Airway smooth muscle contraction pathway

“Airway smooth muscle contraction pathway" describes the complex signaling events that regulate contraction of airway smooth muscle cells, which modulate airway diameter and airflow resistance. This pathway is activated by agonists such as acetylcholine (via muscarinic receptors), histamine, and leukotrienes, leading to increases in intracellular calcium, activation of myosin light chain kinase, and actin-myosin cross-bridge cycling. Relaxation is mediated by beta-2 adrenergic receptor activation, which increases cyclic AMP. Dysregulation of this pathway underlies diseases such as asthma and chronic obstructive pulmonary disease, where excessive contraction (bronchoconstriction) and airway hyperreactivity occur. While individual components (e.g., muscarinic receptors, beta-2 adrenergic receptors, ion channels) are valid drug targets, the "airway smooth muscle contraction pathway" itself is a functional/process entity, not a single molecular target[1][2][3][4][5]. This entity is not a standardized molecule or receptor, but a catch-all for the interconnected signaling events and effector mechanisms governing airway smooth muscle tone. For structured data, its components should be mapped to the underlying target proteins, such as muscarinic acetylcholine receptors, histamine receptors, Rho kinase, and various ion channels.

Other names

Airway smooth muscle contraction cascadeASM contraction pathwayBronchoconstriction pathway

Relaxation of ASM by increasing cAMP (adrenergic agonists); Inhibition of muscarinic acetylcholine receptors (muscarinic antagonists); Inhibition of calcium influx; Blocking pro-contraction signaling pathways (e.g. Rho kinase, G-protein signaling)