Anti-inflammatory effects of β2 adrenergic receptor agonists in experimental acute lung injury

These studies were undertaken to extend emerging evidence that beta(2) adrenergic receptor (beta(2)AR) agonists, in addition to their bronchorelaxing effects, may have broad anti-inflammatory effects in the lung following onset of experimental acute lung injury (ALI). Young male C57BL/6 mice (25 g) developed ALI following airway deposition of bacterial LPS or IgG immune complexes in the absence or presence of appropriate stereoisomers (enantiomers) of beta(2)AR agonists, albuterol or formoterol. Endpoints included albumin leak into lung and buildup of polymorphonuclear neutrophils and cytokines/chemokines in bronchoalveolar fluids. Both beta(2)AR agonists suppressed lung inflammatory parameters (IC50=10(-7) M). Similar effects of beta(2)AR agonists on mediator release were found when mouse macrophages were stimulated in vitro with LPS. The protective effects were associated with reduced activation (phosphorylation) of JNK but not of other signaling proteins. Collectively, these data suggest that beta(2)AR agonists have broad anti-inflammatory effects in the setting of ALI. While beta(2)AR agonists suppress JNK activation, the extent to which this can explain the blunted lung inflammatory responses in the ALI models remains to be determined.-Bosmann, M., Grailer, J. J., Zhu, K., Matthay, M A., Vidya Sarma, J., Zetoune, F. S., Ward, P. A. Anti-inflammatory effects of beta(2) adrenergic receptor agonists in experimental acute lung injury. FASEB J. 26, 2137-2144 (2012). www.fasebj.org