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Am. J. Respir. Crit. Care Med., Volume 160, Number 6, December 1999, 2062-2066

Bronchoalveolar Lavage Fluid from Asthmatic Subjects Is Mitogenic for Human Airway Smooth Muscle

EDWARD T. NAURECKAS, I. MAURICE NDUKWU, ANDREW J. HALAYKO, CHRISTOPHER MAXWELL, MARC B. HERSHENSON, and JULIAN SOLWAY

Section of Pulmonary and Critical Care Medicine and Department of Pediatrics, The University of Chicago, Chicago, Illinois

Airway smooth muscle proliferation may contribute to the airway wall remodeling seen in asthma. In this study we tested for the presence of airway smooth muscle mitogenic activity in bronchoalveolar lavage (BAL) fluid obtained from 12 atopic asthmatics before and serially after segmental allergen challenge, and from four normal subjects who did not undergo allergen challenge. Mitogenic effect was assessed by coincubating BAL fluid with human airway smooth muscle cells, and measuring its effect on 3[H]thymidine incorporation and cell number. Induction of ERK phosphorylation and cyclin D1 protein abundance were also assessed. Compared with serum-free medium alone, BAL fluid obtained from normal subjects increased thymidine incorporation, cell number, ERK phosphorylation, and cyclin D1 abundance. BAL fluid from asthmatic subjects prior to allergen challenge induced even greater increases in all measures, except for cell number, which was similar to that observed with normal subjects' BAL fluid. Incubation with lavage fluid obtained 48 h after segmental allergen challenge in atopic asthmatics caused yet further increases in thymidine incorporation, cell number, and cyclin D1 protein abundance. Molecular sieving of prechallenge BAL fluid from three asthmatic subjects demonstrated that mitogenic activity was present exclusively in the > 10 kD fraction. These results provide the first direct demonstration that fluid lining the airways of asthmatics contains excess mitogenic activity for human airway smooth muscle, and that this activity increases further after allergen challenge. Naureckas ET, Ndukwu IM, Halayko AJ, Maxwell C, Hershenson MB, Solway J. Bronchoalveolar lavage fluid from asthmatic subjects is mitogenic for human airway smooth muscle.




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