한빛사 논문
Shinrye Leea, Yu-Mi Jeona, Sun Joo Chab, Seyeon Kima,c, Younghwi Kwona,c, Myungjin Joa, You-Na Jangd, Seongsoo Leee, Jaekwang Kima, Sang Ryong Kimf,g, Kea Joo Leed, Sung Bae Leec, Kiyoung Kimb,h,*, and Hyung-Jun Kima,*
aDementia Research Group, Korea Brain Research Institute (KBRI), Daegu, South Korea; bSoonchunhyang Institute of Medi-bio Science, Soonchunhyang University, Cheonan, South Korea; cDepartment of Brain & Cognitive Sciences, DGIST, Daegu, South Korea; dNeural circuits
Research Group, Korea Brain Research Institute (KBRI), Daegu, South Korea; eGwangju Center, Korea Basic Science Institute (KBSI), Gwangju, South Korea; fSchool of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Institute of Life Science & Biotechnology, Kyungpook National
University, Daegu, South Korea; gBrain Science and Engineering Institute, Kyungpook National University, Daegu, South Korea; hDepartment of Medical Biotechnology, Soonchunhyang University, Asan, South Korea
*CONTACT to
Hyung-Jun Kim, Dementia Research Group, Korea Brain Research Institute (KBRI), Daegu, South Korea;
Kiyoung Kim, Department of Medical Biotechnology, Soonchunhyang University, Asan, South Korea
Abstract
TARDBP/TDP-43 (TAR DNA binding protein) proteinopathies are a common feature in a variety of neurodegenerative disorders, including amyotrophic lateral sclerosis (ALS), frontotemporal lobar degeneration (FTLD), and Alzheimer disease (AD). However, the molecular mechanisms underlying TARDBP-induced neurotoxicity are largely unknown. In this study, we demonstrated that TARDBP proteinopathies induce impairment in the ubiquitin proteasome system (UPS), as evidenced by an accumulation of ubiquitinated proteins and a reduction in proteasome activity in neuronal cells. Through kinase inhibitor screening, we identified PTK2/FAK (PTK2 protein tyrosine kinase 2) as a suppressor of neurotoxicity induced by UPS impairment. Importantly, PTK2 inhibition significantly reduced ubiquitin aggregates and attenuated TARDBP-induced cytotoxicity in a Drosophila model of TARDBP proteinopathies. We further identified that phosphorylation of SQSTM1/p62 (sequestosome 1) at S403 (p-SQSTM1 [S403]), a key component in the autophagic degradation of poly-ubiquitinated proteins, is increased upon TARDBP overexpression and is dependent on the activation of PTK2 in neuronal cells. Moreover, expressing a non-phosphorylated form of SQSTM1 (SQSTM1S403A) significantly repressed the accumulation of insoluble poly-ubiquitinated proteins and neurotoxicity induced by TARDBP overexpression in neuronal cells. In addition, TBK1 (TANK binding kinase 1), a kinase that phosphorylates S403 of SQSTM1, was found to be involved in the PTK2-mediated phosphorylation of SQSTM1. Taken together, our data suggest that the PTK2-TBK1-SQSTM1 axis plays a critical role in the pathogenesis of TARDBP by regulating neurotoxicity induced by UPS impairment. Therefore, targeting the PTK2-TBK1-SQSTM1 axis may represent a novel therapeutic intervention for neurodegenerative diseases with TARDBP proteinopathies.Abbreviations: ALP: macroautophagy/autophagy lysosomal pathway; ALS: amyotrophic lateral sclerosis; ATXN2: ataxin 2; BafA1: bafilomycin A1; cCASP3: cleaved caspase 3; CSNK2: casein kinase 2; FTLD: frontotemporal lobar degeneration; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; OPTN: optineurin; PTK2/FAK: PTK2 protein tyrosine kinase 2; SQSTM1/p62: sequestosome 1; TARDBP/TDP-43: TAR DNA binding protein; TBK1: TANK binding kinase 1; ULK1: unc-51 like autophagy activating kinase 1; UPS: ubiquitin-proteasome system.
KEYWORDS: Amyotrophic lateral sclerosis, PTK2/FAK, SQSTM1/p62, TARDBP/TDP-43, ubiquitin-proteasome system
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