Conditional disruption of rictor demonstrates a direct requirement for mTORC2 in skin tumor development and continued growth of established tumors

Carr, T. D. and Feehan, R. P. and Hall, M. N. and Rüegg, M. A. and Shantz, L. M.. (2015) Conditional disruption of rictor demonstrates a direct requirement for mTORC2 in skin tumor development and continued growth of established tumors. Carcinogenesis, 36 (4). pp. 487-497.

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Official URL: http://edoc.unibas.ch/dok/A6357876

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Activation of signaling dependent on the mammalian target of rapamycin (mTOR) has been demonstrated in a variety of human malignancies, and our previous work suggests that mTOR complex 1 (mTORC1) and mTORC2 may play unique roles in skin tumorigenesis. The purpose of these studies was to investigate the function of mTORC2-dependent pathways in skin tumor development and the maintenance of established tumors. Using mice that allow spatial and temporal control of mTORC2 in epidermis by conditional knockout of its essential component Rictor, we studied the effect of mTORC2 loss on both epidermal proliferation and chemical carcinogenesis. The results demonstrate that mTORC2 is dispensable for both normal epidermal proliferation and the hyperproliferative response to treatment with TPA. In contrast, deletion of epidermal Rictor prior to initiation in DMBA/TPA chemical carcinogenesis was sufficient to dramatically delay tumor development and resulted in reduced tumor number and size compared to control groups. Silencing of Rictor expression in tumor-bearing animals triggered regression of established tumors and increased caspase 3 cleavage without changes in proliferation. In vitro experiments demonstrate an increased sensitivity to caspase-dependent apoptosis in the absence of rictor, which is dependent on mTORC2 signaling. These studies demonstrate that mTORC2 activation is essential for keratinocyte survival, and suggest that inhibition of mTORC2 has value in chemoprevention by eliminating carcinogen-damaged cells during the early stages of tumorigenesis, and in therapy of existing tumors by restricting critical pro-survival pathways.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Growth & Development > Biochemistry (Hall)
05 Faculty of Science > Departement Biozentrum > Neurobiology > Pharmacology/Neurobiology (Rüegg)
UniBasel Contributors:Hall, Michael N. and Rüegg, Markus A.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Oxford University Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Nov 2017 08:09
Deposited On:08 May 2015 08:45

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