Nuclear translocation of human angiogenin in cultured human umbilical artery endothelial cells is microtubule and lysosome independent.

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.

authors

Li R,Riordan JF,Hu G

doi

10.1006/bbrc.1997.7290

subject

Has Abstract

pub_date

1997-09-18 00:00:00

pages

305-12

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006291X97972909

journal_volume

238

pub_type

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