title: Okadaic acid induces cellular hypertrophy in AKR-2B fibroblasts: involvement of the p70S6 kinase in the onset of protein and rRNA synthesis.
abstract: At low concentrations (50 nM), okadaic acid (OA), an inhibitor of phosphatases 1 and 2A, inhibits platelet-derived growth factor-induced cell proliferation in late G1 (A. Simm et al., Exp. Cell Res., 210: 160-165, 1994). This inhibition is caused by the interference of OA in the induction and activation of the cell division protein kinases cdk1 and cdk2. OA alone has no effect on cell number, but induces a pronounced increase in cell size. The OA-induced hypertrophy can be divided into two phases. The first phase is characterized by a swelling of the cells. This increase in cellular volume is not accompanied by a change in the level of cellular macromolecules, i.e., protein and RNA. Inhibitor studies indicated a possible role of the Na+/H+ antiporter and Cl- channels in this process. In the second phase, an increase in the cellular protein and RNA content was observed along with a minor change in cell volume. To delineate a possible signaling pathway, the involvement of numerous protein kinases was analyzed. Low concentrations of OA lead to pronounced and sustained activation of the p70S6 kinase. There was little or no effect on various other kinases that can be activated by extracellular signals, e.g., mitogen-activated kinase, ribosomal S6 kinase, or other S6 peptide kinases. Likewise, at these concentrations, OA did not activate the genes for fos, myc, or ornithine decarboxylase. At very low concentrations (ED50, 0.5 nM), rapamycin, a specific inhibitor of the activation of p70S6 kinase, reversed the activation of the p70S6 kinase and the enhancement of RNA synthesis and partially the increase in cell volume and protein synthesis. The OA-induced hypertrophy of AKR-2B fibroblasts may serve as a model system for investigations aimed at the identification of signaling pathways leading to hypertrophy of differentiated nonproliferating cells.
authors.affiliation: Theodor-Boveri-Institut für Biowissenschaften (Biozentrum), Universität, Würzburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Leicht
authors.forename: A
authors.initials: A
authors.lastname: Simm
authors.forename: G
authors.initials: G
authors.lastname: Bertsch
authors.forename: J
authors.initials: J
authors.lastname: Hoppe
mesh_terms: D000227:Adenine Nucleotides / Q000096:biosynthesis; D000584:Amiloride / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D000077214:Becaplermin; D016203:CDC2 Protein Kinase / Q000378:metabolism; D042846:CDC2-CDC28 Kinases; D002460:Cell Line; D048429:Cell Size; D018118:Chloride Channels / Q000037:antagonists & inhibitors / Q000502:physiology; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases / Q000378:metabolism; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005347:Fibroblasts / Q000166:cytology / Q000201:enzymology / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006160:Guanosine Triphosphate / Q000096:biosynthesis; D051379:Mice; D008806:Mice, Inbred AKR; D009579:Nitrobenzoates / Q000494:pharmacology; D019319:Okadaic Acid / Q000494:pharmacology*; D010749:Phosphoprotein Phosphatases / Q000037:antagonists & inhibitors*; D010766:Phosphorylation; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology; D011090:Polyenes / Q000494:pharmacology; D014176:Protein Biosynthesis; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism; D020574:Proto-Oncogene Proteins c-sis; D012335:RNA, Ribosomal / Q000096:biosynthesis* / Q000378:metabolism; D019893:Ribosomal Protein S6 Kinases; D015398:Signal Transduction / Q000502:physiology; D020123:Sirolimus; D017923:Sodium-Hydrogen Exchangers / Q000037:antagonists & inhibitors / Q000502:physiology
chemical_list: D000227:Adenine Nucleotides; D018118:Chloride Channels; D004791:Enzyme Inhibitors; D009579:Nitrobenzoates; D010982:Platelet-Derived Growth Factor; D011090:Polyenes; D011506:Proteins; D020574:Proto-Oncogene Proteins c-sis; D012335:RNA, Ribosomal; D017923:Sodium-Hydrogen Exchangers; D000077214:Becaplermin; D019319:Okadaic Acid; C058176:5-nitro-2-(3-phenylpropylamino)benzoic acid; D000584:Amiloride; D006160:Guanosine Triphosphate; D017346:Protein Serine-Threonine Kinases; D019893:Ribosomal Protein S6 Kinases; D016203:CDC2 Protein Kinase; D042846:CDC2-CDC28 Kinases; C495893:Cdk2 protein, mouse; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases; D010749:Phosphoprotein Phosphatases; C039614:ethylisopropylamiloride; D020123:Sirolimus