title: Bone marrow transplantation reveals the in vivo expression of the mitochondrial uncoupling protein 2 in immune and nonimmune cells during inflammation.
abstract: The mitochondrial uncoupling protein 2 (UCP2) is expressed in spleen, lung, intestine, white adipose tissue, and immune cells. Bone marrow transplantation in mice was used to assess the contribution of immune cells to the expression of UCP2 in basal condition and during inflammation. Immune cells accounted for the total amount of UCP2 expression in the spleen, one-third of its expression in the lung, and did not participate in its expression in the intestine. LPS injection stimulated UCP2 expression in lung, spleen, and intestine in both immune and non-immune cells. Successive injections of LPS and dexamethasone or N-acetyl-cysteine prevented the induction of UCP2 in all three tissues, suggesting that oxygen free radical generation plays a role in UCP2 regulation. Finally, both previous studies and our data show that there is down-regulation of UCP2 in immune cells during their activation in the early stages of the LPS response followed by an up-regulation in UCP2 during the later stages to protect all cells against oxidative stress.
authors.affiliation: CNRS UPR 9078, Faculté de Médecine Necker-Enfants Malades, 156 rue de Vaugirard, 75730 Paris Cedex 15, France.
authors.forename: Marie-Clotilde
authors.initials: MC
authors.lastname: Alves-Guerra
authors.forename: Sophie
authors.initials: S
authors.lastname: Rousset
authors.forename: Claire
authors.initials: C
authors.lastname: Pecqueur
authors.forename: Ziad
authors.initials: Z
authors.lastname: Mallat
authors.forename: Julie
authors.initials: J
authors.lastname: Blanc
authors.forename: Alain
authors.initials: A
authors.lastname: Tedgui
authors.forename: Fredéric
authors.initials: F
authors.lastname: Bouillaud
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Cassard-Doulcier
authors.forename: Daniel
authors.initials: D
authors.lastname: Ricquier
authors.forename: Bruno
authors.initials: B
authors.lastname: Miroux
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D016026:Bone Marrow Transplantation; D002352:Carrier Proteins / Q000096:biosynthesis / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology; D005609:Free Radicals / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D007107:Immune System / Q000166:cytology*; D007422:Intestines; D007473:Ion Channels; D008070:Lipopolysaccharides / Q000494:pharmacology; D008168:Lung; D026901:Membrane Transport Proteins / Q000096:biosynthesis / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D024101:Mitochondrial Proteins / Q000096:biosynthesis / Q000378:metabolism*; D009928:Organ Specificity; D013154:Spleen; D014018:Tissue Distribution; D000071246:Uncoupling Protein 2
chemical_list: D002352:Carrier Proteins; D005609:Free Radicals; D007473:Ion Channels; D008070:Lipopolysaccharides; D026901:Membrane Transport Proteins; D024101:Mitochondrial Proteins; C000604390:Ucp2 protein, mouse; D000071246:Uncoupling Protein 2; D003907:Dexamethasone; D000111:Acetylcysteine