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Related Concept Videos

Sympathetic Signaling01:31

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 Receptors: β Subtype01:26

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...
Adrenergic Receptors (Adrenoceptors): Classification01:27

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 Subtype01:31

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...
Hypothalamic-Pituitary Axis01:37

Hypothalamic-Pituitary Axis

The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
The Sympathetic Nervous System01:25

The Sympathetic Nervous System

Overview

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Related Experiment Video

Updated: Jul 18, 2026

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
06:55

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents

Published on: December 2, 2015

Central alpha1-adrenergic system in behavioral activity and depression.

Eric A Stone1, David Quartermain, Yan Lin

  • 1New York University School of Medicine, Department of Psychiatry, NYU Medical Center, MHL HN510, 550 First Avenue, New York, NY 10016, USA. eric.stone@med.nyu.edu

Biochemical Pharmacology
|November 14, 2006
PubMed
Summary

Central alpha(1)-adrenoceptors modulate behavior, balancing positive activities and stress responses. Antidepressants restore this balance, suggesting a key role in depression.

Related Experiment Videos

Last Updated: Jul 18, 2026

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
06:55

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents

Published on: December 2, 2015

Area of Science:

  • Neuroscience
  • Behavioral Pharmacology
  • Molecular Psychiatry

Background:

  • Central alpha(1)-adrenoceptors are activated by norepinephrine, epinephrine, and dopamine.
  • These receptors influence two opposing behaviors: positive motivation and stress/inhibition.
  • Dysregulation is implicated in depression models.

Purpose of the Study:

  • To investigate the differential activation of alpha(1)-adrenoceptors in positive and stress pathways.
  • To explore the role of endogenous ligands and receptor subtypes in this differential activation.
  • To understand the neural mechanisms underlying depressive behavior.

Main Methods:

  • Utilized brain microinjection studies to map receptor locations.
  • Employed c-fos expression and mitogen-activated protein kinase activation in mouse models of depression.
  • Administered various antidepressant agents to assess their effects.

Main Results:

  • Identified distinct brain regions for positive-linked (e.g., nucleus accumbens) and stress-linked (e.g., amygdala) alpha(1)-receptors.
  • Observed decreased neural activity in positive regions and increased activity in stress regions in depression models.
  • Demonstrated that antidepressant agents attenuate these activity changes.

Conclusions:

  • The balance between positive and stress-related neural networks, mediated by alpha(1)-adrenoceptors, is crucial for behavior.
  • Altered receptor activation patterns in specific brain areas are linked to depressive behaviors.
  • Further research is needed on differential ligand/subtype activation in these systems.