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The mTORC1 Complex Is Significantly Overactivated in SDHX-Mutated Paragangliomas
Lindsey Oudijk1, Thomas Papathomas, Ronald de Krijger
1Department of Pathology, Erasmus MC - University Medical Center Rotterdam, Rotterdam, The Netherlands.
The mTOR pathway is activated in pheochromocytomas and paragangliomas. mTORC1 complex is preferentially overactivated in head and neck paragangliomas, particularly those with SDHX mutations.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- Pheochromocytomas (PCCs) and paragangliomas (PGLs) are neuroendocrine tumors.
- The mTOR pathway plays a crucial role in cell growth and metabolism.
Purpose of the Study:
- To investigate the activation pattern of the mTOR pathway in sporadic and hereditary PCCs and PGLs.
- To correlate mTOR pathway activation with tumor characteristics and genetic mutations.
Main Methods:
- Analysis of 178 PCCs and 44 PGLs using immunohistochemistry.
- Assessment of mTOR pathway components and phosphorylated forms.
- Correlation with known germline and somatic mutations (VHL, RET, NF1, MAX, SDHX, H-RAS).
Main Results:
- mTOR pathway activation was confirmed in PCCs/PGLs.
- Overexpression of total mTOR, p-S6K, p-S6, p-Raptor, and p-AMPK in PGLs vs. PCCs, and head and neck vs. abdominal locations.
- mTORC1 complex preferentially activated in SDHX-mutated tumors within cluster 1.
Conclusions:
- The mTOR pathway is significantly activated in a majority of PCCs and PGLs.
- Preferential activation of the mTORC1 complex is observed in head and neck PGLs and/or those with SDHX mutations.
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