RHBDD1 upregulates EGFR via the AP-1 pathway in colorectal cancer

Area of Science:

• Oncology
• Molecular Biology
• Cell Signaling

Background:

• Previous research established RHBDD1's role in activating the EGFR signaling pathway, promoting colorectal cancer growth.
• RHBDD1 is implicated in cancer progression, but its precise mechanism in regulating EGFR expression requires further elucidation.

Purpose of the Study:

• To investigate the regulatory mechanism of RHBDD1 on EGFR expression in colorectal cancer.
• To determine the role of the AP-1 pathway and c-Jun in RHBDD1-mediated EGFR regulation.

Main Methods:

• RHBDD1 knockdown and inactivation in colorectal cancer cells.
• Overexpression and knockdown experiments for c-Jun.
• Western blotting to assess protein expression (EGFR, c-Jun).
• Animal tumor models and tissue microarray assays.

Main Results:

• RHBDD1 knockdown/inactivation led to decreased EGFR and c-Jun protein levels.
• c-Jun overexpression rescued EGFR expression in RHBDD1-inactivated cells.
• RHBDD1 restoration increased EGFR, an effect blocked by c-Jun knockdown.
• EGFR and c-Jun were downregulated in animal models with RHBDD1 knockdown.
• A positive correlation between RHBDD1 and EGFR was observed in patient tissues.

Conclusions:

• RHBDD1 promotes colorectal cancer growth by upregulating EGFR expression.
• RHBDD1 stimulates EGFR expression through the AP-1 pathway, mediated by c-Jun.
• RHBDD1 and EGFR are potential therapeutic targets in colorectal cancer.