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Updated: Apr 23, 2026
14:23
Quantitative Measurement of Invadopodia-mediated Extracellular Matrix Proteolysis in Single and Multicellular Contexts
Published on: August 27, 2012
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INPP4B suppresses prostate cancer cell invasion
Cell Communication and Signaling : CCS
|September 25, 2014
Summary
Inositol polyphosphate-4-phosphatase type II (INPP4B) suppresses prostate cancer invasion and metastasis by inhibiting oncogenic PKC signaling. Restoring INPP4B expression is a potential therapeutic strategy for advanced prostate cancer.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Loss of INPP4B and PTEN phosphatases is common in metastatic prostate cancer.
- Reduced INPP4B expression correlates with poor prognosis and metastasis in prostate cancer.
Purpose of the Study:
- To investigate the role of INPP4B in suppressing prostate cancer invasion and metastasis.
- To elucidate the molecular mechanisms by which INPP4B exerts its tumor-suppressive effects.
Main Methods:
- Overexpression of INPP4B in invasive prostate cancer cells (PC-3).
- Global gene expression analysis to identify regulated genes.
- Inhibition of PI3K/Akt and PKC signaling pathways.
- Analysis of downstream targets like IL-8, PAK6, BIRC5, and COX-2.
Main Results:
- INPP4B expression suppressed prostate cancer cell invasion in vitro and in vivo.
- INPP4B regulated genes involved in cell adhesion, extracellular matrix, and cytoskeleton.
- INPP4B suppressed IL-8 and induced PAK6, while downregulating BIRC5 and COX-2 via PKC signaling.
- PI3K/Akt inhibition did not affect IL-8, but PKC inhibition mimicked INPP4B's effect on IL-8.
Conclusions:
- INPP4B acts as a novel suppressor of oncogenic PKC signaling in prostate cancer.
- INPP4B plays a crucial role in maintaining prostate epithelium homeostasis and inhibiting tumor metastasis.
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