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Adrenergic Neurons: Neurotransmission

Adrenergic Neurons: Neurotransmission

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.
Synthesis: Catecholamine synthesis requires tyrosine, which...

Adrenergic Agonists: Indirect-Acting Agents

Adrenergic Agonists: Indirect-Acting Agents

Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...

Drugs Affecting Neurotransmitter Release or Uptake

Drugs Affecting Neurotransmitter Release or Uptake

Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...

Drugs Affecting Neurotransmitter Synthesis

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...

Sympathetic Signaling

Sympathetic Signaling

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.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...

Adrenergic Agonists: Mixed-Action Agents

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...

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Related Experiment Video

Updated: Apr 6, 2026

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area

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Published on: August 10, 2012

Noradrenaline and dopamine: sharing the Workload.

Stan B Floresco¹

¹Department of Psychology and Brain Research Centre, University of British Columbia, 2136 West Mall, Vancouver, BC, V6T 1Z4, CANADA.

Trends in Neurosciences

|July 18, 2015

Summary

Noradrenergic and dopaminergic neural activity influence cost/benefit decisions. Dopamine signals reward value, while noradrenergic cells adjust for required effort, showing complementary roles in decision-making.

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Last Updated: Apr 6, 2026

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area

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Published on: August 10, 2012

Presynaptic Dopamine Dynamics in Striatal Brain Slices with Fast-scan Cyclic Voltammetry

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Published on: January 12, 2012

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Published on: August 11, 2021

Area of Science:

Neuroscience
Decision-making research
Behavioral economics

Background:

Understanding the neural basis of decision-making is crucial.
Effort-based decisions involve complex computations balancing potential rewards against costs.

Purpose of the Study:

To investigate the distinct roles of noradrenergic and dopaminergic systems in cost/benefit decisions.
To elucidate how these neurotransmitter systems interact to guide choices involving effort.

Main Methods:

Electrophysiological recordings in animal models.
Behavioral tasks assessing cost/benefit trade-offs.
Pharmacological manipulations of neural pathways.

Main Results:

Dopaminergic activity encodes the value of rewards, adjusted for the cost of obtaining them.
Noradrenergic activity modulates neural responses based on the magnitude of effort required.
Evidence suggests complementary, rather than overlapping, functions of these systems.

Conclusions:

Noradrenergic and dopaminergic systems play distinct, complementary roles in effort-based decision-making.
Dopamine prioritizes reward valuation, while noradrenaline signals the cost of effort.
These findings provide insights into the neural mechanisms underlying complex choices.