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Cholinergic Receptors: Muscarinic01:25

Cholinergic Receptors: Muscarinic

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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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Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
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Cholinergic Receptors: Nicotinic01:15

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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.
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Adrenergic Neurons: Neurotransmission01:27

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Postganglionic sympathetic fibers (except those supplying the sweat glands) releasing noradrenaline or norepinephrine are called noradrenergic or adrenergic neurons. Noradrenaline, dopamine, adrenaline, or epinephrine are collectively called "catecholamines" as they contain a catechol moiety and an amine side chain. The five stages of neurotransmitter release involve their synthesis, storage, release, reuptake and metabolism.
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The sympathetic pathways of the collateral ganglia and adrenal medulla serve unique but interconnected roles in the sympathetic response.
Collateral Ganglia
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Cholinesterases: Distribution and Function01:22

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Cholinesterases are a group of serine hydrolase enzymes that play a crucial role in the breakdown of choline esters. The two primary types of cholinesterases are acetylcholinesterases (AChEs) and butyrylcholinesterase (BuChEs), which differ in their distribution, function, and substrate specificity. AChEs, also known as true cholinesterases, specifically hydrolyze acetylcholine, while BuChEs, often referred to as pseudocholinesterases, can hydrolyze various choline esters, including...
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Aplysia Ganglia Preparation for Electrophysiological and Molecular Analyses of Single Neurons
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Catecholamine-Containing Cells in Larval and Postlarval Bivalve Molluscs.

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    This study visualizes catecholamines in bivalve larvae, revealing neural circuits involved in behaviors like feeding and metamorphosis. These findings map key neuronal pathways in Pectinidae and Mytilidae development.

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    Area of Science:

    • Marine Biology
    • Neuroscience
    • Developmental Biology

    Background:

    • Catecholamines are implicated in regulating crucial bivalve larval behaviors.
    • Previous research relied on indirect evidence like chromatography.

    Purpose of the Study:

    • To visualize and map catecholamine distribution in bivalve larvae.
    • To identify potential neuronal circuits controlling larval behaviors.

    Main Methods:

    • Aldehyde-induced fluorescence to detect catecholamines.
    • Examination of Pectinidae (Placopecten magellanicus) and Mytilidae (Mytilus edulis) larvae at various developmental stages.
    • Control labeling with anti-serotonin antibodies.

    Main Results:

    • Consistent distribution of fluorescent cells across species and developmental stages.
    • Identification of catecholaminergic cells and fibers in velar lobes, around the mouth, foot, and mantle.
    • Post-settlement, foot and gill catecholaminergic cells persist and connect to ganglia.

    Conclusions:

    • Confirms the presence of catecholamines in bivalve larvae.
    • Identifies specific catecholaminergic neuronal populations and potential circuits.
    • Provides a foundation for understanding the neurobiology of bivalve larval development and behavior.