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The pattern of CPP32/caspase-3 expression reflects the biological behavior of the human pancreatic duct cell tumors
1The Third Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan. ksatoh@int3.med.tohoku.ac.jp
Abstract:
Caspase-3/CPP32, a member of the Ced-3-family of cysteine proteases, is an important mediator of programmed cell death (apoptosis). Intraductal papillary-mucinous tumor of the pancreas (IPMT) is a unique tumor that grows intraductally with rare stromal invasion. However, it is not possible to distinguish noninvasive from invasive IPMT preoperatively. To examine whether caspase-3 expression reflects the biological behavior of pancreatic tumors, we investigated this enzyme expression by reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry in 22 pancreatic duct cell carcinomas (PDC) and 13 IPMT cases. Caspase-3 mRNA was overexpressed in PDC and IPMT with carcinoma when compared with normal pancreatic tissue or IPMT with adenoma. The immunoreactivity of this enzyme was predominantly found in the cytoplasm of invasive tumors (PDC and invasive IPMT). There was a significant correlation between the cytoplasmic staining and malignant grade of the tumors. In contrast, the nuclear expression of this enzyme was significantly higher in noninvasive than in invasive tumors (p = 0.0015). Cytoplasmic expression of caspase-3 may be related to the invasiveness of pancreatic tumors. In contrast, nuclear expression of this enzyme may reflect the benign biological behavior of IPMT.
Insights
Caspase-3 expression in pancreatic tumors offers insights into their behavior. Cytoplasmic caspase-3 indicates invasiveness in pancreatic duct cell carcinomas and invasive IPMT, while nuclear expression suggests non-invasive IPMT.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Programmed cell death (apoptosis) is mediated by cysteine proteases like caspase-3.
- Intraductal papillary-mucinous tumor of the pancreas (IPMT) is a unique pancreatic tumor with unpredictable invasiveness.
- Distinguishing non-invasive from invasive IPMT preoperatively remains challenging.
Purpose of the Study:
- To investigate the role of caspase-3 expression in reflecting the biological behavior of pancreatic tumors.
- To correlate caspase-3 expression patterns with tumor invasiveness and grade in pancreatic ductal cell carcinoma (PDC) and IPMT.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) was used to analyze caspase-3 mRNA levels.
- Immunohistochemistry was employed to assess caspase-3 protein expression and localization (cytoplasmic vs. nuclear).
- Analysis was performed on 22 PDC and 13 IPMT cases, including normal pancreatic tissue and IPMT with adenoma.
Main Results:
- Caspase-3 mRNA was overexpressed in pancreatic ductal cell carcinoma (PDC) and carcinoma-associated IPMT compared to normal tissue or adenoma-associated IPMT.
- Cytoplasmic caspase-3 immunoreactivity was predominantly observed in invasive tumors (PDC and invasive IPMT) and correlated with higher malignant grade.
- Nuclear caspase-3 expression was significantly higher in non-invasive IPMT compared to invasive tumors (p = 0.0015).
Conclusions:
- Cytoplasmic expression of caspase-3 may serve as a marker for the invasiveness of pancreatic tumors.
- Nuclear expression of caspase-3 might indicate the benign biological behavior of intraductal papillary-mucinous tumors (IPMT).
- Caspase-3 expression patterns could aid in differentiating between invasive and non-invasive pancreatic lesions.