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Vol. 13, Issue 1, 96-109, January 2002
and
*Department of Biochemistry, Weill Medical College of Cornell
University, New York, New York 10021; and A significant fraction of internalized transferrin (Tf)
concentrates in the endocytic recycling compartment (ERC), which is near the microtubule-organizing center in many cell types. Tf then
recycles back to the cell surface. The mechanisms controlling the
localization, morphology, and function of the ERC are not fully
understood. We examined the relationship of Tf trafficking with
microtubules (MTs), specifically the subset of stable, detyrosinated Glu MTs. We found some correlation between the level of stable Glu MTs
and the distribution of the ERC; in cells with low levels of Glu MTs
concentrated near to the centriole, the ERC was often tightly
clustered, whereas in cells with higher levels of Glu MTs throughout
the cell, the ERC was more dispersed. The clustered ERC in Chinese
hamster ovary cells became dispersed when the level of Glu MTs was
increased with taxol treatment. Furthermore, in a temperature-sensitive
Chinese hamster ovary cell line (B104-5), the cells had more Glu MTs
when the ERC became dispersed at elevated temperature. Microinjecting
purified anti-Glu tubulin antibody into B104-5 cells at elevated
temperature induced the redistribution of the ERC to a tight cluster.
Microinjection of anti-Glu tubulin antibody slowed recycling of Tf to
the cell surface without affecting Tf internalization or delivery to
the ERC. Similar inhibition of Tf recycling was caused by
microinjecting anti-kinesin antibody. These results suggest that stable
Glu MTs and kinesin play a role in the organization of the ERC and in
facilitating movement of vesicles from the ERC to the cell surface.
Departments of
Pathology and Anatomy and Cell Biology, Columbia University, College of
Physicians and Surgeons, New York, New York 10032
Corresponding author. E-mail address:
frmaxfie{at}mail.med.cornell.edu.
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