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The Journal of Clinical Investigation logoLink to The Journal of Clinical Investigation
. 1990 Sep;86(3):838–844. doi: 10.1172/JCI114782

Increased pulmonary neuroendocrine cells with bombesin-like immunoreactivity in adult patients with eosinophilic granuloma.

S M Aguayo 1, T E King Jr 1, J A Waldron Jr 1, K M Sherritt 1, M A Kane 1, Y E Miller 1
PMCID: PMC296800  PMID: 2394833

Abstract

Cigarette smoking is associated with hyperplasia of pulmonary neuroendocrine cells and variably increased levels of bombesin-like peptides in the lower respiratory tract. Because the neuropeptide bombesin is a chemoattractant for monocytes and a mitogen for 3T3 fibroblasts, we hypothesized that an excess of neuroendocrine cells and bombesin-like peptides could contribute to lung inflammation and fibrosis in certain cigarette smokers. Eosinophilic granuloma is a fibrotic lung disease of unknown etiology that in adults occurs almost invariably in cigarette smokers. We quantitated neuroendocrine cells with bombesin-like immunoreactivity in open lung biopsies from patients with eosinophilic granuloma (n = 6) and compared these with cigarette smokers (n = 6) who underwent lung resection for reasons other than primary lung disease. In addition, we compared them with patients with idiopathic pulmonary fibrosis (n = 8), a disease not associated with cigarette smoking. Finally, we also examined the mitogenic effect of bombesin on cultured human adult lung fibroblasts. The patients with eosinophilic granuloma exhibited a 10-fold increase in neuroendocrine cells with bombesin-like immunoreactivity compared to both smokers (P = 0.005) and patients with idiopathic pulmonary fibrosis (P = 0.005). In addition, bombesin produced a significant mitogenic effect on cultured human adult lung fibroblasts at concentrations of 1 nM and above. We conclude that increased numbers of pulmonary neuroendocrine cells with bombesin-like immunoreactivity are commonly found in patients with eosinophilic granuloma and, since bombesin-like peptides are chemotactic for monocytes and mitogenic for human lung fibroblasts, we speculate that neuroendocrine cell hyperplasia may be important in the pathogenesis of eosinophilic granuloma in adult cigarette smokers.

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Selected References

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