UHMK1 regulates VM formation in OSCC by interacting with STMN1

Area of Science:

• Oncology
• Molecular Biology
• Cancer Research

Background:

• Oral squamous cell carcinoma (OSCC) is an aggressive malignancy with poor prognosis.
• Vasculogenic mimicry (VM), a non-endothelial blood supply, contributes to OSCC progression.
• The regulatory mechanisms of VM in OSCC require further elucidation.

Purpose of the Study:

• To investigate the association between U2AF homologous motif kinase 1 (UHMK1) expression and VM formation in OSCC.
• To explore the molecular mechanisms by which UHMK1 regulates VM development.
• To identify potential therapeutic targets for OSCC.

Main Methods:

• Immunohistochemistry (IHC) to assess UHMK1 and VM expression in OSCC tissues.
• In vitro experiments to evaluate the effect of UHMK1 knockdown on VM formation.
• Bioinformatics prediction and co-immunoprecipitation (co-IP) assays to identify UHMK1 interacting proteins.
• Western blotting and ubiquitination assays to investigate protein stabilization mechanisms.
• Analysis of the PI3K/AKT/mTOR signaling pathway.

Main Results:

• UHMK1 upregulation in OSCC significantly correlates with VM structures and is associated with poor clinical outcomes.
• UHMK1 knockdown suppresses VM formation in OSCC cells.
• UHMK1 interacts with and stabilizes stathmin1 (STMN1) by inhibiting its degradation.
• UHMK1 and STMN1 jointly activate the PI3K/AKT/mTOR pathway, regulating VM formation.

Conclusions:

• UHMK1 plays a critical role in promoting VM formation in OSCC through the UHMK1-STMN1 axis.
• The UHMK1-STMN1 interaction provides novel insights into OSCC tumor microenvironment.
• Targeting the UHMK1-STMN1 pathway may represent a potential anti-angiogenic therapeutic strategy for OSCC.