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Updated: Aug 29, 2026
Oncogene Expression Analysis with Alterations in pH in a Pancreatic Ductal Cell Line
Published on: April 11, 2025
Global expression analysis of well-differentiated pancreatic endocrine neoplasms using oligonucleotide microarrays
Anirban Maitra1, Donna E Hansel, Pedram Argani
1Department of Pathology, Johns Hopkins Medical Institutions, Baltimore, Maryland 21205, USA. amaitra1@jhmi.edu
Purpose:
Pancreatic endocrine neoplasms (PENs) are rare, mostly well-differentiated endocrine neoplasms, whose biology has been poorly characterized. Global expression microarrays can document abnormal pathways that impact on tumorigenesis and disease progression.
Experimental Design:
RNA was extracted from eight well-differentiated PENs and three highly enriched pancreatic islet cell samples (80-90% purity), and examined using the Affymetrix U133A oligonucleotide microarray. Microarray data were normalized using dCHIP for identification of differentially expressed genes. PEN tissue microarrays were constructed from 53 archival PENs for immunohistochemical validation of microarray data.
Results:
Sixty-six transcripts were overexpressed > or =3-fold in PENs compared with normal islet cells, including putative oncogenes (MLLT10/AF10), growth factors [insulin-like growth factor-binding protein 3 (IGFBP3)], cell adhesion and migration molecules (fibronectin), and endothelial elements (MUC18/MelCAM and CD31). A total of 119 transcripts were underexpressed < or =3-fold in PENs compared with normal islet cells, including cell cycle checkpoint proteins (p21/Cip1), the MIC2 (CD99) cell surface glycoprotein, putative metastasis suppressor genes (NME3), and junD, a MEN1-regulated transcription factor. Using PEN tissue microarrays, we confirmed the differential up-regulation of IGFBP3 (70%) and fibronectin (22%) and differential down-regulation of p21 (46%) and MIC2 (CD99; 91%) in PENs versus normal pancreatic islets. IGFBP3 overexpression was significantly more common in metastatic (93%) versus primary PEN lesions (60%), P=0.022. Fibronectin overexpression demonstrated a trend toward significance in lymphatic PEN metastases (55%) compared with primary PEN lesions (24%; P=0.14).
Conclusions:
Global expression analysis provides insight into tumorigenic pathways in PENs and may identify potential prognostic and therapeutic markers for these uncommon neoplasms.
Insights
This study reveals key gene expression differences in pancreatic endocrine neoplasms (PENs), identifying potential biomarkers like IGFBP3 and fibronectin for tumor progression and metastasis. These findings offer insights into PEN biology and potential therapeutic targets.
Area of Science:
- Endocrinology
- Oncology
- Genomics
Background:
- Pancreatic endocrine neoplasms (PENs) are rare tumors with poorly understood biology.
- Global gene expression analysis offers a powerful tool to uncover molecular pathways involved in tumorigenesis and disease progression.
Purpose of the Study:
- To characterize the global gene expression profile of well-differentiated PENs.
- To identify differentially expressed genes that may serve as prognostic or therapeutic markers for PENs.
Main Methods:
- RNA extracted from 8 PENs and 3 normal pancreatic islet samples.
- Oligonucleotide microarray analysis (Affymetrix U133A) to identify differentially expressed genes.
- Immunohistochemical validation on 53 PEN tissue microarrays.
Main Results:
- 66 transcripts were overexpressed in PENs, including oncogenes (MLLT10/AF10), growth factors (IGFBP3), and adhesion molecules (fibronectin).
- 119 transcripts were underexpressed, including cell cycle proteins (p21/Cip1) and metastasis suppressors (NME3).
- IGFBP3 and fibronectin overexpression correlated with metastatic PENs, while p21 and MIC2 (CD99) downregulation was confirmed.
Conclusions:
- Global gene expression profiling provides valuable insights into PEN tumorigenesis.
- Identified genes like IGFBP3 and fibronectin show potential as prognostic and therapeutic markers for pancreatic endocrine neoplasms.
