Title page for ETD etd-12232010-124413

Type of Document Master's Thesis
Author's Email Address vrushali@vt.edu
URN etd-12232010-124413
Title Virus-Based Nanoparticles for Tumor Selective Targeting and Oncolysis
Degree Master of Science
Department Veterinary Medical Sciences
Advisory Committee
Advisor Name Title
Subbiah, Elankumaran Committee Chair
Huckle, William R. Committee Member
Meng, Xiang-Jin Committee Member
  • virotherapy
  • Newcastle disease virus
  • cancer virotherapy
  • nanoparticles
  • virus-based nanoparticles
Date of Defense 2010-12-08
Availability unrestricted
Many oncolytic virotherapies have shown great advantages for rapid, rational design through recombinant DNA technology to facilitate the targeting of a broad spectrum of malignancies. Newcastle disease virus (NDV), an avian paramyxovirus, is naturally tumor-selective and inherently oncolytic. Our approach is to develop NDV-based nanoparticles (VBNP) for oncolytic virotherapy. VBNPs are non-infectious and non-replicating and are relatively safe. We obtained VBNPs by co-expressing matrix (M), hemagglutinin (HN), and fusion (F) proteins of NDV in avian/ mammalian cells. The budding characteristics, size and morphology of VBNPs were similar to authentic virions. As a proof of concept, we engineered the apoptin (VP3) gene of chicken anemia virus in VBNPs and specifically targeted them to folate-receptor bearing tumor cells by surface conjugation to folate. The VBNPs killed tumor cells by apoptosis and induced proinflammatory and chemotactic cytokines. The VBNPs, although not curative, were able to limit the progression of xenotransplanted fibrosarcoma and malignant glioma tumors and provided a survival advantage in nude mice. We also engineered NDV M based particles with nipah virus surface glycorporteins to target ephrin B receptors. NDV based nipah Virus BNPs (NiV-ndBNP) were morphologically similar to authentic NiV virions. NiV glycoproteins were incorporated into the NDV M based particles, despite poor sequence homology in the transmembrane domain and cytoplasmic tails of glycoproteins. Our results suggest that VBNPs could be used to deliver small molecules, tumor antigens, anti-tumor/ reporter genes and also aid in generating tumor specific immunity by rational design.
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