MyosinV controls PTEN function and neuronal cell size.

MyosinV controls PTEN function and neuronal cell size.
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DOI:
10.1038/ncb1961
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发表时间:
2009-10
影响因子:
21.3
通讯作者:
Eickholt, Britta J.
Eickholt, Britta J.
中科院分区:
生物学1区
文献类型:
--
作者:
van Diepen, Michiel T.;Parsons, Maddy;Downes, C. Peter;Leslie, Nicholas R.;Hindges, Robert;Eickholt, Britta J.

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The tumour suppressor PTEN can inhibit proliferation and migration as well as control cell growth in different cell types. PTEN functions predominately as a lipid phsophatase, converting PI(3,4,5)P3 to PI(4,5)P2, thereby antagonizing PI3K (Phosphoinositide 3-kinase) and its established downstream effector pathways. However, much is unclear concerning the mechanisms that regulate PTEN movement to the cell membrane necessary for PTEN’s activity towards PI(3,4,5)P3. Here we show a requirement for functional motor proteins in the control of PI3K signalling, involving a previously unknown association between PTEN and MyosinV. FRET measurements revealed that PTEN interacts directly with MyosinV, dependent on PTEN phosphorylation mediated by CK2 and/or GSK3. Inactivation of MyosinV-transport function in neurons increased cell size, which – in line with known attributes of PTEN-loss - required PI3K and mTor. Our data demonstrate a myosin-based transport mechanism regulating PTEN function, providing new insights into the signalling networks regulating cell growth.
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