Abstract：
:While studying Bim, a BH3-only proapoptotic protein, we identified an approximately 36 kDa protein, which was abundantly expressed in all five strains of primary normal human prostate (NHP) epithelial cells but significantly reduced or lost in seven prostate cancer cell lines. The approximately 36 kDa protein was subsequently identified as annexin II by proteomic approach and confirmed by Western blotting using an annexin II-specific antibody. Conventional and 2D SDS-PAGE, together with Western blotting, also revealed reduced or lost expression of annexin I in prostate cancer cells. Subcellular localization studies revealed that in NHP cells, annexin II was distributed both in the cytosol and underneath the plasma membrane, but not on the cell surface. Prostate cancer cells showed reduced levels as well as altered expression patterns of annexin II. Since annexins play important roles in maintaining Ca(2+) homeostasis and regulating the cytoskeleton and cell motility, we hypothesized that the reduced or lost expression of annexin I/II might promote certain aggressive phenotypes of prostate cancer cells. In subsequent experiments, we indeed observed that restoration of annexin II expression inhibited the migration of the transfected prostate cancer cells without affecting cell proliferation or apoptosis. Hence, our results suggest that annexin II, and, likely, annexin I, may be endogenous suppressors of prostate cancer cell migration and their reduced or lost expression may contribute to prostate cancer development and progression.
journal_name
Oncogenejournal_title
Oncogeneauthors
Liu JW,Shen JJ,Tanzillo-Swarts A,Bhatia B,Maldonado CM,Person MD,Lau SS,Tang DGdoi
10.1038/sj.onc.1206196subject
Has Abstractpub_date
2003-03-13 00:00:00pages
1475-85issue
10eissn
0950-9232issn
1476-5594pii
1206196journal_volume
22pub_type
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