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Mediators of Inflammation
Volume 9, Issue 6, Pages 277-284

ATP induced MUC5AC release from human airways in vitro

1Laboratoire de Pharmacologie Pulmonaire CNRS ESA 8078, paris, France
2Laboratoire d'Anatomo-pathologie, Hôpital Marie Lannelongue, 133 Av de la Résistance, Le Plessis Robinson, 92350, France
3INSERM U 482, Hôpital Saint Antoine, 184 rue du Faubourg Saint Antoine, Paris 75012, France
4Discovery Biology II, Central Research Division, Pfizer Limited, Sandwich, Kent, CT13 9NJ, UK

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Background: Chronic airway diseases are often associated with marked mucus production, however, little is known about the regulation of secretory activity by locally released endogenous mediators.

Aim: This investigation was performed to determine the release of MUC5AC mucin from human bronchial preparations using the purinergic agonists adenosine 5'-triphosphate (ATP) and uridine 5'-triphosphate (UTP).

Methods: Immunohistochemical and immunoradiometric assays (IRMA) were used to detect the MUC5AC mucin. Immunohistochemical analysis were performed using individual 1–13 M1 and 21 M1 MAbs recognizing a recombinant M1 mucin partially encoded by the MUC5AC gene. IRMA measurments were performed using a mixture of eight anti-M1 mucin MAbs (PM8), which included both 1–13 M1 and 21 M1 MAbs. Lysozyme and protein were also measured in the biological fluids derived from human bronchial preparations obtained from patients who had undergone surgery for lung carcinoma.

Results: The anti-M1 monoclonal antibodies labelled epithelial goblet cells. After challenge of human bronchial preparations with ATP, the goblet cells exhibited less staining. In contrast, UTP did not alter the immunolabelling of goblet cells. MUC5AC mucin in the bronchial fluids derived from ATP-ch allenged preparations was increased while UTP had no effect on release. ATP did not alter either the quantities of lysozyme or protein detected in the biological fluids.

Conclusion: These results suggest that ATP may regulate epithelial goblet cell secretion of MUC5AC mucin from human airways in vitro.