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Adrenergic Receptors (Adrenoceptors): Classification

Adrenergic Receptors (Adrenoceptors): Classification

Adrenergic receptors, or adrenoceptors, respond to the autonomic neurotransmitter noradrenaline and other endogenous catecholamine agonists. They are classified into two main families, α and β, based on their pharmacological response and are further subdivided depending on their location, elicited response, and affinity to specific agonists or antagonists.
α-Adrenoceptors
α-Adrenoceptors are classified into two main subtypes: α1 and α2. The α1 adrenoceptors, which are found on postsynaptic...

Adrenergic Receptors: ɑ Subtype

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...

Adrenergic Receptors: β Subtype

Adrenergic Receptors: β Subtype

β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors have equal affinities for...

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...

Intracellular Signaling Affects Focal Adhesions

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...

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 is taken...

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Related Experiment Video

Updated: May 20, 2026

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons

Published on: April 20, 2018

Alpha2-adrenergic receptor activation regulates cortical interneuron migration.

Orbicia Riccio¹, Nicolas Hurni, Sahana Murthy

¹Department of Mental Health and Psychiatry, University of Geneva Medical School, Geneva, Switzerland.

The European Journal of Neuroscience

|July 19, 2012

Summary

Noradrenaline influences embryonic brain development by regulating cortical interneuron migration via alpha2 adrenergic receptors (adra2). Adrenergic system dysregulation can disrupt cortical circuit formation.

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Last Updated: May 20, 2026

Ex Utero Electroporation and Organotypic Slice Cultures of Embryonic Mouse Brains for Live-Imaging of Migrating GABAergic Interneurons

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Area of Science:

Neuroscience
Developmental Biology
Neurodevelopment

Background:

Monoamines like serotonin and dopamine regulate cortical interneuron migration.
The role of noradrenaline in this process is largely unknown.
Adrenergic receptors are present during embryonic development in areas with migrating neurons.

Purpose of the Study:

Investigate noradrenaline's role in embryonic cortical interneuron migration.
Determine the expression of adrenergic receptors in specific interneuron subtypes.
Examine the functional impact of adrenergic receptor activation on interneuron migration.

Main Methods:

Examined adrenergic receptor expression in mouse cortical interneuron subtypes.
Utilized time-lapse recordings in cortical slices to monitor migration.
Analyzed in vivo distribution of interneurons in knockout mouse models.

Main Results:

Cortical interneurons express various adrenergic receptor subtypes.
Activation of alpha2 adrenergic receptors (adra2) inhibits interneuron migration concentration-dependently.
adra2 activation alters interneuron migration directionality and affects in vivo distribution.

Conclusions:

The adrenergic system, particularly adra2, plays a significant role in regulating cortical interneuron migration.
Dysregulation of the adrenergic system during embryonic development can impair cortical circuit formation.
adra2 stimulation may modulate interneuron responsiveness to guidance cues.