Abstract:
:Exogenous angiogenin undergoes rapid nuclear translocation in cultured human umbilical artery endothelial cells at 37 degrees C but not at 4 degrees C. Treatment of cells with colchicine, nocodazole and taxol, which disrupt the microtubule system, does not affect the nuclear translocation process of angiogenin, suggesting that cells transport internalized angiogenin in a microtubule independent fashion. Lysosomal inhibitors, chloroquine and leupeptin, neither inhibit nor enhance the nuclear translocation of angiogenin, indicating that lysosomal targeting and processing are not required for, and do not compete with, the nuclear translocation. Moreover, treatment of cells with a tyrosine kinase antagonist, genistein, does not change the ability of the cells to translocate angiogenin into the nucleus. We suggest that exogenous angiogenin is translocated to the nucleus by a mechanism that does not require activation of tyrosine kinase, but includes receptor-mediated endocytosis, microtubule and lysosome independent transport across the cytoplasm, and nuclear localization sequence-assisted nuclear import.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Li R,Riordan JF,Hu Gdoi
10.1006/bbrc.1997.7290subject
Has Abstractpub_date
1997-09-18 00:00:00pages
305-12issue
2eissn
0006-291Xissn
1090-2104pii
S0006291X97972909journal_volume
238pub_type
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journal_title:Biochemical and biophysical research communications
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