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Related Concept Videos

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 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 Antagonists: Chemistry and Classification of ɑ-Receptor Blockers01:17

Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers

Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline moieties. Phenoxybenzamine, with a haloalkylamine...
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 Antagonists: Pharmacological Actions of ɑ-Receptor Blockers01:22

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, α1-blockers effectively address urinary obstruction...

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Effects of RS17053 on α<sub>1</sub> -adrenoceptors in rat vas deferens and aorta.

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Related Experiment Video

Updated: Jun 19, 2026

Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
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Subtypes of functional alpha1-adrenoceptor.

James R Docherty1

  • 1Department of Physiology, Royal College of Surgeons in Ireland, 123, St. Stephen's Green, Dublin 2, Ireland. docherty@rcsi.ie

Cellular and Molecular Life Sciences : CMLS
|October 29, 2009
PubMed
Summary

This review details alpha1-adrenoceptor subtypes, crucial for smooth muscle contraction, blood pressure, and prostate function. Understanding these G-protein-linked receptors aids in developing targeted therapies.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Physiology

Background:

  • Alpha1-adrenoceptors are G-protein-linked cell membrane receptors activated by noradrenaline.
  • They are key mediators of physiological responses, particularly smooth muscle contraction.

Purpose of the Study:

  • To review the subtypes of functional alpha1-adrenoceptors.
  • To discuss their roles in physiological processes and the impact of subtype-specific research.

Main Methods:

  • Review of existing literature on alpha1-adrenoceptor subtypes.
  • Analysis of data from alpha1-adrenoceptor subtype knock-out mice studies.

Main Results:

  • Identified alpha1A-, alpha1B-, and alpha1D-adrenoceptor subtypes, plus the alpha1L-phenotype.

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  • Confirmed their role in mediating contractile responses via Gq/11 and inositol phosphate turnover.
  • Highlighted their involvement in vascular smooth muscle contraction, blood pressure, temperature regulation, and urogenital functions.

    • Conclusions:

    • Alpha1-adrenoceptor subtypes play critical roles in smooth muscle contraction and physiological regulation.
    • Knock-out mouse models have significantly advanced the understanding of these receptor subtypes.
    • Further research is ongoing to elucidate central actions and develop subtype-selective drugs.