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KLF4 deletion alters gastric cell lineage and induces MUC2 expression
Abstract:
Gastric cancer is one of the most common types of cancer in the world, particularly in underdeveloped countries. The mechanism of gastric cancer is less understood compared with other types of gastrointestinal (GI) cancers. Krüppel-like factor 4 (KLF4) is a zinc-finger transcription factor and is a potential tumor suppressor in GI cancers. In this study, we have generated two mouse models, Rosa-Cre;Klf4(fl/fl) and Lgr5-Cre;Klf4(fl/fl). KLF4 was deleted by Rosa-Cre in the gastric epithelia cells or by Lgr5-Cre in the antral stem cells in the adult mice. KLF4 deletion resulted in increased proliferating cells and decreased pit mucous cells. Surprisingly, the intestinal goblet cell marker, MUC2, which is not expressed in normal gastric tissues, was strongly induced at the base of the KLF4-deleted antral glands. To understand the clinical relevance of these findings, we analyzed the expression of KLF4 and MUC2 in human gastric cancer. In a subset of human gastric cancer, the expression of KLF4 is negatively associated with MUC2 expression. In conclusion, KLF4 is essential for normal homeostasis of antral stem cells; loss of KLF4 and expression of MUC2 could be important markers for gastric cancer diagnosis.
Insights
Loss of Krüppel-like factor 4 (KLF4) in mouse stomachs increases cell proliferation and induces MUC2, an intestinal marker. This KLF4 loss and MUC2 expression correlate with human gastric cancer, suggesting diagnostic potential.
Area of Science:
- Gastroenterology
- Oncology
- Molecular Biology
Background:
- Gastric cancer is a prevalent global malignancy with incompletely understood mechanisms.
- Krüppel-like factor 4 (KLF4), a transcription factor, is implicated as a tumor suppressor in gastrointestinal cancers.
Purpose of the Study:
- To investigate the role of KLF4 in gastric homeostasis and its potential link to gastric cancer development.
- To explore the clinical relevance of KLF4 and MUC2 expression in human gastric cancer.
Main Methods:
- Generated mouse models (Rosa-Cre;Klf4(fl/fl) and Lgr5-Cre;Klf4(fl/fl)) to delete KLF4 in gastric epithelia and antral stem cells.
- Analyzed cellular changes, including proliferation and cell type markers, following KLF4 deletion.
- Examined KLF4 and MUC2 expression in human gastric cancer tissues.
Main Results:
- KLF4 deletion in mice led to increased cell proliferation and reduced pit mucous cells in the gastric antrum.
- Intestinal goblet cell marker MUC2 was unexpectedly induced in KLF4-deleted gastric glands.
- A negative association between KLF4 and MUC2 expression was observed in a subset of human gastric cancers.
Conclusions:
- KLF4 is crucial for maintaining normal antral stem cell homeostasis.
- Loss of KLF4 and concurrent MUC2 induction may serve as significant biomarkers for gastric cancer diagnosis.
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