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1 Anesthesiology, University of Alabama at Birmingham, Birmingham, Alabama, United States
2 Pulmonary, Allergy and Critical Care Medicine, Columbia University, New York, New York, United States
3 Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama, United States
* To whom correspondence should be addressed. E-mail: sadis{at}uab.edu.
Respiratory syncytial virus (RSV) is the most common cause of bronchiolitis in infants and children worldwide. We wished to determine whether intracheal administration of
-agonists improved alveolar fluid clearance (AFC) across the distal respiratory epithelium of RSV infected mice. Following intranasal infection with RSV strain A2, AFC was measured in anesthetized, ventilated BALB/c mice by instillation of 5% BSA into the dependent lung. We found that direct activation of protein kinase A by forskolin or 8-bromo-cAMP increased AFC at day 2 after infection with RSV. In contrast, short- and long-acting
-agonists had no effect at either day 2 or day 4. Insensitivity to
-agonists was not a result of elevated plasma catecholamines, or lung epithelial cell
-adrenergic receptor degradation. Instead, RSV infected mice had significantly higher levels of phosphorylated PKC
in the membrane fractions of their lung epithelial cells. In addition, insensitivity to
-agonists was mediated in a paracrine fashion by KC (the murine homolog of CXCL8) and reversed by inhibition of either PKC
or G protein-coupled receptor kinase 2 (GRK2). These results indicate that insufficient response to
-agonists in RSV may be caused, at least in part, by impaired
-adrenergic receptor signaling, as a consequence of GRK2-mediated uncoupling of
adrenergic receptors from adenylyl cyclase.
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