Low-dose Anti-VEGFR2 Therapy Promotes Anti-tumor Immunity in Lung Adenocarcinoma by Down-regulating the Expression of Layilin on Tumor-infiltrating CD8T Cells
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Purpose: Our study intended to explore how low-dose anti-angiogenic drugs affected anti-tumor immunity of tumor-infiltrating exhausted CD8T cells and achieved better clinical response when combined with immunotherapy. We set out to find potential targets or predictive biomarker on CD8T cells for immunotherapy.
Methods: We tested different doses of anti-VEGFR2 antibody combined with anti-PD1 antibody to treat LUAD in vivo and analyzed tumor-infiltrating CD8T cells by flow cytometry. CD8T cells overexpressing LAYN were co-cultured with LA795 cell lines to identify the function of LAYN in CD8T cells. We also analyzed clinical samples from advanced LUAD patients treated with anti-angiogenesis therapy combined with immunotherapy.
Results: Low-dose anti-VEGFR2 antibody combined with anti-PD1 antibody treatment delayed tumor growth and prolonged the survival time of tumor-bearing mice. The number of tumor-infiltrating CD8T cells was reduced and the expression of LAYN was down-regulated in tumor-infiltrating CD8T cells in the low-dose anti-VEGFR2 combination group. It was found that LAYN inhibited the killing function of CD8T cells. In patients with advanced LUAD who received anti-angiogenesis therapy combined with immunotherapy, the LAYNCD8T cell subpopulation in good responders was significantly higher than that in poor responders. Furthermore, we demonstrated the expression of LAYN was regulated by upstream transcription factor NR4A1.
Conclusion: Low-dose anti-VEGFR2 antibody combined with anti-PD1 antibody therapy promoted anti-tumor immunity and the downregulation of LAYN in tumor-infiltrating CD8T cells played an important role in this process. These findings had implications for improving the efficacy of immune checkpoint blockade therapy and further optimized clinical treatment guidelines in advanced LUAD.
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