GRP78 induction by cyclosporin A in human HeLa cells.
Immunosuppressive drugs such as cyclosporin A (CsA) and FK506 are known to have pleiotropic effects on cells. Here we demonstrate that treatment of HeLa cells with low concentrations of CsA (but not of FK506) induces the synthesis of a stress protein, GRP78, located inside the endoplasmic reticulum. High concentrations of CsA lead to a general decrease in protein synthesis. When cells are stressed (heat-shocked) during the CsA treatment, the synthesis of heat shock proteins is reinforced. FK506 has no detectable effects at any concentration. The mechanism of induction of GRP78 by CsA remains presently unknown. Whatever the mechanism involved, GRP78 overexpression might be responsible for some of the physiological effects of CsA.
Paslaru
L
L
Unité de Génétique moléculaire, Ecole Normale Supérieure, Paris, France.
Pinto
M
M
Morange
M
M
D002352:Carrier Proteins / Q000096:biosynthesis*; D016572:Cyclosporine / Q000494:pharmacology*; D015180:Electrophoresis, Gel, Two-Dimensional; D000091342:Endoplasmic Reticulum Chaperone BiP; D004790:Enzyme Induction / Q000187:drug effects; D006367:HeLa Cells; D006360:Heat-Shock Proteins; D006358:Hot Temperature; D006801:Humans; D007526:Isoelectric Point; D018832:Molecular Chaperones; D008970:Molecular Weight; D016559:Tacrolimus / Q000494:pharmacology
D002352:Carrier Proteins; D000091342:Endoplasmic Reticulum Chaperone BiP; C000717247:HSPA5 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D016572:Cyclosporine; D016559:Tacrolimus