Potential tumor-suppressive role of monoglyceride lipase in human colorectal cancer.

Potential tumor-suppressive role of monoglyceride lipase in human colorectal cancer.
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DOI:
10.1038/onc.2012.34
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发表时间:
2013-01-10
期刊:
影响因子:
8
通讯作者:
Huang, Y.
Huang, Y.
中科院分区:
医学1区
文献类型:
--
作者:
Sun, H.;Jiang, L.;Luo, X.;Jin, W.;He, Q.;An, J.;Lui, K.;Shi, J.;Rong, R.;Su, W.;Lucchesi, C.;Liu, Y.;Sheikh, M. S.;Huang, Y.

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Human Monoglyceride Lipase (MGL) is a recently identified lipase and very little is known about its regulation and function in cellular regulatory processes, particularly in context to human malignancy. In this study, we investigated the regulation and function of Monoglyceride Lipase in human cancer(s) and report that MGL expression was either absent or reduced in the majority of primary colorectal cancers. Immunohistochemical studies showed that reduction of MGL expression in the colorectal tumor tissues predominantly occurred in the cancerous epithelial cells. MGL was found to reside in the core surface of a cellular organelle named “lipid body”. Furthermore, it was found to selectively interact with a number of phospholipids including phosphotidic acid and phosphoinositol(3,4,5)P3, phosphoinositol(3,5)P2, phosphoinositol(3,4)P2 and several other phosphoinositides, and among all phosphoinositides analyzed, its interaction with PI(3,4,5)P3 was found to be the strongest. In addition, overexpression of MGL suppressed colony formation in tumor cell lines and knockdown of MGL resulted in increased Akt phosphorylation. Together, our results suggest that MGL plays a negative regulatory role in PI3-K/Akt signaling and tumor cell growth.
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