Tumor necrosis factor-alpha induces the phosphorylation of 28kDa stress proteins in endothelial cells: possible role in protection against cytotoxicity?
Tumor necrosis factor-alpha has been shown to rapidly increase the phosphorylation of three 28 kDa proteins in bovine aortic endothelial cells but not in L929 cells. Tumor necrosis factor-alpha induces the necrosis of the latter cells but not of the former. Arsenite enhanced the phosphorylation of the same 28kDa proteins as tumor necrosis factor-alpha in the endothelial cells. As stress proteins often play a protective role, we suggest that the phosphorylation of these proteins in endothelial cells may be responsible for the resistance of these cells to tumor necrosis factor-alpha.
Robaye
B
B
Institute of Interdisciplinary Research, School of Medicine, Université Libre de Bruxelles, Campus Erasme, Belgium.
Hepburn
A
A
Lecocq
R
R
Fiers
W
W
Boeynaems
J M
JM
Dumont
J E
JE
D000818:Animals; D001151:Arsenic / Q000494:pharmacology; D018053:Arsenites; D002417:Cattle; D015180:Electrophoresis, Gel, Two-Dimensional; D004730:Endothelium, Vascular / Q000187:drug effects / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000378:metabolism*; D066298:In Vitro Techniques; D007295:Inositol Phosphates / Q000378:metabolism; D007526:Isoelectric Point; D008970:Molecular Weight; D010750:Phosphoproteins / Q000378:metabolism; D010766:Phosphorylation; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
D018053:Arsenites; D006360:Heat-Shock Proteins; D007295:Inositol Phosphates; D010750:Phosphoproteins; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha; C015001:arsenite; D001151:Arsenic