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    Melanoma antigen-A4 (MAGE-A4) promotes non-small cell lung cancer (NSCLC) by recruiting IgA-producing plasma cells. Targeting these MAGE-A4-responsive plasma cells (MARPs) reduced tumor growth and enhanced anti-tumor immunity.

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    Area of Science:

    • Immunology
    • Oncology

    Background:

    • Adaptive immunity is crucial for eliminating cancer cells, but tumors possess intrinsic factors that can impair this response.
    • Melanoma antigen-A4 (MAGE-A4), a cancer-testis antigen, is linked to poor survival in non-small cell lung cancer (NSCLC), yet its precise role in modulating anti-tumor immunity is not fully understood.
    • MAGE-A4 expression in human NSCLC is strongly associated with the loss of the tumor suppressor PTEN.

    Purpose of the Study:

    • To investigate the role of MAGE-A4 in altering anti-tumor immunity within the context of NSCLC.
    • To elucidate the mechanism by which MAGE-A4 influences the tumor microenvironment and immune cell populations.

    Main Methods:

    • Constitutive expression of human MAGE-A4 and loss of Pten were induced in mouse airway epithelial cells to model NSCLC.
    • Immunohistochemistry and flow cytometry were used to analyze immune cell populations (CD138+, CXCR4+, IgA+, CD163+, CD206+) in mouse models and human NSCLC tissues.
    • The impact of abrogating MAGE-A4-responsive plasma cells (MARPs) on tumor burden, T cell infiltration/activation, and macrophage populations was assessed.

    Main Results:

    • MAGE-A4 expression combined with Pten loss in mice led to metastatic adenocarcinoma enriched in CD138+ CXCR4+ IgA+ plasma cells.
    • Human NSCLC expressing MAGE-A4 exhibited increased density of CD138+ IgA+ plasma cells around tumors.
    • Abrogation of MARPs in mice reduced tumor burden, enhanced T cell responses, and decreased pro-tumorigenic macrophages.

    Conclusions:

    • MAGE-A4 contributes to NSCLC tumorigenesis, at least partly by recruiting and retaining IgA+ MARPs in the lung microenvironment.
    • These findings highlight a novel mechanism of immune evasion in NSCLC mediated by MAGE-A4 and IgA+ plasma cells.
    • Targeting MARPs represents a potential therapeutic strategy for NSCLC, aiming to restore anti-tumor immunity.