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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.
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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.
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In vitro Measurements of Tracheal Constriction Using Mice
10:20

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Published on: June 25, 2012

DA1 receptors modulation in rat isolated trachea.

Gloria A Cabezas1, Manuel Velasco

  • 1Department of Physiology, Vargas Medical School, Central University of Venezuela, Caracas, Venezuela. gcabezas@cantv.net

American Journal of Therapeutics
|May 25, 2010
PubMed
Summary

Low-dose inhaled dopamine causes bronchodilation via DA1 receptors, not adrenergic receptors, in asthma patients. This study confirms dopamine

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Area of Science:

  • Pharmacology
  • Respiratory Medicine
  • Neuroscience

Background:

  • Inhaled dopamine at low doses induces bronchodilation in acute asthma, suggesting dopaminergic mediation.
  • Previous research indicates dopamine's effect is not mediated by adrenergic receptors.

Purpose of the Study:

  • To investigate the specific dopaminergic and adrenergic receptor subtypes involved in dopamine-induced bronchodilation.
  • To elucidate the mechanism of dopamine's action on airway smooth muscle using rat trachea as a model.

Main Methods:

  • Rat tracheal rings were used in an organ bath to record contractile responses.
  • Contraction was induced by acetylcholine or electric field stimulation, followed by dopamine administration.
  • The effects of beta2-, alpha1-, alpha2-adrenergic, DA1, and DA2 antagonists on dopamine responses were evaluated.

Main Results:

  • Dopamine exhibited a biphasic response: initial contraction followed by marked relaxation, reversing cholinergic contraction.
  • Beta2-, alpha1-, alpha2-adrenergic, and DA2 antagonists did not block dopamine's effects.
  • DA1 antagonist SCH23390 partially inhibited dopamine-induced bronchodilation and increased basal tone, indicating DA1 receptor mediation.

Conclusions:

  • Dopaminergic relaxation in rat trachea is primarily mediated by DA1 receptors, not DA2 receptors.
  • Adrenergic receptors are not involved in dopamine-induced bronchodilation.
  • DA1 antagonist SCH23390 has intrinsic contractile activity on airway smooth muscle, warranting further investigation.