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Claudin-4: a new target for pancreatic cancer treatment using Clostridium perfringens enterotoxin
1Department of Internal Medicine I, University Medical Center, University of Ulm, Ulm, Germany.
Background & Aims:
Recently, several members of the claudin family have been identified as integral constituents of tight junctions. Using expression profiling, we previously found claudin-4 to be overexpressed in pancreatic cancer. Because claudin-4 has been described as a receptor for the cytotoxic Clostridium perfringens enterotoxin (CPE), we investigated the effect of CPE on pancreatic cancer cells.
Methods:
Expression of claudin-4 was analyzed by Northern blots. In vitro toxicity of CPE was determined by trypan blue exclusion and the (86)Rb-release assay. The in vivo effect of CPE was studied in claudin-4-expressing nude mouse xenografts of the Panc-1 cell line.
Results:
Expression analyses showed that claudin-4 was overexpressed in most pancreatic cancer tissues and cell lines and several other gastrointestinal tumors. CPE led to an acute dose-dependent cytotoxic effect, restricted to claudin-4-expressing cells and dependent on claudin-4 expression levels. Furthermore, transforming growth factor beta was identified as a negative modulator of both claudin-4 expression and susceptibility to CPE. In vivo, intratumoral injections of CPE in Panc-1 xenografts led to large areas of tumor cell necrosis and significant reduction of tumor growth.
Conclusions:
Our findings suggest that targeting claudin-4-expressing tumors with CPE represents a promising new treatment modality for pancreatic cancer and other solid tumors.
Insights
Clostridium perfringens enterotoxin (CPE) effectively targets and kills pancreatic cancer cells that overexpress claudin-4. This research suggests CPE is a promising new treatment for pancreatic cancer and other claudin-4-positive tumors.
Area of Science:
- Oncology
- Molecular Biology
- Gastroenterology
Background:
- Claudins are integral tight junction proteins.
- Claudin-4 is overexpressed in pancreatic cancer.
- Claudin-4 acts as a receptor for Clostridium perfringens enterotoxin (CPE).
Purpose of the Study:
- To investigate the effect of CPE on pancreatic cancer cells.
- To evaluate CPE as a potential therapeutic agent for claudin-4-expressing tumors.
Main Methods:
- Claudin-4 expression analysis using Northern blots.
- In vitro cytotoxicity assays (trypan blue exclusion, 86Rb-release).
- In vivo studies using claudin-4-expressing nude mouse xenografts.
Main Results:
- Claudin-4 is overexpressed in most pancreatic cancer tissues and cell lines, as well as other gastrointestinal tumors.
- CPE demonstrated dose-dependent cytotoxicity specifically in claudin-4-expressing cells.
- Transforming growth factor beta negatively modulated claudin-4 expression and CPE susceptibility.
- Intratumoral CPE injections in vivo significantly reduced tumor growth and caused necrosis.
Conclusions:
- Targeting claudin-4-expressing tumors with CPE is a promising therapeutic strategy.
- CPE shows potential as a novel treatment for pancreatic cancer and other solid tumors.
