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Biochem Biophys Res Commun. 2006 Mar 31;342(1):179-83. Epub 2006 Feb 2.

Identification of integrin alpha1 as an interacting protein of protein tyrosine phosphatase PRL-3.

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Department of Biochemistry and Molecular Biology, Peking University School of Oncology, Beijing Cancer Hospital and Institute, Beijing 100036, PR China.


PRL-3 is a newly identified protein tyrosine phosphatase associated with tumor metastasis. It is over-expressed in various cancers, such as colorectal cancer, gastric cancer, and ovarian cancer, and is correlated with the progression and survival of cancers. Although PRL-3 plays a causative role in promoting cancer cell invasion and metastasis, the molecular mechanism is unknown. To investigate PRL-3's roles in tumorigenesis and signal transduction pathway, we screened the human placenta brain cDNA library with the bait of PRL-3 in yeast two-hybrid system. Then we identified integrin alpha1 as a PRL-3-interacting protein for the first time, and verified this physical association with pull-down and co-immunoprecipitation assays. Furthermore, we found that PRL-3 could down-regulate the tyrosine-phosphorylation level of integrin beta1 and increased the phosphorylation level of Erk1/2. Our present discovery will provide new clues for elucidating the molecular mechanism of PRL-3 in promoting cancer invasion and metastasis.

[Indexed for MEDLINE]

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