. 2006 Nov; 17(6):463-74.
doi: 10.1016/j.cytogfr.2006.09.010.

The regulation and role of osteopontin in malignant transformation and cancer

Mohamed K El-Tanani 1 Frederick Charles Campbell  Vittal Kurisetty  Dachuan Jin  Mella McCann  Philip S Rudland  
  • PMID: 17113338
  •     66 citations


Osteopontin (OPN) is a predominantly secreted extracellular matrix glycophosphoprotein which binds to alpha v-containing integrins and has an important role in malignant cell attachment and invasion. High OPN expression in the primary tumor is associated with early metastasis and poor outcome in human breast and other cancers. Forced OPN overexpression in benign cells may induce neoplastic-like cell behaviour including increased attachment and invasion in vitro as well as the ability to metastasize in vivo. Conversely, OPN inhibition by antisense cDNA impedes cell growth and tumor forming capacity. OPN is not mutationally activated in cancer but its expression is regulated by Wnt/Tcf signaling, steroid receptors, growth factors, ras, Ets and AP-1 transcription factors. Presumably these factors are implicated in induction of OPN overexpression in cancer. Greater understanding of the role of OPN in neoplastic change and its transcriptional regulation may enable development of novel cancer treatment strategies.

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