Abstract
Constitutive activation of the Janus-activated kinase/signal transducer and activator of transcription (STAT) pathway promotes the proliferation and survival of cancer cells in culture and is associated with various cancers, including those of the ovary. We found that constitutively activated STAT3 levels correlated with aggressive clinical behavior of ovarian carcinoma specimens. Furthermore, inhibition of STAT3 reduced the motility of ovarian cancer cells in vitro. Surprisingly, we found that activated STAT3 localized not only to nuclei but also to focal adhesions in these cells. Activated STAT3 coimmunoprecipitated with phosphorylated paxillin and focal adhesion kinase and required paxillin and Src for its localization to focal adhesions. These results suggest that Janus-activated kinase/STAT signaling may contribute to ovarian cancer cell invasiveness.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Cell Movement / physiology*
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Cytoskeletal Proteins / metabolism
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DNA-Binding Proteins / metabolism
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DNA-Binding Proteins / physiology*
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Epithelial Cells / pathology
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Female
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Focal Adhesion Kinase 1
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Focal Adhesion Protein-Tyrosine Kinases
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Focal Adhesions / metabolism*
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Focal Adhesions / pathology
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Humans
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Mice
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NIH 3T3 Cells
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Ovarian Neoplasms / metabolism*
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Ovarian Neoplasms / pathology
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Paxillin
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Phosphoproteins / metabolism
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Phosphorylation
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Protein-Tyrosine Kinases / metabolism
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STAT3 Transcription Factor
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Trans-Activators / metabolism
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Trans-Activators / physiology*
Substances
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Cytoskeletal Proteins
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DNA-Binding Proteins
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PXN protein, human
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Paxillin
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Phosphoproteins
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Pxn protein, mouse
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STAT3 Transcription Factor
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STAT3 protein, human
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Stat3 protein, mouse
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Trans-Activators
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Protein-Tyrosine Kinases
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Focal Adhesion Kinase 1
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Focal Adhesion Protein-Tyrosine Kinases
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PTK2 protein, human
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Ptk2 protein, mouse