Menin represses tumorigenesis via repressing cell proliferation.

Area of Science:

• Endocrinology
• Molecular Biology
• Genetics

Background:

• Multiple endocrine neoplasia type 1 (MEN1) arises from mutations in the MEN1 tumor suppressor gene, encoding the nuclear protein menin.
• Menin plays a crucial role in suppressing tumorigenesis across endocrine and non-endocrine tissues.
• Menin's regulation of cell proliferation is a key mechanism in its tumor-suppressive function.

Purpose of the Study:

• To review the diverse mechanisms by which menin inhibits cell proliferation.
• To elucidate how menin's regulation of cell proliferation contributes to the suppression of MEN1.

Main Methods:

• Literature review focusing on menin's interactions and pathway involvement.
• Analysis of menin's roles in gene transcription, signaling pathways, and cell cycle progression.

Main Results:

• Menin inhibits proliferation by interacting with histone-modifying enzymes (e.g., MLL, EZH2, HDACs) to regulate gene transcription.
• Menin interacts with transcription factors (e.g., JunD, NF-κB, PPARγ, VDR) to modulate gene expression.
• Menin influences TGF-β and Wnt/β-catenin signaling pathways and represses pro-proliferative factors (e.g., IGFBP-2, IGF2, PTHrP).
• Menin impacts cell cycle progression to inhibit proliferation.

Conclusions:

• Menin employs multiple, interconnected mechanisms to inhibit cell proliferation.
• Understanding these mechanisms is vital for comprehending how menin suppresses MEN1.
• Menin's multifaceted role in cell proliferation control highlights its significance as a tumor suppressor.