Recombinant adeno-associated virus 2-mediated antiangiogenic prevention in a mouse model of intraperitoneal ovarian cancer.
OBJECTIVE
In the present study, we sought to determine the potential of sustained transgene expression by a single i.m. administration of recombinant adeno-associated virus 2 (rAAV) encoding angiostatin and endostatin in inhibiting i.p. ovarian cancer growth and dissemination in a preclinical mouse model.


METHODS
Cohorts of female athymic nude mice received either no virus or 1.2 x 10(11) particles of rAAV encoding green fluorescence protein or endostatin plus angiostatin, i.m. Three weeks later, the mice were i.p. injected with 10(6) human epithelial ovarian cancer cell line SKOV3.ip1. As a measure of effectiveness of the therapy, tumor weight, abdominal distension, ascites volume and vascular endothelial growth factor level, and tumor weight were determined. Immunohistochemistry was done to determine tumor cell apoptosis and endothelial cell proliferation following the therapy. Tumor-free survival was recorded as the end point.


RESULTS
Results indicated a significant tumor-free survival (P < 0.003) following therapy with rAAV encoding endostatin and angiostatin compared with untreated or rAAV-green fluorescence protein-treated mice. Ascites volume in rAAV endostatin and angiostatin-treated mice was significantly lower than naive mice and contained less hemorrhage and tumor conglomerates. The level of vascular endothelial growth factor in the ascites of antiangiogenic vector treated mice was also significantly less compared with the untreated mice. Immunohistochemical analyses indicated increased tumor cell apoptosis and decreased blood vasculature following rAAV endostatin and angiostatin treatment.


CONCLUSIONS
The results indicate that antiangiogenic genetic prevention from stable systemic levels of angiostatin and endostatin by i.m. administration of rAAV can be used for the treatment of i.p. ovarian cancer growth and dissemination.
Isayeva
Tatyana
T
Department of Pathology, University of Alabama at Birmingham, 19th Street South, Birmingham, AL 35294-0007, USA.
Ren
Changchun
C
Ponnazhagan
Selvarangan
S
D020533:Angiogenesis Inhibitors / Q000235:genetics / Q000502:physiology*; D043168:Angiostatins / Q000235:genetics / Q000502:physiology; D000818:Animals; D017209:Apoptosis; D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D000229:Dependovirus / Q000235:genetics*; D004195:Disease Models, Animal; D043169:Endostatins / Q000235:genetics / Q000502:physiology; D005260:Female; D015316:Genetic Therapy / Q000379:methods; D005822:Genetic Vectors / Q000235:genetics; D006801:Humans; D007274:Injections, Intraperitoneal; D019394:Ki-67 Antigen / Q000032:analysis; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation / Q000379:methods; D010051:Ovarian Neoplasms / Q000235:genetics / Q000473:pathology / Q000628:therapy*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000502:physiology; D016019:Survival Analysis; D042461:Vascular Endothelial Growth Factor A / Q000032:analysis; D023041:Xenograft Model Antitumor Assays / Q000379:methods
D020533:Angiogenesis Inhibitors; D043169:Endostatins; D019394:Ki-67 Antigen; D011993:Recombinant Fusion Proteins; D042461:Vascular Endothelial Growth Factor A; D043168:Angiostatins