Related Experiment Videos
Highly efficient transduction of repopulating bone marrow cells using rapidly concentrated polymer-complexed
Douglas W McMillin1, Natalia Landázuri, Bagirath Gangadharan
1Department of Pediatrics, Division of Hematology/Oncology and Bone Marrow Transplantation, Emory University School of Medicine, Atlanta, GA 30322, USA.
Biochemical and Biophysical Research Communications
|April 6, 2005
Summary
This study demonstrates a novel polymer-based method to concentrate retroviruses, enhancing gene marking in hematopoietic stem cells. This technique efficiently transduces stem cells, showing stable gene expression post-transplant.
Area of Science:
- Biotechnology
- Gene Therapy
- Virology
Background:
- Recombinant retroviruses are crucial for gene therapy but are often inactivated by high-speed concentration.
- Developing efficient concentration methods for sensitive retroviral vectors is essential for therapeutic applications.
Purpose of the Study:
- To develop and evaluate a novel polymer-based concentration method for recombinant retroviruses.
- To assess the efficiency of polymer-concentrated retroviruses in gene marking of hematopoietic stem cells.
Main Methods:
- Utilized a combination of cationic (Polybrene) and anionic (chondroitin sulfate C) polymers to concentrate retroviruses.
- Transduced murine bone marrow progenitor cells with GFP-encoding retrovirus and transplanted into irradiated recipients.
- Tested a second retroviral vector encoding a drug-resistant dihydrofolate reductase variant (L22Y-DHFR).
Main Results:
- Achieved an average of 30-35% gene marking in mice at 8 weeks post-transplant, with stable transgene expression over 16 weeks.
- Demonstrated that approximately 40% of transduced progenitor cells were protected against trimetrexate.
- Showed efficient transduction of hematopoietic stem cells using polymer-concentrated retroviruses.
Conclusions:
- Anionic and cationic polymers can be effectively combined to rapidly concentrate sensitive retroviruses.
- This polymer concentration method offers an efficient way to transduce hematopoietic stem cells for gene therapy applications.