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E2F1-mediated human POMC expression in ectopic Cushing's syndrome.

Takako Araki, Ning-Ai Liu, Yukiko Tone1

  • 1Pituitary CenterCedars-Sinai Medical Center, Los Angeles, California, USA.

Endocrine-Related Cancer
|December 10, 2016
PubMed
Summary

Ectopic Cushing's syndrome involves severe hypercortisolemia. Researchers found that targeting the E2F1 protein can suppress adrenocorticotropic hormone (ACTH) production, offering a potential therapeutic strategy for this condition.

Keywords:
E2F1Ser-337 E2F1ectopic Cushing’s syndromeproopiomelanocortin (POMC)

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Oncology

Background:

  • Cushing's syndrome results from excess adrenocorticotropic hormone (ACTH) from pituitary or non-pituitary tumors.
  • Ectopic Cushing's syndrome presents severe hypercortisolemia with limited treatment options for paraneoplastic ACTH excess.

Purpose of the Study:

  • To identify subcellular therapeutic targets for ectopic Cushing's syndrome.
  • To elucidate the transcriptional regulation of proopiomelanocortin (POMC) and ACTH production in non-pituitary tumors.

Main Methods:

  • Investigated hPOMC transcription in non-pituitary tumor cells and patient-derived cell lines.
  • Identified E2F1 as a key regulator of hPOMC transcription via binding to the proximal promoter.
  • Assessed the effect of E2F1 inhibitors on hPOMC expression and ACTH levels in vitro and in vivo.

Main Results:

  • Ectopic hPOMC transcription is regulated by E2F1, independent of pituitary-specific factors.
  • E2F1 and DP1 co-expression significantly upregulate hPOMC mRNA in cancer cells.
  • Inhibiting E2F1 activity suppressed hPOMC gene expression, ACTH, and cortisol levels in preclinical models.

Conclusions:

  • E2F1-mediated hPOMC transcription is a novel mechanism in ectopic Cushing's syndrome.
  • Targeting E2F1 represents a potential therapeutic strategy to reduce ACTH production in ectopic Cushing's syndrome.