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Published ahead of print on September 11, 2003, doi:10.1165/rcmb.2003-0062OC
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American Journal of Respiratory Cell and Molecular Biology. Vol. 30, pp. 438-448, 2004
© 2004 American Thoracic Society
DOI: 10.1165/rcmb.2003-0062OC

Lymphoid Tissue and Emphysema in the Lungs of Transgenic Mice Inducibly Expressing Tumor Necrosis Factor-{alpha}

Brian R. Vuillemenot, Juan F. Rodriguez and Gary W. Hoyle

Department of Medicine, Tulane University Health Sciences Center, New Orleans, Louisiana

Address correspondence to: Gary W. Hoyle, Ph.D., Section of Pulmonary Diseases, Critical Care and Environmental Medicine, SL-9, 1430 Tulane Ave., New Orleans, LA 70112. E-mail: ghoyle{at}tulane.edu

To develop a model in which the pathogenic effects of the proinflammatory cytokine tumor necrosis factor-{alpha} (TNF) could be investigated, transgenic mice that express TNF in the lung under the control of a doxycycline-inducible promoter were generated. TNF transgene message was expressed at a low level in the absence of doxycycline treatment and was induced in the lung by administration of the drug. Analysis of lung lavage fluid indicated increases in neutrophils and lymphocytes in doxycycline-treated transgenic mice. Histologic analysis of lungs from adult transgenic mice treated with doxycycline revealed prominent development of lymphoid tissue and increases in airspace size. Genes upregulated in TNF transgenic mice, as identified by oligonucleotide microarray analysis, included a variety of transcripts expressed in lymphoid tissues. Immunohistochemical analysis demonstrated the presence of B lymphocytes and, to a lesser extent, T lymphocytes within lymphoid aggregates in TNF transgenic mice. CD8-positive T cells were absent from lymphocytic nodules, but in the lung parenchyma were more abundant in transgenic than in nontransgenic mice. These results indicate that induction of TNF in adult lung promotes the formation of lymphoid tissue and emphysema, and provides a model in which the pathogenic effects of TNF on the lung can be investigated.

Abbreviations: doxycycline, dox • mean linear intercept, Lm • reverse tetracycline transactivator, rtTA • surfactant protein C, SPC • tumor necrosis factor-{alpha}, TNF




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