Long-acting β₂ agonist (LABA) with a long-acting muscarinic receptor antagonist (LAMA) promotes human airway smooth muscle (HASM) relaxation and circumvents β₂ adrenergic receptor tachyphylaxis.

ABSTRACT: To fill the gap in the knowledge between clinical studies and pre-clinical mechanistic studies using combined LABA/LAMA therapy, we hypothesized that the combination is more effective in attenuating excitation-contraction (E-C) coupling compared to either LAMA or LABA alone in human airway smooth muscle (HASM) cells. In primary HASM and human precision-cut lung slices (hPCLS) obtained from non-diseased donors, we show that the combination of umeclidinium (LAMA) and vilanterol (LABA) robustly attenuated carbachol-induced E-C coupling markers, compared to that induced by either compound individually. The effective concentrations of umeclidinium or vilanterol that attenuated E-C coupling signaling events were significantly decreased when the agents were combined as compared to dosing of eithe

SUBMITTER: Jude J 

PROVIDER: S-EPMC12781414 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature