Bone marrow transplantation reveals the in vivo expression of the mitochondrial uncoupling protein 2 in immune and nonimmune cells during inflammation.
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.
Alves-Guerra
Marie-Clotilde
MC
CNRS UPR 9078, Faculté de Médecine Necker-Enfants Malades, 156 rue de Vaugirard, 75730 Paris Cedex 15, France.
Rousset
Sophie
S
Pecqueur
Claire
C
Mallat
Ziad
Z
Blanc
Julie
J
Tedgui
Alain
A
Bouillaud
Fredéric
F
Cassard-Doulcier
Anne-Marie
AM
Ricquier
Daniel
D
Miroux
Bruno
B
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
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