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Vol. 10, Issue 11, 3835-3848, November 1999
Institute for Cancer Research, The Norwegian Radium Hospital,
Montebello, 0310 Oslo, Norway
Endocytic uptake and intracellular transport of acidic FGF was
studied in cells transfected with FGF receptor 4 (FGFR4). Acidification of the cytosol to block endocytic uptake from coated pits did not
inhibit endocytosis of the growth factor in COS cells transfected with
FGFR4, indicating that it is to a large extent taken up by an
alternative endocytic pathway. Fractionation of the cells demonstrated that part of the growth factor receptor was present in a low-density, caveolin-containing fraction, but we were unable to demonstrate binding
to caveolin in immunoprecipitation studies. Upon treatment of the cells
with acidic FGF, the activated receptor, together with the growth
factor, moved to a juxtanuclear compartment, which was identified as
the recycling endosome compartment. When the cells were lysed with
Triton X-100,
3-([3-chloramidopropyl]dimethylammonio)-2-hydroxy-1-propanesulfonate, or 2-octyl glucoside, almost all surface-exposed and endocytosed FGFR4
was solubilized, but only a minor fraction of the total FGFR4 in the
cells was found in the soluble fraction. The data indicate that the
major part of FGFR4 is anchored to detergent-insoluble structures,
presumably cytoskeletal elements associated with the recycling endosome compartment.
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