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Related Experiment Videos

Ectopic ACTH secretion. A misnomer.

W D Odell1

  • 1Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City.

Endocrinology and Metabolism Clinics of North America
|June 1, 1991
PubMed
Summary
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Ectopic ACTH production, a common cause of Cushing's syndrome, originates from cancers converting proopiomelanocortin (POMC) into active ACTH. This study clarifies that such production is not truly ectopic but a consequence of specific cancer cell activity.

Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Ectopic ACTH production is a frequent cause of Cushing's syndrome.
  • Identifying the source of ACTH can be challenging when neoplasms are not obvious.
  • Normal tissues produce inactive proopiomelanocortin (POMC), a precursor to ACTH.

Purpose of the Study:

  • To investigate the origin of ectopic ACTH production in Cushing's syndrome.
  • To differentiate between pituitary and non-pituitary ACTH sources.
  • To elucidate the role of cancer cells in converting POMC to active ACTH.

Main Methods:

  • Review of current literature on ectopic ACTH syndrome.
  • Analysis of POMC conversion to ACTH in various cancer types.
  • Correlation of histologic type with ACTH production.

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Main Results:

  • All cancers increase POMC production.
  • Selected cancers convert POMC to biologically active ACTH.
  • This process explains the 'ectopic' ACTH syndrome.

Conclusions:

  • ACTH production by certain cancers is not truly ectopic.
  • Understanding POMC conversion is key to diagnosing Cushing's syndrome.
  • Histologic type influences the potential for ectopic ACTH production.