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Journal of Virology, December 2001, p. 12421-12430, Vol. 75, No. 24
Centre d'Immunologie Pierre Fabre, 74164 Saint-Julien-en-Genevois,
France
Received 1 November 1999/Accepted 10 August 2001
A BALB/c mouse model of enhanced pulmonary pathology following
vaccination with formalin-inactivated alum-adsorbed respiratory syncytial virus (FI-RSV) and live RSV challenge was used to determine the type and kinetics of histopathologic lesions induced and chemokine gene expression profiles in lung tissues. These data were compared and
contrasted with data generated following primary and/or secondary RSV
infection or RSV challenge following vaccination with a promising subunit vaccine, BBG2Na. Severe peribronchiolitis and perivascularitis coupled with alveolitis and interstitial inflammation were the hallmarks of lesions in the lungs of FI-RSV-primed mice, with peak
histopathology evident on days 5 and 9. In contrast, primary RSV
infection resulted in no discernible lesions, while challenge of
RSV-primed mice resulted in rare but mild peribronchiolitis and
perivascularitis, with no evidence of alveolitis or interstitial inflammation. Importantly, mice vaccinated with a broad dose range (20 to 0.02 µg) of a clinical formulation of BBG2Na in aluminium phosphate demonstrated histopathology similar to that observed in
secondary RSV infection. At the molecular level, FI-RSV priming was
characterized by a rapid and strong up-regulation of eotaxin and
monocyte chemotactic protein 3 (MCP-3) relative gene expression (potent
lymphocyte and eosinophil chemoattractants) that was sustained through
late time points, early but intermittent up-regulation of GRO/melanoma
growth stimulatory activity gene and inducible protein 10 gene
expression, while macrophage inflammatory protein 2 (MIP-2) and
especially MCP-1 were up-regulated only at late time points. By
comparison, primary RSV infection or BBG2Na priming resulted in
considerably lower eotaxin and MCP-3 gene expression increases
postchallenge, while expression of lymphocyte or monocyte chemoattractant chemokine genes (MIP-1
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.24.12421-12430.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Differential Histopathology and Chemokine Gene
Expression in Lung Tissues following Respiratory Syncytial Virus (RSV)
Challenge of Formalin-Inactivated RSV- or BBG2Na-Immunized
Mice

, MCP-1, and MIP-2)
were of higher magnitude and kinetics at early, but not late, time points. Our combined histopathologic and chemokine gene expression data
provide a basis for differentiating between aberrant
FI-RSV-induced immune responses and normal responses associated with
RSV infection in the mouse model. Consequently, our data suggest that
BBG2Na may constitute a safe RSV subunit vaccine for use in
seronegative infants.
*
Corresponding author. Mailing address: Centre
d'Immunologie Pierre Fabre, 5 av. Napoléon III, 74164 Saint-Julien-en-Genevois, France. Phone: (33)450.35.35.55. Fax:
(33)450.35.35.90. E-mail: ultan.power{at}pierre-fabre.com.
Present address: Transgène S.A., 67082 Strasbourg Cedex, France.
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