This recombinant monoclonal antibody is developed as a research-grade biosimilar to SHR-1901, targeting PDCD1 (Programmed Cell Death 1, also known as PD-1), a critical immune checkpoint receptor expressed primarily on activated T cells, B cells, and natural killer cells. PDCD1 functions as a negative regulator of immune responses by binding to its ligands PD-L1 and PD-L2, which triggers inhibitory signaling pathways that suppress T cell proliferation, cytokine production, and cytotoxic activity. This immune checkpoint mechanism plays a vital role in maintaining self-tolerance and preventing autoimmunity, but is frequently exploited by tumor cells to evade immune surveillance, making PDCD1 a key target in cancer immunology research and therapeutic development.
SHR-1901 is an investigational PD-1 antibody currently in the early stage of clinical research. As a PD-1 inhibitor, SHR-1901 aims to activate T cells by blocking the PD-1/PD-L1 pathway, thereby restoring the anti-tumor immune response. This biosimilar reagent provides researchers with a valuable tool for investigating PDCD1-mediated immune regulation, studying checkpoint inhibitor mechanisms, exploring tumor microenvironment dynamics, and developing novel immunotherapeutic strategies across various cancer models and immunological research applications.
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