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Published ahead of print on October 20, 2005, doi:10.1165/rcmb.2005-0332OC

Am. J. Respir. Cell Mol. Biol., Volume 34, Number 2, February 2006, 151-157

A more recent version of this article appeared on February 1, 2006
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Submitted on August 30, 2005
Revised on October 19, 2005

Transdifferentiation of Ciliated Cells During Repair of the Respiratory Epithelium

Kwon-Sik Park1, James M Wells2, Aaron M Zorn2, Susan E Wert1, Victor E Laubach3, Lucas G Fernandez3, and Jeffrey A Whitsett1*

1 Division of Pulmonary Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA, 2 Division of Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA, 3 Department of Surgery, University of Virginia Health System, Charlottesville, VA, USA

* To whom correspondence should be addressed. E-mail: jeff.whitsett{at}cchmc.org.

Since the lung is repeatedly subjected to injury by pathogens and toxicants, maintenance of pulmonary homeostasis requires rapid repair of its epithelial surfaces. Ciliated bronchiolar epithelial cells, previously considered as terminally differentiated, underwent squamous cell metaplasia within hours after bronchiolar injury with naphthalene. Expression of transcription factors active in morphogenesis and differentiation of the embryonic lung, including {beta}-catenin, Foxa2, Foxj1, and Sox family members (Sox17 and Sox2) was dynamically regulated during repair and redifferentiation of the bronchiolar epithelium following naphthalene injury. Squamous cells derived from ciliated cells spread beneath injured Clara cells within 6-12 hours after injury, maintaining the integrity of the epithelium. Dynamic changes in cell shape and gene expression, indicating cell plasticity, accompanied the transition from squamous to cuboidal to columnar cell types as differentiation-specific cell markers typical of the mature airway were restored. Similar dynamic changes in the expression of these transcription factors occurred in ciliated and Clara cells during regeneration of the lung following unilateral pneumonectomy. Taken together, these findings demonstrate that ciliated epithelial cells spread and transdifferentiate into distinct epithelial cell types to repair the airway epithelium.




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