Abstract:
OBJECTIVE:To evaluate the antitumor effects of fusion protein hGrB-TV of human granzyme B (hGrB) and truncated vascular endothelial growth factor (tVEGF) on human oral squamous cell carcinoma (OSCC) in vitro and in vivo. METHODS:The fusion protein hGrB-TV was expressed and purified from E. coli bacteria by affinity chromatography. The cytotoxcity of hGrB-TV on VEGFR-2 (Flk-1)(+) OSCC cells was analyzed in vitro. The antitumor therapeutic study was conducted on OSCC xenografts in vivo. RESULTS:The purified hGrB-TV fusion protein was selectively internalized into VEGFR-2 (Flk-1)(+) OSCC cells and endothelial cells. It can cleave inactive caspase 3 into its active p20 form. The hGrB-TV showed dose-dependent cytotoxicity on VEGFR-2(+) SCC-9 cells. The morphological changes and cytolysis were appeared within dozen minutes. However, no cytotoxicity was observed on VEGFR-2(-) cells. The hGrB alone or tVEGF alone did not have any toxicity on SCC-9 cells. In addition, hGrB-TV treatment completely destroyed the vasculature of the chick chorioallantoic membrane (CAM) in vivo and consequently led to chick embryo development arrest. Most importantly, the fusion protein hGrB-TV inhibited tumor angiogenesis and growth of human OSCC xenografts in nude mice without any apparent toxicity. CONCLUSIONS:The fusion protein hGrB-TV specifically inhibits angiogenesis and tumor growth of OSCC; hGrB-TV is a powerful and safe therapeutic molecule for tumor therapy.
journal_name
Oral Disjournal_title
Oral diseasesauthors
Lv XZ,Zheng MY,Lin ZQ,Zhao M,Wang H,Zeng WSdoi
10.1111/odi.12522subject
Has Abstractpub_date
2016-10-01 00:00:00pages
688-96issue
7eissn
1354-523Xissn
1601-0825journal_volume
22pub_type
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