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The beta-2 adrenergic receptor (β 2 adrenoreceptor), also known as ADRB2, is a cell membrane-spanning beta-adrenergic receptor that binds epinephrine (adrenaline), a hormone and neurotransmitter whose signaling, via adenylate cyclase stimulation through trimeric G s proteins, increases cAMP, and, via downstream L-type calcium channel ...
Beta2-adrenergic agonists, also known as adrenergic β2 receptor agonists, are a class of drugs that act on the β 2 adrenergic receptor. Like other β adrenergic agonists, they cause smooth muscle relaxation. β 2 adrenergic agonists' effects on smooth muscle cause dilation of bronchial passages, vasodilation in muscle and liver, relaxation of ...
Beta blockers are known primarily for their reductive effect on heart rate, although this is not the only mechanism of action of importance in congestive heart failure. Beta blockers, in addition to their sympatholytic β 1 activity in the heart, influence the renin–angiotensin system at the kidneys.
Although minor compared to those of epinephrine, beta agonists usually have mild to moderate adverse effects, which include anxiety, hypertension, increased heart rate, and insomnia. Other side effects include headaches and essential tremor .
Adrenergic receptor. β 2 adrenoceptor ( PDB: 2rh1 ) shown binding carazolol (yellow) on its extracellular site. β 2 stimulates cells to increase energy production and utilization. The membrane the receptor is bound to in cells is shown with a gray stripe.
Salbutamol and other β 2 receptor agonists also increase the conductance of channels sensitive to calcium and potassium ions, leading to hyperpolarization and relaxation of bronchial smooth muscles. [24]
An adrenergic antagonist is a drug that inhibits the function of adrenergic receptors. There are five adrenergic receptors, which are divided into two groups. The first group of receptors are the beta (β) adrenergic receptors. There are β 1, β 2, and β 3 receptors.
A Beta-2 adrenergic antagonist (β 2 -adrenoceptor antagonist) is an adrenergic antagonist which blocks the beta-2 adrenergic receptors of cells, with either high specificity (an antagonist which is selective for β 2 adrenoceptors) like Butaxamine and ICI-118,551, or non-specifically (an antagonist for β 2 and for β 1 or β 3 adrenoceptors ...
Direct stimulation of the α- and β-adrenergic receptors can produce sympathomimetic effects. Salbutamol is a widely used direct-acting β 2-agonist. Other examples include phenylephrine, isoproterenol, and dobutamine. Dopaminergic agonists
The blocking of β 2 receptor promotes vascular smooth muscle contraction, which results in increase of peripheral resistance. Blockade of the β 2 receptor effectively reduces the sympathetic activity, which results in reduce of the associated platelet-and coagulation activation.