Journal
CANCER SCIENCE
Volume 108, Issue 5, Pages 941-951Publisher
WILEY
DOI: 10.1111/cas.13215
Keywords
Cell invasion; focal adhesion; Lpd; PI(3,4)P-2; SHIP2
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Funding
- Japan Society for the Promotion of Science (JSPS) [16K08585]
- Grants-in-Aid for Scientific Research [16K08585] Funding Source: KAKEN
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Phosphoinositides play pivotal roles in the regulation of cancer cell phenotypes. Among them, phosphatidylinositol 3,4-bisphosphate (PI(3,4)P-2) localizes to the invadopodia, and positively regulates tumor cell invasion. In this study, we examined the effect of PI(3,4)P-2 on focal adhesion dynamics in MDA-MB-231 basal breast cancer cells. Knockdown of SHIP2, a phosphatidylinositol 3,4,5-trisphosphatase (PIP3) 5-phosphatase that generates PI(3,4)P-2, in MDA-MB-231 breast cancer cells, induced the development of focal adhesions and cell spreading, leading to the suppression of invasion. In contrast, knockdown of PTEN, a 3-phosphatase that de-phosphorylates PIP3 and PI(3,4)P-2, induced cell shrinkage and increased cell invasion. Interestingly, additional knockdown of SHIP2 rescued these phenotypes. Overexpression of the TAPP1 PH domain, which binds to PI (3,4)P-2, and knockdown of Lpd, a downstream effector of PI(3,4)P-2, resulted in similar phenotypes to those induced by SHIP2 knockdown. Taken together, our results suggest that inhibition of PI(3,4)P-2 generation and/or downstream signaling could be useful for inhibiting breast cancer metastasis.
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