PRMT1-Mediated Translation Regulation Is a Crucial Vulnerability of Cancer

Area of Science:

• Oncology
• Molecular Biology
• Cancer Genetics

Background:

• Osteosarcomas with p53/Rb-null mutations lack effective treatments.
• Protein arginine methyltransferase 1 (Prmt1) is identified as a potential therapeutic target.

Purpose of the Study:

• To investigate the role of Prmt1 in p53/Rb-null osteosarcomas.
• To explore Prmt1's mechanism in translation control and its therapeutic potential.

Main Methods:

• shRNA screening to identify Prmt1 as a target.
• In vitro and in vivo experiments to assess Prmt1 depletion effects.
• Analysis of translation-associated pathways and protein methylation.
• Examination of human cancer cell line data (Project Achilles).

Main Results:

• Prmt1 depletion impaired tumor initiation and maintenance in p53/Rb-null osteosarcomas.
• Prmt1 regulates translation by controlling the methylation of the translation initiation complex.
• p53/Rb-null cells are sensitive to p53-induced translation stress.
• Prmt1 and translation pathways converge on shared functional networks.

Conclusions:

• Targeting Prmt1 offers a mechanistic rationale for treating osteosarcomas.
• Prmt1 inhibition and targeting associated translation pathways represent a novel therapeutic strategy for cancers with translation stress dependencies.