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Journal of Virology, November 1998, p. 8861-8872, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Effect of Host Modification and Age on Airway Epithelial Gene Transfer Mediated by a Murine Leukemia Virus-Derived Vector

Larry G. Johnson,1,* Jennifer P. Mewshaw,1 Hong Ni,1 Theodore Friedmann,2 Richard C. Boucher,1 and John C. Olsen1

Cystic Fibrosis/Pulmonary Research and Treatment Center and Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina,1 and Center for Molecular Genetics and Department of Pediatrics, University of California---San Diego, San Diego, California2

Received 24 November 1997/Accepted 14 July 1998

To study retroviral gene transfer to airway epithelia, we used a transient transfection technique to generate high titers (~109 infectious units/ml after concentration) of murine leukemia virus (MuLV)-derived vectors pseudotyped with the vesicular stomatitis virus envelope glycoprotein (VSV-G). Transformed (CFT1) and primary airway epithelial cells were efficiently transduced by a VSV-G-pseudotyped lacZ vector (HIT-LZ) in vitro. CFT1 cells and primary cystic fibrosis (CF) airway cell monolayers infected with a vector (HIT-LCFSN) containing human CF transmembrane conductance regulator (CFTR) in the absence of selection expressed CFTR, as assessed by Western blot analysis, and exhibited functional correction of CFTR-mediated Cl- secretion. In vitro studies of persistence suggested that pseudotransduction was not a significant problem with our vector preparations. In a sulfur dioxide (SO2) inhalational injury model, bromodeoxyuridine (BrdU) incorporation rates were measured and found to exceed 50% in SO2-injured murine tracheal epithelium. HIT-LZ vector (multiplicity of infection of ~10) instilled into the SO2-injured tracheas of anesthetized mice transduced 6.1% ± 1.3% of superficial airway cells in tracheas of weanling mice (3 to 4 weeks old; n = 10), compared to 1.4 ± 0.9% in mice 5 weeks of age (n = 4) and 0.2% in mice older than 6 weeks (n = 15). No evidence for gene transfer following delivery of HIT-LZ to tracheas of either weanling or older mice not injured with SO2 was detected. Because only a small fraction of BrdU-labeled airway cells were transduced, we examined the stability of the vector. No significant loss of vector infectivity over intervals (2 h) paralleling those of in vivo protocols was detected in in vitro assays using CFT1 cells. In summary, high-titer vectors permitted complementation of defective CFTR-mediated Cl- transport in CF airway cells in vitro without selection and demonstrated that the age of the animal appeared to be a major factor affecting in vivo retroviral transduction efficiency.

* Corresponding author. Mailing address: Cystic Fibrosis/Pulmonary Research and Treatment Center, CB 7248, 7123A Thurston Bowles Bldg., University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7248. Phone: (919) 966-7052. Fax: (919) 966-7524. E-mail: gdoc{at}med.unc.edu.

Journal of Virology, November 1998, p. 8861-8872, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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