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Hum Gene Ther. 2002 Aug 10;13(12):1415-25.

Intranasal gene transfer by chitosan-DNA nanospheres protects BALB/c mice against acute respiratory syncytial virus infection.

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Division of Allergy and Immunology-Joy McCann Culverhouse Airway Disease Center, James A. Haley Veterans Administration Hospital and University of South Florida College of Medicine, Tampa, FL 33612, USA.


Respiratory syncytial virus (RSV) infection is often associated in infancy with life-threatening bronchiolitis, which is also a major risk factor for the development of asthma. At present, no effective prophylaxis is available against RSV infection. Herein, we describe an effective prophylactic intranasal gene transfer strategy utilizing chitosan-DNA nanospheres (IGT), containing a cocktail of plasmid DNAs encoding all RSV antigens, except L. A single administration of IGT (25 microg/mouse) induces expression of the mRNA and proteins of all antigens in the lung and results in a significant reduction of viral titers and viral antigen load after acute RSV infection of these mice. IGT-administered mice show no significant change in airway reactivity to methacholine and no apparent pulmonary inflammation. Furthermore, IGT results in significant induction of RSV-specific IgG antibodies, nasal IgA antibodies, cytotoxic T lymphocytes, and interferon-gamma production in the lung and splenocytes compared with controls. Together, these results demonstrate the potential of IGT against acute RSV infection.

[Indexed for MEDLINE]

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