Search results
Results from the Go Local Guru Content Network
The beta-1 adrenergic receptor (β 1 adrenoceptor), also known as ADRB1, can refer to either the protein-encoding gene (gene ADRB1) or one of the four adrenergic receptors. [5] It is a G-protein coupled receptor associated with the Gs heterotrimeric G-protein that is expressed predominantly in cardiac tissue.
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.
Beta-1 adrenergic receptors are the primary receptor of the heart and, therefore, autoantibodies to these receptors have been tied to many different heart diseases. Autoantibodies to beta1-adrenergic receptors are linked to chronic heart failure.
The cellphone-friendly website and "MYmta" app, currently in a beta test phase, show straphangers real-time subway, bus and commuter rail information that has been housed in separate apps.
Activation of β 2 receptors induces smooth muscle relaxation in the lungs, gastrointestinal tract, uterus, and various blood vessels. Increased heart rate and heart muscle contraction are associated with the β1 receptors; however, β 2 cause vasodilation in the myocardium.
Beta1-adrenergic agonists, also known as Beta1-adrenergic receptor agonists, are a class of drugs that bind selectively to the beta-1 adrenergic receptor. As a result, they act more selectively upon the heart.
Metoprolol blocks β 1-adrenergic receptors in heart muscle cells, thereby decreasing the slope of phase 4 in the nodal action potential (reducing Na + uptake) and prolonging repolarization of phase 3 (slowing down K + release).
Beta blockers are competitive antagonists that block the receptor sites for the endogenous catecholamines epinephrine (adrenaline) and norepinephrine (noradrenaline) on adrenergic beta receptors, of the sympathetic nervous system, which mediates the fight-or-flight response.
Alpha-1 blockers (also called alpha-adrenergic blocking agents or alpha-1 antagonists) constitute a variety of drugs that block the effect of catecholamines on alpha-1-adrenergic receptors. They are mainly used to treat benign prostatic hyperplasia (BPH), hypertension and post-traumatic stress disorder. [1]
This page was last edited on 1 December 2007, at 08:14 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply.