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Pancreatic tumor pathogenesis reflects the causative genetic lesion
E P Sandgren1, C J Quaife, A G Paulovich
1Laboratory of Reproductive Physiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104.
Summary
Targeting c-myc in mouse pancreas causes mixed acinar/ductal tumors, unlike other oncogenes. This suggests transformed acinar cells may initiate human pancreatic cancer.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Pancreatic ductal adenocarcinoma (PDAC) is a leading cause of cancer death.
- The cellular origin and early oncogenic events driving PDAC remain incompletely understood.
- Understanding these early events is crucial for developing effective prevention and treatment strategies.
Purpose of the Study:
- To investigate the role of c-myc in pancreatic tumorigenesis.
- To determine if oncogenic alterations in specific pancreatic cell types influence tumor development and histology.
- To explore the potential contribution of acinar cells to the genesis of pancreatic cancer.
Main Methods:
- Generation of transgenic mice with targeted c-myc expression in pancreatic acinar cells.
- Histopathological analysis of pancreatic tumors developed in these mice.
- Observation of tumor progression and cellular changes over time.
Main Results:
- Transgenic mice developed mixed acinar/ductal pancreatic adenocarcinomas between 2 and 7 months of age.
- This contrasts with tumors induced by SV40 T antigen or activated Ras, which were exclusively acinar-like.
- Transformed acinar-derived cells were observed within islets during early pathology, suggesting hormonal influence.
Conclusions:
- The initial oncogenic alteration significantly influences subsequent tumor pathogenesis.
- Transformed pancreatic acinar cells may contribute to the development of human pancreatic ductal adenocarcinomas.
- Further research into acinar cell transformation is warranted for understanding and treating pancreatic cancer.