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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,...

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...

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...

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Adrenergic Antagonists: ɑ and β-Receptor Blockers

Third-generation β-blockers, such as labetalol and carvedilol, represent a significant advancement in managing cardiovascular conditions. Unlike conventional β-blockers, which can induce peripheral vasoconstriction, third-generation drugs block α1 adrenoceptors. This promotes vasodilation through several mechanisms, such as increased nitric oxide production, inhibition of calcium ion entry, opening of potassium ion channels, and antioxidant action. Labetalol, for instance, is...

Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers

Adrenergic Antagonists: Pharmacological Actions of ɑ-Receptor Blockers

α-Adrenergic antagonists, known as α-blockers, exert their effects by inhibiting α-adrenoceptors, leading to specific physiological actions. α1-blockers and α2-blockers have distinct pharmacological actions and therapeutic applications.
α1-blockers: These drugs inhibit α1-adrenoceptors on smooth muscle cells, resulting in vasodilation. This vasodilation lowers blood pressure, making α1-blockers valuable in treating hypertension. Additionally,...

Adrenergic Antagonists: Pharmacological Actions of β-Receptor Blockers

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...

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Related Experiment Video

Updated: Feb 7, 2026

A Method to Study the C924T Polymorphism of the Thromboxane A2 Receptor Gene

A Method to Study the C924T Polymorphism of the Thromboxane A2 Receptor Gene

Published on: April 1, 2019

[Beta 2-Adrenergic receptor gene polymorphisms].

¹Department of Pulmonary Medicine, School of Medicine, Fukushima Medical University.

Nihon Rinsho. Japanese Journal of Clinical Medicine

|October 26, 2001

Summary

This summary is machine-generated.

The beta 2-adrenergic receptor gene, crucial for asthma, has several known genetic variations. Understanding these polymorphisms offers insights into asthma

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Area of Science:

Genetics
Pharmacogenetics
Molecular Biology

Context:

The beta 2-adrenergic receptor (ADRB2) gene is located on chromosome 5q31-33, a region associated with asthma susceptibility.
Numerous polymorphisms exist within the ADRB2 gene's coding and promoter regions, some with functional implications.

Purpose:

To review current knowledge on ADRB2 gene polymorphisms.
To discuss the pathophysiological and pharmacogenetic relevance of these variations in asthma.

Summary:

The ADRB2 gene, an intronless gene encoding 413 amino acids, is a key focus in asthma research.
Over 19 polymorphisms have been identified in the coding and 5' promoter regions of the ADRB2 gene.
Several ADRB2 polymorphisms demonstrate functional significance, impacting asthma pathophysiology and treatment response.

Impact:

Provides a comprehensive overview of ADRB2 gene variations in relation to asthma.
Highlights the importance of pharmacogenetics in understanding individual responses to asthma therapies.
Suggests future research directions for ADRB2 gene polymorphism studies in asthma.