Acta Anatomica Sinica ›› 2022, Vol. 53 ›› Issue (4): 498-506.doi: 10.16098/j.issn.0529-1356.2022.04.013

• Cancer Biology • Previous Articles     Next Articles

PI3K inhibitor ZSTK474 enhancing the antitumor of vesicular stomatitis virus Δ51 against osteosarcoma

LIU  Li-zhu1  LI  Chao-yi1*  LIN  Shi-wei1  QU  Ye1  TANG Qiang 2#br#   

  1. 1.Department of Trauma Surgery, the Second Affiliated Hospital of Hainan Medical College, Haikou 570311,China; 2.Hainan Key Laboratory of Oncology and Intervention, Hainan Medical College, Haikou 571199, China
  • Received:2020-08-10 Revised:2020-11-08 Online:2022-08-06 Published:2022-09-11
  • Contact: LI Chao-yi E-mail:li35499015@126.com

Abstract:

Objective  To explore whether PI3K inhibitor combined with oncolytic virus can play an effective oncolytic effect on osteosarcoma.      Methods  The cytotoxicity to tumor cells was detected by MTT method, and the mechanism of enhancing the anti-tumor activity was explored by observation of the swelling of endoplasmic reticulum using electron microscope and the expression of apoptosis-related proteins using Western blotting. The tumor clearance ability of the combination of the PI3k inhibitor ZSTK474 and vesicular stomatitis virus Δ51 (VSVΔ51) was verified by anti-tumor experiment  in vivo. The apoptosis of tumor cells was verified by immunohistochemistry.      Results  PI3K inhibitor could be used as sensitizers of oncolytic VSVΔ51, and confirmed that they promoted the strong apoptosis of osteosarcoma cells by aggravating the stress of endoplasmic reticulum in tumor cells (P<0.01). In vivo experiments also showed that PI3K inhibitors combined with VSVΔ51 could significantly promote the oncolytic effect of osteosarcoma (P<0.001), and this combination therapy enhanced the infiltration of immune cells in the tumor (P<0.001).       Conclusion  PI3K inhibitors combined with oncolytic virus is a potential therapy for osteosarcoma.

Key words: Osteosarcoma, Oncolytic virus, Vesicular stomatitis virus Δ51, Phosphatidylinositol 3-kinase inhibitor, Western blotting, Mouse

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