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Published on: January 17, 2018
Characterization of MENX-associated pituitary tumours
I Marinoni1, M Lee, S Mountford
1Institute of Pathology, Helmholtz Zentrum München, Neuherberg, Germany.
Neuropathology and Applied Neurobiology
|April 25, 2012
Summary
Multiple endocrine neoplasia X (MENX) syndrome in rats causes pituitary adenomas. These tumors originate from gonadotroph cells, highlighting the critical role of p27 in regulating their growth.
Area of Science:
- Endocrinology
- Oncology
- Cell Biology
Background:
- Multiple Endocrine Neoplasia X (MENX) syndrome is caused by a germline mutation in the cell cycle inhibitor p27.
- Pituitary adenomas are common tumors, and understanding their pathogenesis is crucial for developing effective treatments.
Purpose of the Study:
- To characterize the pathological features, serum hormone levels, and ex vivo cultures of pituitary adenomas in rats with MENX syndrome.
- To establish the MENX rat as a valuable animal model for studying pituitary adenomas.
Main Methods:
- Immunohistochemistry
- Double immunofluorescence
- Electron microscopy
- RT-PCR
- Serum hormone level measurement
- Ex vivo cultures
Main Results:
- MENX rat pituitary adenomas originate from the gonadotroph lineage and exhibit progressive growth.
- Tumors are characterized by chromophobic cells expressing alpha-subunit (αGSU), mitotic activity, and high Ki67 labeling.
- Some neoplastic cells show co-expression of lineage markers, indicating potential for multipotency.
Conclusions:
- p27 is essential for regulating gonadotroph cell proliferation.
- The MENX syndrome in rats provides a unique model for investigating the pathogenesis of gonadotroph adenomas.
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