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EGFR Induces E2F1-Mediated Corticotroph Tumorigenesis
Takako Araki1, Xiaohai Liu1, Hiraku Kameda1
1Pituitary Center, Department of Medicine and.
Journal of the Endocrine Society
|December 22, 2017
Summary
Epidermal growth factor receptor (EGFR) drives Cushing disease by promoting pituitary tumor growth. Inhibiting EGFR or targeting E2F1 shows promise for treating this condition.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- Epidermal growth factor receptor (EGFR) plays a role in adrenocorticotrophic hormone (ACTH)-secreting pituitary adenomas, which cause Cushing disease.
- EGFR influences ACTH production and corticotroph cell growth.
Purpose of the Study:
- To investigate EGFR as a therapeutic target for Cushing disease.
- To develop a mouse model for studying ACTH-secreting pituitary adenomas.
Main Methods:
- Generated corticotroph-specific human EGFR transgenic mice (corti-EGFR-Tg).
- Administered Gefitinib, an EGFR tyrosine kinase inhibitor.
- Analyzed tumor markers, hormone levels, and E2F1 activity in mice and human tumor samples.
Main Results:
- Corti-EGFR-Tg mice developed aggressive ACTH-secreting pituitary adenomas and Cushing phenotype.
- Gefitinib treatment significantly reduced tumor POMC expression, ACTH, and corticosterone levels.
- EGFR inhibition reversed E2F1 activity, and E2F1 inhibition suppressed POMC/ACTH in human cells.
Conclusions:
- The corti-EGFR-Tg mouse model effectively recapitulates ACTH-secreting pituitary adenomas and Cushing disease.
- EGFR is validated as a relevant target for corticotroph tumor development.
- E2F1 emerges as a potential therapeutic target for ACTH-dependent Cushing disease.
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