Tumor Suppression through Angiogenesis Inhibition by SUIT-2 Pancreatic Cancer Cells Genetically Engineered to Secrete NK4

• Published in: Clinical cancer research Vol. 8; no. 10; pp. 3243 - 3249
• Main Authors: SAIMURA, Michiyo, NAGAI, Eishi, MIZUMOTO, Kazuhiro, MAEHARA, Naoki, MINAMISHIMA, Yohji A, KATANO, Mitsuo, MATSUMOTO, Kunio, NAKAMURA, Toshikazu, TANAKA, Masao
• Format: Journal Article
• Language: English
• Published: Philadelphia, PA American Association for Cancer Research 01-10-2002
• Subjects: Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy; Animals; Applied cell therapy and gene therapy; Biological and medical sciences; Cell Division - drug effects; Cell Movement - drug effects; Disease Progression; Female; Genetic Therapy; Growth Inhibitors - pharmacology; Hepatocyte Growth Factor - biosynthesis; Hepatocyte Growth Factor - genetics; Humans; Immunoenzyme Techniques; In Vitro Techniques; Medical sciences; Mice; Mice, Inbred BALB C; Mice, Nude; Mitogens; Neoplasm Invasiveness; Neovascularization, Pathologic - therapy; Pancreatic Neoplasms - metabolism; Pancreatic Neoplasms - pathology; Pancreatic Neoplasms - therapy; Transfection; Transfusions. Complications. Transfusion reactions. Cell and gene therapy; Tumor Cells, Cultured; Antineoplastic agent; Cell proliferation; Angiogenesis; Established cell line; Antagonist; Neovascularization; Antiangiogenic agent; Pancreas; Tumor cell; Pancreatic disease; Human; Hepatocyte growth factor; Rodentia; Malignant tumor; Gene expression; In vitro; Biological activity; Genetic transfer; In vivo; Vertebrata; Mammalia; Treatment; Mouse; Animal; Digestive diseases; Gene therapy
• ISSN: 1078-0432; 1557-3265

NK4, composed of the N-terminal hairpin and subsequent four-kringle domains of hepatocyte growth factor (HGF), acts not only
as a competitive antagonist of HGF but also as an inhibitor of angiogenesis. By studying the antitumor effect of NK4, we evaluated
the potential of gene therapy with NK4 as a treatment for pancreatic cancer. Expression vector pcDNA3-NK4 containing NK4 cDNA
was used to transfect human pancreatic cancer cell line SUIT-2. Although the established NK4 transfectant continuously expressed
NK4 protein, the expression was shown by migration assay to be insufficient to antagonize HGF in vitro . Proliferation of the NK4 transfectant did not differ significantly from that of a mock transfectant. In vivo , we used models of orthotopic implantation and liver metastasis to transplant NK4-transfected clone or mock-transfected clone
into nude mice. Cell proliferation in vivo , evaluated by immunohistochemical staining of proliferating cell nuclear antigen, did not differ between NK4 and mock transfectants,
and this was also the finding in the in vitro assay. However, the NK4-transfected clone showed significant inhibition of tumor progression in both the orthotopic implantation
and liver metastasis models. The number of vessels within tumors was significantly decreased, and the apoptotic tumor cells
were increased in number. The results of these experiments show that genetic modification of tumor cells with NK4 cDNA yields
a significant antitumor effect and that this effect is mainly obtained by NK4’s function as an angiogenesis inhibitor rather
than as an HGF antagonist. We conclude that the potent angiogenesis inhibitor NK4 may be a promising molecule for gene therapy
of pancreatic cancer.