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Relationship between activation of epidermal growth factor receptor and cell dissociation in pancreatic cancer
Xiaodong Tan1, Hiroshi Egami, Shinji Ishikawa
1Department of Surgery II, Kumamoto University Medical School, Honjo 1-1-1, Kumamoto 860-8556, Japan. tanxd@hotmail.com
Abstract:
In our previous investigations, mitogen-activated protein kinase kinase 2 (MEK2)/extracellular signal-regulated kinase 2 (ERK2) signaling pathway was found to be correlated with the cell dissociation induced by dissociation factor (DF) in pancreatic cancer cells. In this study, the expressions of epidermal growth factor receptor (EGFR), phosphorylated EGFR (p-EGFR), and its downstream kinases MEK1/2 and ERK1/2, were analyzed to clarify the regulatory mechanism of cell dissociation in pancreatic cancer cells. Two hamster (PC-1.0 and PC-1) and two human (AsPC-1 and Capan-2) pancreatic cancer cell lines were used. Immunocytochemical study was performed using anti-EGFR, p-EGFR, phosphorylated MEK1/2 (p-MEK1/2), and phosphorylated ERK1/2 (p-ERK1/2) antibodies. DF-treatment markedly induced the expressions of EGFR, p-EGFR, p-MEK1/2, p-ERK1/2, as well as the dissociation of cell colonies in PC-1 and Capan-2 cells. In contrast, AG1478 (an EGFR inhibitor) treatment significantly induced the cell aggregation in PC-1.0 and AsPC-1 cells which usually grew as single cells, but strongly suppressed the expressions of EGFR, p-EGFR, p-MEK1/2, and p-ERK1/2. These observations demonstrate that activation of EGFR is closely involved in cell dissociation in pancreatic cancer through activating MEK/ERK signaling pathway.
Insights
Dissociation factor (DF) induces pancreatic cancer cell dissociation by activating the epidermal growth factor receptor (EGFR) and the MEK/ERK pathway. This EGFR activation is crucial for regulating cell adhesion in pancreatic cancer.
Area of Science:
- Oncology
- Cell Biology
- Molecular Signaling
Background:
- Previous studies linked the MEK2/ERK2 pathway to cell dissociation in pancreatic cancer.
- The role of epidermal growth factor receptor (EGFR) in this process remained unclear.
Purpose of the Study:
- To elucidate the regulatory mechanism of cell dissociation in pancreatic cancer.
- To investigate the involvement of EGFR and its downstream signaling in cell dissociation.
Main Methods:
- Analysis of EGFR, phosphorylated EGFR (p-EGFR), MEK1/2, and ERK1/2 expression in pancreatic cancer cell lines.
- Immunocytochemistry was employed using specific antibodies.
- Treatment with dissociation factor (DF) and an EGFR inhibitor (AG1478).
Main Results:
- DF treatment increased EGFR, p-EGFR, p-MEK1/2, and p-ERK1/2 expression, correlating with cell colony dissociation.
- AG1478 treatment induced cell aggregation and suppressed EGFR pathway activation in specific cell lines.
- EGFR activation was demonstrated to be closely involved in pancreatic cancer cell dissociation.
Conclusions:
- The epidermal growth factor receptor (EGFR) signaling pathway is a key regulator of cell dissociation in pancreatic cancer.
- EGFR activation leads to the activation of the MEK/ERK signaling cascade, promoting cell dissociation.
- Targeting the EGFR pathway may offer therapeutic strategies for pancreatic cancer.
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