OPN Promotes Hepatocellular Carcinoma Progression Through the p65/c-Myc/CD155 Axis by Suppressing CD8+ T Cell
Jincun Fang1, Liwei Liu1, Zhiying He1
1Department of Tumor Hematology, Affiliated Hospital Group of Guangdong Medical University Panyu He Xian Memorial Hospital/Panyu Women and Children's Medical Center, Guangdong Medical University (Guangzhou Panyu District Maternal and Child Health Hospital), Guangzhou, China.
Introduction:
The immunosuppressive microenvironment of hepatocellular carcinoma (HCC) is shaped by multiple oncogenic pathways, but howosteopontin (OPN), a molecule frequently overexpressed in HCC, regulates anti-tumor immunity remains unclear.
Methods:
To define the mechanism by which OPN modulates the HCC immune microenvironment, with a focus on its regulation of CD155 and its impact on CD8+ T-cell - mediated anti-tumor responses.
Results:
We identified that OPN activates the p65/NF-κB - c-Myc/CD155 signaling axis, leading to robust upregulation of CD155 and impaired intratumoral CD8+ T-cell infiltration and effector activity. These immunosuppressive effects occurred independently of changes in tumor stemness markers or Treg accumulation. Genetic suppression of p65 abrogated OPN-induced CD155 expression and mitigated tumor progression in vivo, demonstrating the pathway's functional requirement.
Discussion:
OPN drives HCC progression by suppressing CD8+ T-cell immunity through the NF-κB (p65)/c-Myc/CD155 axis. Targeting this pathway may enhance anti-tumor immunity and represents a promising therapeutic strategy for HCC.
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