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RATIONALE Airway nitric oxide concentrations are reduced in cystic fibrosis (CF). Arginases compete for L-arginine, the substrate of nitric oxide synthesis. OBJECTIVES We hypothesized that increased arginase activity may be one factor contributing to nitric oxide deficiency in CF. MEASUREMENTS We therefore studied sputum arginase activity, exhaled(More)
In the respiratory tract acetylcholine is neurotransmitter in ganglia and postganglionic parasympathetic nerves, but in addition is paracrine mediator released from various non-neuronal cells. Almost every cell type present in the respiratory tract expresses nicotinic and muscarinic receptors and therefore appears to be a target for acetylcholine. The(More)
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