Abstract:
:Galectin-3 is a multifunctional carbohydrate-binding protein found in the nucleus, cytoplasm and the extracellular milieu. Nuclear galectin-3 expression is associated with cell proliferation, and its role in pre-mRNA splicing has been suggested. In this report, we investigated the role of galectin-3 on cyclin D(1) gene expression, a critical inducer of the cell cycle and a potential oncogene in human cancer. We found that galectin-3 induces cyclin D(1) promoter activity in human breast epithelial cells independent of cell adhesion through multiple cis-elements, including the SP1 and CRE sites. We present evidence that galectin-3 induction of the cyclin D(1) promoter may result from enhancement/stabilization of nuclear protein-DNA complex formation at the CRE site of the cyclin D(1) promoter. We also show that galectin-3 co-operates with, but does not depend on, pRb for cyclin D(1) promoter activation. The present study reveals a growth promoting activity of galectin-3 through cyclin D(1) induction, and suggests a novel function of nuclear galectin-3 in the regulation of gene transcription.
journal_name
Oncogenejournal_title
Oncogeneauthors
Lin HM,Pestell RG,Raz A,Kim HRdoi
10.1038/sj.onc.1205820subject
Has Abstractpub_date
2002-11-14 00:00:00pages
8001-10issue
52eissn
0950-9232issn
1476-5594journal_volume
21pub_type
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