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Am J Physiol Lung Cell Mol Physiol 279: L631-L640, 2000;
1040-0605/00 $5.00
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Vol. 279, Issue 4, L631-L640, October 2000

Surface-expressed lamellar body membrane is recycled to lamellar bodies

S. Schaller-Bals, S. R. Bates, K. Notarfrancesco, J. Q. Tao, A. B. Fisher, and H. Shuman

Institute for Environmental Medicine, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania 19104-6068

Monoclonal antibody (MAb) 3C9, an antibody generated to the lamellar body of rat lung type II pneumocytes, specifically labels the luminal face of the lamellar body membrane. To follow the retrieval of lamellar body membrane from the cell surface in these cells, MAb 3C9 was instilled into rat lungs. In vivo, it was endocytosed by type II cells but not by other lung cells. In type II cells that were isolated from rat lungs by elastase digestion and cultured on plastic for 24 h, MAb 3C9 first bound to the cell surface, then was found in endosomes, vesicular structures, and multivesicular bodies and, finally, clustered on the luminal face of lamellar body membranes. The amount internalized reached a plateau after 1.5 h of incubation and was stimulated with the secretagogue ATP. In double-labeling experiments, internalized MAb 3C9 did not completely colocalize with NBD-PC liposomes or the nonspecific endocytic marker TMA-DPH, suggesting that lamellar body membrane is retrieved back to existing lamellar bodies by a pathway different from that of bulk membrane and may be one pathway for surfactant endocytosis. The lamellar body membrane components are retrieved as subunits that are redistributed among the preexisting lamellar bodies in the cell.

endocytosis; membrane trafficking; organelle biogenesis; type II pneumocytes


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