title: Modulation of hyperoxia-induced TNF-alpha expression in the newborn rat lung by thalidomide and dexamethasone.
abstract: The effect of high oxygen concentrations on lungs of neonatal rats was studied. In addition, some oxygen-exposed animals were treated with either dexamethasone or thalidomide. No gross histologic changes were noted in the lungs following exposure to 95% oxygen nor were there changes in the total number or the phenotypic distribution of BAL cells obtained from these lungs compared to lungs from air exposed (control) neonatal rats. The majority of the BAL cells were CD45+ leukocytes (macrophages). However, when BAL cells were exposed to LPS in vitro, TNF-alpha production was higher in cells from rats exposed to 95% oxygen compared to cells from rats exposed to ambient air. In addition, lung TNF-alpha and IL-6 mRNA levels were increased after exposure to 95% oxygen. In the lungs of animals treated with either dexamethasone or thalidomide, TNF-alpha mRNA levels were reduced, while only dexamethasone treatment also reduced IL-6 mRNA levels.
authors.affiliation: Department of Neonatology, New York Hospital-Cornell Medical Center, New York 10021, USA.
authors.forename: L
authors.initials: L
authors.lastname: Lindsay
authors.forename: S J
authors.initials: SJ
authors.lastname: Oliver
authors.forename: S L
authors.initials: SL
authors.lastname: Freeman
authors.forename: R
authors.initials: R
authors.lastname: Josien
authors.forename: A
authors.initials: A
authors.lastname: Krauss
authors.forename: G
authors.initials: G
authors.lastname: Kaplan
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology; D003907:Dexamethasone / Q000494:pharmacology*; D004195:Disease Models, Animal; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D018496:Hyperoxia / Q000188:drug therapy* / Q000235:genetics* / Q000378:metabolism; D007166:Immunosuppressive Agents / Q000494:pharmacology; D066298:In Vitro Techniques; D015850:Interleukin-6 / Q000235:genetics; D008168:Lung / Q000187:drug effects* / Q000378:metabolism*; D055370:Lung Injury; D016676:Macrophages, Alveolar / Q000378:metabolism; D011247:Pregnancy; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D013792:Thalidomide / Q000494:pharmacology*; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
chemical_list: D007166:Immunosuppressive Agents; D015850:Interleukin-6; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D013792:Thalidomide; D003907:Dexamethasone