Targeting HECTD3-IKKα axis inhibits inflammation-related metastasis

Area of Science:

• Oncology
• Cell Biology
• Molecular Biology

Background:

• Metastasis is the primary cause of cancer mortality.
• Systemic inflammation post-surgery can enhance tumor cell spread and adhesion.
• Current interventions to prevent distant metastasis are limited.

Purpose of the Study:

• To investigate the role of HECTD3 in endothelial cells (ECs) in hematogenous metastasis.
• To identify potential therapeutic targets for preventing cancer metastasis.

Main Methods:

• Utilized mouse models and human umbilical vein endothelial cells (HUVECs).
• Assessed the impact of HECTD3 deficiency on adhesion molecule expression (VCAM-1, ICAM-1, E-selectin).
• Investigated the mechanism involving IKKα ubiquitination, nuclear localization, and kinase activity.

Main Results:

• HECTD3 deficiency in ECs reduced tumor metastasis in mouse models.
• Depletion of HECTD3 downregulated adhesion molecules and inhibited tumor cell adhesion to ECs.
• HECTD3 promotes IKKα stabilization and activity, enhancing NF-κB transcription, which drives metastasis.

Conclusions:

• The HECTD3-IKKα axis plays a crucial role in promoting hematogenous tumor metastasis.
• Targeting HECTD3 or IKKα in the endothelium presents a potential strategy for metastasis prevention.