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. 1989 Dec;98(4):1197–1206. doi: 10.1111/j.1476-5381.1989.tb12665.x

Receptors mediating the effects of substance P and neurokinin A on mucus secretion and smooth muscle tone of the ferret trachea: potentiation by an enkephalinase inhibitor.

S E Webber 1
PMCID: PMC1854793  PMID: 2482101

Abstract

1. The effects of substance P (SP) and neurokinin A (NKA) were examined on tracheal smooth muscle tone, mucus volume output, lysozyme output and albumin transport across the ferret in vitro whole trachea in the presence and absence of the enkephalinase inhibitor, thiorphan. 2. SP (0.001-3 microM) and NKA (0.01-10 microM) contracted the tracheal smooth muscle and increased mucus volume, lysozyme and albumin outputs into the tracheal lumen. The EC50 values for SP and NKA for all of the variables measured were significantly reduced, and all of the maximum responses were significantly enhanced by thiorphan (10 microM). 3. In the presence of thiorphan, SP (1 microM) and NKA (10 microM) produced albumin concentrations in the secreted mucus (8.9 and 7.2 micrograms microliters-1) which were greater than those in the submucosal buffer (4.2 micrograms microliters-1). 4. In the presence of thiorphan, NKA was approximately 5 times more potent than SP at contracting the tracheal smooth muscle. Conversely SP was 23, 15 and 22 times more potent than NKA at stimulating mucus volume, lysozyme and albumin outputs respectively. 5. Thus, there is neutral endopeptidase in the ferret trachea in vitro which cleaves exogenously applied SP and NKA, thereby reducing the magnitude and potency of their actions. SP and NKA contract the ferret tracheal muscle probably by an action at NK2 (or NK3)-receptors but stimulate mucus volume output, lysozyme output and albumin transport across the tracheal wall probably by an action on NK1 receptors.

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Selected References

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