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Published 27 March 2006. doi:10.1083/jcb.200512012
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 172, Number 7, 1035-1044
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Article

Vectorial insertion of apical and basolateral membrane proteins in polarized epithelial cells revealed by quantitative 3D live cell imaging



Wei Hua1, David Sheff2, Derek Toomre1, and Ira Mellman1

1 Department of Cell Biology, Ludwig Institute for Cancer Research, Yale University School of Medicine, New Haven, CT 06520
2 Department of Pharmacology, The University of Iowa, Iowa City, IA 52242

Correspondence to Ira Mellman: ira.mellman{at}yale.edu

Although epithelial cells are known to exhibit a polarized distribution of membrane components, the pathways responsible for delivering membrane proteins to their appropriate domains remain unclear. Using an optimized approach to three-dimensional live cell imaging, we have visualized the transport of newly synthesized apical and basolateral membrane proteins in fully polarized filter-grown Madin–Darby canine kidney cells. We performed a detailed quantitative kinetic analysis of trans-Golgi network (TGN) exit, passage through transport intermediates, and arrival at the plasma membrane using cyan/yellow fluorescent protein–tagged glycosylphosphatidylinositol-anchored protein and vesicular stomatitis virus glycoprotein as apical and basolateral reporters, respectively. For both pathways, exit from the TGN was rate limiting. Furthermore, apical and basolateral proteins were targeted directly to their respective membranes, resolving current confusion as to whether sorting occurs on the secretory pathway or only after endocytosis. However, a transcytotic protein did reach the apical surface after a prior appearance basolaterally. Finally, newly synthesized proteins appeared to be delivered to the entire lateral or apical surface, suggesting—contrary to expectations—that there is not a restricted site for vesicle docking or fusion adjacent to the junctional complex.

Abbreviations used in this paper: 3D, three dimensional; GPI, glycosylphosphatidylinositol; VSVG, vesicular stomatitis virus glycoprotein.


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