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Am. J. Respir. Cell Mol. Biol., Volume 20, Number 4, April, 1999 825-833

Upregulation of the p75 But Not the p55 TNF-alpha Receptor mRNA after Silica and Bleomycin Exposure and Protection from Lung Injury in Double Receptor Knockout Mice

Luis A. Ortiz, Joseph Lasky, Giuseppe Lungarella, Eleonora Cavarra, Piero Martorana, William A. Banks, Jacques J. Peschon, Hans-Ludwig Schmidts, Arnold R. Brody, and Mitchell Friedman

Section of Pulmonary Diseases, Critical Care and Environmental Medicine, Section of Endocrinology, and Department of Pathology, Tulane University Medical Center, New Orleans, Louisiana; Immunex Corporation, Seattle, Washington; Istituto di Patologia Generale, Universita di Siena, Siena, Italy; and Hoeschst Marion Roussel, Frankfurt, Germany

We have investigated a potential role for tumor necrosis factor (TNF)-alpha and its two receptors (p55 and p75) in lung injury. We used several varieties of mice exposed endotracheally to two fibrogenic agents, silica (0.2 g/kg) and bleomycin (4 U/kg). The lungs were analyzed at 14 and 28 d after exposure to bleomycin or silica, respectively, for TNF and TNF receptor (TNFR) messenger RNA (mRNA), hydroxyproline content, and histopathology. Silica induced increased (over saline-treated animals) expression of TNF mRNA in double TNFR knockout (Ko), C57BL/6, BALB/c, and 129/J mice. In contrast, bleomycin increased expression in all but BALB/c mice, which are resistant to the fibrogenic effects of this drug. mRNA expression of both receptors was constitutively expressed in all of the normal murine strains. Silica upregulated expression of the p75 receptor, but not the p55 receptor, in the C57BL/6, BALB/c, and 129/J mice. In comparison, bleomycin had little effect on either receptor in the bleomycin-resistant BALB/c mice. Hydroxyproline content of the lungs after treatment followed this same pattern, with significant increases caused by silica in the C57BL/6, BALB/c, and 129/J mice, whereas bleomycin caused no apparent increases in the BALB/c mice. Even though silica and bleomycin induced increases in TNF in the TNFR Ko mice, the mice were protected from the fibrogenic effects of these agents. This study supports the concept that TNF is a central mediator of interstitial pulmonary fibrosis.




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