas en respuestas eléctricas.
  • Los canales iónicos ligandos sufren cambios conformacionales al unirse al agonista, lo que lleva a la apertura del canal e influye en la señalización postsináptica.

Objetivo del estudio:

  • Aclarar los mecanismos estructurales subyacentes a la activación del receptor de acetilcolina nicotínica de tipo muscular.
  • Para determinar las estructuras del receptor en estados no ligados, monoligados y diligados.

Principales métodos:

  • Determinación estructural de alta resolución del receptor de acetilcolina nicotínica de tipo muscular.
  • Registros de un solo canal para correlacionar los estados estructurales con la actividad funcional.

Principales resultados:

  • La unión del agonista a un solo sitio induce un estado cerrado en el que una subunidad adopta una conformación similar a la activa, mientras que la otra permanece inactiva.
  • Se identificó una estructura intermedia, revelando transiciones de subunidad asincrónicas durante la activación del receptor.

Conclusiones:

  • La activación del receptor de acetilcolina nicotínica de tipo muscular se produce a través de un mecanismo secuencial que incluye transiciones asincrónicas de subunidades.
  • Este mecanismo tiene implicaciones para la comprensión de la función de la superfamilia más amplia de canales iónicos ligandos pentaméricos.