Entry kinetics and cell-cell transmission of surface-bound retroviral vector particles

Lee S. O'Neill, Amy M. Skinner, Josha A. Woodward, Peter Kurre

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Background: Transduction with recombinant HIV-1 derived lentivirus vectors is a multi-step process initiated by surface attachment and subsequent receptor-directed uptake into the target cell. We previously reported the retention of vesicular stomatitis virus G protein pseudotyped particles on murine progenitor cells and their delayed cell-cell transfer. Methods: To examine the underlying mechanism in more detail, we used a combination of approaches focused on investigating the role of receptor-independent factors in modulating attachment. Results: The investigation of synchronized transduction reveals cell-type specific rates of vector particle clearance with substantial delays during particle entry into murine hematopoietic progenitor cells. The observed uptake kinetics from the surface of the 1° cell correlate inversely with the magnitude of transfer to 2° targets, corresponding with our initial observation of preferential cell-cell transfer in the context of brief vector exposures. We further demonstrate that vector particle entry into cells is associated with the cell-type specific abundance of extracellular matrix fibronectin. Residual particle-extracellular fibronectin matrix binding and 2° transfer can be competitively disrupted by heparin exposure without affecting murine progenitor homing and repopulation. Conclusions: Although cellular attachment factors, including fibronectin, aid gene transfer by colocalizing particles to cells and disfavoring early dissociation from targets, they also appear to stabilize particles on the cell surface. The present study highlights the inadvertent consequences for cell entry and cell-cell transfer.

Original languageEnglish (US)
Pages (from-to)463-476
Number of pages14
JournalJournal of Gene Medicine
Issue number5
StatePublished - May 2010
Externally publishedYes


  • Cell-cell transfer
  • Fibronectin matrix
  • HIV-1
  • Lentivirus vector

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Drug Discovery
  • Genetics(clinical)


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