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The epidermal growth factor receptor in human pancreatic cancer
N R Lemoine1, C M Hughes, C M Barton
1Molecular Pathology Laboratory, Hammersmith Hospital, London, U.K.
Abstract:
The epidermal growth factor receptor (EGFR) and its ligands are thought to be important in the control of proliferation of many epithelial systems, including the exocrine pancreas. Abnormalities in expression of two of the known ligands of the EGFR, transforming growth factor alpha and epidermal growth factor, occur frequently in ductal adenocarcinoma of the human pancreas. We have examined an archival series of cases of pancreatic pathology for expression of the EGFR using the anti-EGFR antiserum 12E and found that there is almost ubiquitous overexpression of EGFR in pancreatic cancer and in chronic pancreatitis. Southern blot analysis showed no evidence of amplification or rearrangement of the EGFR gene. We conclude that an autocrine loop involving the EGFR system may be involved in the genesis of both neoplasia and reactive hyperplasia of pancreatic ductal epithelium.
Insights
Epidermal growth factor receptor (EGFR) is overexpressed in pancreatic cancer and chronic pancreatitis. This suggests an autocrine loop involving EGFR may drive pancreatic ductal epithelial growth in both conditions.
Area of Science:
- Oncology
- Gastroenterology
- Cell Biology
Background:
- Epidermal growth factor receptor (EGFR) signaling is crucial for epithelial proliferation.
- Aberrant expression of EGFR ligands, such as transforming growth factor alpha and epidermal growth factor, is common in pancreatic ductal adenocarcinoma.
- The role of EGFR in pancreatic pathology requires further elucidation.
Purpose of the Study:
- To investigate the expression of EGFR in various pancreatic pathologies, including pancreatic cancer and chronic pancreatitis.
- To determine if genetic alterations (amplification or rearrangement) of the EGFR gene are associated with its overexpression.
- To explore the potential involvement of an EGFR autocrine loop in the pathogenesis of pancreatic ductal epithelium.
Main Methods:
- Utilized archival cases of pancreatic pathology.
- Employed immunohistochemistry with anti-EGFR antiserum 12E to assess EGFR expression.
- Performed Southern blot analysis to detect EGFR gene amplification or rearrangement.
Main Results:
- Demonstrated nearly ubiquitous overexpression of EGFR in pancreatic cancer tissues.
- Observed widespread EGFR overexpression in chronic pancreatitis cases as well.
- Found no evidence of EGFR gene amplification or rearrangement via Southern blot analysis.
Conclusions:
- EGFR is significantly overexpressed in both pancreatic cancer and chronic pancreatitis.
- The overexpression of EGFR in these conditions is not due to gene amplification or rearrangement.
- An autocrine loop involving the EGFR system is implicated in the development of pancreatic neoplasia and reactive hyperplasia.