ALS-linked mutant SOD1 induces ER stress- and ASK1-dependent motor neuron death by targeting Derlin-1.
Mutation in Cu/Zn-superoxide dismutase (SOD1) is a cause of familial amyotrophic lateral sclerosis (ALS). Mutant SOD1 protein (SOD1(mut)) induces motor neuron death, although the molecular mechanism of SOD1(mut)-induced cell death remains controversial. Here we show that SOD1(mut) specifically interacted with Derlin-1, a component of endoplasmic reticulum (ER)-associated degradation (ERAD) machinery and triggered ER stress through dysfunction of ERAD. SOD1(mut)-induced ER stress activated the apoptosis signal-regulating kinase 1 (ASK1)-dependent cell death pathway. Perturbation of binding between SOD1(mut) and Derlin-1 by Derlin-1-derived oligopeptide suppressed SOD1(mut)-induced ER stress, ASK1 activation, and motor neuron death. Moreover, deletion of ASK1 mitigated the motor neuron loss and extended the life span of SOD1(mut) transgenic mice. These findings demonstrate that ER stress-induced ASK1 activation, which is triggered by the specific interaction of Derlin-1 with SOD1(mut), is crucial for disease progression of familial ALS.
Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation, Bunkyo-ku, Tokyo 113-0033, Japan;
Hideki
H
Nishitoh
Hisae
H
Kadowaki
Atsushi
A
Nagai
Takeshi
T
Maruyama
Takanori
T
Yokota
Hisashi
H
Fukutomi
Takuya
T
Noguchi
Atsushi
A
Matsuzawa
Kohsuke
K
Takeda
Hidenori
H
Ichijo
D000690:Amyotrophic Lateral Sclerosis / Q000235:genetics* / Q000473:pathology*; D000818:Animals; D016923:Cell Death; D002460:Cell Line; D004721:Endoplasmic Reticulum / Q000473:pathology*; D004789:Enzyme Activation; D005786:Gene Expression Regulation; D006801:Humans; D048848:MAP Kinase Kinase Kinase 5 / Q000378:metabolism*; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D009046:Motor Neurons / Q000473:pathology*; D009154:Mutation; D015398:Signal Transduction; D013482:Superoxide Dismutase / Q000235:genetics*
D008565:Membrane Proteins; C530424:derlin-1 protein, mouse; D013482:Superoxide Dismutase; D048848:MAP Kinase Kinase Kinase 5