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Baculovirus entry into human hepatoma cells.
Heli Matilainen1, Johanna Rinne, Leona Gilbert
1University of Jyväskylä, Nano Science Center, Department of Biological and Environmental Science, PO Box 35, FIN-40351 Jyväskylä, Finland.
Journal of Virology
|November 25, 2005
Summary
Autographa californica multiple nucleopolyhedrovirus (AcMNPV) enters human cells via clathrin-mediated endocytosis and macropinocytosis. This baculovirus vector research aids gene delivery applications.
Area of Science:
- Molecular Biology
- Virology
- Cell Biology
Background:
- Autographa californica multiple nucleopolyhedrovirus (AcMNPV) is a baculovirus with potential for mammalian gene delivery.
- The entry mechanisms and intracellular transport of AcMNPV in mammalian cells are not well understood.
Purpose of the Study:
- To characterize the entry steps and intracellular trafficking of AcMNPV in human hepatoma cells.
- To investigate the potential of AcMNPV as a gene delivery vector for mammalian cells.
Main Methods:
- Electron microscopy to visualize virion location and cell surface interactions.
- Confocal microscopy and immunoelectron microscopy for tracking virus particles within endosomal compartments.
- Double-labeling experiments to identify specific endosomal markers.
Main Results:
- AcMNPV efficiently binds and transduces human hepatoma cells.
- Virions were observed in clathrin-coated pits, non-coated invaginations, and macropinosomes.
- Virus particles were detected in early and late endosomes, but not in recycling endosomes or the Golgi complex.
Conclusions:
- AcMNPV entry into mammalian cells likely occurs through clathrin-mediated endocytosis and macropinocytosis.
- Understanding these entry pathways is crucial for designing improved baculovirus vectors for gene therapy.