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Related Concept Videos

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. 
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Chemical Synapses01:26

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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
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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.
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Memory-Relevant Mushroom Body Output Synapses Are Cholinergic.

Oliver Barnstedt1, David Owald1, Johannes Felsenberg1

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In fruit flies, acetylcholine (ACh) plays a crucial role in olfactory memory. This study reveals that cholinergic synapses in the mushroom body are key to storing these learned scent memories.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Animal Behavior

Background:

  • Memories are stored in neural circuits like the mammalian cerebellum and insect mushroom bodies.
  • While mammalian memory relies on glutamatergic plasticity, the neurochemistry of insect memory synapses is largely unknown.

Purpose of the Study:

  • To investigate the neurochemistry of memory storage at Kenyon cell output synapses in Drosophila melanogaster.
  • To determine the role of acetylcholine (ACh) in olfactory memory formation and recall.

Main Methods:

  • Examined expression of ACh-processing proteins (ChAT, VAChT) in Kenyon cells.
  • Assessed the impact of reducing ChAT and VAChT expression on olfactory learning.
  • Measured mushroom body output neuron (MBON) activity following ACh application or Kenyon cell activation.
  • Investigated the role of ACh receptors and peptidergic corelease in MBON activation and behavior.

Main Results:

  • Kenyon cells express ChAT and VAChT; their reduced expression impairs learned olfactory behavior.
  • ACh application or Kenyon cell activation triggers MBON activity, dependent on VAChT and blocked by ACh receptor antagonists.
  • Reduced nicotinic ACh receptor expression in MBONs disrupts odor-evoked activation and alters odor-driven behavior.
  • Peptidergic corelease modulates ACh-evoked MBON responses, indicating transmitter interactions.

Conclusions:

  • Olfactory memories in Drosophila are likely stored through plasticity at cholinergic synapses.
  • Acetylcholine is a key neurotransmitter involved in insect olfactory memory processing.
  • This research elucidates the neurochemical basis of memory in insect brains.