FXR Regulates Intestinal Cancer Stem Cell Proliferation

Area of Science:

• Gastroenterology
• Oncology
• Molecular Biology

Background:

• Increased intestinal bile acids (BAs) are linked to colorectal cancer (CRC) risk.
• Dietary factors and WNT signaling pathway mutations contribute to CRC development.

Purpose of the Study:

• To investigate how altered BA profiles, influenced by diet and WNT signaling, promote CRC.
• To explore the role of farnesoid X receptor (FXR) in CRC progression and its potential as a therapeutic target.

Main Methods:

• Analysis of BA profiles in the context of high-fat diet and APC mutation.
• Investigating the effects of specific BAs on Lgr5-expressing (Lgr5+) cancer stem cells.
• Assessing the impact of intestinal FXR activation on Lgr5+ cell growth and CRC progression.

Main Results:

• A high-fat diet combined with APC mutation alters BA profiles, driving malignant transformation in Lgr5+ cells.
• Bile acids like T-βMCA and DCA antagonize FXR, inducing proliferation and DNA damage in Lgr5+ cells.
• Selective intestinal FXR activation inhibits Lgr5+ cell growth and restricts CRC progression.

Conclusions:

• FXR plays a critical role in regulating intestinal self-renewal and BA homeostasis.
• FXR is a potential therapeutic target for colorectal cancer, particularly in cases involving dietary factors and WNT pathway dysregulation.