Modulation of intracellular transport of acidic fibroblast growth factor by mutations in the cytoplasmic receptor domain.
Endocytic uptake and intracellular transport of acidic fibroblast growth factor (aFGF) was studied in cells transfected with FGF receptor 4 with mutations in the cytoplasmic part. Endocytic uptake in HeLa cells was reduced but not abolished when the tyrosine kinase of the receptor was inactivated by mutations or deletions. The tyrosine kinase-dependent endocytosis of aFGF was prevented by the expression of a dominant negative dynamin mutant that blocks endocytosis from coated pits and caveolae. However, more than half of the total endocytic uptake of aFGF was not affected under these conditions, indicating an endocytic uptake mechanism not involving coated pits or caveolae. Mutation or deletion of a putative caveolin-binding sequence did not prevent the localization of part of the receptors to a low density, caveolin-containing subcellular fraction. Whereas wild-type receptor transfers the growth factor from early endosomes to the recycling compartment, kinase negative, full length receptors were inefficient in this respect and the growth factor instead accumulated in lysosomes. By contrast, when most of the intracellular part of the receptor, including the kinase domain, was removed, aFGF was transported to the recycling compartment, as in cells that express wild-type receptors, suggesting the presence of a kinase-regulated targeting signal in the cytoplasmic tail.
Citores
L
L
Institue for Cancer Research, The Norwegian Radium Hospital, Montebello, Oslo, Norway.
Khnykin
D
D
Sørensen
V
V
Wesche
J
J
Klingenberg
O
O
Wiedłocha
A
A
Olsnes
S
S
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D051242:Caveolin 1; D022461:Caveolins / Q000378:metabolism; D017931:DNA Primers; D004705:Endocytosis; D016220:Fibroblast Growth Factor 1 / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009154:Mutation; D011485:Protein Binding; D021381:Protein Transport; D018160:Receptors, Cytoplasmic and Nuclear / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014162:Transfection
C495540:CAV1 protein, human; D051242:Caveolin 1; D022461:Caveolins; D017931:DNA Primers; D018160:Receptors, Cytoplasmic and Nuclear; D016220:Fibroblast Growth Factor 1