What question did this study set out to answer?

This research aims to understand how CBX2 influences extracellular vesicle biogenesis and ovarian carcinoma metastasis.

May 7, 2026npj Precision Oncology0 citationsOpen Access

Liquid-liquid phase separation of CBX2 regulates lipid raft-mediated extracellular vesicle biogenesis to facilitate ovarian carcinoma metastasis

Key Points

This research aims to understand how CBX2 influences extracellular vesicle biogenesis and ovarian carcinoma metastasis.
Identified expression patterns of CBX2 in metastatic ovarian carcinoma lesions.
Investigated the effects of CBX2 on tumor cell behavior and EV secretion.
Utilized deletion studies to assess the importance of LLPS and lipid raft remodeling.
CBX2 overexpression correlated with increased tumor cell migration and invasion.
Deletion of CBX2's disordered region halted lipid raft remodeling and EV production.
Inhibition of CBX2 phase separation led to a significant drop in EV release and reduced metastatic potential.

Abstract

Extracellular vesicles (EVs) play a vital role in ovarian carcinoma (OvCa) metastasis, yet the mechanisms regulating EV biogenesis remain unclear. Here, we identify CBX2 as a key driver of omental metastasis, with elevated expression in metastatic lesions and association with poor prognosis. CBX2 promotes tumor cell migration, invasion, and metastasis by enhancing EV secretion and pro-metastatic cargo loading through remodeling lipid rafts, cholesterol-rich membrane microdomains essential for EV formation. Deletion of the intrinsically disordered region abolishes lipid raft remodeling and multivesicular body redistribution, indicating dependence on liquid-liquid phase separation (LLPS). CBX2 also transcriptionally upregulates FLOT1 in an LLPS-dependent manner. Disruption of lipid rafts or inhibition of CBX2 phase separation markedly reduces EV production and metastatic potential. These findings reveal an LLPS-dependent mechanism linking CBX2 to lipid raft-mediated EV biogenesis and OvCa metastasis.

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