PRRX1-TOP2A interaction is a malignancy-promoting factor in human malignant peripheral nerve sheath tumours

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Paired related-homeobox 1 (PRRX1) is a transcription factor involved in development.
• PRRX1 is increasingly recognized for its role in cancer prognosis.
• The precise molecular mechanisms of PRRX1 in cancer malignancy are not fully understood.

Purpose of the Study:

• To investigate the role of PRRX1 in Malignant Peripheral Nerve Sheath Tumours (MPNSTs).
• To identify molecular interactions of PRRX1 in cancer.
• To explore therapeutic strategies targeting PRRX1.

Main Methods:

• Immunohistochemistry to assess PRRX1 expression and patient prognosis.
• In vitro MPNST models with PRRX1 gene modulation.
• Co-immunoprecipitation, mass spectrometry, and RNA-seq to identify PRRX1 interacting proteins.

Main Results:

• High PRRX1 expression correlates with poor prognosis in MPNST patients.
• PRRX1 knockdown reduces MPNST cell tumorigenicity.
• PRRX1 directly interacts with TOP2A, promoting epithelial-mesenchymal transition and key oncogenic pathways (mTORC1, KRAS, SRC).

Conclusions:

• The PRRX1-TOP2A interaction is a critical driver of MPNST malignancy.
• Etoposide's anti-cancer effect may involve inhibiting the PRRX1-TOP2A interaction.
• Targeting the PRRX1-TOP2A interaction presents a novel therapeutic avenue for PRRX1-high cancers.