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Reduced TGF-beta1 expression and its target genes in human insulinomas
A Nabokikh1, A Ilhan, M Bilban
11Department of Medicine III, Medical University of Vienna, Austria.
Transforming growth factor beta 1 (TGF-beta1) signaling is reduced in human insulinomas, impacting cell growth. This down-regulation, despite increased TGF-beta receptor II, suggests a novel pathway in pancreatic tumor development.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Insulinomas are rare pancreatic neuroendocrine tumors.
- Signaling pathways regulating beta-cell growth are not fully understood.
- Transforming growth factor beta 1 (TGF-beta1) signaling plays a role in cell replication.
Purpose of the Study:
- To identify signaling pathways involved in insulinoma cell growth.
- To investigate the role of TGF-beta1 signaling in human insulinomas.
Main Methods:
- Microarray analysis of gene expression profiles.
- Quantitative real-time PCR (qRT-PCR) for gene expression.
- Immunofluorescence and confocal microscopy for protein expression.
Main Results:
- Down-regulation of TGF-beta1 and its target genes (TGFBI, NNMT, RPN2) in insulinomas.
- Up-regulation of TGF-beta receptor II (TGFBR2) in insulinomas.
- Reduced SMAD2/3 protein levels in insulinomas compared to pancreatic islets.
Conclusions:
- TGF-beta1 signaling is abrogated in human insulinomas, a novel finding.
- The up-regulation of TGFBR2 does not compensate for decreased TGF-beta1 levels.
- Data suggest parallels between endocrine and exocrine pancreatic tumor development.
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