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Related Concept Videos

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...
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 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...
Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers01:24

Antiarrhythmic Drugs: Class II Agents as β-Adrenergic Blockers

Adrenergic stimulation generally impacts cardiac rate and rhythm. Specifically, stimulation of the β-adrenoceptors triggers an increase in intracellular calcium ion influx and pacemaker currents, which may cause arrhythmias. Catecholamines like adrenaline also demonstrate β2-adrenoceptor-mediated hypokalemia, impacting cardiac action potential and disrupting the normal cardiac rhythm. Class II antiarrhythmic drugs are β-adrenoceptor antagonists or β-blockers, which indirectly block calcium...
Adrenergic Antagonists: ɑ and β-Receptor Blockers01:31

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 clinically...

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Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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Recent developments in A2B adenosine receptor ligands.

Rao V Kalla1, Jeff Zablocki, Mojgan Aghazadeh Tabrizi

  • 1Department of Medicinal Chemistry, CV Therapeutics Inc., Palo Alto, CA 94304, USA. rao.kalla@cvt.com

Handbook of Experimental Pharmacology
|July 30, 2009
PubMed
Summary
This summary is machine-generated.

Selective A(2B) adenosine receptor antagonists are crucial for studying inflammatory and angiogenic diseases. Several new high-affinity compounds show promise for therapeutic development and clinical trials.

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry
  • Drug Discovery

Background:

  • The A(2B) adenosine receptor (AR) plays a role in inflammatory and angiogenic diseases.
  • Early A(2B)AR ligands had suboptimal pharmaceutical properties, necessitating the development of improved compounds.

Purpose of the Study:

  • To identify and develop selective, high-affinity A(2B)AR antagonists as pharmacological tools.
  • To evaluate the therapeutic potential of novel A(2B)AR antagonists in disease models and early clinical trials.

Main Methods:

  • Discovery and synthesis of novel xanthine and pyrimidine derivatives targeting the A(2B)AR.
  • In vitro characterization of receptor binding affinity and selectivity.
  • In vivo assessment of pharmacokinetic properties and efficacy in disease models (e.g., asthma).
  • Phase I clinical trials to evaluate safety and tolerability.

Main Results:

  • Several selective, high-affinity A(2B)AR antagonists were identified, including CVT-6883 (22), MRE2029F20 (30), LAS-38096 (58), and OSIP339391 (54).
  • Compound 22 demonstrated favorable pharmacokinetics, functional antagonism, and efficacy in a mouse asthma model, with good safety in Phase I trials.
  • Compounds 30, 58, and 54 also exhibit high affinity and selectivity for the A(2B)AR and have advanced to further development stages.

Conclusions:

  • The developed A(2B)AR antagonists are valuable pharmacological tools for investigating the receptor's role in disease.
  • These compounds show significant potential for therapeutic applications in inflammatory and angiogenic diseases.
  • Further clinical trials are warranted to establish the efficacy of these A(2B)AR antagonists in various disease states.