title: Glycogen synthase kinase-3beta induces neuronal cell death via direct phosphorylation of mixed lineage kinase 3.
abstract: Mixed lineage kinase 3 (MLK3) is a mitogen-activated protein kinase kinase kinase member that activates the c-Jun N-terminal kinase (JNK) pathway. Aberrant activation of MLK3 has been implicated in neurodegenerative diseases. Similarly, glycogen synthase kinase (GSK)-3beta has also been shown to activate JNK and contribute to neuronal apoptosis. Here, we show a functional interaction between MLK3 and GSK-3beta during nerve growth factor (NGF) withdrawal-induced cell death in PC-12 cells. The protein kinase activities of GSK-3beta, MLK3, and JNK were increased upon NGF withdrawal, which paralleled increased cell death in NGF-deprived PC-12 cells. NGF withdrawal-induced cell death and MLK3 activation were blocked by a GSK-3beta-selective inhibitor, kenpaullone. However, the MLK family inhibitor, CEP-11004, although preventing PC-12 cell death, failed to inhibit GSK-3beta activation, indicating that induction of GSK-3beta lies upstream of MLK3. In GSK-3beta-deficient murine embryonic fibroblasts, ultraviolet light was unable to activate MLK3 kinase activity, a defect that was restored upon ectopic expression of GSK-3beta. The activation of MLK3 by GSK-3beta occurred via phosphorylation of MLK3 on two amino acid residues, Ser(789) and Ser(793), that are located within the C-terminal regulatory domain of MLK3. Furthermore, the cell death induced by GSK-3beta was mediated by MLK3 in a manner dependent on its phosphorylation of the specific residues within the C-terminal domain by GSK-3beta. Taken together, our data provide a direct link between GSK-3beta and MLK3 activation in a neuronal cell death pathway and identify MLK3 as a direct downstream target of GSK-3beta. Inhibition of GSK-3 is thus a potential therapeutic strategy for neurodegenerative diseases caused by trophic factor deprivation.
authors: Department of Internal Medicine, Cardiovascular and Cancer Research Institute, The Texas A & M University System-HSC, College of Medicine, Texas 76504, USA.
authors: Rajakishore
authors: R
authors: Mishra
authors: Manoj K
authors: MK
authors: Barthwal
authors: Gautam
authors: G
authors: Sondarva
authors: Basabi
authors: B
authors: Rana
authors: Lucas
authors: L
authors: Wong
authors: Malay
authors: M
authors: Chatterjee
authors: James R
authors: JR
authors: Woodgett
authors: Ajay
authors: A
authors: Rana
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D002227:Carbazoles / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D004622:Embryo, Mammalian / Q000201:enzymology / Q000473:pathology; D004789:Enzyme Activation / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D005347:Fibroblasts / Q000201:enzymology / Q000473:pathology; D038362:Glycogen Synthase Kinase 3 / Q000235:genetics / Q000378:metabolism*; D000071679:Glycogen Synthase Kinase 3 beta; D006801:Humans; D007211:Indoles / Q000494:pharmacology; D048670:MAP Kinase Kinase 4 / Q000235:genetics / Q000378:metabolism; D020930:MAP Kinase Kinase Kinases / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D020932:Nerve Growth Factor / Q000378:metabolism / Q000494:pharmacology; D019636:Neurodegenerative Diseases / Q000188:drug therapy / Q000201:enzymology / Q000473:pathology; D009474:Neurons / Q000201:enzymology* / Q000473:pathology; D016716:PC12 Cells; D010766:Phosphorylation / Q000187:drug effects / Q000528:radiation effects; D051381:Rats; D014466:Ultraviolet Rays; D000097767:Mitogen-Activated Protein Kinase Kinase Kinase 11
chemical_list: D002227:Carbazoles; D038362:Glycogen Synthase Kinase 3; D000071679:Glycogen Synthase Kinase 3 beta; D007211:Indoles; D048670:MAP Kinase Kinase 4; D020930:MAP Kinase Kinase Kinases; D020932:Nerve Growth Factor; D000097767:Mitogen-Activated Protein Kinase Kinase Kinase 11; C469298:CEP-11004; C000605506:GSK3B protein, human; C000605507:Gsk3b protein, mouse; C000605508:Gsk3b protein, rat
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