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Adrenergic Receptors (Adrenoceptors): Classification01:27

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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.
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Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
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β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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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.
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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
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Paradigms for Pharmacological Characterization of C. elegans Synaptic Transmission Mutants
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Catecholamine receptor polymorphisms affect decision-making in C. elegans.

Andres Bendesky1, Makoto Tsunozaki, Matthew V Rockman

  • 1Howard Hughes Medical Institute, Laboratory of Neural Circuits and Behavior, The Rockefeller University, New York, New York 10065, USA.

Nature
|March 18, 2011
PubMed
Summary
This summary is machine-generated.

Flexible foraging behaviors, like patch leaving in Caenorhabditis elegans, are genetically influenced. Naturally occurring tyramine receptor 3 (tyra-3) gene variations impact this decision, revealing ancient roles for catecholamines in behavior.

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Area of Science:

  • Neuroscience
  • Genetics
  • Behavioral Biology

Background:

  • Innate behaviors exhibit flexibility, adapting to environmental changes and genomic modifications.
  • The exploration-exploitation decision, crucial for foraging animals, involves choosing when to leave a depleting food source.

Purpose of the Study:

  • To investigate the genetic basis of the decision to leave a food patch in the nematode Caenorhabditis elegans.
  • To identify specific genes and genetic variations influencing this foraging behavior.

Main Methods:

  • Quantitative genetic analysis was employed to study patch-leaving behavior.
  • Focus was placed on naturally occurring non-coding polymorphisms in the tyra-3 gene.

Main Results:

  • Patch-leaving behavior in Caenorhabditis elegans is a complex, multigenic trait.
  • Naturally occurring polymorphisms in tyra-3, encoding tyramine receptor 3, partially regulate this behavior.
  • tyra-3 functions within sensory neurons, indicating a role for internal catecholamines in processing external cues.

Conclusions:

  • Genetic variation and environmental cues converge on shared neural circuits to regulate behavior.
  • Catecholamines play a conserved, ancient role in mediating behavioral decisions, particularly in foraging contexts.