Shikonin improves the effectiveness of PD-1 blockade in colorectal cancer by enhancing immunogenicity via Hsp70 upregulation

Author:

Chen Jinghua,Liu Jie,Liu Xiaolin,Wang Jun,Wang Xiumei,Ye Xin,Xie QiORCID,Liang Jing,Li Yan

Abstract

Abstract Background PD-1 blockade has shown impressive clinical outcomes in colorectal cancers patients with high microsatellite instability (MSI-H). However, the majority of patients with colorectal cancer who present low microsatellite instability (MSI-L) or stable microsatellites (MSS) show little response to PD-1 blockade therapy. Here, we have demonstrated that Shikonin (SK) could induce cell death of CT26 cells via classically programmed and immunogenic pathways. Methods and results SK promoted the membrane exposure of calreticulin and upregulated the expression of heat shock protein 70 (Hsp70). The upregulation of Hsp70 was dependent on ROS induced by SK and silencing of PKM2 in CT26 cells reverts ROS upregulation. Besides, SK synergizes with PD-1 blockade in CT26 tumor mice model, with the increase of intramural DC cells and CD8T cells. The expression of Hsp70 in tumor tissue was also increased in combinational SK plus αPD-1 therapy group. Conclusions Our study elucidated the potential role of ‘Shikonin-PKM2-ROS-Hsp70’ axis in the promotion of efficacy of PD-1 blockade in CRC treatments, providing a potential strategy and targets for improving the efficacy of PD-1 blockade in colorectal cancer.

Funder

Shandong Provincial Natural Science Foundation

the Major Science and Technology Innovation Project of Shandong Province

Traditional Chinese Medicine Science and Technology Development Plan of Shandong Province

Shandong Provincial Qianfoshan Hospital

Publisher

Springer Science and Business Media LLC

Subject

Genetics,Molecular Biology,General Medicine

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