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Journal of Histochemistry and Cytochemistry, Vol. 49, 1301-1310, October 2001, Copyright © 2001, The Histochemical Society, Inc.

ARTICLE

Immunohistochemical Mapping of Endothelin in the Developing and Adult Mouse Lung

Laura Guembea and Ana C. Villaroa
a Department of Histology and Pathology, University of Navarra, Pamplona, Spain

Correspondence to: Laura Guembe, Dept. of Histology and Pathology, University of Navarra, 31080 Pamplona, Spain. E-mail: lguembe@unav.es

Endothelins (ET) are a family of regulatory peptides displaying, among other abilities, potent constrictor actions. We studied the perinatal time course expression and distribution of ET in the mouse airway epithelium. In fetal mouse, ET-immunoreactivity (IR) appeared earlier (gestational Day 18) in the epithelium of upper (bronchi and large bronchioles) than in lower airways, being scarce and mainly located in the apical cytoplasm. As the lung developed, ET-IR became gradually stronger and extended throughout the cell in both bronchi and bronchioles. ET-IR was found in most airway epithelial cells. Clara cells were positive for ET, whereas ciliated and endocrine cells were not. In adult lungs, part of the myocytes and parenchymal cells also showed ET-IR. In both developing and adult mouse lungs, the cell distribution of ET-IR in the epithelium is compatible with apical and/or basal secretion. The presence of ET in mouse airway epithelium during the perinatal period may indicate a role for ET as a growth factor in lung development and its involvement in control of lung ventilation at birth. (J Histochem Cytochem 49:1301–1309, 2001)

Key Words: mouse lung, development, endothelin, Clara cells, smooth muscle, parenchymal cells


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