MAGE-A4-Responsive Plasma Cells Promote Non-Small Cell Lung Cancer
Armstrong, D.; Chang, C.-Y.; Hong, M. J.; Green, L. K.; Hudson, W.; Shen, Y.; Song, L.-Z.; Jammi, S.; Casal, B.; Creighton, C. J.; Carisey, A.; Zhang, X.; McKenna, N.; Kang, S.; Lee, H.-S.; Corry, D.; Kheradmand, F.
Show abstract
Adaptive immunity is critical to eliminate malignant cells, while multiple tumor-intrinsic factors can alter this protective function. Melanoma antigen-A4 (MAGE-A4), a cancer-testis antigen, is expressed in several solid tumors and correlates with poor survival in non-small cell lung cancer (NSCLC), but its role in altering antitumor immunity remains unclear. We found that expression of MAGE-A4 was highly associated with the loss of PTEN, a tumor suppressor, in human NSCLC. Here we show that constitutive expression of human MAGE-A4 combined with the loss of Pten in mouse airway epithelial cells results in metastatic adenocarcinoma enriched in CD138+ CXCR4+ plasma cells, predominantly expressing IgA. Consistently, human NSCLC expressing MAGE-A4 showed increased CD138+ IgA+ plasma cell density surrounding tumors. The abrogation of MAGE-A4-responsive plasma cells (MARPs) decreased tumor burden, increased T cell infiltration and activation, and reduced CD163+CD206+ macrophages in mouse lungs. These findings suggest MAGE-A4 promotes NSCLC tumorigenesis, in part, through the recruitment and retention of IgA+ MARPs in the lungs.
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