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Related Concept Videos

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...
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
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 Antagonists: Pharmacological Actions of β-Receptor Blockers01:27

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

β-receptor blockers significantly impact the cardiovascular system by counteracting catecholamine-induced sympathetic responses. These medications decrease heart rate, contractility, and cardiac output, potentially leading to cardiac depression, life-threatening bradycardia, and death. Therapeutically, β-blockers function as mild antihypertensives and are utilized in treating angina pectoris and cardiac arrhythmias. However, nonselective β-blockers inhibit β2-receptors in bronchial smooth...
Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...

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Internalization dissociates β2-adrenergic receptors.

Tien-Hung Lan1, Sudhakiranmayi Kuravi, Nevin A Lambert

  • 1Department of Pharmacology and Toxicology, Georgia Health Sciences University, Augusta, Georgia, United States of America.

Plos One
|March 3, 2011
PubMed
Summary

G protein-coupled receptors (GPCRs) can dissociate during agonist-induced internalization. This study shows that beta-2 adrenergic receptors (β(2)ARs) break apart during cellular uptake, challenging previous assumptions about receptor stability.

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Area of Science:

  • Cellular Biology
  • Molecular Pharmacology
  • Biochemistry

Background:

  • G protein-coupled receptors (GPCRs) form dimers or oligomers in cells.
  • It is generally believed that associated GPCRs remain intact during trafficking between cellular compartments.

Purpose of the Study:

  • To investigate the stability of self-associating GPCRs, specifically beta-2 adrenergic receptors (β(2)ARs), during agonist-induced internalization.
  • To determine if GPCR dimers or oligomers dissociate during cellular uptake.

Main Methods:

  • Utilized bioluminescence resonance energy transfer (BRET) to monitor β(2)ARs movement between plasma membrane and endosomes.
  • Employed BRET to assess energy transfer between labeled β(2)ARs.
  • Investigated the effects of agonist activation, receptor mutations, and endocytosis inhibitors on BRET signals.

Main Results:

  • Agonist activation led to decreased BRET between β(2)ARs at the plasma membrane and increased BRET with endosome markers.
  • Mutations impairing agonist binding or internalization also reduced BRET between β(2)ARs.
  • Dissociation occurred within 30 minutes, persisted after agonist removal, and was sensitive to endocytosis inhibitors.

Conclusions:

  • β(2)ARs can dissociate during agonist-induced internalization, contradicting the notion of stable receptor complexes.
  • Results suggest that β(2)ARs may associate transiently or that their dimers/oligomers are actively disrupted during internalization.