TY - JOUR
T1 - PTEN Regulates PI(3,4)P2 Signaling Downstream of Class I PI3K
AU - Malek, Mouhannad
AU - Kielkowska, Anna
AU - Chessa, Tamara
AU - Anderson, Karen E.
AU - Barneda, David
AU - Pir, Pınar
AU - Nakanishi, Hiroki
AU - Eguchi, Satoshi
AU - Koizumi, Atsushi
AU - Sasaki, Junko
AU - Juvin, Véronique
AU - Kiselev, Vladimir Y
AU - Niewczas, Izabella
AU - Gray, Alexander
AU - Valayer, Alexandre
AU - Spensberger, Dominik
AU - Imbert, Marine
AU - Felisbino, Sergio
AU - Habuchi, Tomonori
AU - Beinke, Soren
AU - Cosulich, Sabina C.
AU - Le Novère, Nicolas
AU - Sasaki, Takehiko
AU - Clark, Jonathan
AU - Hawkins, Phillip T.
AU - Stephens, Len R.
N1 - N.L.N., L.R.S. and P.T.H. acknowledge financial support from the BBSRC (BB/J004456/1, BB/I003428/1, and BB/I003916/1) and The Wellcome Trust (WT085889MA). T.S. acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) (KAKENHI grant JP15H05899) and the Japan Agency for Medical Research and Development (AMED) (grant 16gm0710002h0304). A. Kielkowska is in receipt of a BBSRC-CASE PhD studentship with GSK.
PY - 2017/11/2
Y1 - 2017/11/2
N2 - The PI3K signaling pathway regulates cell growth and movement and is heavily mutated in cancer. Class I PI3Ks synthesize the lipid messenger PI(3,4,5)P3. PI(3,4,5)P3 can be dephosphorylated by 3- or 5-phosphatases, the latter producing PI(3,4)P2. The PTEN tumor suppressor is thought to function primarily as a PI(3,4,5)P3 3-phosphatase, limiting activation of this pathway. Here we show that PTEN also functions as a PI(3,4)P2 3-phosphatase, both in vitro and in vivo. PTEN is a major PI(3,4)P2 phosphatase in Mcf10a cytosol, and loss of PTEN and INPP4B, a known PI(3,4)P2 4-phosphatase, leads to synergistic accumulation of PI(3,4)P2, which correlated with increased invadopodia in epidermal growth factor (EGF)-stimulated cells. PTEN deletion increased PI(3,4)P2 levels in a mouse model of prostate cancer, and it inversely correlated with PI(3,4)P2 levels across several EGF-stimulated prostate and breast cancer lines. These results point to a role for PI(3,4)P2 in the phenotype caused by loss-of-function mutations or deletions in PTEN.
AB - The PI3K signaling pathway regulates cell growth and movement and is heavily mutated in cancer. Class I PI3Ks synthesize the lipid messenger PI(3,4,5)P3. PI(3,4,5)P3 can be dephosphorylated by 3- or 5-phosphatases, the latter producing PI(3,4)P2. The PTEN tumor suppressor is thought to function primarily as a PI(3,4,5)P3 3-phosphatase, limiting activation of this pathway. Here we show that PTEN also functions as a PI(3,4)P2 3-phosphatase, both in vitro and in vivo. PTEN is a major PI(3,4)P2 phosphatase in Mcf10a cytosol, and loss of PTEN and INPP4B, a known PI(3,4)P2 4-phosphatase, leads to synergistic accumulation of PI(3,4)P2, which correlated with increased invadopodia in epidermal growth factor (EGF)-stimulated cells. PTEN deletion increased PI(3,4)P2 levels in a mouse model of prostate cancer, and it inversely correlated with PI(3,4)P2 levels across several EGF-stimulated prostate and breast cancer lines. These results point to a role for PI(3,4)P2 in the phenotype caused by loss-of-function mutations or deletions in PTEN.
U2 - 10.1016/j.molcel.2017.09.024
DO - 10.1016/j.molcel.2017.09.024
M3 - Article
C2 - 29056325
SN - 1097-2765
VL - 68
SP - 566-580.e10
JO - Molecular Cell
JF - Molecular Cell
IS - 3
ER -