Recombinant adeno-associated virus (rAAV) expressing TFPI-2 inhibits invasion, angiogenesis and tumor growth in a human glioblastoma cell line.
Recombinant adeno-associated viruses (rAAV) have become the vector of choice for many gene therapy protocols. rAAVs have a number of attractive features including long-term transgene expression and the ability to transduce both dividing and non-dividing cells. We have shown previously the anti-cancer role of tissue factor pathway inhibitor-2 (TFPI-2), a matrix-associated serine protease inhibitor, in human glioblastomas. As a result of our present study, in which 0.8-kb fragment of human TFPI-2 was cloned into the adeno-associated viral vectors (rAAA-TFPI-2), rAAV-TFPI-2 infection of SNB19 cells significantly increased TFPI-2 as determined by Western blotting. As assessed by spheroid and Matrigel assays, infection of SNB19 cells with rAAV-TFPI-2 significantly reduced migration and invasion in a dose-dependent manner. Tumor spheroids infected with rAAV-TFPI-2 and co-cultured with fetal rat brain aggregates did not invade rat brain aggregates, whereas 90-95% of the mock and AAV-CMV infected cells invaded rat brain aggregates. In vitro angiogenesis studies (tumor cells co-cultured with endothelial cells or endothelial cells seeded on matrigel) showed reduction of capillary-like structure formation in rAAV-TFPI-2-treated cells as compared to parental and mock-transfected cells. In in vivo angiogenesis results demonstrated the formation of microvessels in SNB19 parental cells and this formation was inhibited when the SNB19 cells were infected with rAAV-TFPI-2. Further, we observed a large reduction of tumor growth in SNB19 cells treated with rAAV-TFPI-2 virus injected intracerebrally when compared to controls. Our study demonstrates that rAAV-TFPI-2-mediated gene therapy offers a novel tool for the treatment of brain tumors.
Yanamandra
Niranjan
N
Program of Cancer Biology, Department of Biomedical and Therapeutic Sciences, University of Illinois College of Medicine, Peoria, IL 61656, USA.
Kondraganti
Shakuntala
S
Gondi
Christopher S
CS
Gujrati
Meena
M
Olivero
William C
WC
Dinh
Dzung H
DH
Rao
Jasti S
JS
D000818:Animals; D002465:Cell Movement; D049109:Cell Proliferation; D000229:Dependovirus / Q000235:genetics*; D005822:Genetic Vectors; D005909:Glioblastoma; D006023:Glycoproteins / Q000235:genetics / Q000502:physiology*; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D009389:Neovascularization, Pathologic / Q000235:genetics*; D014407:Tumor Cells, Cultured
D006023:Glycoproteins; C021240:tissue-factor-pathway inhibitor 2