Add time:08/04/2019         Source:sciencedirect.com

Following the FDA approval of three monoclonal antibodies of PD-1/PD-L1, this pathway has become a promising target for cancer treatment. Currently small-molecule inhibitors have not been extensively investigated, and appropriate screening methods for such inhibitors are urgently required. In this study, surface plasmon resonance (SPR) technology was used to evaluate the affinity and competitive inhibition of nine caffeoylquinic acid compounds (CQAs) against PD-1/PD-L1. As a result, four small molecules including 1-CQA, 3-CQA, 4-CQA and 5-CQA were determined as PD-1/PD-L1 inhibitors. This study provided an efficient method for screening small-molecule inhibitors targeting PD-1/PD-L1 pathway.

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