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AACR-NCI-EORTC Poster C102: Understanding Anti-PD-1 MOA Through Immune Cell Depletion

Investigating Mechanisms of Action (MOA) of Anti-PD-1 Treatment by Systematic Depletion of Different Immune Cells in Syngeneic Models

Ying Jin, Jan Muntel*, Haochen Yu*, Kristina Beeler*, Roland Bruderer*, Yongli Shan, Annie Xiaoyu An, Davy Xuesong Ouyang, Henry Qixiang Li
*Biognosys AG, Zurich, Switzerland
AACR-NCI-EORTC Poster C102: Understanding Anti-PD-1 MOA Through Immune Cell Depletion
To optimize immune checkpoint inhibitor use it’s important to fully understand which immune cell populations mediate response. For example, while it’s well known that anti-PD-1 antibodies work via activation of cytotoxic T cells, the contribution of other immune cell populations are not well defined.

To understand how different immune cell lineages impact anti-PD-1 efficacy, we combined anti-PD-1 treatment with different immune cell population depletion in MC38, CT-26, EMT6, and Hepa 1-6 murine syngeneic models. Proteomic analysis was also performed on tumor samples from selected MC38 and Hepa 1-6 model subgroups.

Read this Poster to Discover:

  • That CD8+ T cell depletion severely weakens or completely diminishes anti-PD-1 efficacy, while CD4+ T cell depletion induces contrary effects across models

  • How proteomic data analysis uncovers part of the MOA leading to differences in CD4 depletion between MC38 and Hepa 1-6 models

  • How immune cell lineages act differently upon anti-PD-1 blockade release dependent on specific tumor microenvironments

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