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Related Concept Videos

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...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
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...
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...
Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...

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Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
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Adrenergic Receptors From Molecular Structure to in vivo function.

L Hein1, B K Kobilka

  • 1Division of Cardiovascular Medicine, Stanford University Medical School, Stanford, CA 94305, USA; Department of Pharmacology, University of Wuerzburg, Wuerzburg, Germany.

Trends in Cardiovascular Medicine
|January 18, 2011
PubMed
Summary

This review details recent advances in adrenergic receptor molecular structure, function, and regulation. It integrates in vitro studies with transgenic animal models for comprehensive in vivo insights.

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Area of Science:

  • Cardiovascular Medicine
  • Endocrinology
  • Neuroscience

Background:

  • Adrenergic receptors are key mediators between the sympathetic nervous system and cardiovascular, endocrine, and parenchymal tissues.
  • They are extensively studied G-protein-coupled receptors, alongside rhodopsin.
  • Understanding their role is crucial for numerous physiological processes.

Purpose of the Study:

  • To review recent molecular and functional insights into adrenergic receptors.
  • To integrate findings from in vitro systems with in vivo data from transgenic models.
  • To provide a comprehensive overview of adrenergic receptor research.

Main Methods:

  • Review of current literature on adrenergic receptor research.
  • Analysis of in vitro experimental systems.
  • Integration of data from transgenic animal models studying the adrenergic system in vivo.

Main Results:

  • Recent advances have elucidated the molecular structure of adrenergic receptors.
  • New understanding of their function and regulation has emerged from in vitro studies.
  • Transgenic animal models offer valuable in vivo perspectives on adrenergic system activity.

Conclusions:

  • Adrenergic receptors are critical components of the sympathetic nervous system.
  • Combined in vitro and in vivo approaches provide a deeper understanding of their complex roles.
  • Continued research is essential for further unraveling their physiological and pathological significance.