Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/113538
Title: Lactacystin-induced apoptosis of cultured mouse cortical neurons is associated with accumulation of PTEN in the detergent-resistant membrane fraction
Authors: Cheung, N.S.
Choy, M.S. 
Halliwell, B.
Teo, T.S.
Bay, B.H.
Lee, A.Y.-W.
Qi, R.Z.
Koh, V.H.
Whiteman, M.
Koay, E.S.-C.
Chiu, L.L.
Zhu, H.-J.
Wong, K.P.
Beart, P.M.
Cheng, H.-C.
Keywords: Caspase-3
Neuronal death
Proteasome
Tumor suppressor
Issue Date: Aug-2004
Citation: Cheung, N.S.,Choy, M.S.,Halliwell, B.,Teo, T.S.,Bay, B.H.,Lee, A.Y.-W.,Qi, R.Z.,Koh, V.H.,Whiteman, M.,Koay, E.S.-C.,Chiu, L.L.,Zhu, H.-J.,Wong, K.P.,Beart, P.M.,Cheng, H.-C. (2004-08). Lactacystin-induced apoptosis of cultured mouse cortical neurons is associated with accumulation of PTEN in the detergent-resistant membrane fraction. Cellular and Molecular Life Sciences 61 (15) : 1926-1934. ScholarBank@NUS Repository.
Abstract: The tumor suppressor function of PTEN is attributed to its phospholipid phosphatase activity that dephosphorylates the plasma membrane phosphatidylinositol-(3,4,5)-triphosphate [PtdIns(3,4,5)P3]. Implicit in this notion is that PTEN needs to be targeted to the plasma membrane to dephosphorylate PtdIns(3,4,5)P3. However, the recruitment of PTEN to the plasma membrane is not fully understood. Here, we demonstrate PTEN accumulation in the detergent-insoluble fraction of neuronal cells in response to treatment by the proteasome inhibitor lactacystin. First, lactacystin induces apoptosis and the activation of caspase-3 in cultured cortical neurons. Second, PTEN undergoes proteolysis to form a truncated 50-kDa form that lacks parts of its C-terminal tail. Third, the truncated PTEN is stably associated with the detergent-insoluble fraction in which the plasma membrane marker protein flotillin-1 resides. Taken together, our results suggest that truncation and accumulation of PTEN to the detergent-insoluble membrane fraction are two events associated with the apoptotic signals of the proteasome inhibitor in cortical neurons.
Source Title: Cellular and Molecular Life Sciences
URI: http://scholarbank.nus.edu.sg/handle/10635/113538
ISSN: 1420682X
Appears in Collections:Staff Publications

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