NCIt definition : The sulfate salt form of isoproterenol, a beta-adrenergic receptor agonist with bronchodilator
activity. Isoproterenol binds to beta-2 adrenergic receptors in bronchial smooth muscle,
thereby activating intracellular adenyl cyclase, an enzyme that catalyzes the conversion
of adenosine triphosphate (ATP) to cyclic-3',5'-adenosine monophosphate (cAMP). Increased
cAMP levels cause relaxation of bronchial smooth muscle, relieve bronchospasms, improve
mucociliary clearance and inhibit the release of mediators of immediate hypersensitivity
from cells, especially from mast cells.;