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Published ahead of print on August 21, 2003, doi:10.1165/rcmb.2003-0264OC

Am. J. Respir. Cell Mol. Biol., Volume 30, Number 3, March 2004, 288-295

A more recent version of this article appeared on March 1, 2004
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Submitted on July 16, 2003
Revised on August 20, 2003

Rab3D and actin reveal distinct lamellar body subpopulations in alveolar epithelial type II cells

Laura van Weeren1, Anko M de Graaff1, James D Jamieson2, Joseph J Batenburg1, and Jack A Valentijn1*

1 Biochemistry and Cell Biology, University of Utrecht, Faculty of Veterinary Medicine, Utrecht, The Netherlands, 2 Cell Biology, Yale University School of Medicine, New Haven, CT, USA

* To whom correspondence should be addressed. E-mail: j.a.valentijn{at}vet.uu.nl.

Rab3D is a small GTP-binding protein associated with secretory vesicles in various exocrine and endocrine cells, where it has been implicated in regulated exocytosis. Data obtained previously in pancreas have suggested that rab3D is involved in the coating of secretory granules with filamentous actin. In the present study we employed Western blot analysis, immunofluorescence and immunoelectron microscopy to examine the distribution of rab3D in rat lung. Rab3D immunoreactivity was detected in bronchiolar Clara cells and alveolar epithelial type II (AET-II) cells. In both cell types, rab3D displayed preferential localization to secretory vesicles that were identified using specific antibodies against Clara Cell Secretory Protein and p180 lamellar body protein, respectively. Interestingly, rab3D was associated with only 24% of the lamellar bodies in AET-II cells. Rab3D-positive lamellar bodies were typically in close proximity of the apical plasma membrane where exocytosis occurs. Another subpopulation of lamellar bodies, constituting only 2%, was not only rab3D-positive but could also be labeled with the filamentous-actin probe phalloidin. A third subpopulation, constituting 9%, displayed actin coating without rab3D staining. We propose that these three lamellar body subpopulations represent consecutive intermediates along the regulated exocytotic pathway, implying that rab3D release and actin coating are intimately linked processes.




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