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Gastroenteropancreatic tumours and prohormones
J F Rehfeld1, L Bardram, L Hilsted
1University Dept. of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark.
Scandinavian Journal of Gastroenterology. Supplement
|January 1, 1996
Summary
Danish researchers reviewed prohormone processing in endocrine tumors, finding conventional assays inaccurate. They developed processing-independent analysis (PIA) for better quantification of hormone synthesis and improved early diagnosis of gut and pancreatic tumors.
Area of Science:
- Endocrinology and Gastroenterology
- Molecular Biology and Biochemistry
Background:
- Prohormone structures and post-translational maturation are crucial for hormone function.
- Endocrine tumors often exhibit altered prohormone processing, complicating diagnosis.
- Conventional assays measuring only bioactive hormones are insufficient for tumor activity assessment.
Purpose of the Study:
- To review Danish contributions to understanding prohormone processing in pancreatic and gastrointestinal systems.
- To highlight the limitations of current diagnostic methods for endocrine tumors.
- To introduce a novel analytical principle for accurate quantification of hormone synthesis.
Main Methods:
- Review of existing literature on prohormone processing, with emphasis on Danish research.
- Description of general, cell-specific, and tumor-specific prohormone-processing patterns.
- Development and introduction of processing-independent analysis (PIA) for comprehensive product quantification.
Main Results:
- Prohormone processing in endocrine tumors is frequently attenuated, leading to inaccurate measurements by conventional assays.
- Measurements including prohormones and intermediates provide more accurate hormone synthesis data in gastroenteropancreatic endocrine tumors.
- Processing-independent analysis (PIA) quantitates the entire translation product, regardless of processing extent.
Conclusions:
- Accurate assessment of endocrine tumor activity requires measuring the entire prohormone translation product, not just bioactive hormones.
- Processing-independent analysis (PIA) offers a more precise method for quantifying hormone synthesis in gastroenteropancreatic endocrine tumors.
- Further prospective evaluation of PIA in routine diagnostics is needed to improve early diagnosis of endocrine tumors.